Restoring authorship annotation for Andrey Khalyavin <halyavin@gmail.com>. Commit 2 of 2.

1 files changed, 2997 insertions, 2997 deletions

diff --git a/contrib/libs/cxxsupp/libcxx/include/filesystem b/contrib/libs/cxxsupp/libcxx/include/filesystem
index fbe4f51d04..f503343f87 100644
--- a/contrib/libs/cxxsupp/libcxx/include/filesystem
+++ b/contrib/libs/cxxsupp/libcxx/include/filesystem
@@ -1,1489 +1,1489 @@
-// -*- C++ -*- 
-//===--------------------------- filesystem -------------------------------===// 
-// 
+// -*- C++ -*-
+//===--------------------------- filesystem -------------------------------===//
+//
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-// 
-//===----------------------------------------------------------------------===// 
-#ifndef _LIBCPP_FILESYSTEM 
-#define _LIBCPP_FILESYSTEM 
-/* 
-    filesystem synopsis 
- 
-    namespace std { namespace filesystem { 
- 
-    class path; 
- 
-    void swap(path& lhs, path& rhs) noexcept; 
-    size_t hash_value(const path& p) noexcept; 
- 
-    bool operator==(const path& lhs, const path& rhs) noexcept; 
-    bool operator!=(const path& lhs, const path& rhs) noexcept; 
-    bool operator< (const path& lhs, const path& rhs) noexcept; 
-    bool operator<=(const path& lhs, const path& rhs) noexcept; 
-    bool operator> (const path& lhs, const path& rhs) noexcept; 
-    bool operator>=(const path& lhs, const path& rhs) noexcept; 
- 
-    path operator/ (const path& lhs, const path& rhs); 
- 
-    // fs.path.io operators are friends of path. 
-    template <class charT, class traits> 
-    friend basic_ostream<charT, traits>& 
-    operator<<(basic_ostream<charT, traits>& os, const path& p); 
- 
-    template <class charT, class traits> 
-    friend basic_istream<charT, traits>& 
-    operator>>(basic_istream<charT, traits>& is, path& p); 
- 
-    template <class Source> 
-      path u8path(const Source& source); 
-    template <class InputIterator> 
-      path u8path(InputIterator first, InputIterator last); 
- 
-    class filesystem_error; 
-    class directory_entry; 
- 
-    class directory_iterator; 
- 
-    // enable directory_iterator range-based for statements 
-    directory_iterator begin(directory_iterator iter) noexcept; 
-    directory_iterator end(const directory_iterator&) noexcept; 
- 
-    class recursive_directory_iterator; 
- 
-    // enable recursive_directory_iterator range-based for statements 
-    recursive_directory_iterator begin(recursive_directory_iterator iter) noexcept; 
-    recursive_directory_iterator end(const recursive_directory_iterator&) noexcept; 
- 
-    class file_status; 
- 
-    struct space_info 
-    { 
-      uintmax_t capacity; 
-      uintmax_t free; 
-      uintmax_t available; 
-    }; 
- 
-    enum class file_type; 
-    enum class perms; 
-    enum class perm_options; 
-    enum class copy_options; 
-    enum class directory_options; 
- 
-    typedef chrono::time_point<trivial-clock>  file_time_type; 
- 
-    // operational functions 
- 
-    path absolute(const path& p); 
-    path absolute(const path& p, error_code &ec); 
- 
-    path canonical(const path& p); 
-    path canonical(const path& p, error_code& ec); 
- 
-    void copy(const path& from, const path& to); 
-    void copy(const path& from, const path& to, error_code& ec); 
-    void copy(const path& from, const path& to, copy_options options); 
-    void copy(const path& from, const path& to, copy_options options, 
-                   error_code& ec); 
- 
-    bool copy_file(const path& from, const path& to); 
-    bool copy_file(const path& from, const path& to, error_code& ec); 
-    bool copy_file(const path& from, const path& to, copy_options option); 
-    bool copy_file(const path& from, const path& to, copy_options option, 
-                           error_code& ec); 
- 
-    void copy_symlink(const path& existing_symlink, const path& new_symlink); 
-    void copy_symlink(const path& existing_symlink, const path& new_symlink, 
-                              error_code& ec) noexcept; 
- 
-    bool create_directories(const path& p); 
-    bool create_directories(const path& p, error_code& ec); 
- 
-    bool create_directory(const path& p); 
-    bool create_directory(const path& p, error_code& ec) noexcept; 
- 
-    bool create_directory(const path& p, const path& attributes); 
-    bool create_directory(const path& p, const path& attributes, 
-                                  error_code& ec) noexcept; 
- 
-    void create_directory_symlink(const path& to, const path& new_symlink); 
-    void create_directory_symlink(const path& to, const path& new_symlink, 
-                                          error_code& ec) noexcept; 
- 
-    void create_hard_link(const path& to, const path& new_hard_link); 
-    void create_hard_link(const path& to, const path& new_hard_link, 
-                                  error_code& ec) noexcept; 
- 
-    void create_symlink(const path& to, const path& new_symlink); 
-    void create_symlink(const path& to, const path& new_symlink, 
-                                error_code& ec) noexcept; 
- 
-    path current_path(); 
-    path current_path(error_code& ec); 
-    void current_path(const path& p); 
-    void current_path(const path& p, error_code& ec) noexcept; 
- 
-    bool exists(file_status s) noexcept; 
-    bool exists(const path& p); 
-    bool exists(const path& p, error_code& ec) noexcept; 
- 
-    bool equivalent(const path& p1, const path& p2); 
-    bool equivalent(const path& p1, const path& p2, error_code& ec) noexcept; 
- 
-    uintmax_t    file_size(const path& p); 
-    uintmax_t    file_size(const path& p, error_code& ec) noexcept; 
- 
-    uintmax_t    hard_link_count(const path& p); 
-    uintmax_t    hard_link_count(const path& p, error_code& ec) noexcept; 
- 
-    bool is_block_file(file_status s) noexcept; 
-    bool is_block_file(const path& p); 
-    bool is_block_file(const path& p, error_code& ec) noexcept; 
- 
-    bool is_character_file(file_status s) noexcept; 
-    bool is_character_file(const path& p); 
-    bool is_character_file(const path& p, error_code& ec) noexcept; 
- 
-    bool is_directory(file_status s) noexcept; 
-    bool is_directory(const path& p); 
-    bool is_directory(const path& p, error_code& ec) noexcept; 
- 
-    bool is_empty(const path& p); 
-    bool is_empty(const path& p, error_code& ec) noexcept; 
- 
-    bool is_fifo(file_status s) noexcept; 
-    bool is_fifo(const path& p); 
-    bool is_fifo(const path& p, error_code& ec) noexcept; 
- 
-    bool is_other(file_status s) noexcept; 
-    bool is_other(const path& p); 
-    bool is_other(const path& p, error_code& ec) noexcept; 
- 
-    bool is_regular_file(file_status s) noexcept; 
-    bool is_regular_file(const path& p); 
-    bool is_regular_file(const path& p, error_code& ec) noexcept; 
- 
-    bool is_socket(file_status s) noexcept; 
-    bool is_socket(const path& p); 
-    bool is_socket(const path& p, error_code& ec) noexcept; 
- 
-    bool is_symlink(file_status s) noexcept; 
-    bool is_symlink(const path& p); 
-    bool is_symlink(const path& p, error_code& ec) noexcept; 
- 
-    file_time_type  last_write_time(const path& p); 
-    file_time_type  last_write_time(const path& p, error_code& ec) noexcept; 
-    void last_write_time(const path& p, file_time_type new_time); 
-    void last_write_time(const path& p, file_time_type new_time, 
-                                 error_code& ec) noexcept; 
- 
-    void permissions(const path& p, perms prms, 
-                     perm_options opts=perm_options::replace); 
-    void permissions(const path& p, perms prms, error_code& ec) noexcept; 
-    void permissions(const path& p, perms prms, perm_options opts, 
-                     error_code& ec); 
- 
-    path proximate(const path& p, error_code& ec); 
-    path proximate(const path& p, const path& base = current_path()); 
-    path proximate(const path& p, const path& base, error_code &ec); 
- 
-    path read_symlink(const path& p); 
-    path read_symlink(const path& p, error_code& ec); 
- 
-    path relative(const path& p, error_code& ec); 
-    path relative(const path& p, const path& base=current_path()); 
-    path relative(const path& p, const path& base, error_code& ec); 
- 
-    bool remove(const path& p); 
-    bool remove(const path& p, error_code& ec) noexcept; 
- 
-    uintmax_t    remove_all(const path& p); 
-    uintmax_t    remove_all(const path& p, error_code& ec); 
- 
-    void rename(const path& from, const path& to); 
-    void rename(const path& from, const path& to, error_code& ec) noexcept; 
- 
-    void resize_file(const path& p, uintmax_t size); 
-    void resize_file(const path& p, uintmax_t size, error_code& ec) noexcept; 
- 
-    space_info   space(const path& p); 
-    space_info   space(const path& p, error_code& ec) noexcept; 
- 
-    file_status  status(const path& p); 
-    file_status  status(const path& p, error_code& ec) noexcept; 
- 
-    bool status_known(file_status s) noexcept; 
- 
-    file_status  symlink_status(const path& p); 
-    file_status  symlink_status(const path& p, error_code& ec) noexcept; 
- 
-    path temp_directory_path(); 
-    path temp_directory_path(error_code& ec); 
- 
-    path weakly_canonical(path const& p); 
-    path weakly_canonical(path const& p, error_code& ec); 
- 
- 
-} }  // namespaces std::filesystem 
- 
-*/ 
- 
-#include <__availability> 
-#include <__config> 
-#include <__debug> 
-#include <__utility/forward.h> 
-#include <chrono> 
-#include <compare> 
-#include <cstddef> 
-#include <cstdlib> 
-#include <iosfwd> 
-#include <iterator> 
-#include <memory> 
-#include <stack> 
-#include <string> 
-#include <string_view> 
-#include <system_error> 
-#include <utility> 
+//
+//===----------------------------------------------------------------------===//
+#ifndef _LIBCPP_FILESYSTEM
+#define _LIBCPP_FILESYSTEM
+/*
+    filesystem synopsis
+
+    namespace std { namespace filesystem {
+
+    class path;
+
+    void swap(path& lhs, path& rhs) noexcept;
+    size_t hash_value(const path& p) noexcept;
+
+    bool operator==(const path& lhs, const path& rhs) noexcept;
+    bool operator!=(const path& lhs, const path& rhs) noexcept;
+    bool operator< (const path& lhs, const path& rhs) noexcept;
+    bool operator<=(const path& lhs, const path& rhs) noexcept;
+    bool operator> (const path& lhs, const path& rhs) noexcept;
+    bool operator>=(const path& lhs, const path& rhs) noexcept;
+
+    path operator/ (const path& lhs, const path& rhs);
+
+    // fs.path.io operators are friends of path.
+    template <class charT, class traits>
+    friend basic_ostream<charT, traits>&
+    operator<<(basic_ostream<charT, traits>& os, const path& p);
+
+    template <class charT, class traits>
+    friend basic_istream<charT, traits>&
+    operator>>(basic_istream<charT, traits>& is, path& p);
+
+    template <class Source>
+      path u8path(const Source& source);
+    template <class InputIterator>
+      path u8path(InputIterator first, InputIterator last);
+
+    class filesystem_error;
+    class directory_entry;
+
+    class directory_iterator;
+
+    // enable directory_iterator range-based for statements
+    directory_iterator begin(directory_iterator iter) noexcept;
+    directory_iterator end(const directory_iterator&) noexcept;
+
+    class recursive_directory_iterator;
+
+    // enable recursive_directory_iterator range-based for statements
+    recursive_directory_iterator begin(recursive_directory_iterator iter) noexcept;
+    recursive_directory_iterator end(const recursive_directory_iterator&) noexcept;
+
+    class file_status;
+
+    struct space_info
+    {
+      uintmax_t capacity;
+      uintmax_t free;
+      uintmax_t available;
+    };
+
+    enum class file_type;
+    enum class perms;
+    enum class perm_options;
+    enum class copy_options;
+    enum class directory_options;
+
+    typedef chrono::time_point<trivial-clock>  file_time_type;
+
+    // operational functions
+
+    path absolute(const path& p);
+    path absolute(const path& p, error_code &ec);
+
+    path canonical(const path& p);
+    path canonical(const path& p, error_code& ec);
+
+    void copy(const path& from, const path& to);
+    void copy(const path& from, const path& to, error_code& ec);
+    void copy(const path& from, const path& to, copy_options options);
+    void copy(const path& from, const path& to, copy_options options,
+                   error_code& ec);
+
+    bool copy_file(const path& from, const path& to);
+    bool copy_file(const path& from, const path& to, error_code& ec);
+    bool copy_file(const path& from, const path& to, copy_options option);
+    bool copy_file(const path& from, const path& to, copy_options option,
+                           error_code& ec);
+
+    void copy_symlink(const path& existing_symlink, const path& new_symlink);
+    void copy_symlink(const path& existing_symlink, const path& new_symlink,
+                              error_code& ec) noexcept;
+
+    bool create_directories(const path& p);
+    bool create_directories(const path& p, error_code& ec);
+
+    bool create_directory(const path& p);
+    bool create_directory(const path& p, error_code& ec) noexcept;
+
+    bool create_directory(const path& p, const path& attributes);
+    bool create_directory(const path& p, const path& attributes,
+                                  error_code& ec) noexcept;
+
+    void create_directory_symlink(const path& to, const path& new_symlink);
+    void create_directory_symlink(const path& to, const path& new_symlink,
+                                          error_code& ec) noexcept;
+
+    void create_hard_link(const path& to, const path& new_hard_link);
+    void create_hard_link(const path& to, const path& new_hard_link,
+                                  error_code& ec) noexcept;
+
+    void create_symlink(const path& to, const path& new_symlink);
+    void create_symlink(const path& to, const path& new_symlink,
+                                error_code& ec) noexcept;
+
+    path current_path();
+    path current_path(error_code& ec);
+    void current_path(const path& p);
+    void current_path(const path& p, error_code& ec) noexcept;
+
+    bool exists(file_status s) noexcept;
+    bool exists(const path& p);
+    bool exists(const path& p, error_code& ec) noexcept;
+
+    bool equivalent(const path& p1, const path& p2);
+    bool equivalent(const path& p1, const path& p2, error_code& ec) noexcept;
+
+    uintmax_t    file_size(const path& p);
+    uintmax_t    file_size(const path& p, error_code& ec) noexcept;
+
+    uintmax_t    hard_link_count(const path& p);
+    uintmax_t    hard_link_count(const path& p, error_code& ec) noexcept;
+
+    bool is_block_file(file_status s) noexcept;
+    bool is_block_file(const path& p);
+    bool is_block_file(const path& p, error_code& ec) noexcept;
+
+    bool is_character_file(file_status s) noexcept;
+    bool is_character_file(const path& p);
+    bool is_character_file(const path& p, error_code& ec) noexcept;
+
+    bool is_directory(file_status s) noexcept;
+    bool is_directory(const path& p);
+    bool is_directory(const path& p, error_code& ec) noexcept;
+
+    bool is_empty(const path& p);
+    bool is_empty(const path& p, error_code& ec) noexcept;
+
+    bool is_fifo(file_status s) noexcept;
+    bool is_fifo(const path& p);
+    bool is_fifo(const path& p, error_code& ec) noexcept;
+
+    bool is_other(file_status s) noexcept;
+    bool is_other(const path& p);
+    bool is_other(const path& p, error_code& ec) noexcept;
+
+    bool is_regular_file(file_status s) noexcept;
+    bool is_regular_file(const path& p);
+    bool is_regular_file(const path& p, error_code& ec) noexcept;
+
+    bool is_socket(file_status s) noexcept;
+    bool is_socket(const path& p);
+    bool is_socket(const path& p, error_code& ec) noexcept;
+
+    bool is_symlink(file_status s) noexcept;
+    bool is_symlink(const path& p);
+    bool is_symlink(const path& p, error_code& ec) noexcept;
+
+    file_time_type  last_write_time(const path& p);
+    file_time_type  last_write_time(const path& p, error_code& ec) noexcept;
+    void last_write_time(const path& p, file_time_type new_time);
+    void last_write_time(const path& p, file_time_type new_time,
+                                 error_code& ec) noexcept;
+
+    void permissions(const path& p, perms prms,
+                     perm_options opts=perm_options::replace);
+    void permissions(const path& p, perms prms, error_code& ec) noexcept;
+    void permissions(const path& p, perms prms, perm_options opts,
+                     error_code& ec);
+
+    path proximate(const path& p, error_code& ec);
+    path proximate(const path& p, const path& base = current_path());
+    path proximate(const path& p, const path& base, error_code &ec);
+
+    path read_symlink(const path& p);
+    path read_symlink(const path& p, error_code& ec);
+
+    path relative(const path& p, error_code& ec);
+    path relative(const path& p, const path& base=current_path());
+    path relative(const path& p, const path& base, error_code& ec);
+
+    bool remove(const path& p);
+    bool remove(const path& p, error_code& ec) noexcept;
+
+    uintmax_t    remove_all(const path& p);
+    uintmax_t    remove_all(const path& p, error_code& ec);
+
+    void rename(const path& from, const path& to);
+    void rename(const path& from, const path& to, error_code& ec) noexcept;
+
+    void resize_file(const path& p, uintmax_t size);
+    void resize_file(const path& p, uintmax_t size, error_code& ec) noexcept;
+
+    space_info   space(const path& p);
+    space_info   space(const path& p, error_code& ec) noexcept;
+
+    file_status  status(const path& p);
+    file_status  status(const path& p, error_code& ec) noexcept;
+
+    bool status_known(file_status s) noexcept;
+
+    file_status  symlink_status(const path& p);
+    file_status  symlink_status(const path& p, error_code& ec) noexcept;
+
+    path temp_directory_path();
+    path temp_directory_path(error_code& ec);
+
+    path weakly_canonical(path const& p);
+    path weakly_canonical(path const& p, error_code& ec);
+
+
+} }  // namespaces std::filesystem
+
+*/
+
+#include <__availability>
+#include <__config>
+#include <__debug>
+#include <__utility/forward.h>
+#include <chrono>
+#include <compare>
+#include <cstddef>
+#include <cstdlib>
+#include <iosfwd>
+#include <iterator>
+#include <memory>
+#include <stack>
+#include <string>
+#include <string_view>
+#include <system_error>
+#include <utility>
 #include <version>
- 
-#if !defined(_LIBCPP_HAS_NO_LOCALIZATION) 
-# include <locale> 
-# include <iomanip> // for quoted 
-#endif 
- 
-#if defined(_LIBCPP_HAS_NO_FILESYSTEM_LIBRARY) 
-# error "The Filesystem library is not supported since libc++ has been configured with LIBCXX_ENABLE_FILESYSTEM disabled" 
-#endif 
- 
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 
-#pragma GCC system_header 
-#endif 
- 
-_LIBCPP_PUSH_MACROS 
- 
-#ifdef _LIBCPP_COMPILER_MSVC 
-#pragma warning ( push ) 
-#pragma warning ( disable : 4141 ) 
-#endif 
- 
-#include <__undef_macros> 
- 
-#ifndef _LIBCPP_CXX03_LANG 
- 
-_LIBCPP_BEGIN_NAMESPACE_FILESYSTEM 
- 
-_LIBCPP_AVAILABILITY_FILESYSTEM_PUSH 
- 
-typedef chrono::time_point<_FilesystemClock> file_time_type; 
- 
-struct _LIBCPP_TYPE_VIS space_info { 
-  uintmax_t capacity; 
-  uintmax_t free; 
-  uintmax_t available; 
-}; 
- 
-// On Windows, the library never identifies files as block, character, fifo 
-// or socket. 
-enum class _LIBCPP_ENUM_VIS file_type : signed char { 
-  none = 0, 
-  not_found = -1, 
-  regular = 1, 
-  directory = 2, 
-  symlink = 3, 
-  block = 4, 
-  character = 5, 
-  fifo = 6, 
-  socket = 7, 
-  unknown = 8 
-}; 
- 
-// On Windows, these permission bits map to one single readonly flag per 
-// file, and the executable bit is always returned as set. When setting 
-// permissions, as long as the write bit is set for either owner, group or 
-// others, the readonly flag is cleared. 
-enum class _LIBCPP_ENUM_VIS perms : unsigned { 
-  none = 0, 
- 
-  owner_read = 0400, 
-  owner_write = 0200, 
-  owner_exec = 0100, 
-  owner_all = 0700, 
- 
-  group_read = 040, 
-  group_write = 020, 
-  group_exec = 010, 
-  group_all = 070, 
- 
-  others_read = 04, 
-  others_write = 02, 
-  others_exec = 01, 
-  others_all = 07, 
- 
-  all = 0777, 
- 
-  set_uid = 04000, 
-  set_gid = 02000, 
-  sticky_bit = 01000, 
-  mask = 07777, 
-  unknown = 0xFFFF, 
-}; 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline constexpr perms operator&(perms _LHS, perms _RHS) { 
-  return static_cast<perms>(static_cast<unsigned>(_LHS) & 
-                            static_cast<unsigned>(_RHS)); 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline constexpr perms operator|(perms _LHS, perms _RHS) { 
-  return static_cast<perms>(static_cast<unsigned>(_LHS) | 
-                            static_cast<unsigned>(_RHS)); 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline constexpr perms operator^(perms _LHS, perms _RHS) { 
-  return static_cast<perms>(static_cast<unsigned>(_LHS) ^ 
-                            static_cast<unsigned>(_RHS)); 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline constexpr perms operator~(perms _LHS) { 
-  return static_cast<perms>(~static_cast<unsigned>(_LHS)); 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline perms& operator&=(perms& _LHS, perms _RHS) { return _LHS = _LHS & _RHS; } 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline perms& operator|=(perms& _LHS, perms _RHS) { return _LHS = _LHS | _RHS; } 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline perms& operator^=(perms& _LHS, perms _RHS) { return _LHS = _LHS ^ _RHS; } 
- 
-enum class _LIBCPP_ENUM_VIS perm_options : unsigned char { 
-  replace = 1, 
-  add = 2, 
-  remove = 4, 
-  nofollow = 8 
-}; 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline constexpr perm_options operator&(perm_options _LHS, perm_options _RHS) { 
-  return static_cast<perm_options>(static_cast<unsigned>(_LHS) & 
-                                   static_cast<unsigned>(_RHS)); 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline constexpr perm_options operator|(perm_options _LHS, perm_options _RHS) { 
-  return static_cast<perm_options>(static_cast<unsigned>(_LHS) | 
-                                   static_cast<unsigned>(_RHS)); 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline constexpr perm_options operator^(perm_options _LHS, perm_options _RHS) { 
-  return static_cast<perm_options>(static_cast<unsigned>(_LHS) ^ 
-                                   static_cast<unsigned>(_RHS)); 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline constexpr perm_options operator~(perm_options _LHS) { 
-  return static_cast<perm_options>(~static_cast<unsigned>(_LHS)); 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline perm_options& operator&=(perm_options& _LHS, perm_options _RHS) { 
-  return _LHS = _LHS & _RHS; 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline perm_options& operator|=(perm_options& _LHS, perm_options _RHS) { 
-  return _LHS = _LHS | _RHS; 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline perm_options& operator^=(perm_options& _LHS, perm_options _RHS) { 
-  return _LHS = _LHS ^ _RHS; 
-} 
- 
-enum class _LIBCPP_ENUM_VIS copy_options : unsigned short { 
-  none = 0, 
-  skip_existing = 1, 
-  overwrite_existing = 2, 
-  update_existing = 4, 
-  recursive = 8, 
-  copy_symlinks = 16, 
-  skip_symlinks = 32, 
-  directories_only = 64, 
-  create_symlinks = 128, 
-  create_hard_links = 256, 
-  __in_recursive_copy = 512, 
-}; 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline constexpr copy_options operator&(copy_options _LHS, copy_options _RHS) { 
-  return static_cast<copy_options>(static_cast<unsigned short>(_LHS) & 
-                                   static_cast<unsigned short>(_RHS)); 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline constexpr copy_options operator|(copy_options _LHS, copy_options _RHS) { 
-  return static_cast<copy_options>(static_cast<unsigned short>(_LHS) | 
-                                   static_cast<unsigned short>(_RHS)); 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline constexpr copy_options operator^(copy_options _LHS, copy_options _RHS) { 
-  return static_cast<copy_options>(static_cast<unsigned short>(_LHS) ^ 
-                                   static_cast<unsigned short>(_RHS)); 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline constexpr copy_options operator~(copy_options _LHS) { 
-  return static_cast<copy_options>(~static_cast<unsigned short>(_LHS)); 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline copy_options& operator&=(copy_options& _LHS, copy_options _RHS) { 
-  return _LHS = _LHS & _RHS; 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline copy_options& operator|=(copy_options& _LHS, copy_options _RHS) { 
-  return _LHS = _LHS | _RHS; 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline copy_options& operator^=(copy_options& _LHS, copy_options _RHS) { 
-  return _LHS = _LHS ^ _RHS; 
-} 
- 
-enum class _LIBCPP_ENUM_VIS directory_options : unsigned char { 
-  none = 0, 
-  follow_directory_symlink = 1, 
-  skip_permission_denied = 2 
-}; 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline constexpr directory_options operator&(directory_options _LHS, 
-                                             directory_options _RHS) { 
-  return static_cast<directory_options>(static_cast<unsigned char>(_LHS) & 
-                                        static_cast<unsigned char>(_RHS)); 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline constexpr directory_options operator|(directory_options _LHS, 
-                                             directory_options _RHS) { 
-  return static_cast<directory_options>(static_cast<unsigned char>(_LHS) | 
-                                        static_cast<unsigned char>(_RHS)); 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline constexpr directory_options operator^(directory_options _LHS, 
-                                             directory_options _RHS) { 
-  return static_cast<directory_options>(static_cast<unsigned char>(_LHS) ^ 
-                                        static_cast<unsigned char>(_RHS)); 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline constexpr directory_options operator~(directory_options _LHS) { 
-  return static_cast<directory_options>(~static_cast<unsigned char>(_LHS)); 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline directory_options& operator&=(directory_options& _LHS, 
-                                     directory_options _RHS) { 
-  return _LHS = _LHS & _RHS; 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline directory_options& operator|=(directory_options& _LHS, 
-                                     directory_options _RHS) { 
-  return _LHS = _LHS | _RHS; 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline directory_options& operator^=(directory_options& _LHS, 
-                                     directory_options _RHS) { 
-  return _LHS = _LHS ^ _RHS; 
-} 
- 
-class _LIBCPP_TYPE_VIS file_status { 
-public: 
-  // constructors 
-  _LIBCPP_INLINE_VISIBILITY 
-  file_status() noexcept : file_status(file_type::none) {} 
-  _LIBCPP_INLINE_VISIBILITY 
-  explicit file_status(file_type __ft, perms __prms = perms::unknown) noexcept 
-      : __ft_(__ft), 
-        __prms_(__prms) {} 
- 
-  file_status(const file_status&) noexcept = default; 
-  file_status(file_status&&) noexcept = default; 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  ~file_status() {} 
- 
-  file_status& operator=(const file_status&) noexcept = default; 
-  file_status& operator=(file_status&&) noexcept = default; 
- 
-  // observers 
-  _LIBCPP_INLINE_VISIBILITY 
-  file_type type() const noexcept { return __ft_; } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  perms permissions() const noexcept { return __prms_; } 
- 
-  // modifiers 
-  _LIBCPP_INLINE_VISIBILITY 
-  void type(file_type __ft) noexcept { __ft_ = __ft; } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  void permissions(perms __p) noexcept { __prms_ = __p; } 
- 
-private: 
-  file_type __ft_; 
-  perms __prms_; 
-}; 
- 
-class _LIBCPP_TYPE_VIS directory_entry; 
- 
-template <class _Tp> 
-struct __can_convert_char { 
-  static const bool value = false; 
-}; 
-template <class _Tp> 
-struct __can_convert_char<const _Tp> : public __can_convert_char<_Tp> {}; 
-template <> 
-struct __can_convert_char<char> { 
-  static const bool value = true; 
-  using __char_type = char; 
-}; 
-template <> 
-struct __can_convert_char<wchar_t> { 
-  static const bool value = true; 
-  using __char_type = wchar_t; 
-}; 
-#ifndef _LIBCPP_HAS_NO_CHAR8_T 
-template <> 
-struct __can_convert_char<char8_t> { 
-  static const bool value = true; 
-  using __char_type = char8_t; 
-}; 
-#endif 
-template <> 
-struct __can_convert_char<char16_t> { 
-  static const bool value = true; 
-  using __char_type = char16_t; 
-}; 
-template <> 
-struct __can_convert_char<char32_t> { 
-  static const bool value = true; 
-  using __char_type = char32_t; 
-}; 
- 
-template <class _ECharT> 
-typename enable_if<__can_convert_char<_ECharT>::value, bool>::type 
-__is_separator(_ECharT __e) { 
-#if defined(_LIBCPP_WIN32API) 
-  return __e == _ECharT('/') || __e == _ECharT('\\'); 
-#else 
-  return __e == _ECharT('/'); 
-#endif 
-}
- 
-#ifndef _LIBCPP_HAS_NO_CHAR8_T 
-typedef u8string __u8_string; 
-#else 
-typedef string __u8_string; 
-#endif 
- 
-struct _NullSentinel {}; 
- 
-template <class _Tp> 
-using _Void = void; 
- 
-template <class _Tp, class = void> 
-struct __is_pathable_string : public false_type {}; 
- 
-template <class _ECharT, class _Traits, class _Alloc> 
-struct __is_pathable_string< 
-    basic_string<_ECharT, _Traits, _Alloc>, 
-    _Void<typename __can_convert_char<_ECharT>::__char_type> > 
-    : public __can_convert_char<_ECharT> { 
-  using _Str = basic_string<_ECharT, _Traits, _Alloc>; 
-  using _Base = __can_convert_char<_ECharT>; 
-  static _ECharT const* __range_begin(_Str const& __s) { return __s.data(); } 
-  static _ECharT const* __range_end(_Str const& __s) { 
-    return __s.data() + __s.length(); 
-  } 
-  static _ECharT __first_or_null(_Str const& __s) { 
-    return __s.empty() ? _ECharT{} : __s[0]; 
-  } 
-}; 
- 
-template <class _ECharT, class _Traits> 
-struct __is_pathable_string< 
-    basic_string_view<_ECharT, _Traits>, 
-    _Void<typename __can_convert_char<_ECharT>::__char_type> > 
-    : public __can_convert_char<_ECharT> { 
-  using _Str = basic_string_view<_ECharT, _Traits>; 
-  using _Base = __can_convert_char<_ECharT>; 
-  static _ECharT const* __range_begin(_Str const& __s) { return __s.data(); } 
-  static _ECharT const* __range_end(_Str const& __s) { 
-    return __s.data() + __s.length(); 
-  } 
-  static _ECharT __first_or_null(_Str const& __s) { 
-    return __s.empty() ? _ECharT{} : __s[0]; 
-  } 
-}; 
- 
-template <class _Source, class _DS = typename decay<_Source>::type, 
-          class _UnqualPtrType = 
-              typename remove_const<typename remove_pointer<_DS>::type>::type, 
-          bool _IsCharPtr = is_pointer<_DS>::value&& 
-              __can_convert_char<_UnqualPtrType>::value> 
-struct __is_pathable_char_array : false_type {}; 
- 
-template <class _Source, class _ECharT, class _UPtr> 
-struct __is_pathable_char_array<_Source, _ECharT*, _UPtr, true> 
-    : __can_convert_char<typename remove_const<_ECharT>::type> { 
-  using _Base = __can_convert_char<typename remove_const<_ECharT>::type>; 
- 
-  static _ECharT const* __range_begin(const _ECharT* __b) { return __b; } 
-  static _ECharT const* __range_end(const _ECharT* __b) { 
-    using _Iter = const _ECharT*; 
-    const _ECharT __sentinel = _ECharT{}; 
-    _Iter __e = __b; 
-    for (; *__e != __sentinel; ++__e) 
-      ; 
-    return __e; 
-  } 
- 
-  static _ECharT __first_or_null(const _ECharT* __b) { return *__b; } 
-}; 
- 
-template <class _Iter, bool _IsIt = __is_cpp17_input_iterator<_Iter>::value, 
-          class = void> 
-struct __is_pathable_iter : false_type {}; 
- 
-template <class _Iter> 
-struct __is_pathable_iter< 
-    _Iter, true, 
-    _Void<typename __can_convert_char< 
-        typename iterator_traits<_Iter>::value_type>::__char_type> > 
-    : __can_convert_char<typename iterator_traits<_Iter>::value_type> { 
-  using _ECharT = typename iterator_traits<_Iter>::value_type; 
-  using _Base = __can_convert_char<_ECharT>; 
- 
-  static _Iter __range_begin(_Iter __b) { return __b; } 
-  static _NullSentinel __range_end(_Iter) { return _NullSentinel{}; } 
- 
-  static _ECharT __first_or_null(_Iter __b) { return *__b; } 
-}; 
- 
-template <class _Tp, bool _IsStringT = __is_pathable_string<_Tp>::value, 
-          bool _IsCharIterT = __is_pathable_char_array<_Tp>::value, 
-          bool _IsIterT = !_IsCharIterT && __is_pathable_iter<_Tp>::value> 
-struct __is_pathable : false_type { 
-  static_assert(!_IsStringT && !_IsCharIterT && !_IsIterT, "Must all be false"); 
-}; 
- 
-template <class _Tp> 
-struct __is_pathable<_Tp, true, false, false> : __is_pathable_string<_Tp> {}; 
- 
-template <class _Tp> 
-struct __is_pathable<_Tp, false, true, false> : __is_pathable_char_array<_Tp> { 
-}; 
- 
-template <class _Tp> 
-struct __is_pathable<_Tp, false, false, true> : __is_pathable_iter<_Tp> {}; 
- 
-#if defined(_LIBCPP_WIN32API) 
-typedef wstring __path_string; 
-typedef wchar_t __path_value; 
-#else 
-typedef string __path_string; 
-typedef char __path_value; 
-#endif 
- 
-#if defined(_LIBCPP_WIN32API) 
-_LIBCPP_FUNC_VIS 
-size_t __wide_to_char(const wstring&, char*, size_t); 
-_LIBCPP_FUNC_VIS 
-size_t __char_to_wide(const string&, wchar_t*, size_t); 
-#endif 
- 
-template <class _ECharT> 
-struct _PathCVT; 
- 
-#if !defined(_LIBCPP_HAS_NO_LOCALIZATION) 
-template <class _ECharT> 
-struct _PathCVT { 
-  static_assert(__can_convert_char<_ECharT>::value, 
-                "Char type not convertible"); 
- 
-  typedef __narrow_to_utf8<sizeof(_ECharT) * __CHAR_BIT__> _Narrower; 
-#if defined(_LIBCPP_WIN32API) 
-  typedef __widen_from_utf8<sizeof(wchar_t) * __CHAR_BIT__> _Widener; 
-#endif 
- 
-  static void __append_range(__path_string& __dest, _ECharT const* __b, 
-                             _ECharT const* __e) { 
-#if defined(_LIBCPP_WIN32API) 
-    string __utf8; 
-    _Narrower()(back_inserter(__utf8), __b, __e); 
-    _Widener()(back_inserter(__dest), __utf8.data(), __utf8.data() + __utf8.size()); 
-#else 
-    _Narrower()(back_inserter(__dest), __b, __e); 
-#endif 
-  } 
- 
-  template <class _Iter> 
-  static void __append_range(__path_string& __dest, _Iter __b, _Iter __e) { 
-    static_assert(!is_same<_Iter, _ECharT*>::value, "Call const overload"); 
-    if (__b == __e) 
-      return; 
-    basic_string<_ECharT> __tmp(__b, __e); 
-#if defined(_LIBCPP_WIN32API) 
-    string __utf8; 
-    _Narrower()(back_inserter(__utf8), __tmp.data(), 
-                __tmp.data() + __tmp.length()); 
-    _Widener()(back_inserter(__dest), __utf8.data(), __utf8.data() + __utf8.size()); 
-#else 
-    _Narrower()(back_inserter(__dest), __tmp.data(), 
-                __tmp.data() + __tmp.length()); 
-#endif 
-  } 
- 
-  template <class _Iter> 
-  static void __append_range(__path_string& __dest, _Iter __b, _NullSentinel) { 
-    static_assert(!is_same<_Iter, _ECharT*>::value, "Call const overload"); 
-    const _ECharT __sentinel = _ECharT{}; 
-    if (*__b == __sentinel) 
-      return; 
-    basic_string<_ECharT> __tmp; 
-    for (; *__b != __sentinel; ++__b) 
-      __tmp.push_back(*__b); 
-#if defined(_LIBCPP_WIN32API) 
-    string __utf8; 
-    _Narrower()(back_inserter(__utf8), __tmp.data(), 
-                __tmp.data() + __tmp.length()); 
-    _Widener()(back_inserter(__dest), __utf8.data(), __utf8.data() + __utf8.size()); 
-#else 
-    _Narrower()(back_inserter(__dest), __tmp.data(), 
-                __tmp.data() + __tmp.length()); 
-#endif 
-  } 
- 
-  template <class _Source> 
-  static void __append_source(__path_string& __dest, _Source const& __s) { 
-    using _Traits = __is_pathable<_Source>; 
-    __append_range(__dest, _Traits::__range_begin(__s), 
-                   _Traits::__range_end(__s)); 
-  } 
-}; 
-#endif // !_LIBCPP_HAS_NO_LOCALIZATION 
- 
-template <> 
-struct _PathCVT<__path_value> { 
- 
-  template <class _Iter> 
-  static typename enable_if<__is_exactly_cpp17_input_iterator<_Iter>::value>::type 
-  __append_range(__path_string& __dest, _Iter __b, _Iter __e) { 
-    for (; __b != __e; ++__b) 
-      __dest.push_back(*__b); 
-  } 
- 
-  template <class _Iter> 
-  static typename enable_if<__is_cpp17_forward_iterator<_Iter>::value>::type 
-  __append_range(__path_string& __dest, _Iter __b, _Iter __e) { 
-    __dest.append(__b, __e); 
-  } 
- 
-  template <class _Iter> 
-  static void __append_range(__path_string& __dest, _Iter __b, _NullSentinel) { 
-    const char __sentinel = char{}; 
-    for (; *__b != __sentinel; ++__b) 
-      __dest.push_back(*__b); 
-  } 
- 
-  template <class _Source> 
-  static void __append_source(__path_string& __dest, _Source const& __s) { 
-    using _Traits = __is_pathable<_Source>; 
-    __append_range(__dest, _Traits::__range_begin(__s), 
-                   _Traits::__range_end(__s)); 
-  } 
-}; 
- 
-#if defined(_LIBCPP_WIN32API) 
-template <> 
-struct _PathCVT<char> { 
- 
-  static void 
-  __append_string(__path_string& __dest, const basic_string<char> &__str) { 
-      size_t __size = __char_to_wide(__str, nullptr, 0); 
-      size_t __pos = __dest.size(); 
-      __dest.resize(__pos + __size); 
-      __char_to_wide(__str, const_cast<__path_value*>(__dest.data()) + __pos, __size); 
-  } 
- 
-  template <class _Iter> 
-  static typename enable_if<__is_exactly_cpp17_input_iterator<_Iter>::value>::type 
-  __append_range(__path_string& __dest, _Iter __b, _Iter __e) { 
-    basic_string<char> __tmp(__b, __e); 
-    __append_string(__dest, __tmp); 
-  } 
- 
-  template <class _Iter> 
-  static typename enable_if<__is_cpp17_forward_iterator<_Iter>::value>::type 
-  __append_range(__path_string& __dest, _Iter __b, _Iter __e) { 
-    basic_string<char> __tmp(__b, __e); 
-    __append_string(__dest, __tmp); 
-  } 
- 
-  template <class _Iter> 
-  static void __append_range(__path_string& __dest, _Iter __b, _NullSentinel) { 
-    const char __sentinel = char{}; 
-    basic_string<char> __tmp; 
-    for (; *__b != __sentinel; ++__b) 
-      __tmp.push_back(*__b); 
-    __append_string(__dest, __tmp); 
-  } 
- 
-  template <class _Source> 
-  static void __append_source(__path_string& __dest, _Source const& __s) { 
-    using _Traits = __is_pathable<_Source>; 
-    __append_range(__dest, _Traits::__range_begin(__s), 
-                   _Traits::__range_end(__s)); 
-  } 
-}; 
- 
-template <class _ECharT> 
-struct _PathExport { 
-  typedef __narrow_to_utf8<sizeof(wchar_t) * __CHAR_BIT__> _Narrower; 
-  typedef __widen_from_utf8<sizeof(_ECharT) * __CHAR_BIT__> _Widener; 
- 
-  template <class _Str> 
-  static void __append(_Str& __dest, const __path_string& __src) { 
-    string __utf8; 
-    _Narrower()(back_inserter(__utf8), __src.data(), __src.data() + __src.size()); 
-    _Widener()(back_inserter(__dest), __utf8.data(), __utf8.data() + __utf8.size()); 
-  } 
-}; 
- 
-template <> 
-struct _PathExport<char> { 
-  template <class _Str> 
-  static void __append(_Str& __dest, const __path_string& __src) { 
-    size_t __size = __wide_to_char(__src, nullptr, 0); 
-    size_t __pos = __dest.size(); 
-    __dest.resize(__size); 
-    __wide_to_char(__src, const_cast<char*>(__dest.data()) + __pos, __size); 
-  } 
-}; 
- 
-template <> 
-struct _PathExport<wchar_t> { 
-  template <class _Str> 
-  static void __append(_Str& __dest, const __path_string& __src) { 
-    __dest.append(__src.begin(), __src.end()); 
-  } 
-}; 
- 
-template <> 
-struct _PathExport<char16_t> { 
-  template <class _Str> 
-  static void __append(_Str& __dest, const __path_string& __src) { 
-    __dest.append(__src.begin(), __src.end()); 
-  } 
-}; 
- 
-#ifndef _LIBCPP_HAS_NO_CHAR8_T 
-template <> 
-struct _PathExport<char8_t> { 
-  typedef __narrow_to_utf8<sizeof(wchar_t) * __CHAR_BIT__> _Narrower; 
- 
-  template <class _Str> 
-  static void __append(_Str& __dest, const __path_string& __src) { 
-    _Narrower()(back_inserter(__dest), __src.data(), __src.data() + __src.size()); 
-  } 
-}; 
-#endif /* !_LIBCPP_HAS_NO_CHAR8_T */ 
-#endif /* _LIBCPP_WIN32API */ 
- 
-class _LIBCPP_TYPE_VIS path { 
-  template <class _SourceOrIter, class _Tp = path&> 
-  using _EnableIfPathable = 
-      typename enable_if<__is_pathable<_SourceOrIter>::value, _Tp>::type; 
- 
-  template <class _Tp> 
-  using _SourceChar = typename __is_pathable<_Tp>::__char_type; 
- 
-  template <class _Tp> 
-  using _SourceCVT = _PathCVT<_SourceChar<_Tp> >; 
- 
-public: 
-#if defined(_LIBCPP_WIN32API) 
-  typedef wchar_t value_type; 
-  static constexpr value_type preferred_separator = L'\\'; 
-#else 
-  typedef char value_type; 
-  static constexpr value_type preferred_separator = '/'; 
-#endif 
-  typedef basic_string<value_type> string_type; 
-  typedef basic_string_view<value_type> __string_view; 
- 
-  enum _LIBCPP_ENUM_VIS format : unsigned char { 
-    auto_format, 
-    native_format, 
-    generic_format 
-  }; 
- 
-  // constructors and destructor 
-  _LIBCPP_INLINE_VISIBILITY path() noexcept {} 
-  _LIBCPP_INLINE_VISIBILITY path(const path& __p) : __pn_(__p.__pn_) {} 
-  _LIBCPP_INLINE_VISIBILITY path(path&& __p) noexcept 
-      : __pn_(_VSTD::move(__p.__pn_)) {} 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  path(string_type&& __s, format = format::auto_format) noexcept 
-      : __pn_(_VSTD::move(__s)) {} 
- 
-  template <class _Source, class = _EnableIfPathable<_Source, void> > 
-  path(const _Source& __src, format = format::auto_format) { 
-    _SourceCVT<_Source>::__append_source(__pn_, __src); 
-  } 
- 
-  template <class _InputIt> 
-  path(_InputIt __first, _InputIt __last, format = format::auto_format) { 
-    typedef typename iterator_traits<_InputIt>::value_type _ItVal; 
-    _PathCVT<_ItVal>::__append_range(__pn_, __first, __last); 
-  } 
- 
-#if !defined(_LIBCPP_HAS_NO_LOCALIZATION) 
-  // TODO Implement locale conversions. 
-  template <class _Source, class = _EnableIfPathable<_Source, void> > 
-  path(const _Source& __src, const locale& __loc, format = format::auto_format); 
-  template <class _InputIt> 
-  path(_InputIt __first, _InputIt _last, const locale& __loc, 
-       format = format::auto_format); 
-#endif 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  ~path() = default; 
- 
-  // assignments 
-  _LIBCPP_INLINE_VISIBILITY 
-  path& operator=(const path& __p) { 
-    __pn_ = __p.__pn_; 
-    return *this; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  path& operator=(path&& __p) noexcept { 
-    __pn_ = _VSTD::move(__p.__pn_); 
-    return *this; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  path& operator=(string_type&& __s) noexcept { 
-    __pn_ = _VSTD::move(__s); 
-    return *this; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  path& assign(string_type&& __s) noexcept { 
-    __pn_ = _VSTD::move(__s); 
-    return *this; 
-  } 
- 
-  template <class _Source> 
-  _LIBCPP_INLINE_VISIBILITY _EnableIfPathable<_Source> 
-  operator=(const _Source& __src) { 
-    return this->assign(__src); 
-  } 
- 
-  template <class _Source> 
-  _EnableIfPathable<_Source> assign(const _Source& __src) { 
-    __pn_.clear(); 
-    _SourceCVT<_Source>::__append_source(__pn_, __src); 
-    return *this; 
-  } 
- 
-  template <class _InputIt> 
-  path& assign(_InputIt __first, _InputIt __last) { 
-    typedef typename iterator_traits<_InputIt>::value_type _ItVal; 
-    __pn_.clear(); 
-    _PathCVT<_ItVal>::__append_range(__pn_, __first, __last); 
-    return *this; 
-  } 
- 
-public: 
-  // appends 
-#if defined(_LIBCPP_WIN32API) 
-  path& operator/=(const path& __p) { 
-    auto __p_root_name = __p.__root_name(); 
-    auto __p_root_name_size = __p_root_name.size(); 
-    if (__p.is_absolute() || 
-        (!__p_root_name.empty() && __p_root_name != root_name())) { 
-      __pn_ = __p.__pn_; 
-      return *this; 
-    } 
-    if (__p.has_root_directory()) { 
-      path __root_name_str = root_name(); 
-      __pn_ = __root_name_str.native(); 
-      __pn_ += __string_view(__p.__pn_).substr(__p_root_name_size); 
-      return *this; 
-    } 
-    if (has_filename() || (!has_root_directory() && is_absolute())) 
-      __pn_ += preferred_separator; 
-    __pn_ += __string_view(__p.__pn_).substr(__p_root_name_size); 
-    return *this; 
-  } 
-  template <class _Source> 
-  _LIBCPP_INLINE_VISIBILITY _EnableIfPathable<_Source> 
-  operator/=(const _Source& __src) { 
-    return operator/=(path(__src)); 
-  } 
- 
-  template <class _Source> 
-  _EnableIfPathable<_Source> append(const _Source& __src) { 
-    return operator/=(path(__src)); 
-  } 
- 
-  template <class _InputIt> 
-  path& append(_InputIt __first, _InputIt __last) { 
-    return operator/=(path(__first, __last)); 
-  } 
-#else 
-  path& operator/=(const path& __p) { 
-    if (__p.is_absolute()) { 
-      __pn_ = __p.__pn_; 
-      return *this; 
-    } 
-    if (has_filename()) 
-      __pn_ += preferred_separator; 
-    __pn_ += __p.native(); 
-    return *this; 
-  } 
- 
-  // FIXME: Use _LIBCPP_DIAGNOSE_WARNING to produce a diagnostic when __src 
-  // is known at compile time to be "/' since the user almost certainly intended 
-  // to append a separator instead of overwriting the path with "/" 
-  template <class _Source> 
-  _LIBCPP_INLINE_VISIBILITY _EnableIfPathable<_Source> 
-  operator/=(const _Source& __src) { 
-    return this->append(__src); 
-  } 
- 
-  template <class _Source> 
-  _EnableIfPathable<_Source> append(const _Source& __src) { 
-    using _Traits = __is_pathable<_Source>; 
-    using _CVT = _PathCVT<_SourceChar<_Source> >; 
-    bool __source_is_absolute = __is_separator(_Traits::__first_or_null(__src)); 
-    if (__source_is_absolute) 
-      __pn_.clear(); 
-    else if (has_filename()) 
-      __pn_ += preferred_separator; 
-    _CVT::__append_source(__pn_, __src); 
-    return *this; 
-  } 
- 
-  template <class _InputIt> 
-  path& append(_InputIt __first, _InputIt __last) { 
-    typedef typename iterator_traits<_InputIt>::value_type _ItVal; 
-    static_assert(__can_convert_char<_ItVal>::value, "Must convertible"); 
-    using _CVT = _PathCVT<_ItVal>; 
-    if (__first != __last && __is_separator(*__first)) 
-      __pn_.clear(); 
-    else if (has_filename()) 
-      __pn_ += preferred_separator; 
-    _CVT::__append_range(__pn_, __first, __last); 
-    return *this; 
-  } 
-#endif 
- 
-  // concatenation 
-  _LIBCPP_INLINE_VISIBILITY 
-  path& operator+=(const path& __x) { 
-    __pn_ += __x.__pn_; 
-    return *this; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  path& operator+=(const string_type& __x) { 
-    __pn_ += __x; 
-    return *this; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  path& operator+=(__string_view __x) { 
-    __pn_ += __x; 
-    return *this; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  path& operator+=(const value_type* __x) { 
-    __pn_ += __x; 
-    return *this; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  path& operator+=(value_type __x) { 
-    __pn_ += __x; 
-    return *this; 
-  } 
- 
-  template <class _ECharT> 
-  typename enable_if<__can_convert_char<_ECharT>::value, path&>::type 
-  operator+=(_ECharT __x) { 
-    _PathCVT<_ECharT>::__append_source(__pn_, 
-                                       basic_string_view<_ECharT>(&__x, 1)); 
-    return *this; 
-  } 
- 
-  template <class _Source> 
-  _EnableIfPathable<_Source> operator+=(const _Source& __x) { 
-    return this->concat(__x); 
-  } 
- 
-  template <class _Source> 
-  _EnableIfPathable<_Source> concat(const _Source& __x) { 
-    _SourceCVT<_Source>::__append_source(__pn_, __x); 
-    return *this; 
-  } 
- 
-  template <class _InputIt> 
-  path& concat(_InputIt __first, _InputIt __last) { 
-    typedef typename iterator_traits<_InputIt>::value_type _ItVal; 
-    _PathCVT<_ItVal>::__append_range(__pn_, __first, __last); 
-    return *this; 
-  } 
- 
-  // modifiers 
-  _LIBCPP_INLINE_VISIBILITY 
-  void clear() noexcept { __pn_.clear(); } 
- 
-  path& make_preferred() { 
-#if defined(_LIBCPP_WIN32API) 
-    _VSTD::replace(__pn_.begin(), __pn_.end(), L'/', L'\\'); 
-#endif 
-    return *this; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  path& remove_filename() { 
-    auto __fname = __filename(); 
-    if (!__fname.empty()) 
-      __pn_.erase(__fname.data() - __pn_.data()); 
-    return *this; 
-  } 
- 
-  path& replace_filename(const path& __replacement) { 
-    remove_filename(); 
-    return (*this /= __replacement); 
-  } 
- 
-  path& replace_extension(const path& __replacement = path()); 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  void swap(path& __rhs) noexcept { __pn_.swap(__rhs.__pn_); } 
- 
-  // private helper to allow reserving memory in the path 
-  _LIBCPP_INLINE_VISIBILITY 
-  void __reserve(size_t __s) { __pn_.reserve(__s); } 
- 
-  // native format observers 
-  _LIBCPP_INLINE_VISIBILITY 
-  const string_type& native() const noexcept { return __pn_; } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  const value_type* c_str() const noexcept { return __pn_.c_str(); } 
- 
-  _LIBCPP_INLINE_VISIBILITY operator string_type() const { return __pn_; } 
- 
-#if defined(_LIBCPP_WIN32API) 
-  _LIBCPP_INLINE_VISIBILITY _VSTD::wstring wstring() const { return __pn_; } 
- 
-  _VSTD::wstring generic_wstring() const { 
-    _VSTD::wstring __s; 
-    __s.resize(__pn_.size()); 
-    _VSTD::replace_copy(__pn_.begin(), __pn_.end(), __s.begin(), '\\', '/'); 
-    return __s; 
-  } 
- 
-#if !defined(_LIBCPP_HAS_NO_LOCALIZATION) 
-  template <class _ECharT, class _Traits = char_traits<_ECharT>, 
-            class _Allocator = allocator<_ECharT> > 
-  basic_string<_ECharT, _Traits, _Allocator> 
-  string(const _Allocator& __a = _Allocator()) const { 
-    using _Str = basic_string<_ECharT, _Traits, _Allocator>; 
-    _Str __s(__a); 
-    __s.reserve(__pn_.size()); 
-    _PathExport<_ECharT>::__append(__s, __pn_); 
-    return __s; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY _VSTD::string string() const { 
-    return string<char>(); 
-  } 
-  _LIBCPP_INLINE_VISIBILITY __u8_string u8string() const { 
-    using _CVT = __narrow_to_utf8<sizeof(wchar_t) * __CHAR_BIT__>; 
-    __u8_string __s; 
-    __s.reserve(__pn_.size()); 
-    _CVT()(back_inserter(__s), __pn_.data(), __pn_.data() + __pn_.size()); 
-    return __s; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY _VSTD::u16string u16string() const { 
-    return string<char16_t>(); 
-  } 
-  _LIBCPP_INLINE_VISIBILITY _VSTD::u32string u32string() const { 
-    return string<char32_t>(); 
-  } 
- 
-  // generic format observers 
-  template <class _ECharT, class _Traits = char_traits<_ECharT>, 
-            class _Allocator = allocator<_ECharT> > 
-  basic_string<_ECharT, _Traits, _Allocator> 
-  generic_string(const _Allocator& __a = _Allocator()) const { 
-    using _Str = basic_string<_ECharT, _Traits, _Allocator>; 
-    _Str __s = string<_ECharT, _Traits, _Allocator>(__a); 
-    // Note: This (and generic_u8string below) is slightly suboptimal as 
-    // it iterates twice over the string; once to convert it to the right 
-    // character type, and once to replace path delimiters. 
-    _VSTD::replace(__s.begin(), __s.end(), 
-                   static_cast<_ECharT>('\\'), static_cast<_ECharT>('/')); 
-    return __s; 
-  } 
- 
-  _VSTD::string generic_string() const { return generic_string<char>(); } 
-  _VSTD::u16string generic_u16string() const { return generic_string<char16_t>(); } 
-  _VSTD::u32string generic_u32string() const { return generic_string<char32_t>(); } 
-  __u8_string generic_u8string() const { 
-    __u8_string __s = u8string(); 
-    _VSTD::replace(__s.begin(), __s.end(), '\\', '/'); 
-    return __s; 
-  } 
-#endif /* !_LIBCPP_HAS_NO_LOCALIZATION */ 
-#else /* _LIBCPP_WIN32API */ 
- 
-  _LIBCPP_INLINE_VISIBILITY _VSTD::string string() const { return __pn_; } 
-#ifndef _LIBCPP_HAS_NO_CHAR8_T 
-  _LIBCPP_INLINE_VISIBILITY _VSTD::u8string u8string() const { return _VSTD::u8string(__pn_.begin(), __pn_.end()); } 
-#else 
-  _LIBCPP_INLINE_VISIBILITY _VSTD::string u8string() const { return __pn_; } 
-#endif 
- 
-#if !defined(_LIBCPP_HAS_NO_LOCALIZATION) 
-  template <class _ECharT, class _Traits = char_traits<_ECharT>, 
-            class _Allocator = allocator<_ECharT> > 
-  basic_string<_ECharT, _Traits, _Allocator> 
-  string(const _Allocator& __a = _Allocator()) const { 
-    using _CVT = __widen_from_utf8<sizeof(_ECharT) * __CHAR_BIT__>; 
-    using _Str = basic_string<_ECharT, _Traits, _Allocator>; 
-    _Str __s(__a); 
-    __s.reserve(__pn_.size()); 
-    _CVT()(back_inserter(__s), __pn_.data(), __pn_.data() + __pn_.size()); 
-    return __s; 
-  } 
- 
-#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS 
-  _LIBCPP_INLINE_VISIBILITY _VSTD::wstring wstring() const { 
-    return string<wchar_t>(); 
-  } 
-#endif 
-  _LIBCPP_INLINE_VISIBILITY _VSTD::u16string u16string() const { 
-    return string<char16_t>(); 
-  } 
-  _LIBCPP_INLINE_VISIBILITY _VSTD::u32string u32string() const { 
-    return string<char32_t>(); 
-  } 
-#endif /* !_LIBCPP_HAS_NO_LOCALIZATION */ 
- 
-  // generic format observers 
-  _VSTD::string generic_string() const { return __pn_; } 
-#ifndef _LIBCPP_HAS_NO_CHAR8_T 
-  _VSTD::u8string generic_u8string() const { return _VSTD::u8string(__pn_.begin(), __pn_.end()); } 
-#else 
-  _VSTD::string generic_u8string() const { return __pn_; } 
-#endif 
- 
-#if !defined(_LIBCPP_HAS_NO_LOCALIZATION) 
-  template <class _ECharT, class _Traits = char_traits<_ECharT>, 
-            class _Allocator = allocator<_ECharT> > 
-  basic_string<_ECharT, _Traits, _Allocator> 
-  generic_string(const _Allocator& __a = _Allocator()) const { 
-    return string<_ECharT, _Traits, _Allocator>(__a); 
-  } 
- 
-#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS 
-  _VSTD::wstring generic_wstring() const { return string<wchar_t>(); } 
-#endif 
-  _VSTD::u16string generic_u16string() const { return string<char16_t>(); } 
-  _VSTD::u32string generic_u32string() const { return string<char32_t>(); } 
-#endif /* !_LIBCPP_HAS_NO_LOCALIZATION */ 
-#endif /* !_LIBCPP_WIN32API */ 
- 
-private: 
-  int __compare(__string_view) const; 
-  __string_view __root_name() const; 
-  __string_view __root_directory() const; 
-  __string_view __root_path_raw() const; 
-  __string_view __relative_path() const; 
-  __string_view __parent_path() const; 
-  __string_view __filename() const; 
-  __string_view __stem() const; 
-  __string_view __extension() const; 
- 
-public: 
-  // compare 
-  _LIBCPP_INLINE_VISIBILITY int compare(const path& __p) const noexcept { 
-    return __compare(__p.__pn_); 
-  } 
-  _LIBCPP_INLINE_VISIBILITY int compare(const string_type& __s) const { 
-    return __compare(__s); 
-  } 
-  _LIBCPP_INLINE_VISIBILITY int compare(__string_view __s) const { 
-    return __compare(__s); 
-  } 
-  _LIBCPP_INLINE_VISIBILITY int compare(const value_type* __s) const { 
-    return __compare(__s); 
-  } 
- 
-  // decomposition 
-  _LIBCPP_INLINE_VISIBILITY path root_name() const { 
-    return string_type(__root_name()); 
-  } 
-  _LIBCPP_INLINE_VISIBILITY path root_directory() const { 
-    return string_type(__root_directory()); 
-  } 
-  _LIBCPP_INLINE_VISIBILITY path root_path() const { 
-#if defined(_LIBCPP_WIN32API) 
-    return string_type(__root_path_raw()); 
-#else 
-    return root_name().append(string_type(__root_directory())); 
-#endif 
-  } 
-  _LIBCPP_INLINE_VISIBILITY path relative_path() const { 
-    return string_type(__relative_path()); 
-  } 
-  _LIBCPP_INLINE_VISIBILITY path parent_path() const { 
-    return string_type(__parent_path()); 
-  } 
-  _LIBCPP_INLINE_VISIBILITY path filename() const { 
-    return string_type(__filename()); 
-  } 
-  _LIBCPP_INLINE_VISIBILITY path stem() const { return string_type(__stem()); } 
-  _LIBCPP_INLINE_VISIBILITY path extension() const { 
-    return string_type(__extension()); 
-  } 
- 
-  // query 
-  _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY bool 
-  empty() const noexcept { 
-    return __pn_.empty(); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY bool has_root_name() const { 
-    return !__root_name().empty(); 
-  } 
-  _LIBCPP_INLINE_VISIBILITY bool has_root_directory() const { 
-    return !__root_directory().empty(); 
-  } 
-  _LIBCPP_INLINE_VISIBILITY bool has_root_path() const { 
-    return !__root_path_raw().empty(); 
-  } 
-  _LIBCPP_INLINE_VISIBILITY bool has_relative_path() const { 
-    return !__relative_path().empty(); 
-  } 
-  _LIBCPP_INLINE_VISIBILITY bool has_parent_path() const { 
-    return !__parent_path().empty(); 
-  } 
-  _LIBCPP_INLINE_VISIBILITY bool has_filename() const { 
-    return !__filename().empty(); 
-  } 
-  _LIBCPP_INLINE_VISIBILITY bool has_stem() const { return !__stem().empty(); } 
-  _LIBCPP_INLINE_VISIBILITY bool has_extension() const { 
-    return !__extension().empty(); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY bool is_absolute() const { 
-#if defined(_LIBCPP_WIN32API) 
-    __string_view __root_name_str = __root_name(); 
-    __string_view __root_dir = __root_directory(); 
-    if (__root_name_str.size() == 2 && __root_name_str[1] == ':') { 
-      // A drive letter with no root directory is relative, e.g. x:example. 
-      return !__root_dir.empty(); 
-    } 
-    // If no root name, it's relative, e.g. \example is relative to the current drive 
-    if (__root_name_str.empty()) 
-      return false; 
-    if (__root_name_str.size() < 3) 
-      return false; 
-    // A server root name, like \\server, is always absolute 
-    if (__root_name_str[0] != '/' && __root_name_str[0] != '\\') 
-      return false; 
-    if (__root_name_str[1] != '/' && __root_name_str[1] != '\\') 
-      return false; 
-    // Seems to be a server root name 
-    return true; 
-#else 
-    return has_root_directory(); 
-#endif 
-  } 
-  _LIBCPP_INLINE_VISIBILITY bool is_relative() const { return !is_absolute(); } 
- 
-  // relative paths 
-  path lexically_normal() const; 
-  path lexically_relative(const path& __base) const; 
- 
-  _LIBCPP_INLINE_VISIBILITY path lexically_proximate(const path& __base) const { 
-    path __result = this->lexically_relative(__base); 
-    if (__result.native().empty()) 
-      return *this; 
-    return __result; 
-  } 
- 
-  // iterators 
-  class _LIBCPP_TYPE_VIS iterator; 
-  typedef iterator const_iterator; 
- 
-  iterator begin() const; 
-  iterator end() const; 
- 
-#if !defined(_LIBCPP_HAS_NO_LOCALIZATION) 
-  template <class _CharT, class _Traits> 
-  _LIBCPP_INLINE_VISIBILITY friend 
-      typename enable_if<is_same<_CharT, value_type>::value && 
-                             is_same<_Traits, char_traits<value_type> >::value, 
-                         basic_ostream<_CharT, _Traits>&>::type 
-      operator<<(basic_ostream<_CharT, _Traits>& __os, const path& __p) { 
-    __os << _VSTD::__quoted(__p.native()); 
-    return __os; 
-  } 
- 
-  template <class _CharT, class _Traits> 
-  _LIBCPP_INLINE_VISIBILITY friend 
-      typename enable_if<!is_same<_CharT, value_type>::value || 
-                             !is_same<_Traits, char_traits<value_type> >::value, 
-                         basic_ostream<_CharT, _Traits>&>::type 
-      operator<<(basic_ostream<_CharT, _Traits>& __os, const path& __p) { 
-    __os << _VSTD::__quoted(__p.string<_CharT, _Traits>()); 
-    return __os; 
-  } 
- 
-  template <class _CharT, class _Traits> 
-  _LIBCPP_INLINE_VISIBILITY friend basic_istream<_CharT, _Traits>& 
-  operator>>(basic_istream<_CharT, _Traits>& __is, path& __p) { 
-    basic_string<_CharT, _Traits> __tmp; 
-    __is >> __quoted(__tmp); 
-    __p = __tmp; 
-    return __is; 
-  } 
-#endif // !_LIBCPP_HAS_NO_LOCALIZATION 
- 
+
+#if !defined(_LIBCPP_HAS_NO_LOCALIZATION)
+# include <locale>
+# include <iomanip> // for quoted
+#endif
+
+#if defined(_LIBCPP_HAS_NO_FILESYSTEM_LIBRARY)
+# error "The Filesystem library is not supported since libc++ has been configured with LIBCXX_ENABLE_FILESYSTEM disabled"
+#endif
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+_LIBCPP_PUSH_MACROS
+
+#ifdef _LIBCPP_COMPILER_MSVC
+#pragma warning ( push )
+#pragma warning ( disable : 4141 )
+#endif
+
+#include <__undef_macros>
+
+#ifndef _LIBCPP_CXX03_LANG
+
+_LIBCPP_BEGIN_NAMESPACE_FILESYSTEM
+
+_LIBCPP_AVAILABILITY_FILESYSTEM_PUSH
+
+typedef chrono::time_point<_FilesystemClock> file_time_type;
+
+struct _LIBCPP_TYPE_VIS space_info {
+  uintmax_t capacity;
+  uintmax_t free;
+  uintmax_t available;
+};
+
+// On Windows, the library never identifies files as block, character, fifo
+// or socket.
+enum class _LIBCPP_ENUM_VIS file_type : signed char {
+  none = 0,
+  not_found = -1,
+  regular = 1,
+  directory = 2,
+  symlink = 3,
+  block = 4,
+  character = 5,
+  fifo = 6,
+  socket = 7,
+  unknown = 8
+};
+
+// On Windows, these permission bits map to one single readonly flag per
+// file, and the executable bit is always returned as set. When setting
+// permissions, as long as the write bit is set for either owner, group or
+// others, the readonly flag is cleared.
+enum class _LIBCPP_ENUM_VIS perms : unsigned {
+  none = 0,
+
+  owner_read = 0400,
+  owner_write = 0200,
+  owner_exec = 0100,
+  owner_all = 0700,
+
+  group_read = 040,
+  group_write = 020,
+  group_exec = 010,
+  group_all = 070,
+
+  others_read = 04,
+  others_write = 02,
+  others_exec = 01,
+  others_all = 07,
+
+  all = 0777,
+
+  set_uid = 04000,
+  set_gid = 02000,
+  sticky_bit = 01000,
+  mask = 07777,
+  unknown = 0xFFFF,
+};
+
+_LIBCPP_INLINE_VISIBILITY
+inline constexpr perms operator&(perms _LHS, perms _RHS) {
+  return static_cast<perms>(static_cast<unsigned>(_LHS) &
+                            static_cast<unsigned>(_RHS));
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline constexpr perms operator|(perms _LHS, perms _RHS) {
+  return static_cast<perms>(static_cast<unsigned>(_LHS) |
+                            static_cast<unsigned>(_RHS));
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline constexpr perms operator^(perms _LHS, perms _RHS) {
+  return static_cast<perms>(static_cast<unsigned>(_LHS) ^
+                            static_cast<unsigned>(_RHS));
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline constexpr perms operator~(perms _LHS) {
+  return static_cast<perms>(~static_cast<unsigned>(_LHS));
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline perms& operator&=(perms& _LHS, perms _RHS) { return _LHS = _LHS & _RHS; }
+
+_LIBCPP_INLINE_VISIBILITY
+inline perms& operator|=(perms& _LHS, perms _RHS) { return _LHS = _LHS | _RHS; }
+
+_LIBCPP_INLINE_VISIBILITY
+inline perms& operator^=(perms& _LHS, perms _RHS) { return _LHS = _LHS ^ _RHS; }
+
+enum class _LIBCPP_ENUM_VIS perm_options : unsigned char {
+  replace = 1,
+  add = 2,
+  remove = 4,
+  nofollow = 8
+};
+
+_LIBCPP_INLINE_VISIBILITY
+inline constexpr perm_options operator&(perm_options _LHS, perm_options _RHS) {
+  return static_cast<perm_options>(static_cast<unsigned>(_LHS) &
+                                   static_cast<unsigned>(_RHS));
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline constexpr perm_options operator|(perm_options _LHS, perm_options _RHS) {
+  return static_cast<perm_options>(static_cast<unsigned>(_LHS) |
+                                   static_cast<unsigned>(_RHS));
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline constexpr perm_options operator^(perm_options _LHS, perm_options _RHS) {
+  return static_cast<perm_options>(static_cast<unsigned>(_LHS) ^
+                                   static_cast<unsigned>(_RHS));
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline constexpr perm_options operator~(perm_options _LHS) {
+  return static_cast<perm_options>(~static_cast<unsigned>(_LHS));
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline perm_options& operator&=(perm_options& _LHS, perm_options _RHS) {
+  return _LHS = _LHS & _RHS;
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline perm_options& operator|=(perm_options& _LHS, perm_options _RHS) {
+  return _LHS = _LHS | _RHS;
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline perm_options& operator^=(perm_options& _LHS, perm_options _RHS) {
+  return _LHS = _LHS ^ _RHS;
+}
+
+enum class _LIBCPP_ENUM_VIS copy_options : unsigned short {
+  none = 0,
+  skip_existing = 1,
+  overwrite_existing = 2,
+  update_existing = 4,
+  recursive = 8,
+  copy_symlinks = 16,
+  skip_symlinks = 32,
+  directories_only = 64,
+  create_symlinks = 128,
+  create_hard_links = 256,
+  __in_recursive_copy = 512,
+};
+
+_LIBCPP_INLINE_VISIBILITY
+inline constexpr copy_options operator&(copy_options _LHS, copy_options _RHS) {
+  return static_cast<copy_options>(static_cast<unsigned short>(_LHS) &
+                                   static_cast<unsigned short>(_RHS));
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline constexpr copy_options operator|(copy_options _LHS, copy_options _RHS) {
+  return static_cast<copy_options>(static_cast<unsigned short>(_LHS) |
+                                   static_cast<unsigned short>(_RHS));
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline constexpr copy_options operator^(copy_options _LHS, copy_options _RHS) {
+  return static_cast<copy_options>(static_cast<unsigned short>(_LHS) ^
+                                   static_cast<unsigned short>(_RHS));
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline constexpr copy_options operator~(copy_options _LHS) {
+  return static_cast<copy_options>(~static_cast<unsigned short>(_LHS));
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline copy_options& operator&=(copy_options& _LHS, copy_options _RHS) {
+  return _LHS = _LHS & _RHS;
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline copy_options& operator|=(copy_options& _LHS, copy_options _RHS) {
+  return _LHS = _LHS | _RHS;
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline copy_options& operator^=(copy_options& _LHS, copy_options _RHS) {
+  return _LHS = _LHS ^ _RHS;
+}
+
+enum class _LIBCPP_ENUM_VIS directory_options : unsigned char {
+  none = 0,
+  follow_directory_symlink = 1,
+  skip_permission_denied = 2
+};
+
+_LIBCPP_INLINE_VISIBILITY
+inline constexpr directory_options operator&(directory_options _LHS,
+                                             directory_options _RHS) {
+  return static_cast<directory_options>(static_cast<unsigned char>(_LHS) &
+                                        static_cast<unsigned char>(_RHS));
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline constexpr directory_options operator|(directory_options _LHS,
+                                             directory_options _RHS) {
+  return static_cast<directory_options>(static_cast<unsigned char>(_LHS) |
+                                        static_cast<unsigned char>(_RHS));
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline constexpr directory_options operator^(directory_options _LHS,
+                                             directory_options _RHS) {
+  return static_cast<directory_options>(static_cast<unsigned char>(_LHS) ^
+                                        static_cast<unsigned char>(_RHS));
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline constexpr directory_options operator~(directory_options _LHS) {
+  return static_cast<directory_options>(~static_cast<unsigned char>(_LHS));
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline directory_options& operator&=(directory_options& _LHS,
+                                     directory_options _RHS) {
+  return _LHS = _LHS & _RHS;
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline directory_options& operator|=(directory_options& _LHS,
+                                     directory_options _RHS) {
+  return _LHS = _LHS | _RHS;
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline directory_options& operator^=(directory_options& _LHS,
+                                     directory_options _RHS) {
+  return _LHS = _LHS ^ _RHS;
+}
+
+class _LIBCPP_TYPE_VIS file_status {
+public:
+  // constructors
+  _LIBCPP_INLINE_VISIBILITY
+  file_status() noexcept : file_status(file_type::none) {}
+  _LIBCPP_INLINE_VISIBILITY
+  explicit file_status(file_type __ft, perms __prms = perms::unknown) noexcept
+      : __ft_(__ft),
+        __prms_(__prms) {}
+
+  file_status(const file_status&) noexcept = default;
+  file_status(file_status&&) noexcept = default;
+
+  _LIBCPP_INLINE_VISIBILITY
+  ~file_status() {}
+
+  file_status& operator=(const file_status&) noexcept = default;
+  file_status& operator=(file_status&&) noexcept = default;
+
+  // observers
+  _LIBCPP_INLINE_VISIBILITY
+  file_type type() const noexcept { return __ft_; }
+
+  _LIBCPP_INLINE_VISIBILITY
+  perms permissions() const noexcept { return __prms_; }
+
+  // modifiers
+  _LIBCPP_INLINE_VISIBILITY
+  void type(file_type __ft) noexcept { __ft_ = __ft; }
+
+  _LIBCPP_INLINE_VISIBILITY
+  void permissions(perms __p) noexcept { __prms_ = __p; }
+
+private:
+  file_type __ft_;
+  perms __prms_;
+};
+
+class _LIBCPP_TYPE_VIS directory_entry;
+
+template <class _Tp>
+struct __can_convert_char {
+  static const bool value = false;
+};
+template <class _Tp>
+struct __can_convert_char<const _Tp> : public __can_convert_char<_Tp> {};
+template <>
+struct __can_convert_char<char> {
+  static const bool value = true;
+  using __char_type = char;
+};
+template <>
+struct __can_convert_char<wchar_t> {
+  static const bool value = true;
+  using __char_type = wchar_t;
+};
+#ifndef _LIBCPP_HAS_NO_CHAR8_T
+template <>
+struct __can_convert_char<char8_t> {
+  static const bool value = true;
+  using __char_type = char8_t;
+};
+#endif
+template <>
+struct __can_convert_char<char16_t> {
+  static const bool value = true;
+  using __char_type = char16_t;
+};
+template <>
+struct __can_convert_char<char32_t> {
+  static const bool value = true;
+  using __char_type = char32_t;
+};
+
+template <class _ECharT>
+typename enable_if<__can_convert_char<_ECharT>::value, bool>::type
+__is_separator(_ECharT __e) {
+#if defined(_LIBCPP_WIN32API)
+  return __e == _ECharT('/') || __e == _ECharT('\\');
+#else
+  return __e == _ECharT('/');
+#endif
+}
+
+#ifndef _LIBCPP_HAS_NO_CHAR8_T
+typedef u8string __u8_string;
+#else
+typedef string __u8_string;
+#endif
+
+struct _NullSentinel {};
+
+template <class _Tp>
+using _Void = void;
+
+template <class _Tp, class = void>
+struct __is_pathable_string : public false_type {};
+
+template <class _ECharT, class _Traits, class _Alloc>
+struct __is_pathable_string<
+    basic_string<_ECharT, _Traits, _Alloc>,
+    _Void<typename __can_convert_char<_ECharT>::__char_type> >
+    : public __can_convert_char<_ECharT> {
+  using _Str = basic_string<_ECharT, _Traits, _Alloc>;
+  using _Base = __can_convert_char<_ECharT>;
+  static _ECharT const* __range_begin(_Str const& __s) { return __s.data(); }
+  static _ECharT const* __range_end(_Str const& __s) {
+    return __s.data() + __s.length();
+  }
+  static _ECharT __first_or_null(_Str const& __s) {
+    return __s.empty() ? _ECharT{} : __s[0];
+  }
+};
+
+template <class _ECharT, class _Traits>
+struct __is_pathable_string<
+    basic_string_view<_ECharT, _Traits>,
+    _Void<typename __can_convert_char<_ECharT>::__char_type> >
+    : public __can_convert_char<_ECharT> {
+  using _Str = basic_string_view<_ECharT, _Traits>;
+  using _Base = __can_convert_char<_ECharT>;
+  static _ECharT const* __range_begin(_Str const& __s) { return __s.data(); }
+  static _ECharT const* __range_end(_Str const& __s) {
+    return __s.data() + __s.length();
+  }
+  static _ECharT __first_or_null(_Str const& __s) {
+    return __s.empty() ? _ECharT{} : __s[0];
+  }
+};
+
+template <class _Source, class _DS = typename decay<_Source>::type,
+          class _UnqualPtrType =
+              typename remove_const<typename remove_pointer<_DS>::type>::type,
+          bool _IsCharPtr = is_pointer<_DS>::value&&
+              __can_convert_char<_UnqualPtrType>::value>
+struct __is_pathable_char_array : false_type {};
+
+template <class _Source, class _ECharT, class _UPtr>
+struct __is_pathable_char_array<_Source, _ECharT*, _UPtr, true>
+    : __can_convert_char<typename remove_const<_ECharT>::type> {
+  using _Base = __can_convert_char<typename remove_const<_ECharT>::type>;
+
+  static _ECharT const* __range_begin(const _ECharT* __b) { return __b; }
+  static _ECharT const* __range_end(const _ECharT* __b) {
+    using _Iter = const _ECharT*;
+    const _ECharT __sentinel = _ECharT{};
+    _Iter __e = __b;
+    for (; *__e != __sentinel; ++__e)
+      ;
+    return __e;
+  }
+
+  static _ECharT __first_or_null(const _ECharT* __b) { return *__b; }
+};
+
+template <class _Iter, bool _IsIt = __is_cpp17_input_iterator<_Iter>::value,
+          class = void>
+struct __is_pathable_iter : false_type {};
+
+template <class _Iter>
+struct __is_pathable_iter<
+    _Iter, true,
+    _Void<typename __can_convert_char<
+        typename iterator_traits<_Iter>::value_type>::__char_type> >
+    : __can_convert_char<typename iterator_traits<_Iter>::value_type> {
+  using _ECharT = typename iterator_traits<_Iter>::value_type;
+  using _Base = __can_convert_char<_ECharT>;
+
+  static _Iter __range_begin(_Iter __b) { return __b; }
+  static _NullSentinel __range_end(_Iter) { return _NullSentinel{}; }
+
+  static _ECharT __first_or_null(_Iter __b) { return *__b; }
+};
+
+template <class _Tp, bool _IsStringT = __is_pathable_string<_Tp>::value,
+          bool _IsCharIterT = __is_pathable_char_array<_Tp>::value,
+          bool _IsIterT = !_IsCharIterT && __is_pathable_iter<_Tp>::value>
+struct __is_pathable : false_type {
+  static_assert(!_IsStringT && !_IsCharIterT && !_IsIterT, "Must all be false");
+};
+
+template <class _Tp>
+struct __is_pathable<_Tp, true, false, false> : __is_pathable_string<_Tp> {};
+
+template <class _Tp>
+struct __is_pathable<_Tp, false, true, false> : __is_pathable_char_array<_Tp> {
+};
+
+template <class _Tp>
+struct __is_pathable<_Tp, false, false, true> : __is_pathable_iter<_Tp> {};
+
+#if defined(_LIBCPP_WIN32API)
+typedef wstring __path_string;
+typedef wchar_t __path_value;
+#else
+typedef string __path_string;
+typedef char __path_value;
+#endif
+
+#if defined(_LIBCPP_WIN32API)
+_LIBCPP_FUNC_VIS
+size_t __wide_to_char(const wstring&, char*, size_t);
+_LIBCPP_FUNC_VIS
+size_t __char_to_wide(const string&, wchar_t*, size_t);
+#endif
+
+template <class _ECharT>
+struct _PathCVT;
+
+#if !defined(_LIBCPP_HAS_NO_LOCALIZATION)
+template <class _ECharT>
+struct _PathCVT {
+  static_assert(__can_convert_char<_ECharT>::value,
+                "Char type not convertible");
+
+  typedef __narrow_to_utf8<sizeof(_ECharT) * __CHAR_BIT__> _Narrower;
+#if defined(_LIBCPP_WIN32API)
+  typedef __widen_from_utf8<sizeof(wchar_t) * __CHAR_BIT__> _Widener;
+#endif
+
+  static void __append_range(__path_string& __dest, _ECharT const* __b,
+                             _ECharT const* __e) {
+#if defined(_LIBCPP_WIN32API)
+    string __utf8;
+    _Narrower()(back_inserter(__utf8), __b, __e);
+    _Widener()(back_inserter(__dest), __utf8.data(), __utf8.data() + __utf8.size());
+#else
+    _Narrower()(back_inserter(__dest), __b, __e);
+#endif
+  }
+
+  template <class _Iter>
+  static void __append_range(__path_string& __dest, _Iter __b, _Iter __e) {
+    static_assert(!is_same<_Iter, _ECharT*>::value, "Call const overload");
+    if (__b == __e)
+      return;
+    basic_string<_ECharT> __tmp(__b, __e);
+#if defined(_LIBCPP_WIN32API)
+    string __utf8;
+    _Narrower()(back_inserter(__utf8), __tmp.data(),
+                __tmp.data() + __tmp.length());
+    _Widener()(back_inserter(__dest), __utf8.data(), __utf8.data() + __utf8.size());
+#else
+    _Narrower()(back_inserter(__dest), __tmp.data(),
+                __tmp.data() + __tmp.length());
+#endif
+  }
+
+  template <class _Iter>
+  static void __append_range(__path_string& __dest, _Iter __b, _NullSentinel) {
+    static_assert(!is_same<_Iter, _ECharT*>::value, "Call const overload");
+    const _ECharT __sentinel = _ECharT{};
+    if (*__b == __sentinel)
+      return;
+    basic_string<_ECharT> __tmp;
+    for (; *__b != __sentinel; ++__b)
+      __tmp.push_back(*__b);
+#if defined(_LIBCPP_WIN32API)
+    string __utf8;
+    _Narrower()(back_inserter(__utf8), __tmp.data(),
+                __tmp.data() + __tmp.length());
+    _Widener()(back_inserter(__dest), __utf8.data(), __utf8.data() + __utf8.size());
+#else
+    _Narrower()(back_inserter(__dest), __tmp.data(),
+                __tmp.data() + __tmp.length());
+#endif
+  }
+
+  template <class _Source>
+  static void __append_source(__path_string& __dest, _Source const& __s) {
+    using _Traits = __is_pathable<_Source>;
+    __append_range(__dest, _Traits::__range_begin(__s),
+                   _Traits::__range_end(__s));
+  }
+};
+#endif // !_LIBCPP_HAS_NO_LOCALIZATION
+
+template <>
+struct _PathCVT<__path_value> {
+
+  template <class _Iter>
+  static typename enable_if<__is_exactly_cpp17_input_iterator<_Iter>::value>::type
+  __append_range(__path_string& __dest, _Iter __b, _Iter __e) {
+    for (; __b != __e; ++__b)
+      __dest.push_back(*__b);
+  }
+
+  template <class _Iter>
+  static typename enable_if<__is_cpp17_forward_iterator<_Iter>::value>::type
+  __append_range(__path_string& __dest, _Iter __b, _Iter __e) {
+    __dest.append(__b, __e);
+  }
+
+  template <class _Iter>
+  static void __append_range(__path_string& __dest, _Iter __b, _NullSentinel) {
+    const char __sentinel = char{};
+    for (; *__b != __sentinel; ++__b)
+      __dest.push_back(*__b);
+  }
+
+  template <class _Source>
+  static void __append_source(__path_string& __dest, _Source const& __s) {
+    using _Traits = __is_pathable<_Source>;
+    __append_range(__dest, _Traits::__range_begin(__s),
+                   _Traits::__range_end(__s));
+  }
+};
+
+#if defined(_LIBCPP_WIN32API)
+template <>
+struct _PathCVT<char> {
+
+  static void
+  __append_string(__path_string& __dest, const basic_string<char> &__str) {
+      size_t __size = __char_to_wide(__str, nullptr, 0);
+      size_t __pos = __dest.size();
+      __dest.resize(__pos + __size);
+      __char_to_wide(__str, const_cast<__path_value*>(__dest.data()) + __pos, __size);
+  }
+
+  template <class _Iter>
+  static typename enable_if<__is_exactly_cpp17_input_iterator<_Iter>::value>::type
+  __append_range(__path_string& __dest, _Iter __b, _Iter __e) {
+    basic_string<char> __tmp(__b, __e);
+    __append_string(__dest, __tmp);
+  }
+
+  template <class _Iter>
+  static typename enable_if<__is_cpp17_forward_iterator<_Iter>::value>::type
+  __append_range(__path_string& __dest, _Iter __b, _Iter __e) {
+    basic_string<char> __tmp(__b, __e);
+    __append_string(__dest, __tmp);
+  }
+
+  template <class _Iter>
+  static void __append_range(__path_string& __dest, _Iter __b, _NullSentinel) {
+    const char __sentinel = char{};
+    basic_string<char> __tmp;
+    for (; *__b != __sentinel; ++__b)
+      __tmp.push_back(*__b);
+    __append_string(__dest, __tmp);
+  }
+
+  template <class _Source>
+  static void __append_source(__path_string& __dest, _Source const& __s) {
+    using _Traits = __is_pathable<_Source>;
+    __append_range(__dest, _Traits::__range_begin(__s),
+                   _Traits::__range_end(__s));
+  }
+};
+
+template <class _ECharT>
+struct _PathExport {
+  typedef __narrow_to_utf8<sizeof(wchar_t) * __CHAR_BIT__> _Narrower;
+  typedef __widen_from_utf8<sizeof(_ECharT) * __CHAR_BIT__> _Widener;
+
+  template <class _Str>
+  static void __append(_Str& __dest, const __path_string& __src) {
+    string __utf8;
+    _Narrower()(back_inserter(__utf8), __src.data(), __src.data() + __src.size());
+    _Widener()(back_inserter(__dest), __utf8.data(), __utf8.data() + __utf8.size());
+  }
+};
+
+template <>
+struct _PathExport<char> {
+  template <class _Str>
+  static void __append(_Str& __dest, const __path_string& __src) {
+    size_t __size = __wide_to_char(__src, nullptr, 0);
+    size_t __pos = __dest.size();
+    __dest.resize(__size);
+    __wide_to_char(__src, const_cast<char*>(__dest.data()) + __pos, __size);
+  }
+};
+
+template <>
+struct _PathExport<wchar_t> {
+  template <class _Str>
+  static void __append(_Str& __dest, const __path_string& __src) {
+    __dest.append(__src.begin(), __src.end());
+  }
+};
+
+template <>
+struct _PathExport<char16_t> {
+  template <class _Str>
+  static void __append(_Str& __dest, const __path_string& __src) {
+    __dest.append(__src.begin(), __src.end());
+  }
+};
+
+#ifndef _LIBCPP_HAS_NO_CHAR8_T
+template <>
+struct _PathExport<char8_t> {
+  typedef __narrow_to_utf8<sizeof(wchar_t) * __CHAR_BIT__> _Narrower;
+
+  template <class _Str>
+  static void __append(_Str& __dest, const __path_string& __src) {
+    _Narrower()(back_inserter(__dest), __src.data(), __src.data() + __src.size());
+  }
+};
+#endif /* !_LIBCPP_HAS_NO_CHAR8_T */
+#endif /* _LIBCPP_WIN32API */
+
+class _LIBCPP_TYPE_VIS path {
+  template <class _SourceOrIter, class _Tp = path&>
+  using _EnableIfPathable =
+      typename enable_if<__is_pathable<_SourceOrIter>::value, _Tp>::type;
+
+  template <class _Tp>
+  using _SourceChar = typename __is_pathable<_Tp>::__char_type;
+
+  template <class _Tp>
+  using _SourceCVT = _PathCVT<_SourceChar<_Tp> >;
+
+public:
+#if defined(_LIBCPP_WIN32API)
+  typedef wchar_t value_type;
+  static constexpr value_type preferred_separator = L'\\';
+#else
+  typedef char value_type;
+  static constexpr value_type preferred_separator = '/';
+#endif
+  typedef basic_string<value_type> string_type;
+  typedef basic_string_view<value_type> __string_view;
+
+  enum _LIBCPP_ENUM_VIS format : unsigned char {
+    auto_format,
+    native_format,
+    generic_format
+  };
+
+  // constructors and destructor
+  _LIBCPP_INLINE_VISIBILITY path() noexcept {}
+  _LIBCPP_INLINE_VISIBILITY path(const path& __p) : __pn_(__p.__pn_) {}
+  _LIBCPP_INLINE_VISIBILITY path(path&& __p) noexcept
+      : __pn_(_VSTD::move(__p.__pn_)) {}
+
+  _LIBCPP_INLINE_VISIBILITY
+  path(string_type&& __s, format = format::auto_format) noexcept
+      : __pn_(_VSTD::move(__s)) {}
+
+  template <class _Source, class = _EnableIfPathable<_Source, void> >
+  path(const _Source& __src, format = format::auto_format) {
+    _SourceCVT<_Source>::__append_source(__pn_, __src);
+  }
+
+  template <class _InputIt>
+  path(_InputIt __first, _InputIt __last, format = format::auto_format) {
+    typedef typename iterator_traits<_InputIt>::value_type _ItVal;
+    _PathCVT<_ItVal>::__append_range(__pn_, __first, __last);
+  }
+
+#if !defined(_LIBCPP_HAS_NO_LOCALIZATION)
+  // TODO Implement locale conversions.
+  template <class _Source, class = _EnableIfPathable<_Source, void> >
+  path(const _Source& __src, const locale& __loc, format = format::auto_format);
+  template <class _InputIt>
+  path(_InputIt __first, _InputIt _last, const locale& __loc,
+       format = format::auto_format);
+#endif
+
+  _LIBCPP_INLINE_VISIBILITY
+  ~path() = default;
+
+  // assignments
+  _LIBCPP_INLINE_VISIBILITY
+  path& operator=(const path& __p) {
+    __pn_ = __p.__pn_;
+    return *this;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  path& operator=(path&& __p) noexcept {
+    __pn_ = _VSTD::move(__p.__pn_);
+    return *this;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  path& operator=(string_type&& __s) noexcept {
+    __pn_ = _VSTD::move(__s);
+    return *this;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  path& assign(string_type&& __s) noexcept {
+    __pn_ = _VSTD::move(__s);
+    return *this;
+  }
+
+  template <class _Source>
+  _LIBCPP_INLINE_VISIBILITY _EnableIfPathable<_Source>
+  operator=(const _Source& __src) {
+    return this->assign(__src);
+  }
+
+  template <class _Source>
+  _EnableIfPathable<_Source> assign(const _Source& __src) {
+    __pn_.clear();
+    _SourceCVT<_Source>::__append_source(__pn_, __src);
+    return *this;
+  }
+
+  template <class _InputIt>
+  path& assign(_InputIt __first, _InputIt __last) {
+    typedef typename iterator_traits<_InputIt>::value_type _ItVal;
+    __pn_.clear();
+    _PathCVT<_ItVal>::__append_range(__pn_, __first, __last);
+    return *this;
+  }
+
+public:
+  // appends
+#if defined(_LIBCPP_WIN32API)
+  path& operator/=(const path& __p) {
+    auto __p_root_name = __p.__root_name();
+    auto __p_root_name_size = __p_root_name.size();
+    if (__p.is_absolute() ||
+        (!__p_root_name.empty() && __p_root_name != root_name())) {
+      __pn_ = __p.__pn_;
+      return *this;
+    }
+    if (__p.has_root_directory()) {
+      path __root_name_str = root_name();
+      __pn_ = __root_name_str.native();
+      __pn_ += __string_view(__p.__pn_).substr(__p_root_name_size);
+      return *this;
+    }
+    if (has_filename() || (!has_root_directory() && is_absolute()))
+      __pn_ += preferred_separator;
+    __pn_ += __string_view(__p.__pn_).substr(__p_root_name_size);
+    return *this;
+  }
+  template <class _Source>
+  _LIBCPP_INLINE_VISIBILITY _EnableIfPathable<_Source>
+  operator/=(const _Source& __src) {
+    return operator/=(path(__src));
+  }
+
+  template <class _Source>
+  _EnableIfPathable<_Source> append(const _Source& __src) {
+    return operator/=(path(__src));
+  }
+
+  template <class _InputIt>
+  path& append(_InputIt __first, _InputIt __last) {
+    return operator/=(path(__first, __last));
+  }
+#else
+  path& operator/=(const path& __p) {
+    if (__p.is_absolute()) {
+      __pn_ = __p.__pn_;
+      return *this;
+    }
+    if (has_filename())
+      __pn_ += preferred_separator;
+    __pn_ += __p.native();
+    return *this;
+  }
+
+  // FIXME: Use _LIBCPP_DIAGNOSE_WARNING to produce a diagnostic when __src
+  // is known at compile time to be "/' since the user almost certainly intended
+  // to append a separator instead of overwriting the path with "/"
+  template <class _Source>
+  _LIBCPP_INLINE_VISIBILITY _EnableIfPathable<_Source>
+  operator/=(const _Source& __src) {
+    return this->append(__src);
+  }
+
+  template <class _Source>
+  _EnableIfPathable<_Source> append(const _Source& __src) {
+    using _Traits = __is_pathable<_Source>;
+    using _CVT = _PathCVT<_SourceChar<_Source> >;
+    bool __source_is_absolute = __is_separator(_Traits::__first_or_null(__src));
+    if (__source_is_absolute)
+      __pn_.clear();
+    else if (has_filename())
+      __pn_ += preferred_separator;
+    _CVT::__append_source(__pn_, __src);
+    return *this;
+  }
+
+  template <class _InputIt>
+  path& append(_InputIt __first, _InputIt __last) {
+    typedef typename iterator_traits<_InputIt>::value_type _ItVal;
+    static_assert(__can_convert_char<_ItVal>::value, "Must convertible");
+    using _CVT = _PathCVT<_ItVal>;
+    if (__first != __last && __is_separator(*__first))
+      __pn_.clear();
+    else if (has_filename())
+      __pn_ += preferred_separator;
+    _CVT::__append_range(__pn_, __first, __last);
+    return *this;
+  }
+#endif
+
+  // concatenation
+  _LIBCPP_INLINE_VISIBILITY
+  path& operator+=(const path& __x) {
+    __pn_ += __x.__pn_;
+    return *this;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  path& operator+=(const string_type& __x) {
+    __pn_ += __x;
+    return *this;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  path& operator+=(__string_view __x) {
+    __pn_ += __x;
+    return *this;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  path& operator+=(const value_type* __x) {
+    __pn_ += __x;
+    return *this;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  path& operator+=(value_type __x) {
+    __pn_ += __x;
+    return *this;
+  }
+
+  template <class _ECharT>
+  typename enable_if<__can_convert_char<_ECharT>::value, path&>::type
+  operator+=(_ECharT __x) {
+    _PathCVT<_ECharT>::__append_source(__pn_,
+                                       basic_string_view<_ECharT>(&__x, 1));
+    return *this;
+  }
+
+  template <class _Source>
+  _EnableIfPathable<_Source> operator+=(const _Source& __x) {
+    return this->concat(__x);
+  }
+
+  template <class _Source>
+  _EnableIfPathable<_Source> concat(const _Source& __x) {
+    _SourceCVT<_Source>::__append_source(__pn_, __x);
+    return *this;
+  }
+
+  template <class _InputIt>
+  path& concat(_InputIt __first, _InputIt __last) {
+    typedef typename iterator_traits<_InputIt>::value_type _ItVal;
+    _PathCVT<_ItVal>::__append_range(__pn_, __first, __last);
+    return *this;
+  }
+
+  // modifiers
+  _LIBCPP_INLINE_VISIBILITY
+  void clear() noexcept { __pn_.clear(); }
+
+  path& make_preferred() {
+#if defined(_LIBCPP_WIN32API)
+    _VSTD::replace(__pn_.begin(), __pn_.end(), L'/', L'\\');
+#endif
+    return *this;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  path& remove_filename() {
+    auto __fname = __filename();
+    if (!__fname.empty())
+      __pn_.erase(__fname.data() - __pn_.data());
+    return *this;
+  }
+
+  path& replace_filename(const path& __replacement) {
+    remove_filename();
+    return (*this /= __replacement);
+  }
+
+  path& replace_extension(const path& __replacement = path());
+
+  _LIBCPP_INLINE_VISIBILITY
+  void swap(path& __rhs) noexcept { __pn_.swap(__rhs.__pn_); }
+
+  // private helper to allow reserving memory in the path
+  _LIBCPP_INLINE_VISIBILITY
+  void __reserve(size_t __s) { __pn_.reserve(__s); }
+
+  // native format observers
+  _LIBCPP_INLINE_VISIBILITY
+  const string_type& native() const noexcept { return __pn_; }
+
+  _LIBCPP_INLINE_VISIBILITY
+  const value_type* c_str() const noexcept { return __pn_.c_str(); }
+
+  _LIBCPP_INLINE_VISIBILITY operator string_type() const { return __pn_; }
+
+#if defined(_LIBCPP_WIN32API)
+  _LIBCPP_INLINE_VISIBILITY _VSTD::wstring wstring() const { return __pn_; }
+
+  _VSTD::wstring generic_wstring() const {
+    _VSTD::wstring __s;
+    __s.resize(__pn_.size());
+    _VSTD::replace_copy(__pn_.begin(), __pn_.end(), __s.begin(), '\\', '/');
+    return __s;
+  }
+
+#if !defined(_LIBCPP_HAS_NO_LOCALIZATION)
+  template <class _ECharT, class _Traits = char_traits<_ECharT>,
+            class _Allocator = allocator<_ECharT> >
+  basic_string<_ECharT, _Traits, _Allocator>
+  string(const _Allocator& __a = _Allocator()) const {
+    using _Str = basic_string<_ECharT, _Traits, _Allocator>;
+    _Str __s(__a);
+    __s.reserve(__pn_.size());
+    _PathExport<_ECharT>::__append(__s, __pn_);
+    return __s;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY _VSTD::string string() const {
+    return string<char>();
+  }
+  _LIBCPP_INLINE_VISIBILITY __u8_string u8string() const {
+    using _CVT = __narrow_to_utf8<sizeof(wchar_t) * __CHAR_BIT__>;
+    __u8_string __s;
+    __s.reserve(__pn_.size());
+    _CVT()(back_inserter(__s), __pn_.data(), __pn_.data() + __pn_.size());
+    return __s;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY _VSTD::u16string u16string() const {
+    return string<char16_t>();
+  }
+  _LIBCPP_INLINE_VISIBILITY _VSTD::u32string u32string() const {
+    return string<char32_t>();
+  }
+
+  // generic format observers
+  template <class _ECharT, class _Traits = char_traits<_ECharT>,
+            class _Allocator = allocator<_ECharT> >
+  basic_string<_ECharT, _Traits, _Allocator>
+  generic_string(const _Allocator& __a = _Allocator()) const {
+    using _Str = basic_string<_ECharT, _Traits, _Allocator>;
+    _Str __s = string<_ECharT, _Traits, _Allocator>(__a);
+    // Note: This (and generic_u8string below) is slightly suboptimal as
+    // it iterates twice over the string; once to convert it to the right
+    // character type, and once to replace path delimiters.
+    _VSTD::replace(__s.begin(), __s.end(),
+                   static_cast<_ECharT>('\\'), static_cast<_ECharT>('/'));
+    return __s;
+  }
+
+  _VSTD::string generic_string() const { return generic_string<char>(); }
+  _VSTD::u16string generic_u16string() const { return generic_string<char16_t>(); }
+  _VSTD::u32string generic_u32string() const { return generic_string<char32_t>(); }
+  __u8_string generic_u8string() const {
+    __u8_string __s = u8string();
+    _VSTD::replace(__s.begin(), __s.end(), '\\', '/');
+    return __s;
+  }
+#endif /* !_LIBCPP_HAS_NO_LOCALIZATION */
+#else /* _LIBCPP_WIN32API */
+
+  _LIBCPP_INLINE_VISIBILITY _VSTD::string string() const { return __pn_; }
+#ifndef _LIBCPP_HAS_NO_CHAR8_T
+  _LIBCPP_INLINE_VISIBILITY _VSTD::u8string u8string() const { return _VSTD::u8string(__pn_.begin(), __pn_.end()); }
+#else
+  _LIBCPP_INLINE_VISIBILITY _VSTD::string u8string() const { return __pn_; }
+#endif
+
+#if !defined(_LIBCPP_HAS_NO_LOCALIZATION)
+  template <class _ECharT, class _Traits = char_traits<_ECharT>,
+            class _Allocator = allocator<_ECharT> >
+  basic_string<_ECharT, _Traits, _Allocator>
+  string(const _Allocator& __a = _Allocator()) const {
+    using _CVT = __widen_from_utf8<sizeof(_ECharT) * __CHAR_BIT__>;
+    using _Str = basic_string<_ECharT, _Traits, _Allocator>;
+    _Str __s(__a);
+    __s.reserve(__pn_.size());
+    _CVT()(back_inserter(__s), __pn_.data(), __pn_.data() + __pn_.size());
+    return __s;
+  }
+
+#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  _LIBCPP_INLINE_VISIBILITY _VSTD::wstring wstring() const {
+    return string<wchar_t>();
+  }
+#endif
+  _LIBCPP_INLINE_VISIBILITY _VSTD::u16string u16string() const {
+    return string<char16_t>();
+  }
+  _LIBCPP_INLINE_VISIBILITY _VSTD::u32string u32string() const {
+    return string<char32_t>();
+  }
+#endif /* !_LIBCPP_HAS_NO_LOCALIZATION */
+
+  // generic format observers
+  _VSTD::string generic_string() const { return __pn_; }
+#ifndef _LIBCPP_HAS_NO_CHAR8_T
+  _VSTD::u8string generic_u8string() const { return _VSTD::u8string(__pn_.begin(), __pn_.end()); }
+#else
+  _VSTD::string generic_u8string() const { return __pn_; }
+#endif
+
+#if !defined(_LIBCPP_HAS_NO_LOCALIZATION)
+  template <class _ECharT, class _Traits = char_traits<_ECharT>,
+            class _Allocator = allocator<_ECharT> >
+  basic_string<_ECharT, _Traits, _Allocator>
+  generic_string(const _Allocator& __a = _Allocator()) const {
+    return string<_ECharT, _Traits, _Allocator>(__a);
+  }
+
+#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  _VSTD::wstring generic_wstring() const { return string<wchar_t>(); }
+#endif
+  _VSTD::u16string generic_u16string() const { return string<char16_t>(); }
+  _VSTD::u32string generic_u32string() const { return string<char32_t>(); }
+#endif /* !_LIBCPP_HAS_NO_LOCALIZATION */
+#endif /* !_LIBCPP_WIN32API */
+
+private:
+  int __compare(__string_view) const;
+  __string_view __root_name() const;
+  __string_view __root_directory() const;
+  __string_view __root_path_raw() const;
+  __string_view __relative_path() const;
+  __string_view __parent_path() const;
+  __string_view __filename() const;
+  __string_view __stem() const;
+  __string_view __extension() const;
+
+public:
+  // compare
+  _LIBCPP_INLINE_VISIBILITY int compare(const path& __p) const noexcept {
+    return __compare(__p.__pn_);
+  }
+  _LIBCPP_INLINE_VISIBILITY int compare(const string_type& __s) const {
+    return __compare(__s);
+  }
+  _LIBCPP_INLINE_VISIBILITY int compare(__string_view __s) const {
+    return __compare(__s);
+  }
+  _LIBCPP_INLINE_VISIBILITY int compare(const value_type* __s) const {
+    return __compare(__s);
+  }
+
+  // decomposition
+  _LIBCPP_INLINE_VISIBILITY path root_name() const {
+    return string_type(__root_name());
+  }
+  _LIBCPP_INLINE_VISIBILITY path root_directory() const {
+    return string_type(__root_directory());
+  }
+  _LIBCPP_INLINE_VISIBILITY path root_path() const {
+#if defined(_LIBCPP_WIN32API)
+    return string_type(__root_path_raw());
+#else
+    return root_name().append(string_type(__root_directory()));
+#endif
+  }
+  _LIBCPP_INLINE_VISIBILITY path relative_path() const {
+    return string_type(__relative_path());
+  }
+  _LIBCPP_INLINE_VISIBILITY path parent_path() const {
+    return string_type(__parent_path());
+  }
+  _LIBCPP_INLINE_VISIBILITY path filename() const {
+    return string_type(__filename());
+  }
+  _LIBCPP_INLINE_VISIBILITY path stem() const { return string_type(__stem()); }
+  _LIBCPP_INLINE_VISIBILITY path extension() const {
+    return string_type(__extension());
+  }
+
+  // query
+  _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY bool
+  empty() const noexcept {
+    return __pn_.empty();
+  }
+
+  _LIBCPP_INLINE_VISIBILITY bool has_root_name() const {
+    return !__root_name().empty();
+  }
+  _LIBCPP_INLINE_VISIBILITY bool has_root_directory() const {
+    return !__root_directory().empty();
+  }
+  _LIBCPP_INLINE_VISIBILITY bool has_root_path() const {
+    return !__root_path_raw().empty();
+  }
+  _LIBCPP_INLINE_VISIBILITY bool has_relative_path() const {
+    return !__relative_path().empty();
+  }
+  _LIBCPP_INLINE_VISIBILITY bool has_parent_path() const {
+    return !__parent_path().empty();
+  }
+  _LIBCPP_INLINE_VISIBILITY bool has_filename() const {
+    return !__filename().empty();
+  }
+  _LIBCPP_INLINE_VISIBILITY bool has_stem() const { return !__stem().empty(); }
+  _LIBCPP_INLINE_VISIBILITY bool has_extension() const {
+    return !__extension().empty();
+  }
+
+  _LIBCPP_INLINE_VISIBILITY bool is_absolute() const {
+#if defined(_LIBCPP_WIN32API)
+    __string_view __root_name_str = __root_name();
+    __string_view __root_dir = __root_directory();
+    if (__root_name_str.size() == 2 && __root_name_str[1] == ':') {
+      // A drive letter with no root directory is relative, e.g. x:example.
+      return !__root_dir.empty();
+    }
+    // If no root name, it's relative, e.g. \example is relative to the current drive
+    if (__root_name_str.empty())
+      return false;
+    if (__root_name_str.size() < 3)
+      return false;
+    // A server root name, like \\server, is always absolute
+    if (__root_name_str[0] != '/' && __root_name_str[0] != '\\')
+      return false;
+    if (__root_name_str[1] != '/' && __root_name_str[1] != '\\')
+      return false;
+    // Seems to be a server root name
+    return true;
+#else
+    return has_root_directory();
+#endif
+  }
+  _LIBCPP_INLINE_VISIBILITY bool is_relative() const { return !is_absolute(); }
+
+  // relative paths
+  path lexically_normal() const;
+  path lexically_relative(const path& __base) const;
+
+  _LIBCPP_INLINE_VISIBILITY path lexically_proximate(const path& __base) const {
+    path __result = this->lexically_relative(__base);
+    if (__result.native().empty())
+      return *this;
+    return __result;
+  }
+
+  // iterators
+  class _LIBCPP_TYPE_VIS iterator;
+  typedef iterator const_iterator;
+
+  iterator begin() const;
+  iterator end() const;
+
+#if !defined(_LIBCPP_HAS_NO_LOCALIZATION)
+  template <class _CharT, class _Traits>
+  _LIBCPP_INLINE_VISIBILITY friend
+      typename enable_if<is_same<_CharT, value_type>::value &&
+                             is_same<_Traits, char_traits<value_type> >::value,
+                         basic_ostream<_CharT, _Traits>&>::type
+      operator<<(basic_ostream<_CharT, _Traits>& __os, const path& __p) {
+    __os << _VSTD::__quoted(__p.native());
+    return __os;
+  }
+
+  template <class _CharT, class _Traits>
+  _LIBCPP_INLINE_VISIBILITY friend
+      typename enable_if<!is_same<_CharT, value_type>::value ||
+                             !is_same<_Traits, char_traits<value_type> >::value,
+                         basic_ostream<_CharT, _Traits>&>::type
+      operator<<(basic_ostream<_CharT, _Traits>& __os, const path& __p) {
+    __os << _VSTD::__quoted(__p.string<_CharT, _Traits>());
+    return __os;
+  }
+
+  template <class _CharT, class _Traits>
+  _LIBCPP_INLINE_VISIBILITY friend basic_istream<_CharT, _Traits>&
+  operator>>(basic_istream<_CharT, _Traits>& __is, path& __p) {
+    basic_string<_CharT, _Traits> __tmp;
+    __is >> __quoted(__tmp);
+    __p = __tmp;
+    return __is;
+  }
+#endif // !_LIBCPP_HAS_NO_LOCALIZATION
+
   friend _LIBCPP_INLINE_VISIBILITY bool operator==(const path& __lhs, const path& __rhs) noexcept {
     return __lhs.compare(__rhs) == 0;
   }
@@ -1509,1518 +1509,1518 @@ public:
     __result /= __rhs;
     return __result;
   }
-private: 
-  inline _LIBCPP_INLINE_VISIBILITY path& 
-  __assign_view(__string_view const& __s) noexcept { 
-    __pn_ = string_type(__s); 
-    return *this; 
-  } 
-  string_type __pn_; 
-}; 
- 
-inline _LIBCPP_INLINE_VISIBILITY void swap(path& __lhs, path& __rhs) noexcept { 
-  __lhs.swap(__rhs); 
-} 
- 
-_LIBCPP_FUNC_VIS 
-size_t hash_value(const path& __p) noexcept; 
- 
-template <class _InputIt> 
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_DEPRECATED_WITH_CHAR8_T 
-    typename enable_if<__is_pathable<_InputIt>::value, path>::type 
-    u8path(_InputIt __f, _InputIt __l) { 
-  static_assert( 
-#ifndef _LIBCPP_HAS_NO_CHAR8_T 
-      is_same<typename __is_pathable<_InputIt>::__char_type, char8_t>::value || 
-#endif 
-      is_same<typename __is_pathable<_InputIt>::__char_type, char>::value, 
-      "u8path(Iter, Iter) requires Iter have a value_type of type 'char'" 
-      " or 'char8_t'"); 
-#if defined(_LIBCPP_WIN32API) 
-  string __tmp(__f, __l); 
-  using _CVT = __widen_from_utf8<sizeof(wchar_t) * __CHAR_BIT__>; 
-  _VSTD::wstring __w; 
-  __w.reserve(__tmp.size()); 
-  _CVT()(back_inserter(__w), __tmp.data(), __tmp.data() + __tmp.size()); 
-  return path(__w); 
-#else 
-  return path(__f, __l); 
-#endif /* !_LIBCPP_WIN32API */ 
-} 
- 
-#if defined(_LIBCPP_WIN32API) 
-template <class _InputIt> 
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_DEPRECATED_WITH_CHAR8_T 
-    typename enable_if<__is_pathable<_InputIt>::value, path>::type 
-    u8path(_InputIt __f, _NullSentinel) { 
-  static_assert( 
-#ifndef _LIBCPP_HAS_NO_CHAR8_T 
-      is_same<typename __is_pathable<_InputIt>::__char_type, char8_t>::value || 
-#endif 
-      is_same<typename __is_pathable<_InputIt>::__char_type, char>::value, 
-      "u8path(Iter, Iter) requires Iter have a value_type of type 'char'" 
-      " or 'char8_t'"); 
-  string __tmp; 
-  const char __sentinel = char{}; 
-  for (; *__f != __sentinel; ++__f) 
-    __tmp.push_back(*__f); 
-  using _CVT = __widen_from_utf8<sizeof(wchar_t) * __CHAR_BIT__>; 
-  _VSTD::wstring __w; 
-  __w.reserve(__tmp.size()); 
-  _CVT()(back_inserter(__w), __tmp.data(), __tmp.data() + __tmp.size()); 
-  return path(__w); 
-} 
-#endif /* _LIBCPP_WIN32API */ 
- 
-template <class _Source> 
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_DEPRECATED_WITH_CHAR8_T 
-    typename enable_if<__is_pathable<_Source>::value, path>::type 
-    u8path(const _Source& __s) { 
-  static_assert( 
-#ifndef _LIBCPP_HAS_NO_CHAR8_T 
-      is_same<typename __is_pathable<_Source>::__char_type, char8_t>::value || 
-#endif 
-      is_same<typename __is_pathable<_Source>::__char_type, char>::value, 
-      "u8path(Source const&) requires Source have a character type of type " 
-      "'char' or 'char8_t'"); 
-#if defined(_LIBCPP_WIN32API) 
-  using _Traits = __is_pathable<_Source>; 
-  return u8path(_VSTD::__unwrap_iter(_Traits::__range_begin(__s)), _VSTD::__unwrap_iter(_Traits::__range_end(__s))); 
-#else 
-  return path(__s); 
-#endif 
-} 
- 
-class _LIBCPP_TYPE_VIS path::iterator { 
-public: 
-  enum _ParserState : unsigned char { 
-    _Singular, 
-    _BeforeBegin, 
-    _InRootName, 
-    _InRootDir, 
-    _InFilenames, 
-    _InTrailingSep, 
-    _AtEnd 
-  }; 
- 
-public: 
-  typedef bidirectional_iterator_tag iterator_category; 
- 
-  typedef path value_type; 
-  typedef ptrdiff_t difference_type; 
-  typedef const path* pointer; 
-  typedef const path& reference; 
- 
-  typedef void 
-      __stashing_iterator_tag; // See reverse_iterator and __is_stashing_iterator 
- 
-public: 
-  _LIBCPP_INLINE_VISIBILITY 
-  iterator() 
-      : __stashed_elem_(), __path_ptr_(nullptr), __entry_(), 
-        __state_(_Singular) {} 
- 
-  iterator(const iterator&) = default; 
-  ~iterator() = default; 
- 
-  iterator& operator=(const iterator&) = default; 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  reference operator*() const { return __stashed_elem_; } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  pointer operator->() const { return &__stashed_elem_; } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  iterator& operator++() { 
-    _LIBCPP_ASSERT(__state_ != _Singular, 
-                   "attempting to increment a singular iterator"); 
-    _LIBCPP_ASSERT(__state_ != _AtEnd, 
-                   "attempting to increment the end iterator"); 
-    return __increment(); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  iterator operator++(int) { 
-    iterator __it(*this); 
-    this->operator++(); 
-    return __it; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  iterator& operator--() { 
-    _LIBCPP_ASSERT(__state_ != _Singular, 
-                   "attempting to decrement a singular iterator"); 
-    _LIBCPP_ASSERT(__entry_.data() != __path_ptr_->native().data(), 
-                   "attempting to decrement the begin iterator"); 
-    return __decrement(); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  iterator operator--(int) { 
-    iterator __it(*this); 
-    this->operator--(); 
-    return __it; 
-  } 
- 
-private: 
-  friend class path; 
- 
-  inline _LIBCPP_INLINE_VISIBILITY friend bool operator==(const iterator&, 
-                                                          const iterator&); 
- 
-  iterator& __increment(); 
-  iterator& __decrement(); 
- 
-  path __stashed_elem_; 
-  const path* __path_ptr_; 
-  path::__string_view __entry_; 
-  _ParserState __state_; 
-}; 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool operator==(const path::iterator& __lhs, 
-                                                 const path::iterator& __rhs) { 
-  return __lhs.__path_ptr_ == __rhs.__path_ptr_ && 
-         __lhs.__entry_.data() == __rhs.__entry_.data(); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool operator!=(const path::iterator& __lhs, 
-                                                 const path::iterator& __rhs) { 
-  return !(__lhs == __rhs); 
-} 
- 
-// TODO(ldionne): We need to pop the pragma and push it again after 
-//                filesystem_error to work around PR41078. 
-_LIBCPP_AVAILABILITY_FILESYSTEM_POP 
- 
-class _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_EXCEPTION_ABI filesystem_error : public system_error { 
-public: 
-  _LIBCPP_INLINE_VISIBILITY 
-  filesystem_error(const string& __what, error_code __ec) 
-      : system_error(__ec, __what), 
-        __storage_(make_shared<_Storage>(path(), path())) { 
-    __create_what(0); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  filesystem_error(const string& __what, const path& __p1, error_code __ec) 
-      : system_error(__ec, __what), 
-        __storage_(make_shared<_Storage>(__p1, path())) { 
-    __create_what(1); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  filesystem_error(const string& __what, const path& __p1, const path& __p2, 
-                   error_code __ec) 
-      : system_error(__ec, __what), 
-        __storage_(make_shared<_Storage>(__p1, __p2)) { 
-    __create_what(2); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  const path& path1() const noexcept { return __storage_->__p1_; } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  const path& path2() const noexcept { return __storage_->__p2_; } 
- 
-  filesystem_error(const filesystem_error&) = default; 
-  ~filesystem_error() override; // key function 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  const char* what() const noexcept override { 
-    return __storage_->__what_.c_str(); 
-  } 
- 
-  void __create_what(int __num_paths); 
- 
-private: 
-  struct _LIBCPP_HIDDEN _Storage { 
-    _LIBCPP_INLINE_VISIBILITY 
-    _Storage(const path& __p1, const path& __p2) : __p1_(__p1), __p2_(__p2) {} 
- 
-    path __p1_; 
-    path __p2_; 
-    string __what_; 
-  }; 
-  shared_ptr<_Storage> __storage_; 
-}; 
- 
-_LIBCPP_AVAILABILITY_FILESYSTEM_PUSH 
- 
-template <class... _Args> 
-_LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY 
-#ifndef _LIBCPP_NO_EXCEPTIONS 
-void __throw_filesystem_error(_Args&&... __args) { 
-  throw filesystem_error(_VSTD::forward<_Args>(__args)...); 
-} 
-#else 
-void __throw_filesystem_error(_Args&&...) { 
-  _VSTD::abort(); 
-} 
-#endif 
- 
-// operational functions 
- 
-_LIBCPP_FUNC_VIS 
-path __absolute(const path&, error_code* __ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-path __canonical(const path&, error_code* __ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-void __copy(const path& __from, const path& __to, copy_options __opt, 
-            error_code* __ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-bool __copy_file(const path& __from, const path& __to, copy_options __opt, 
-                 error_code* __ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-void __copy_symlink(const path& __existing_symlink, const path& __new_symlink, 
-                    error_code* __ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-bool __create_directories(const path& p, error_code* ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-bool __create_directory(const path& p, error_code* ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-bool __create_directory(const path& p, const path& attributes, 
-                        error_code* ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-void __create_directory_symlink(const path& __to, const path& __new_symlink, 
-                                error_code* __ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-void __create_hard_link(const path& __to, const path& __new_hard_link, 
-                        error_code* __ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-void __create_symlink(const path& __to, const path& __new_symlink, 
-                      error_code* __ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-path __current_path(error_code* __ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-void __current_path(const path&, error_code* __ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-bool __equivalent(const path&, const path&, error_code* __ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-uintmax_t __file_size(const path&, error_code* __ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-uintmax_t __hard_link_count(const path&, error_code* __ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-bool __fs_is_empty(const path& p, error_code* ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-file_time_type __last_write_time(const path& p, error_code* ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-void __last_write_time(const path& p, file_time_type new_time, 
-                       error_code* ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-void __permissions(const path&, perms, perm_options, error_code* = nullptr); 
-_LIBCPP_FUNC_VIS 
-path __read_symlink(const path& p, error_code* ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-bool __remove(const path& p, error_code* ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-uintmax_t __remove_all(const path& p, error_code* ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-void __rename(const path& from, const path& to, error_code* ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-void __resize_file(const path& p, uintmax_t size, error_code* ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-space_info __space(const path&, error_code* __ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-file_status __status(const path&, error_code* __ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-file_status __symlink_status(const path&, error_code* __ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-path __system_complete(const path&, error_code* __ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-path __temp_directory_path(error_code* __ec = nullptr); 
-_LIBCPP_FUNC_VIS 
-path __weakly_canonical(path const& __p, error_code* __ec = nullptr); 
- 
-inline _LIBCPP_INLINE_VISIBILITY path current_path() { 
-  return __current_path(); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY path current_path(error_code& __ec) { 
-  return __current_path(&__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void current_path(const path& __p) { 
-  __current_path(__p); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void current_path(const path& __p, 
-                                                   error_code& __ec) noexcept { 
-  __current_path(__p, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY path absolute(const path& __p) { 
-  return __absolute(__p); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY path absolute(const path& __p, 
-                                               error_code& __ec) { 
-  return __absolute(__p, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY path canonical(const path& __p) { 
-  return __canonical(__p); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY path canonical(const path& __p, 
-                                                error_code& __ec) { 
-  return __canonical(__p, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void copy(const path& __from, 
-                                           const path& __to) { 
-  __copy(__from, __to, copy_options::none); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void copy(const path& __from, const path& __to, 
-                                           error_code& __ec) { 
-  __copy(__from, __to, copy_options::none, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void copy(const path& __from, const path& __to, 
-                                           copy_options __opt) { 
-  __copy(__from, __to, __opt); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void copy(const path& __from, const path& __to, 
-                                           copy_options __opt, 
-                                           error_code& __ec) { 
-  __copy(__from, __to, __opt, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool copy_file(const path& __from, 
-                                                const path& __to) { 
-  return __copy_file(__from, __to, copy_options::none); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool 
-copy_file(const path& __from, const path& __to, error_code& __ec) { 
-  return __copy_file(__from, __to, copy_options::none, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool 
-copy_file(const path& __from, const path& __to, copy_options __opt) { 
-  return __copy_file(__from, __to, __opt); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool copy_file(const path& __from, 
-                                                const path& __to, 
-                                                copy_options __opt, 
-                                                error_code& __ec) { 
-  return __copy_file(__from, __to, __opt, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void copy_symlink(const path& __existing, 
-                                                   const path& __new) { 
-  __copy_symlink(__existing, __new); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void 
-copy_symlink(const path& __ext, const path& __new, error_code& __ec) noexcept { 
-  __copy_symlink(__ext, __new, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool create_directories(const path& __p) { 
-  return __create_directories(__p); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool create_directories(const path& __p, 
-                                                         error_code& __ec) { 
-  return __create_directories(__p, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool create_directory(const path& __p) { 
-  return __create_directory(__p); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool 
-create_directory(const path& __p, error_code& __ec) noexcept { 
-  return __create_directory(__p, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool create_directory(const path& __p, 
-                                                       const path& __attrs) { 
-  return __create_directory(__p, __attrs); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool 
-create_directory(const path& __p, const path& __attrs, 
-                 error_code& __ec) noexcept { 
-  return __create_directory(__p, __attrs, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void 
-create_directory_symlink(const path& __to, const path& __new) { 
-  __create_directory_symlink(__to, __new); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void 
-create_directory_symlink(const path& __to, const path& __new, 
-                         error_code& __ec) noexcept { 
-  __create_directory_symlink(__to, __new, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void create_hard_link(const path& __to, 
-                                                       const path& __new) { 
-  __create_hard_link(__to, __new); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void 
-create_hard_link(const path& __to, const path& __new, 
-                 error_code& __ec) noexcept { 
-  __create_hard_link(__to, __new, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void create_symlink(const path& __to, 
-                                                     const path& __new) { 
-  __create_symlink(__to, __new); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void 
-create_symlink(const path& __to, const path& __new, error_code& __ec) noexcept { 
-  return __create_symlink(__to, __new, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool status_known(file_status __s) noexcept { 
-  return __s.type() != file_type::none; 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool exists(file_status __s) noexcept { 
-  return status_known(__s) && __s.type() != file_type::not_found; 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool exists(const path& __p) { 
-  return exists(__status(__p)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool exists(const path& __p, 
-                                             error_code& __ec) noexcept { 
-  auto __s = __status(__p, &__ec); 
-  if (status_known(__s)) 
-    __ec.clear(); 
-  return exists(__s); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool equivalent(const path& __p1, 
-                                                 const path& __p2) { 
-  return __equivalent(__p1, __p2); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool 
-equivalent(const path& __p1, const path& __p2, error_code& __ec) noexcept { 
-  return __equivalent(__p1, __p2, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY uintmax_t file_size(const path& __p) { 
-  return __file_size(__p); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY uintmax_t 
-file_size(const path& __p, error_code& __ec) noexcept { 
-  return __file_size(__p, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY uintmax_t hard_link_count(const path& __p) { 
-  return __hard_link_count(__p); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY uintmax_t 
-hard_link_count(const path& __p, error_code& __ec) noexcept { 
-  return __hard_link_count(__p, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_block_file(file_status __s) noexcept { 
-  return __s.type() == file_type::block; 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_block_file(const path& __p) { 
-  return is_block_file(__status(__p)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_block_file(const path& __p, 
-                                                    error_code& __ec) noexcept { 
-  return is_block_file(__status(__p, &__ec)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool 
-is_character_file(file_status __s) noexcept { 
-  return __s.type() == file_type::character; 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_character_file(const path& __p) { 
-  return is_character_file(__status(__p)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool 
-is_character_file(const path& __p, error_code& __ec) noexcept { 
-  return is_character_file(__status(__p, &__ec)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_directory(file_status __s) noexcept { 
-  return __s.type() == file_type::directory; 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_directory(const path& __p) { 
-  return is_directory(__status(__p)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_directory(const path& __p, 
-                                                   error_code& __ec) noexcept { 
-  return is_directory(__status(__p, &__ec)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_empty(const path& __p) { 
-  return __fs_is_empty(__p); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_empty(const path& __p, 
-                                               error_code& __ec) { 
-  return __fs_is_empty(__p, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_fifo(file_status __s) noexcept { 
-  return __s.type() == file_type::fifo; 
-} 
-inline _LIBCPP_INLINE_VISIBILITY bool is_fifo(const path& __p) { 
-  return is_fifo(__status(__p)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_fifo(const path& __p, 
-                                              error_code& __ec) noexcept { 
-  return is_fifo(__status(__p, &__ec)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool 
-is_regular_file(file_status __s) noexcept { 
-  return __s.type() == file_type::regular; 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_regular_file(const path& __p) { 
-  return is_regular_file(__status(__p)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool 
-is_regular_file(const path& __p, error_code& __ec) noexcept { 
-  return is_regular_file(__status(__p, &__ec)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_socket(file_status __s) noexcept { 
-  return __s.type() == file_type::socket; 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_socket(const path& __p) { 
-  return is_socket(__status(__p)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_socket(const path& __p, 
-                                                error_code& __ec) noexcept { 
-  return is_socket(__status(__p, &__ec)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_symlink(file_status __s) noexcept { 
-  return __s.type() == file_type::symlink; 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_symlink(const path& __p) { 
-  return is_symlink(__symlink_status(__p)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_symlink(const path& __p, 
-                                                 error_code& __ec) noexcept { 
-  return is_symlink(__symlink_status(__p, &__ec)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_other(file_status __s) noexcept { 
-  return exists(__s) && !is_regular_file(__s) && !is_directory(__s) && 
-         !is_symlink(__s); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_other(const path& __p) { 
-  return is_other(__status(__p)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool is_other(const path& __p, 
-                                               error_code& __ec) noexcept { 
-  return is_other(__status(__p, &__ec)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY file_time_type 
-last_write_time(const path& __p) { 
-  return __last_write_time(__p); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY file_time_type 
-last_write_time(const path& __p, error_code& __ec) noexcept { 
-  return __last_write_time(__p, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void last_write_time(const path& __p, 
-                                                      file_time_type __t) { 
-  __last_write_time(__p, __t); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void 
-last_write_time(const path& __p, file_time_type __t, 
-                error_code& __ec) noexcept { 
-  __last_write_time(__p, __t, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void 
-permissions(const path& __p, perms __prms, 
-            perm_options __opts = perm_options::replace) { 
-  __permissions(__p, __prms, __opts); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void permissions(const path& __p, perms __prms, 
-                                                  error_code& __ec) noexcept { 
-  __permissions(__p, __prms, perm_options::replace, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void permissions(const path& __p, perms __prms, 
-                                                  perm_options __opts, 
-                                                  error_code& __ec) { 
-  __permissions(__p, __prms, __opts, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY path proximate(const path& __p, 
-                                                const path& __base, 
-                                                error_code& __ec) { 
-  path __tmp = __weakly_canonical(__p, &__ec); 
-  if (__ec) 
-    return {}; 
-  path __tmp_base = __weakly_canonical(__base, &__ec); 
-  if (__ec) 
-    return {}; 
-  return __tmp.lexically_proximate(__tmp_base); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY path proximate(const path& __p, 
-                                                error_code& __ec) { 
-  return proximate(__p, current_path(), __ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY path 
-proximate(const path& __p, const path& __base = current_path()) { 
-  return __weakly_canonical(__p).lexically_proximate( 
-      __weakly_canonical(__base)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY path read_symlink(const path& __p) { 
-  return __read_symlink(__p); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY path read_symlink(const path& __p, 
-                                                   error_code& __ec) { 
-  return __read_symlink(__p, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY path relative(const path& __p, 
-                                               const path& __base, 
-                                               error_code& __ec) { 
-  path __tmp = __weakly_canonical(__p, &__ec); 
-  if (__ec) 
-    return path(); 
-  path __tmpbase = __weakly_canonical(__base, &__ec); 
-  if (__ec) 
-    return path(); 
-  return __tmp.lexically_relative(__tmpbase); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY path relative(const path& __p, 
-                                               error_code& __ec) { 
-  return relative(__p, current_path(), __ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY path 
-relative(const path& __p, const path& __base = current_path()) { 
-  return __weakly_canonical(__p).lexically_relative(__weakly_canonical(__base)); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool remove(const path& __p) { 
-  return __remove(__p); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool remove(const path& __p, 
-                                             error_code& __ec) noexcept { 
-  return __remove(__p, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY uintmax_t remove_all(const path& __p) { 
-  return __remove_all(__p); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY uintmax_t remove_all(const path& __p, 
-                                                      error_code& __ec) { 
-  return __remove_all(__p, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void rename(const path& __from, 
-                                             const path& __to) { 
-  return __rename(__from, __to); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void 
-rename(const path& __from, const path& __to, error_code& __ec) noexcept { 
-  return __rename(__from, __to, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void resize_file(const path& __p, 
-                                                  uintmax_t __ns) { 
-  return __resize_file(__p, __ns); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY void 
-resize_file(const path& __p, uintmax_t __ns, error_code& __ec) noexcept { 
-  return __resize_file(__p, __ns, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY space_info space(const path& __p) { 
-  return __space(__p); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY space_info space(const path& __p, 
-                                                  error_code& __ec) noexcept { 
-  return __space(__p, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY file_status status(const path& __p) { 
-  return __status(__p); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY file_status status(const path& __p, 
-                                                    error_code& __ec) noexcept { 
-  return __status(__p, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY file_status symlink_status(const path& __p) { 
-  return __symlink_status(__p); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY file_status 
-symlink_status(const path& __p, error_code& __ec) noexcept { 
-  return __symlink_status(__p, &__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY path temp_directory_path() { 
-  return __temp_directory_path(); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY path temp_directory_path(error_code& __ec) { 
-  return __temp_directory_path(&__ec); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY path weakly_canonical(path const& __p) { 
-  return __weakly_canonical(__p); 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY path weakly_canonical(path const& __p, 
-                                                       error_code& __ec) { 
-  return __weakly_canonical(__p, &__ec); 
-} 
- 
-class directory_iterator; 
-class recursive_directory_iterator; 
-class _LIBCPP_HIDDEN __dir_stream; 
- 
-class directory_entry { 
-  typedef _VSTD_FS::path _Path; 
- 
-public: 
-  // constructors and destructors 
-  directory_entry() noexcept = default; 
-  directory_entry(directory_entry const&) = default; 
-  directory_entry(directory_entry&&) noexcept = default; 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  explicit directory_entry(_Path const& __p) : __p_(__p) { 
-    error_code __ec; 
-    __refresh(&__ec); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  directory_entry(_Path const& __p, error_code& __ec) : __p_(__p) { 
-    __refresh(&__ec); 
-  } 
- 
-  ~directory_entry() {} 
- 
-  directory_entry& operator=(directory_entry const&) = default; 
-  directory_entry& operator=(directory_entry&&) noexcept = default; 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  void assign(_Path const& __p) { 
-    __p_ = __p; 
-    error_code __ec; 
-    __refresh(&__ec); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  void assign(_Path const& __p, error_code& __ec) { 
-    __p_ = __p; 
-    __refresh(&__ec); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  void replace_filename(_Path const& __p) { 
-    __p_.replace_filename(__p); 
-    error_code __ec; 
-    __refresh(&__ec); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  void replace_filename(_Path const& __p, error_code& __ec) { 
-    __p_ = __p_.parent_path() / __p; 
-    __refresh(&__ec); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  void refresh() { __refresh(); } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  void refresh(error_code& __ec) noexcept { __refresh(&__ec); } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  _Path const& path() const noexcept { return __p_; } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  operator const _Path&() const noexcept { return __p_; } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool exists() const { return _VSTD_FS::exists(file_status{__get_ft()}); } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool exists(error_code& __ec) const noexcept { 
-    return _VSTD_FS::exists(file_status{__get_ft(&__ec)}); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool is_block_file() const { return __get_ft() == file_type::block; } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool is_block_file(error_code& __ec) const noexcept { 
-    return __get_ft(&__ec) == file_type::block; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool is_character_file() const { return __get_ft() == file_type::character; } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool is_character_file(error_code& __ec) const noexcept { 
-    return __get_ft(&__ec) == file_type::character; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool is_directory() const { return __get_ft() == file_type::directory; } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool is_directory(error_code& __ec) const noexcept { 
-    return __get_ft(&__ec) == file_type::directory; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool is_fifo() const { return __get_ft() == file_type::fifo; } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool is_fifo(error_code& __ec) const noexcept { 
-    return __get_ft(&__ec) == file_type::fifo; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool is_other() const { return _VSTD_FS::is_other(file_status{__get_ft()}); } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool is_other(error_code& __ec) const noexcept { 
-    return _VSTD_FS::is_other(file_status{__get_ft(&__ec)}); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool is_regular_file() const { return __get_ft() == file_type::regular; } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool is_regular_file(error_code& __ec) const noexcept { 
-    return __get_ft(&__ec) == file_type::regular; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool is_socket() const { return __get_ft() == file_type::socket; } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool is_socket(error_code& __ec) const noexcept { 
-    return __get_ft(&__ec) == file_type::socket; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool is_symlink() const { return __get_sym_ft() == file_type::symlink; } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool is_symlink(error_code& __ec) const noexcept { 
-    return __get_sym_ft(&__ec) == file_type::symlink; 
-  } 
-  _LIBCPP_INLINE_VISIBILITY 
-  uintmax_t file_size() const { return __get_size(); } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  uintmax_t file_size(error_code& __ec) const noexcept { 
-    return __get_size(&__ec); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  uintmax_t hard_link_count() const { return __get_nlink(); } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  uintmax_t hard_link_count(error_code& __ec) const noexcept { 
-    return __get_nlink(&__ec); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  file_time_type last_write_time() const { return __get_write_time(); } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  file_time_type last_write_time(error_code& __ec) const noexcept { 
-    return __get_write_time(&__ec); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  file_status status() const { return __get_status(); } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  file_status status(error_code& __ec) const noexcept { 
-    return __get_status(&__ec); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  file_status symlink_status() const { return __get_symlink_status(); } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  file_status symlink_status(error_code& __ec) const noexcept { 
-    return __get_symlink_status(&__ec); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool operator<(directory_entry const& __rhs) const noexcept { 
-    return __p_ < __rhs.__p_; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool operator==(directory_entry const& __rhs) const noexcept { 
-    return __p_ == __rhs.__p_; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool operator!=(directory_entry const& __rhs) const noexcept { 
-    return __p_ != __rhs.__p_; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool operator<=(directory_entry const& __rhs) const noexcept { 
-    return __p_ <= __rhs.__p_; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool operator>(directory_entry const& __rhs) const noexcept { 
-    return __p_ > __rhs.__p_; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool operator>=(directory_entry const& __rhs) const noexcept { 
-    return __p_ >= __rhs.__p_; 
-  } 
- 
-private: 
-  friend class directory_iterator; 
-  friend class recursive_directory_iterator; 
-  friend class __dir_stream; 
- 
-  enum _CacheType : unsigned char { 
-    _Empty, 
-    _IterSymlink, 
-    _IterNonSymlink, 
-    _RefreshSymlink, 
-    _RefreshSymlinkUnresolved, 
-    _RefreshNonSymlink 
-  }; 
- 
-  struct __cached_data { 
-    uintmax_t __size_; 
-    uintmax_t __nlink_; 
-    file_time_type __write_time_; 
-    perms __sym_perms_; 
-    perms __non_sym_perms_; 
-    file_type __type_; 
-    _CacheType __cache_type_; 
- 
-    _LIBCPP_INLINE_VISIBILITY 
-    __cached_data() noexcept { __reset(); } 
- 
-    _LIBCPP_INLINE_VISIBILITY 
-    void __reset() { 
-      __cache_type_ = _Empty; 
-      __type_ = file_type::none; 
-      __sym_perms_ = __non_sym_perms_ = perms::unknown; 
-      __size_ = __nlink_ = uintmax_t(-1); 
-      __write_time_ = file_time_type::min(); 
-    } 
-  }; 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  static __cached_data __create_iter_result(file_type __ft) { 
-    __cached_data __data; 
-    __data.__type_ = __ft; 
-    __data.__cache_type_ = [&]() { 
-      switch (__ft) { 
-      case file_type::none: 
-        return _Empty; 
-      case file_type::symlink: 
-        return _IterSymlink; 
-      default: 
-        return _IterNonSymlink; 
-      } 
-    }(); 
-    return __data; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  void __assign_iter_entry(_Path&& __p, __cached_data __dt) { 
-    __p_ = _VSTD::move(__p); 
-    __data_ = __dt; 
-  } 
- 
-  _LIBCPP_FUNC_VIS 
-  error_code __do_refresh() noexcept; 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  static bool __is_dne_error(error_code const& __ec) { 
-    if (!__ec) 
-      return true; 
-    switch (static_cast<errc>(__ec.value())) { 
-    case errc::no_such_file_or_directory: 
-    case errc::not_a_directory: 
-      return true; 
-    default: 
-      return false; 
-    } 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  void __handle_error(const char* __msg, error_code* __dest_ec, 
-                      error_code const& __ec, bool __allow_dne = false) const { 
-    if (__dest_ec) { 
-      *__dest_ec = __ec; 
-      return; 
-    } 
-    if (__ec && (!__allow_dne || !__is_dne_error(__ec))) 
-      __throw_filesystem_error(__msg, __p_, __ec); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  void __refresh(error_code* __ec = nullptr) { 
-    __handle_error("in directory_entry::refresh", __ec, __do_refresh(), 
-                   /*allow_dne*/ true); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  file_type __get_sym_ft(error_code* __ec = nullptr) const { 
-    switch (__data_.__cache_type_) { 
-    case _Empty: 
-      return __symlink_status(__p_, __ec).type(); 
-    case _IterSymlink: 
-    case _RefreshSymlink: 
-    case _RefreshSymlinkUnresolved: 
-      if (__ec) 
-        __ec->clear(); 
-      return file_type::symlink; 
-    case _IterNonSymlink: 
-    case _RefreshNonSymlink: 
-      file_status __st(__data_.__type_); 
-      if (__ec && !_VSTD_FS::exists(__st)) 
-        *__ec = make_error_code(errc::no_such_file_or_directory); 
-      else if (__ec) 
-        __ec->clear(); 
-      return __data_.__type_; 
-    } 
-    _LIBCPP_UNREACHABLE(); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  file_type __get_ft(error_code* __ec = nullptr) const { 
-    switch (__data_.__cache_type_) { 
-    case _Empty: 
-    case _IterSymlink: 
-    case _RefreshSymlinkUnresolved: 
-      return __status(__p_, __ec).type(); 
-    case _IterNonSymlink: 
-    case _RefreshNonSymlink: 
-    case _RefreshSymlink: { 
-      file_status __st(__data_.__type_); 
-      if (__ec && !_VSTD_FS::exists(__st)) 
-        *__ec = make_error_code(errc::no_such_file_or_directory); 
-      else if (__ec) 
-        __ec->clear(); 
-      return __data_.__type_; 
-    } 
-    } 
-    _LIBCPP_UNREACHABLE(); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  file_status __get_status(error_code* __ec = nullptr) const { 
-    switch (__data_.__cache_type_) { 
-    case _Empty: 
-    case _IterNonSymlink: 
-    case _IterSymlink: 
-    case _RefreshSymlinkUnresolved: 
-      return __status(__p_, __ec); 
-    case _RefreshNonSymlink: 
-    case _RefreshSymlink: 
-      return file_status(__get_ft(__ec), __data_.__non_sym_perms_); 
-    } 
-    _LIBCPP_UNREACHABLE(); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  file_status __get_symlink_status(error_code* __ec = nullptr) const { 
-    switch (__data_.__cache_type_) { 
-    case _Empty: 
-    case _IterNonSymlink: 
-    case _IterSymlink: 
-      return __symlink_status(__p_, __ec); 
-    case _RefreshNonSymlink: 
-      return file_status(__get_sym_ft(__ec), __data_.__non_sym_perms_); 
-    case _RefreshSymlink: 
-    case _RefreshSymlinkUnresolved: 
-      return file_status(__get_sym_ft(__ec), __data_.__sym_perms_); 
-    } 
-    _LIBCPP_UNREACHABLE(); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  uintmax_t __get_size(error_code* __ec = nullptr) const { 
-    switch (__data_.__cache_type_) { 
-    case _Empty: 
-    case _IterNonSymlink: 
-    case _IterSymlink: 
-    case _RefreshSymlinkUnresolved: 
-      return _VSTD_FS::__file_size(__p_, __ec); 
-    case _RefreshSymlink: 
-    case _RefreshNonSymlink: { 
-      error_code __m_ec; 
-      file_status __st(__get_ft(&__m_ec)); 
-      __handle_error("in directory_entry::file_size", __ec, __m_ec); 
-      if (_VSTD_FS::exists(__st) && !_VSTD_FS::is_regular_file(__st)) { 
-        errc __err_kind = _VSTD_FS::is_directory(__st) ? errc::is_a_directory 
-                                                       : errc::not_supported; 
-        __handle_error("in directory_entry::file_size", __ec, 
-                       make_error_code(__err_kind)); 
-      } 
-      return __data_.__size_; 
-    } 
-    } 
-    _LIBCPP_UNREACHABLE(); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  uintmax_t __get_nlink(error_code* __ec = nullptr) const { 
-    switch (__data_.__cache_type_) { 
-    case _Empty: 
-    case _IterNonSymlink: 
-    case _IterSymlink: 
-    case _RefreshSymlinkUnresolved: 
-      return _VSTD_FS::__hard_link_count(__p_, __ec); 
-    case _RefreshSymlink: 
-    case _RefreshNonSymlink: { 
-      error_code __m_ec; 
-      (void)__get_ft(&__m_ec); 
-      __handle_error("in directory_entry::hard_link_count", __ec, __m_ec); 
-      return __data_.__nlink_; 
-    } 
-    } 
-    _LIBCPP_UNREACHABLE(); 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  file_time_type __get_write_time(error_code* __ec = nullptr) const { 
-    switch (__data_.__cache_type_) { 
-    case _Empty: 
-    case _IterNonSymlink: 
-    case _IterSymlink: 
-    case _RefreshSymlinkUnresolved: 
-      return _VSTD_FS::__last_write_time(__p_, __ec); 
-    case _RefreshSymlink: 
-    case _RefreshNonSymlink: { 
-      error_code __m_ec; 
-      file_status __st(__get_ft(&__m_ec)); 
-      __handle_error("in directory_entry::last_write_time", __ec, __m_ec); 
-      if (_VSTD_FS::exists(__st) && 
-          __data_.__write_time_ == file_time_type::min()) 
-        __handle_error("in directory_entry::last_write_time", __ec, 
-                       make_error_code(errc::value_too_large)); 
-      return __data_.__write_time_; 
-    } 
-    } 
-    _LIBCPP_UNREACHABLE(); 
-  } 
- 
-private: 
-  _Path __p_; 
-  __cached_data __data_; 
-}; 
- 
-class __dir_element_proxy { 
-public: 
-  inline _LIBCPP_INLINE_VISIBILITY directory_entry operator*() { 
-    return _VSTD::move(__elem_); 
-  } 
- 
-private: 
-  friend class directory_iterator; 
-  friend class recursive_directory_iterator; 
-  explicit __dir_element_proxy(directory_entry const& __e) : __elem_(__e) {} 
-  __dir_element_proxy(__dir_element_proxy&& __o) 
-      : __elem_(_VSTD::move(__o.__elem_)) {} 
-  directory_entry __elem_; 
-}; 
- 
-class directory_iterator { 
-public: 
-  typedef directory_entry value_type; 
-  typedef ptrdiff_t difference_type; 
-  typedef value_type const* pointer; 
-  typedef value_type const& reference; 
-  typedef input_iterator_tag iterator_category; 
- 
-public: 
-  //ctor & dtor 
-  directory_iterator() noexcept {} 
- 
-  explicit directory_iterator(const path& __p) 
-      : directory_iterator(__p, nullptr) {} 
- 
-  directory_iterator(const path& __p, directory_options __opts) 
-      : directory_iterator(__p, nullptr, __opts) {} 
- 
-  directory_iterator(const path& __p, error_code& __ec) 
-      : directory_iterator(__p, &__ec) {} 
- 
-  directory_iterator(const path& __p, directory_options __opts, 
-                     error_code& __ec) 
-      : directory_iterator(__p, &__ec, __opts) {} 
- 
-  directory_iterator(const directory_iterator&) = default; 
-  directory_iterator(directory_iterator&&) = default; 
-  directory_iterator& operator=(const directory_iterator&) = default; 
- 
-  directory_iterator& operator=(directory_iterator&& __o) noexcept { 
-    // non-default implementation provided to support self-move assign. 
-    if (this != &__o) { 
-      __imp_ = _VSTD::move(__o.__imp_); 
-    } 
-    return *this; 
-  } 
- 
-  ~directory_iterator() = default; 
- 
-  const directory_entry& operator*() const { 
-    _LIBCPP_ASSERT(__imp_, "The end iterator cannot be dereferenced"); 
-    return __dereference(); 
-  } 
- 
-  const directory_entry* operator->() const { return &**this; } 
- 
-  directory_iterator& operator++() { return __increment(); } 
- 
-  __dir_element_proxy operator++(int) { 
-    __dir_element_proxy __p(**this); 
-    __increment(); 
-    return __p; 
-  } 
- 
-  directory_iterator& increment(error_code& __ec) { return __increment(&__ec); } 
- 
-private: 
-  inline _LIBCPP_INLINE_VISIBILITY friend bool 
-  operator==(const directory_iterator& __lhs, 
-             const directory_iterator& __rhs) noexcept; 
- 
-  // construct the dir_stream 
-  _LIBCPP_FUNC_VIS 
-  directory_iterator(const path&, error_code*, 
-                     directory_options = directory_options::none); 
- 
-  _LIBCPP_FUNC_VIS 
-  directory_iterator& __increment(error_code* __ec = nullptr); 
- 
-  _LIBCPP_FUNC_VIS 
-  const directory_entry& __dereference() const; 
- 
-private: 
-  shared_ptr<__dir_stream> __imp_; 
-}; 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool 
-operator==(const directory_iterator& __lhs, 
-           const directory_iterator& __rhs) noexcept { 
-  return __lhs.__imp_ == __rhs.__imp_; 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool 
-operator!=(const directory_iterator& __lhs, 
-           const directory_iterator& __rhs) noexcept { 
-  return !(__lhs == __rhs); 
-} 
- 
-// enable directory_iterator range-based for statements 
-inline _LIBCPP_INLINE_VISIBILITY directory_iterator 
-begin(directory_iterator __iter) noexcept { 
-  return __iter; 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY directory_iterator 
-end(const directory_iterator&) noexcept { 
-  return directory_iterator(); 
-} 
- 
-class recursive_directory_iterator { 
-public: 
-  using value_type = directory_entry; 
-  using difference_type = ptrdiff_t; 
-  using pointer = directory_entry const*; 
-  using reference = directory_entry const&; 
-  using iterator_category = input_iterator_tag; 
- 
-public: 
-  // constructors and destructor 
-  _LIBCPP_INLINE_VISIBILITY 
-  recursive_directory_iterator() noexcept : __rec_(false) {} 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  explicit recursive_directory_iterator( 
-      const path& __p, directory_options __xoptions = directory_options::none) 
-      : recursive_directory_iterator(__p, __xoptions, nullptr) {} 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  recursive_directory_iterator(const path& __p, directory_options __xoptions, 
-                               error_code& __ec) 
-      : recursive_directory_iterator(__p, __xoptions, &__ec) {} 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  recursive_directory_iterator(const path& __p, error_code& __ec) 
-      : recursive_directory_iterator(__p, directory_options::none, &__ec) {} 
- 
-  recursive_directory_iterator(const recursive_directory_iterator&) = default; 
-  recursive_directory_iterator(recursive_directory_iterator&&) = default; 
- 
-  recursive_directory_iterator& 
-  operator=(const recursive_directory_iterator&) = default; 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  recursive_directory_iterator& 
-  operator=(recursive_directory_iterator&& __o) noexcept { 
-    // non-default implementation provided to support self-move assign. 
-    if (this != &__o) { 
-      __imp_ = _VSTD::move(__o.__imp_); 
-      __rec_ = __o.__rec_; 
-    } 
-    return *this; 
-  } 
- 
-  ~recursive_directory_iterator() = default; 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  const directory_entry& operator*() const { return __dereference(); } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  const directory_entry* operator->() const { return &__dereference(); } 
- 
-  recursive_directory_iterator& operator++() { return __increment(); } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  __dir_element_proxy operator++(int) { 
-    __dir_element_proxy __p(**this); 
-    __increment(); 
-    return __p; 
-  } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  recursive_directory_iterator& increment(error_code& __ec) { 
-    return __increment(&__ec); 
-  } 
- 
-  _LIBCPP_FUNC_VIS directory_options options() const; 
-  _LIBCPP_FUNC_VIS int depth() const; 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  void pop() { __pop(); } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  void pop(error_code& __ec) { __pop(&__ec); } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  bool recursion_pending() const { return __rec_; } 
- 
-  _LIBCPP_INLINE_VISIBILITY 
-  void disable_recursion_pending() { __rec_ = false; } 
- 
-private: 
-  _LIBCPP_FUNC_VIS 
-  recursive_directory_iterator(const path& __p, directory_options __opt, 
-                               error_code* __ec); 
- 
-  _LIBCPP_FUNC_VIS 
-  const directory_entry& __dereference() const; 
- 
-  _LIBCPP_FUNC_VIS 
-  bool __try_recursion(error_code* __ec); 
- 
-  _LIBCPP_FUNC_VIS 
-  void __advance(error_code* __ec = nullptr); 
- 
-  _LIBCPP_FUNC_VIS 
-  recursive_directory_iterator& __increment(error_code* __ec = nullptr); 
- 
-  _LIBCPP_FUNC_VIS 
-  void __pop(error_code* __ec = nullptr); 
- 
-  inline _LIBCPP_INLINE_VISIBILITY friend bool 
-  operator==(const recursive_directory_iterator&, 
-             const recursive_directory_iterator&) noexcept; 
- 
-  struct _LIBCPP_HIDDEN __shared_imp; 
-  shared_ptr<__shared_imp> __imp_; 
-  bool __rec_; 
-}; // class recursive_directory_iterator 
- 
-inline _LIBCPP_INLINE_VISIBILITY bool 
-operator==(const recursive_directory_iterator& __lhs, 
-           const recursive_directory_iterator& __rhs) noexcept { 
-  return __lhs.__imp_ == __rhs.__imp_; 
-} 
- 
-_LIBCPP_INLINE_VISIBILITY 
-inline bool operator!=(const recursive_directory_iterator& __lhs, 
-                       const recursive_directory_iterator& __rhs) noexcept { 
-  return !(__lhs == __rhs); 
-} 
-// enable recursive_directory_iterator range-based for statements 
-inline _LIBCPP_INLINE_VISIBILITY recursive_directory_iterator 
-begin(recursive_directory_iterator __iter) noexcept { 
-  return __iter; 
-} 
- 
-inline _LIBCPP_INLINE_VISIBILITY recursive_directory_iterator 
-end(const recursive_directory_iterator&) noexcept { 
-  return recursive_directory_iterator(); 
-} 
- 
-_LIBCPP_AVAILABILITY_FILESYSTEM_POP 
- 
-_LIBCPP_END_NAMESPACE_FILESYSTEM 
- 
-#endif // !_LIBCPP_CXX03_LANG 
- 
-#ifdef _LIBCPP_COMPILER_MSVC 
-#pragma warning ( pop ) 
-#endif 
- 
-_LIBCPP_POP_MACROS 
- 
-#endif // _LIBCPP_FILESYSTEM 
+private:
+  inline _LIBCPP_INLINE_VISIBILITY path&
+  __assign_view(__string_view const& __s) noexcept {
+    __pn_ = string_type(__s);
+    return *this;
+  }
+  string_type __pn_;
+};
+
+inline _LIBCPP_INLINE_VISIBILITY void swap(path& __lhs, path& __rhs) noexcept {
+  __lhs.swap(__rhs);
+}
+
+_LIBCPP_FUNC_VIS
+size_t hash_value(const path& __p) noexcept;
+
+template <class _InputIt>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_DEPRECATED_WITH_CHAR8_T
+    typename enable_if<__is_pathable<_InputIt>::value, path>::type
+    u8path(_InputIt __f, _InputIt __l) {
+  static_assert(
+#ifndef _LIBCPP_HAS_NO_CHAR8_T
+      is_same<typename __is_pathable<_InputIt>::__char_type, char8_t>::value ||
+#endif
+      is_same<typename __is_pathable<_InputIt>::__char_type, char>::value,
+      "u8path(Iter, Iter) requires Iter have a value_type of type 'char'"
+      " or 'char8_t'");
+#if defined(_LIBCPP_WIN32API)
+  string __tmp(__f, __l);
+  using _CVT = __widen_from_utf8<sizeof(wchar_t) * __CHAR_BIT__>;
+  _VSTD::wstring __w;
+  __w.reserve(__tmp.size());
+  _CVT()(back_inserter(__w), __tmp.data(), __tmp.data() + __tmp.size());
+  return path(__w);
+#else
+  return path(__f, __l);
+#endif /* !_LIBCPP_WIN32API */
+}
+
+#if defined(_LIBCPP_WIN32API)
+template <class _InputIt>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_DEPRECATED_WITH_CHAR8_T
+    typename enable_if<__is_pathable<_InputIt>::value, path>::type
+    u8path(_InputIt __f, _NullSentinel) {
+  static_assert(
+#ifndef _LIBCPP_HAS_NO_CHAR8_T
+      is_same<typename __is_pathable<_InputIt>::__char_type, char8_t>::value ||
+#endif
+      is_same<typename __is_pathable<_InputIt>::__char_type, char>::value,
+      "u8path(Iter, Iter) requires Iter have a value_type of type 'char'"
+      " or 'char8_t'");
+  string __tmp;
+  const char __sentinel = char{};
+  for (; *__f != __sentinel; ++__f)
+    __tmp.push_back(*__f);
+  using _CVT = __widen_from_utf8<sizeof(wchar_t) * __CHAR_BIT__>;
+  _VSTD::wstring __w;
+  __w.reserve(__tmp.size());
+  _CVT()(back_inserter(__w), __tmp.data(), __tmp.data() + __tmp.size());
+  return path(__w);
+}
+#endif /* _LIBCPP_WIN32API */
+
+template <class _Source>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_DEPRECATED_WITH_CHAR8_T
+    typename enable_if<__is_pathable<_Source>::value, path>::type
+    u8path(const _Source& __s) {
+  static_assert(
+#ifndef _LIBCPP_HAS_NO_CHAR8_T
+      is_same<typename __is_pathable<_Source>::__char_type, char8_t>::value ||
+#endif
+      is_same<typename __is_pathable<_Source>::__char_type, char>::value,
+      "u8path(Source const&) requires Source have a character type of type "
+      "'char' or 'char8_t'");
+#if defined(_LIBCPP_WIN32API)
+  using _Traits = __is_pathable<_Source>;
+  return u8path(_VSTD::__unwrap_iter(_Traits::__range_begin(__s)), _VSTD::__unwrap_iter(_Traits::__range_end(__s)));
+#else
+  return path(__s);
+#endif
+}
+
+class _LIBCPP_TYPE_VIS path::iterator {
+public:
+  enum _ParserState : unsigned char {
+    _Singular,
+    _BeforeBegin,
+    _InRootName,
+    _InRootDir,
+    _InFilenames,
+    _InTrailingSep,
+    _AtEnd
+  };
+
+public:
+  typedef bidirectional_iterator_tag iterator_category;
+
+  typedef path value_type;
+  typedef ptrdiff_t difference_type;
+  typedef const path* pointer;
+  typedef const path& reference;
+
+  typedef void
+      __stashing_iterator_tag; // See reverse_iterator and __is_stashing_iterator
+
+public:
+  _LIBCPP_INLINE_VISIBILITY
+  iterator()
+      : __stashed_elem_(), __path_ptr_(nullptr), __entry_(),
+        __state_(_Singular) {}
+
+  iterator(const iterator&) = default;
+  ~iterator() = default;
+
+  iterator& operator=(const iterator&) = default;
+
+  _LIBCPP_INLINE_VISIBILITY
+  reference operator*() const { return __stashed_elem_; }
+
+  _LIBCPP_INLINE_VISIBILITY
+  pointer operator->() const { return &__stashed_elem_; }
+
+  _LIBCPP_INLINE_VISIBILITY
+  iterator& operator++() {
+    _LIBCPP_ASSERT(__state_ != _Singular,
+                   "attempting to increment a singular iterator");
+    _LIBCPP_ASSERT(__state_ != _AtEnd,
+                   "attempting to increment the end iterator");
+    return __increment();
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  iterator operator++(int) {
+    iterator __it(*this);
+    this->operator++();
+    return __it;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  iterator& operator--() {
+    _LIBCPP_ASSERT(__state_ != _Singular,
+                   "attempting to decrement a singular iterator");
+    _LIBCPP_ASSERT(__entry_.data() != __path_ptr_->native().data(),
+                   "attempting to decrement the begin iterator");
+    return __decrement();
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  iterator operator--(int) {
+    iterator __it(*this);
+    this->operator--();
+    return __it;
+  }
+
+private:
+  friend class path;
+
+  inline _LIBCPP_INLINE_VISIBILITY friend bool operator==(const iterator&,
+                                                          const iterator&);
+
+  iterator& __increment();
+  iterator& __decrement();
+
+  path __stashed_elem_;
+  const path* __path_ptr_;
+  path::__string_view __entry_;
+  _ParserState __state_;
+};
+
+inline _LIBCPP_INLINE_VISIBILITY bool operator==(const path::iterator& __lhs,
+                                                 const path::iterator& __rhs) {
+  return __lhs.__path_ptr_ == __rhs.__path_ptr_ &&
+         __lhs.__entry_.data() == __rhs.__entry_.data();
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool operator!=(const path::iterator& __lhs,
+                                                 const path::iterator& __rhs) {
+  return !(__lhs == __rhs);
+}
+
+// TODO(ldionne): We need to pop the pragma and push it again after
+//                filesystem_error to work around PR41078.
+_LIBCPP_AVAILABILITY_FILESYSTEM_POP
+
+class _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_EXCEPTION_ABI filesystem_error : public system_error {
+public:
+  _LIBCPP_INLINE_VISIBILITY
+  filesystem_error(const string& __what, error_code __ec)
+      : system_error(__ec, __what),
+        __storage_(make_shared<_Storage>(path(), path())) {
+    __create_what(0);
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  filesystem_error(const string& __what, const path& __p1, error_code __ec)
+      : system_error(__ec, __what),
+        __storage_(make_shared<_Storage>(__p1, path())) {
+    __create_what(1);
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  filesystem_error(const string& __what, const path& __p1, const path& __p2,
+                   error_code __ec)
+      : system_error(__ec, __what),
+        __storage_(make_shared<_Storage>(__p1, __p2)) {
+    __create_what(2);
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  const path& path1() const noexcept { return __storage_->__p1_; }
+
+  _LIBCPP_INLINE_VISIBILITY
+  const path& path2() const noexcept { return __storage_->__p2_; }
+
+  filesystem_error(const filesystem_error&) = default;
+  ~filesystem_error() override; // key function
+
+  _LIBCPP_INLINE_VISIBILITY
+  const char* what() const noexcept override {
+    return __storage_->__what_.c_str();
+  }
+
+  void __create_what(int __num_paths);
+
+private:
+  struct _LIBCPP_HIDDEN _Storage {
+    _LIBCPP_INLINE_VISIBILITY
+    _Storage(const path& __p1, const path& __p2) : __p1_(__p1), __p2_(__p2) {}
+
+    path __p1_;
+    path __p2_;
+    string __what_;
+  };
+  shared_ptr<_Storage> __storage_;
+};
+
+_LIBCPP_AVAILABILITY_FILESYSTEM_PUSH
+
+template <class... _Args>
+_LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
+#ifndef _LIBCPP_NO_EXCEPTIONS
+void __throw_filesystem_error(_Args&&... __args) {
+  throw filesystem_error(_VSTD::forward<_Args>(__args)...);
+}
+#else
+void __throw_filesystem_error(_Args&&...) {
+  _VSTD::abort();
+}
+#endif
+
+// operational functions
+
+_LIBCPP_FUNC_VIS
+path __absolute(const path&, error_code* __ec = nullptr);
+_LIBCPP_FUNC_VIS
+path __canonical(const path&, error_code* __ec = nullptr);
+_LIBCPP_FUNC_VIS
+void __copy(const path& __from, const path& __to, copy_options __opt,
+            error_code* __ec = nullptr);
+_LIBCPP_FUNC_VIS
+bool __copy_file(const path& __from, const path& __to, copy_options __opt,
+                 error_code* __ec = nullptr);
+_LIBCPP_FUNC_VIS
+void __copy_symlink(const path& __existing_symlink, const path& __new_symlink,
+                    error_code* __ec = nullptr);
+_LIBCPP_FUNC_VIS
+bool __create_directories(const path& p, error_code* ec = nullptr);
+_LIBCPP_FUNC_VIS
+bool __create_directory(const path& p, error_code* ec = nullptr);
+_LIBCPP_FUNC_VIS
+bool __create_directory(const path& p, const path& attributes,
+                        error_code* ec = nullptr);
+_LIBCPP_FUNC_VIS
+void __create_directory_symlink(const path& __to, const path& __new_symlink,
+                                error_code* __ec = nullptr);
+_LIBCPP_FUNC_VIS
+void __create_hard_link(const path& __to, const path& __new_hard_link,
+                        error_code* __ec = nullptr);
+_LIBCPP_FUNC_VIS
+void __create_symlink(const path& __to, const path& __new_symlink,
+                      error_code* __ec = nullptr);
+_LIBCPP_FUNC_VIS
+path __current_path(error_code* __ec = nullptr);
+_LIBCPP_FUNC_VIS
+void __current_path(const path&, error_code* __ec = nullptr);
+_LIBCPP_FUNC_VIS
+bool __equivalent(const path&, const path&, error_code* __ec = nullptr);
+_LIBCPP_FUNC_VIS
+uintmax_t __file_size(const path&, error_code* __ec = nullptr);
+_LIBCPP_FUNC_VIS
+uintmax_t __hard_link_count(const path&, error_code* __ec = nullptr);
+_LIBCPP_FUNC_VIS
+bool __fs_is_empty(const path& p, error_code* ec = nullptr);
+_LIBCPP_FUNC_VIS
+file_time_type __last_write_time(const path& p, error_code* ec = nullptr);
+_LIBCPP_FUNC_VIS
+void __last_write_time(const path& p, file_time_type new_time,
+                       error_code* ec = nullptr);
+_LIBCPP_FUNC_VIS
+void __permissions(const path&, perms, perm_options, error_code* = nullptr);
+_LIBCPP_FUNC_VIS
+path __read_symlink(const path& p, error_code* ec = nullptr);
+_LIBCPP_FUNC_VIS
+bool __remove(const path& p, error_code* ec = nullptr);
+_LIBCPP_FUNC_VIS
+uintmax_t __remove_all(const path& p, error_code* ec = nullptr);
+_LIBCPP_FUNC_VIS
+void __rename(const path& from, const path& to, error_code* ec = nullptr);
+_LIBCPP_FUNC_VIS
+void __resize_file(const path& p, uintmax_t size, error_code* ec = nullptr);
+_LIBCPP_FUNC_VIS
+space_info __space(const path&, error_code* __ec = nullptr);
+_LIBCPP_FUNC_VIS
+file_status __status(const path&, error_code* __ec = nullptr);
+_LIBCPP_FUNC_VIS
+file_status __symlink_status(const path&, error_code* __ec = nullptr);
+_LIBCPP_FUNC_VIS
+path __system_complete(const path&, error_code* __ec = nullptr);
+_LIBCPP_FUNC_VIS
+path __temp_directory_path(error_code* __ec = nullptr);
+_LIBCPP_FUNC_VIS
+path __weakly_canonical(path const& __p, error_code* __ec = nullptr);
+
+inline _LIBCPP_INLINE_VISIBILITY path current_path() {
+  return __current_path();
+}
+
+inline _LIBCPP_INLINE_VISIBILITY path current_path(error_code& __ec) {
+  return __current_path(&__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void current_path(const path& __p) {
+  __current_path(__p);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void current_path(const path& __p,
+                                                   error_code& __ec) noexcept {
+  __current_path(__p, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY path absolute(const path& __p) {
+  return __absolute(__p);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY path absolute(const path& __p,
+                                               error_code& __ec) {
+  return __absolute(__p, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY path canonical(const path& __p) {
+  return __canonical(__p);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY path canonical(const path& __p,
+                                                error_code& __ec) {
+  return __canonical(__p, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void copy(const path& __from,
+                                           const path& __to) {
+  __copy(__from, __to, copy_options::none);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void copy(const path& __from, const path& __to,
+                                           error_code& __ec) {
+  __copy(__from, __to, copy_options::none, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void copy(const path& __from, const path& __to,
+                                           copy_options __opt) {
+  __copy(__from, __to, __opt);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void copy(const path& __from, const path& __to,
+                                           copy_options __opt,
+                                           error_code& __ec) {
+  __copy(__from, __to, __opt, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool copy_file(const path& __from,
+                                                const path& __to) {
+  return __copy_file(__from, __to, copy_options::none);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool
+copy_file(const path& __from, const path& __to, error_code& __ec) {
+  return __copy_file(__from, __to, copy_options::none, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool
+copy_file(const path& __from, const path& __to, copy_options __opt) {
+  return __copy_file(__from, __to, __opt);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool copy_file(const path& __from,
+                                                const path& __to,
+                                                copy_options __opt,
+                                                error_code& __ec) {
+  return __copy_file(__from, __to, __opt, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void copy_symlink(const path& __existing,
+                                                   const path& __new) {
+  __copy_symlink(__existing, __new);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void
+copy_symlink(const path& __ext, const path& __new, error_code& __ec) noexcept {
+  __copy_symlink(__ext, __new, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool create_directories(const path& __p) {
+  return __create_directories(__p);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool create_directories(const path& __p,
+                                                         error_code& __ec) {
+  return __create_directories(__p, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool create_directory(const path& __p) {
+  return __create_directory(__p);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool
+create_directory(const path& __p, error_code& __ec) noexcept {
+  return __create_directory(__p, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool create_directory(const path& __p,
+                                                       const path& __attrs) {
+  return __create_directory(__p, __attrs);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool
+create_directory(const path& __p, const path& __attrs,
+                 error_code& __ec) noexcept {
+  return __create_directory(__p, __attrs, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void
+create_directory_symlink(const path& __to, const path& __new) {
+  __create_directory_symlink(__to, __new);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void
+create_directory_symlink(const path& __to, const path& __new,
+                         error_code& __ec) noexcept {
+  __create_directory_symlink(__to, __new, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void create_hard_link(const path& __to,
+                                                       const path& __new) {
+  __create_hard_link(__to, __new);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void
+create_hard_link(const path& __to, const path& __new,
+                 error_code& __ec) noexcept {
+  __create_hard_link(__to, __new, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void create_symlink(const path& __to,
+                                                     const path& __new) {
+  __create_symlink(__to, __new);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void
+create_symlink(const path& __to, const path& __new, error_code& __ec) noexcept {
+  return __create_symlink(__to, __new, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool status_known(file_status __s) noexcept {
+  return __s.type() != file_type::none;
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool exists(file_status __s) noexcept {
+  return status_known(__s) && __s.type() != file_type::not_found;
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool exists(const path& __p) {
+  return exists(__status(__p));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool exists(const path& __p,
+                                             error_code& __ec) noexcept {
+  auto __s = __status(__p, &__ec);
+  if (status_known(__s))
+    __ec.clear();
+  return exists(__s);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool equivalent(const path& __p1,
+                                                 const path& __p2) {
+  return __equivalent(__p1, __p2);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool
+equivalent(const path& __p1, const path& __p2, error_code& __ec) noexcept {
+  return __equivalent(__p1, __p2, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY uintmax_t file_size(const path& __p) {
+  return __file_size(__p);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY uintmax_t
+file_size(const path& __p, error_code& __ec) noexcept {
+  return __file_size(__p, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY uintmax_t hard_link_count(const path& __p) {
+  return __hard_link_count(__p);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY uintmax_t
+hard_link_count(const path& __p, error_code& __ec) noexcept {
+  return __hard_link_count(__p, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_block_file(file_status __s) noexcept {
+  return __s.type() == file_type::block;
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_block_file(const path& __p) {
+  return is_block_file(__status(__p));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_block_file(const path& __p,
+                                                    error_code& __ec) noexcept {
+  return is_block_file(__status(__p, &__ec));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool
+is_character_file(file_status __s) noexcept {
+  return __s.type() == file_type::character;
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_character_file(const path& __p) {
+  return is_character_file(__status(__p));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool
+is_character_file(const path& __p, error_code& __ec) noexcept {
+  return is_character_file(__status(__p, &__ec));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_directory(file_status __s) noexcept {
+  return __s.type() == file_type::directory;
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_directory(const path& __p) {
+  return is_directory(__status(__p));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_directory(const path& __p,
+                                                   error_code& __ec) noexcept {
+  return is_directory(__status(__p, &__ec));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_empty(const path& __p) {
+  return __fs_is_empty(__p);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_empty(const path& __p,
+                                               error_code& __ec) {
+  return __fs_is_empty(__p, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_fifo(file_status __s) noexcept {
+  return __s.type() == file_type::fifo;
+}
+inline _LIBCPP_INLINE_VISIBILITY bool is_fifo(const path& __p) {
+  return is_fifo(__status(__p));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_fifo(const path& __p,
+                                              error_code& __ec) noexcept {
+  return is_fifo(__status(__p, &__ec));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool
+is_regular_file(file_status __s) noexcept {
+  return __s.type() == file_type::regular;
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_regular_file(const path& __p) {
+  return is_regular_file(__status(__p));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool
+is_regular_file(const path& __p, error_code& __ec) noexcept {
+  return is_regular_file(__status(__p, &__ec));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_socket(file_status __s) noexcept {
+  return __s.type() == file_type::socket;
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_socket(const path& __p) {
+  return is_socket(__status(__p));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_socket(const path& __p,
+                                                error_code& __ec) noexcept {
+  return is_socket(__status(__p, &__ec));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_symlink(file_status __s) noexcept {
+  return __s.type() == file_type::symlink;
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_symlink(const path& __p) {
+  return is_symlink(__symlink_status(__p));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_symlink(const path& __p,
+                                                 error_code& __ec) noexcept {
+  return is_symlink(__symlink_status(__p, &__ec));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_other(file_status __s) noexcept {
+  return exists(__s) && !is_regular_file(__s) && !is_directory(__s) &&
+         !is_symlink(__s);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_other(const path& __p) {
+  return is_other(__status(__p));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool is_other(const path& __p,
+                                               error_code& __ec) noexcept {
+  return is_other(__status(__p, &__ec));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY file_time_type
+last_write_time(const path& __p) {
+  return __last_write_time(__p);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY file_time_type
+last_write_time(const path& __p, error_code& __ec) noexcept {
+  return __last_write_time(__p, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void last_write_time(const path& __p,
+                                                      file_time_type __t) {
+  __last_write_time(__p, __t);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void
+last_write_time(const path& __p, file_time_type __t,
+                error_code& __ec) noexcept {
+  __last_write_time(__p, __t, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void
+permissions(const path& __p, perms __prms,
+            perm_options __opts = perm_options::replace) {
+  __permissions(__p, __prms, __opts);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void permissions(const path& __p, perms __prms,
+                                                  error_code& __ec) noexcept {
+  __permissions(__p, __prms, perm_options::replace, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void permissions(const path& __p, perms __prms,
+                                                  perm_options __opts,
+                                                  error_code& __ec) {
+  __permissions(__p, __prms, __opts, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY path proximate(const path& __p,
+                                                const path& __base,
+                                                error_code& __ec) {
+  path __tmp = __weakly_canonical(__p, &__ec);
+  if (__ec)
+    return {};
+  path __tmp_base = __weakly_canonical(__base, &__ec);
+  if (__ec)
+    return {};
+  return __tmp.lexically_proximate(__tmp_base);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY path proximate(const path& __p,
+                                                error_code& __ec) {
+  return proximate(__p, current_path(), __ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY path
+proximate(const path& __p, const path& __base = current_path()) {
+  return __weakly_canonical(__p).lexically_proximate(
+      __weakly_canonical(__base));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY path read_symlink(const path& __p) {
+  return __read_symlink(__p);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY path read_symlink(const path& __p,
+                                                   error_code& __ec) {
+  return __read_symlink(__p, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY path relative(const path& __p,
+                                               const path& __base,
+                                               error_code& __ec) {
+  path __tmp = __weakly_canonical(__p, &__ec);
+  if (__ec)
+    return path();
+  path __tmpbase = __weakly_canonical(__base, &__ec);
+  if (__ec)
+    return path();
+  return __tmp.lexically_relative(__tmpbase);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY path relative(const path& __p,
+                                               error_code& __ec) {
+  return relative(__p, current_path(), __ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY path
+relative(const path& __p, const path& __base = current_path()) {
+  return __weakly_canonical(__p).lexically_relative(__weakly_canonical(__base));
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool remove(const path& __p) {
+  return __remove(__p);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool remove(const path& __p,
+                                             error_code& __ec) noexcept {
+  return __remove(__p, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY uintmax_t remove_all(const path& __p) {
+  return __remove_all(__p);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY uintmax_t remove_all(const path& __p,
+                                                      error_code& __ec) {
+  return __remove_all(__p, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void rename(const path& __from,
+                                             const path& __to) {
+  return __rename(__from, __to);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void
+rename(const path& __from, const path& __to, error_code& __ec) noexcept {
+  return __rename(__from, __to, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void resize_file(const path& __p,
+                                                  uintmax_t __ns) {
+  return __resize_file(__p, __ns);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY void
+resize_file(const path& __p, uintmax_t __ns, error_code& __ec) noexcept {
+  return __resize_file(__p, __ns, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY space_info space(const path& __p) {
+  return __space(__p);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY space_info space(const path& __p,
+                                                  error_code& __ec) noexcept {
+  return __space(__p, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY file_status status(const path& __p) {
+  return __status(__p);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY file_status status(const path& __p,
+                                                    error_code& __ec) noexcept {
+  return __status(__p, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY file_status symlink_status(const path& __p) {
+  return __symlink_status(__p);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY file_status
+symlink_status(const path& __p, error_code& __ec) noexcept {
+  return __symlink_status(__p, &__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY path temp_directory_path() {
+  return __temp_directory_path();
+}
+
+inline _LIBCPP_INLINE_VISIBILITY path temp_directory_path(error_code& __ec) {
+  return __temp_directory_path(&__ec);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY path weakly_canonical(path const& __p) {
+  return __weakly_canonical(__p);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY path weakly_canonical(path const& __p,
+                                                       error_code& __ec) {
+  return __weakly_canonical(__p, &__ec);
+}
+
+class directory_iterator;
+class recursive_directory_iterator;
+class _LIBCPP_HIDDEN __dir_stream;
+
+class directory_entry {
+  typedef _VSTD_FS::path _Path;
+
+public:
+  // constructors and destructors
+  directory_entry() noexcept = default;
+  directory_entry(directory_entry const&) = default;
+  directory_entry(directory_entry&&) noexcept = default;
+
+  _LIBCPP_INLINE_VISIBILITY
+  explicit directory_entry(_Path const& __p) : __p_(__p) {
+    error_code __ec;
+    __refresh(&__ec);
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  directory_entry(_Path const& __p, error_code& __ec) : __p_(__p) {
+    __refresh(&__ec);
+  }
+
+  ~directory_entry() {}
+
+  directory_entry& operator=(directory_entry const&) = default;
+  directory_entry& operator=(directory_entry&&) noexcept = default;
+
+  _LIBCPP_INLINE_VISIBILITY
+  void assign(_Path const& __p) {
+    __p_ = __p;
+    error_code __ec;
+    __refresh(&__ec);
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  void assign(_Path const& __p, error_code& __ec) {
+    __p_ = __p;
+    __refresh(&__ec);
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  void replace_filename(_Path const& __p) {
+    __p_.replace_filename(__p);
+    error_code __ec;
+    __refresh(&__ec);
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  void replace_filename(_Path const& __p, error_code& __ec) {
+    __p_ = __p_.parent_path() / __p;
+    __refresh(&__ec);
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  void refresh() { __refresh(); }
+
+  _LIBCPP_INLINE_VISIBILITY
+  void refresh(error_code& __ec) noexcept { __refresh(&__ec); }
+
+  _LIBCPP_INLINE_VISIBILITY
+  _Path const& path() const noexcept { return __p_; }
+
+  _LIBCPP_INLINE_VISIBILITY
+  operator const _Path&() const noexcept { return __p_; }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool exists() const { return _VSTD_FS::exists(file_status{__get_ft()}); }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool exists(error_code& __ec) const noexcept {
+    return _VSTD_FS::exists(file_status{__get_ft(&__ec)});
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool is_block_file() const { return __get_ft() == file_type::block; }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool is_block_file(error_code& __ec) const noexcept {
+    return __get_ft(&__ec) == file_type::block;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool is_character_file() const { return __get_ft() == file_type::character; }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool is_character_file(error_code& __ec) const noexcept {
+    return __get_ft(&__ec) == file_type::character;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool is_directory() const { return __get_ft() == file_type::directory; }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool is_directory(error_code& __ec) const noexcept {
+    return __get_ft(&__ec) == file_type::directory;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool is_fifo() const { return __get_ft() == file_type::fifo; }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool is_fifo(error_code& __ec) const noexcept {
+    return __get_ft(&__ec) == file_type::fifo;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool is_other() const { return _VSTD_FS::is_other(file_status{__get_ft()}); }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool is_other(error_code& __ec) const noexcept {
+    return _VSTD_FS::is_other(file_status{__get_ft(&__ec)});
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool is_regular_file() const { return __get_ft() == file_type::regular; }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool is_regular_file(error_code& __ec) const noexcept {
+    return __get_ft(&__ec) == file_type::regular;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool is_socket() const { return __get_ft() == file_type::socket; }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool is_socket(error_code& __ec) const noexcept {
+    return __get_ft(&__ec) == file_type::socket;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool is_symlink() const { return __get_sym_ft() == file_type::symlink; }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool is_symlink(error_code& __ec) const noexcept {
+    return __get_sym_ft(&__ec) == file_type::symlink;
+  }
+  _LIBCPP_INLINE_VISIBILITY
+  uintmax_t file_size() const { return __get_size(); }
+
+  _LIBCPP_INLINE_VISIBILITY
+  uintmax_t file_size(error_code& __ec) const noexcept {
+    return __get_size(&__ec);
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  uintmax_t hard_link_count() const { return __get_nlink(); }
+
+  _LIBCPP_INLINE_VISIBILITY
+  uintmax_t hard_link_count(error_code& __ec) const noexcept {
+    return __get_nlink(&__ec);
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  file_time_type last_write_time() const { return __get_write_time(); }
+
+  _LIBCPP_INLINE_VISIBILITY
+  file_time_type last_write_time(error_code& __ec) const noexcept {
+    return __get_write_time(&__ec);
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  file_status status() const { return __get_status(); }
+
+  _LIBCPP_INLINE_VISIBILITY
+  file_status status(error_code& __ec) const noexcept {
+    return __get_status(&__ec);
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  file_status symlink_status() const { return __get_symlink_status(); }
+
+  _LIBCPP_INLINE_VISIBILITY
+  file_status symlink_status(error_code& __ec) const noexcept {
+    return __get_symlink_status(&__ec);
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool operator<(directory_entry const& __rhs) const noexcept {
+    return __p_ < __rhs.__p_;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool operator==(directory_entry const& __rhs) const noexcept {
+    return __p_ == __rhs.__p_;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool operator!=(directory_entry const& __rhs) const noexcept {
+    return __p_ != __rhs.__p_;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool operator<=(directory_entry const& __rhs) const noexcept {
+    return __p_ <= __rhs.__p_;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool operator>(directory_entry const& __rhs) const noexcept {
+    return __p_ > __rhs.__p_;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool operator>=(directory_entry const& __rhs) const noexcept {
+    return __p_ >= __rhs.__p_;
+  }
+
+private:
+  friend class directory_iterator;
+  friend class recursive_directory_iterator;
+  friend class __dir_stream;
+
+  enum _CacheType : unsigned char {
+    _Empty,
+    _IterSymlink,
+    _IterNonSymlink,
+    _RefreshSymlink,
+    _RefreshSymlinkUnresolved,
+    _RefreshNonSymlink
+  };
+
+  struct __cached_data {
+    uintmax_t __size_;
+    uintmax_t __nlink_;
+    file_time_type __write_time_;
+    perms __sym_perms_;
+    perms __non_sym_perms_;
+    file_type __type_;
+    _CacheType __cache_type_;
+
+    _LIBCPP_INLINE_VISIBILITY
+    __cached_data() noexcept { __reset(); }
+
+    _LIBCPP_INLINE_VISIBILITY
+    void __reset() {
+      __cache_type_ = _Empty;
+      __type_ = file_type::none;
+      __sym_perms_ = __non_sym_perms_ = perms::unknown;
+      __size_ = __nlink_ = uintmax_t(-1);
+      __write_time_ = file_time_type::min();
+    }
+  };
+
+  _LIBCPP_INLINE_VISIBILITY
+  static __cached_data __create_iter_result(file_type __ft) {
+    __cached_data __data;
+    __data.__type_ = __ft;
+    __data.__cache_type_ = [&]() {
+      switch (__ft) {
+      case file_type::none:
+        return _Empty;
+      case file_type::symlink:
+        return _IterSymlink;
+      default:
+        return _IterNonSymlink;
+      }
+    }();
+    return __data;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  void __assign_iter_entry(_Path&& __p, __cached_data __dt) {
+    __p_ = _VSTD::move(__p);
+    __data_ = __dt;
+  }
+
+  _LIBCPP_FUNC_VIS
+  error_code __do_refresh() noexcept;
+
+  _LIBCPP_INLINE_VISIBILITY
+  static bool __is_dne_error(error_code const& __ec) {
+    if (!__ec)
+      return true;
+    switch (static_cast<errc>(__ec.value())) {
+    case errc::no_such_file_or_directory:
+    case errc::not_a_directory:
+      return true;
+    default:
+      return false;
+    }
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  void __handle_error(const char* __msg, error_code* __dest_ec,
+                      error_code const& __ec, bool __allow_dne = false) const {
+    if (__dest_ec) {
+      *__dest_ec = __ec;
+      return;
+    }
+    if (__ec && (!__allow_dne || !__is_dne_error(__ec)))
+      __throw_filesystem_error(__msg, __p_, __ec);
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  void __refresh(error_code* __ec = nullptr) {
+    __handle_error("in directory_entry::refresh", __ec, __do_refresh(),
+                   /*allow_dne*/ true);
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  file_type __get_sym_ft(error_code* __ec = nullptr) const {
+    switch (__data_.__cache_type_) {
+    case _Empty:
+      return __symlink_status(__p_, __ec).type();
+    case _IterSymlink:
+    case _RefreshSymlink:
+    case _RefreshSymlinkUnresolved:
+      if (__ec)
+        __ec->clear();
+      return file_type::symlink;
+    case _IterNonSymlink:
+    case _RefreshNonSymlink:
+      file_status __st(__data_.__type_);
+      if (__ec && !_VSTD_FS::exists(__st))
+        *__ec = make_error_code(errc::no_such_file_or_directory);
+      else if (__ec)
+        __ec->clear();
+      return __data_.__type_;
+    }
+    _LIBCPP_UNREACHABLE();
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  file_type __get_ft(error_code* __ec = nullptr) const {
+    switch (__data_.__cache_type_) {
+    case _Empty:
+    case _IterSymlink:
+    case _RefreshSymlinkUnresolved:
+      return __status(__p_, __ec).type();
+    case _IterNonSymlink:
+    case _RefreshNonSymlink:
+    case _RefreshSymlink: {
+      file_status __st(__data_.__type_);
+      if (__ec && !_VSTD_FS::exists(__st))
+        *__ec = make_error_code(errc::no_such_file_or_directory);
+      else if (__ec)
+        __ec->clear();
+      return __data_.__type_;
+    }
+    }
+    _LIBCPP_UNREACHABLE();
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  file_status __get_status(error_code* __ec = nullptr) const {
+    switch (__data_.__cache_type_) {
+    case _Empty:
+    case _IterNonSymlink:
+    case _IterSymlink:
+    case _RefreshSymlinkUnresolved:
+      return __status(__p_, __ec);
+    case _RefreshNonSymlink:
+    case _RefreshSymlink:
+      return file_status(__get_ft(__ec), __data_.__non_sym_perms_);
+    }
+    _LIBCPP_UNREACHABLE();
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  file_status __get_symlink_status(error_code* __ec = nullptr) const {
+    switch (__data_.__cache_type_) {
+    case _Empty:
+    case _IterNonSymlink:
+    case _IterSymlink:
+      return __symlink_status(__p_, __ec);
+    case _RefreshNonSymlink:
+      return file_status(__get_sym_ft(__ec), __data_.__non_sym_perms_);
+    case _RefreshSymlink:
+    case _RefreshSymlinkUnresolved:
+      return file_status(__get_sym_ft(__ec), __data_.__sym_perms_);
+    }
+    _LIBCPP_UNREACHABLE();
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  uintmax_t __get_size(error_code* __ec = nullptr) const {
+    switch (__data_.__cache_type_) {
+    case _Empty:
+    case _IterNonSymlink:
+    case _IterSymlink:
+    case _RefreshSymlinkUnresolved:
+      return _VSTD_FS::__file_size(__p_, __ec);
+    case _RefreshSymlink:
+    case _RefreshNonSymlink: {
+      error_code __m_ec;
+      file_status __st(__get_ft(&__m_ec));
+      __handle_error("in directory_entry::file_size", __ec, __m_ec);
+      if (_VSTD_FS::exists(__st) && !_VSTD_FS::is_regular_file(__st)) {
+        errc __err_kind = _VSTD_FS::is_directory(__st) ? errc::is_a_directory
+                                                       : errc::not_supported;
+        __handle_error("in directory_entry::file_size", __ec,
+                       make_error_code(__err_kind));
+      }
+      return __data_.__size_;
+    }
+    }
+    _LIBCPP_UNREACHABLE();
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  uintmax_t __get_nlink(error_code* __ec = nullptr) const {
+    switch (__data_.__cache_type_) {
+    case _Empty:
+    case _IterNonSymlink:
+    case _IterSymlink:
+    case _RefreshSymlinkUnresolved:
+      return _VSTD_FS::__hard_link_count(__p_, __ec);
+    case _RefreshSymlink:
+    case _RefreshNonSymlink: {
+      error_code __m_ec;
+      (void)__get_ft(&__m_ec);
+      __handle_error("in directory_entry::hard_link_count", __ec, __m_ec);
+      return __data_.__nlink_;
+    }
+    }
+    _LIBCPP_UNREACHABLE();
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  file_time_type __get_write_time(error_code* __ec = nullptr) const {
+    switch (__data_.__cache_type_) {
+    case _Empty:
+    case _IterNonSymlink:
+    case _IterSymlink:
+    case _RefreshSymlinkUnresolved:
+      return _VSTD_FS::__last_write_time(__p_, __ec);
+    case _RefreshSymlink:
+    case _RefreshNonSymlink: {
+      error_code __m_ec;
+      file_status __st(__get_ft(&__m_ec));
+      __handle_error("in directory_entry::last_write_time", __ec, __m_ec);
+      if (_VSTD_FS::exists(__st) &&
+          __data_.__write_time_ == file_time_type::min())
+        __handle_error("in directory_entry::last_write_time", __ec,
+                       make_error_code(errc::value_too_large));
+      return __data_.__write_time_;
+    }
+    }
+    _LIBCPP_UNREACHABLE();
+  }
+
+private:
+  _Path __p_;
+  __cached_data __data_;
+};
+
+class __dir_element_proxy {
+public:
+  inline _LIBCPP_INLINE_VISIBILITY directory_entry operator*() {
+    return _VSTD::move(__elem_);
+  }
+
+private:
+  friend class directory_iterator;
+  friend class recursive_directory_iterator;
+  explicit __dir_element_proxy(directory_entry const& __e) : __elem_(__e) {}
+  __dir_element_proxy(__dir_element_proxy&& __o)
+      : __elem_(_VSTD::move(__o.__elem_)) {}
+  directory_entry __elem_;
+};
+
+class directory_iterator {
+public:
+  typedef directory_entry value_type;
+  typedef ptrdiff_t difference_type;
+  typedef value_type const* pointer;
+  typedef value_type const& reference;
+  typedef input_iterator_tag iterator_category;
+
+public:
+  //ctor & dtor
+  directory_iterator() noexcept {}
+
+  explicit directory_iterator(const path& __p)
+      : directory_iterator(__p, nullptr) {}
+
+  directory_iterator(const path& __p, directory_options __opts)
+      : directory_iterator(__p, nullptr, __opts) {}
+
+  directory_iterator(const path& __p, error_code& __ec)
+      : directory_iterator(__p, &__ec) {}
+
+  directory_iterator(const path& __p, directory_options __opts,
+                     error_code& __ec)
+      : directory_iterator(__p, &__ec, __opts) {}
+
+  directory_iterator(const directory_iterator&) = default;
+  directory_iterator(directory_iterator&&) = default;
+  directory_iterator& operator=(const directory_iterator&) = default;
+
+  directory_iterator& operator=(directory_iterator&& __o) noexcept {
+    // non-default implementation provided to support self-move assign.
+    if (this != &__o) {
+      __imp_ = _VSTD::move(__o.__imp_);
+    }
+    return *this;
+  }
+
+  ~directory_iterator() = default;
+
+  const directory_entry& operator*() const {
+    _LIBCPP_ASSERT(__imp_, "The end iterator cannot be dereferenced");
+    return __dereference();
+  }
+
+  const directory_entry* operator->() const { return &**this; }
+
+  directory_iterator& operator++() { return __increment(); }
+
+  __dir_element_proxy operator++(int) {
+    __dir_element_proxy __p(**this);
+    __increment();
+    return __p;
+  }
+
+  directory_iterator& increment(error_code& __ec) { return __increment(&__ec); }
+
+private:
+  inline _LIBCPP_INLINE_VISIBILITY friend bool
+  operator==(const directory_iterator& __lhs,
+             const directory_iterator& __rhs) noexcept;
+
+  // construct the dir_stream
+  _LIBCPP_FUNC_VIS
+  directory_iterator(const path&, error_code*,
+                     directory_options = directory_options::none);
+
+  _LIBCPP_FUNC_VIS
+  directory_iterator& __increment(error_code* __ec = nullptr);
+
+  _LIBCPP_FUNC_VIS
+  const directory_entry& __dereference() const;
+
+private:
+  shared_ptr<__dir_stream> __imp_;
+};
+
+inline _LIBCPP_INLINE_VISIBILITY bool
+operator==(const directory_iterator& __lhs,
+           const directory_iterator& __rhs) noexcept {
+  return __lhs.__imp_ == __rhs.__imp_;
+}
+
+inline _LIBCPP_INLINE_VISIBILITY bool
+operator!=(const directory_iterator& __lhs,
+           const directory_iterator& __rhs) noexcept {
+  return !(__lhs == __rhs);
+}
+
+// enable directory_iterator range-based for statements
+inline _LIBCPP_INLINE_VISIBILITY directory_iterator
+begin(directory_iterator __iter) noexcept {
+  return __iter;
+}
+
+inline _LIBCPP_INLINE_VISIBILITY directory_iterator
+end(const directory_iterator&) noexcept {
+  return directory_iterator();
+}
+
+class recursive_directory_iterator {
+public:
+  using value_type = directory_entry;
+  using difference_type = ptrdiff_t;
+  using pointer = directory_entry const*;
+  using reference = directory_entry const&;
+  using iterator_category = input_iterator_tag;
+
+public:
+  // constructors and destructor
+  _LIBCPP_INLINE_VISIBILITY
+  recursive_directory_iterator() noexcept : __rec_(false) {}
+
+  _LIBCPP_INLINE_VISIBILITY
+  explicit recursive_directory_iterator(
+      const path& __p, directory_options __xoptions = directory_options::none)
+      : recursive_directory_iterator(__p, __xoptions, nullptr) {}
+
+  _LIBCPP_INLINE_VISIBILITY
+  recursive_directory_iterator(const path& __p, directory_options __xoptions,
+                               error_code& __ec)
+      : recursive_directory_iterator(__p, __xoptions, &__ec) {}
+
+  _LIBCPP_INLINE_VISIBILITY
+  recursive_directory_iterator(const path& __p, error_code& __ec)
+      : recursive_directory_iterator(__p, directory_options::none, &__ec) {}
+
+  recursive_directory_iterator(const recursive_directory_iterator&) = default;
+  recursive_directory_iterator(recursive_directory_iterator&&) = default;
+
+  recursive_directory_iterator&
+  operator=(const recursive_directory_iterator&) = default;
+
+  _LIBCPP_INLINE_VISIBILITY
+  recursive_directory_iterator&
+  operator=(recursive_directory_iterator&& __o) noexcept {
+    // non-default implementation provided to support self-move assign.
+    if (this != &__o) {
+      __imp_ = _VSTD::move(__o.__imp_);
+      __rec_ = __o.__rec_;
+    }
+    return *this;
+  }
+
+  ~recursive_directory_iterator() = default;
+
+  _LIBCPP_INLINE_VISIBILITY
+  const directory_entry& operator*() const { return __dereference(); }
+
+  _LIBCPP_INLINE_VISIBILITY
+  const directory_entry* operator->() const { return &__dereference(); }
+
+  recursive_directory_iterator& operator++() { return __increment(); }
+
+  _LIBCPP_INLINE_VISIBILITY
+  __dir_element_proxy operator++(int) {
+    __dir_element_proxy __p(**this);
+    __increment();
+    return __p;
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  recursive_directory_iterator& increment(error_code& __ec) {
+    return __increment(&__ec);
+  }
+
+  _LIBCPP_FUNC_VIS directory_options options() const;
+  _LIBCPP_FUNC_VIS int depth() const;
+
+  _LIBCPP_INLINE_VISIBILITY
+  void pop() { __pop(); }
+
+  _LIBCPP_INLINE_VISIBILITY
+  void pop(error_code& __ec) { __pop(&__ec); }
+
+  _LIBCPP_INLINE_VISIBILITY
+  bool recursion_pending() const { return __rec_; }
+
+  _LIBCPP_INLINE_VISIBILITY
+  void disable_recursion_pending() { __rec_ = false; }
+
+private:
+  _LIBCPP_FUNC_VIS
+  recursive_directory_iterator(const path& __p, directory_options __opt,
+                               error_code* __ec);
+
+  _LIBCPP_FUNC_VIS
+  const directory_entry& __dereference() const;
+
+  _LIBCPP_FUNC_VIS
+  bool __try_recursion(error_code* __ec);
+
+  _LIBCPP_FUNC_VIS
+  void __advance(error_code* __ec = nullptr);
+
+  _LIBCPP_FUNC_VIS
+  recursive_directory_iterator& __increment(error_code* __ec = nullptr);
+
+  _LIBCPP_FUNC_VIS
+  void __pop(error_code* __ec = nullptr);
+
+  inline _LIBCPP_INLINE_VISIBILITY friend bool
+  operator==(const recursive_directory_iterator&,
+             const recursive_directory_iterator&) noexcept;
+
+  struct _LIBCPP_HIDDEN __shared_imp;
+  shared_ptr<__shared_imp> __imp_;
+  bool __rec_;
+}; // class recursive_directory_iterator
+
+inline _LIBCPP_INLINE_VISIBILITY bool
+operator==(const recursive_directory_iterator& __lhs,
+           const recursive_directory_iterator& __rhs) noexcept {
+  return __lhs.__imp_ == __rhs.__imp_;
+}
+
+_LIBCPP_INLINE_VISIBILITY
+inline bool operator!=(const recursive_directory_iterator& __lhs,
+                       const recursive_directory_iterator& __rhs) noexcept {
+  return !(__lhs == __rhs);
+}
+// enable recursive_directory_iterator range-based for statements
+inline _LIBCPP_INLINE_VISIBILITY recursive_directory_iterator
+begin(recursive_directory_iterator __iter) noexcept {
+  return __iter;
+}
+
+inline _LIBCPP_INLINE_VISIBILITY recursive_directory_iterator
+end(const recursive_directory_iterator&) noexcept {
+  return recursive_directory_iterator();
+}
+
+_LIBCPP_AVAILABILITY_FILESYSTEM_POP
+
+_LIBCPP_END_NAMESPACE_FILESYSTEM
+
+#endif // !_LIBCPP_CXX03_LANG
+
+#ifdef _LIBCPP_COMPILER_MSVC
+#pragma warning ( pop )
+#endif
+
+_LIBCPP_POP_MACROS
+
+#endif // _LIBCPP_FILESYSTEM