Restoring authorship annotation for Andrey Khalyavin <halyavin@gmail.com>. Commit 1 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 f503343f87..fbe4f51d04 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