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

1 files changed, 821 insertions, 821 deletions

diff --git a/contrib/libs/cxxsupp/libcxx/include/sstream b/contrib/libs/cxxsupp/libcxx/include/sstream
index 27d246688a..fbe5ffcab4 100644
--- a/contrib/libs/cxxsupp/libcxx/include/sstream
+++ b/contrib/libs/cxxsupp/libcxx/include/sstream
@@ -1,871 +1,871 @@
-// -*- C++ -*- 
-//===--------------------------- sstream ----------------------------------===// 
-// 
+// -*- C++ -*-
+//===--------------------------- sstream ----------------------------------===//
+//
 // 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_SSTREAM 
-#define _LIBCPP_SSTREAM 
- 
-/* 
-    sstream synopsis 
- 
-template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> > 
-class basic_stringbuf 
-    : public basic_streambuf<charT, traits> 
-{ 
-public: 
-    typedef charT                          char_type; 
-    typedef traits                         traits_type; 
-    typedef typename traits_type::int_type int_type; 
-    typedef typename traits_type::pos_type pos_type; 
-    typedef typename traits_type::off_type off_type; 
-    typedef Allocator                      allocator_type; 
- 
-    // 27.8.1.1 [stringbuf.cons], constructors: 
-    explicit basic_stringbuf(ios_base::openmode which = ios_base::in | ios_base::out); // before C++20 
-    basic_stringbuf() : basic_stringbuf(ios_base::in | ios_base::out) {}               // C++20 
-    explicit basic_stringbuf(ios_base::openmode which);                                // C++20 
-    explicit basic_stringbuf(const basic_string<char_type, traits_type, allocator_type>& str, 
-                             ios_base::openmode which = ios_base::in | ios_base::out); 
-    basic_stringbuf(basic_stringbuf&& rhs); 
- 
-    // 27.8.1.2 Assign and swap: 
-    basic_stringbuf& operator=(basic_stringbuf&& rhs); 
-    void swap(basic_stringbuf& rhs); 
- 
-    // 27.8.1.3 Get and set: 
-    basic_string<char_type, traits_type, allocator_type> str() const; 
-    void str(const basic_string<char_type, traits_type, allocator_type>& s); 
- 
-protected: 
-    // 27.8.1.4 Overridden virtual functions: 
-    virtual int_type underflow(); 
-    virtual int_type pbackfail(int_type c = traits_type::eof()); 
-    virtual int_type overflow (int_type c = traits_type::eof()); 
-    virtual basic_streambuf<char_type, traits_type>* setbuf(char_type*, streamsize); 
-    virtual pos_type seekoff(off_type off, ios_base::seekdir way, 
-                             ios_base::openmode which = ios_base::in | ios_base::out); 
-    virtual pos_type seekpos(pos_type sp, 
-                             ios_base::openmode which = ios_base::in | ios_base::out); 
-}; 
- 
-template <class charT, class traits, class Allocator> 
-  void swap(basic_stringbuf<charT, traits, Allocator>& x, 
-            basic_stringbuf<charT, traits, Allocator>& y); 
- 
-typedef basic_stringbuf<char>    stringbuf; 
-typedef basic_stringbuf<wchar_t> wstringbuf; 
- 
-template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> > 
-class basic_istringstream 
-    : public basic_istream<charT, traits> 
-{ 
-public: 
-    typedef charT                          char_type; 
-    typedef traits                         traits_type; 
-    typedef typename traits_type::int_type int_type; 
-    typedef typename traits_type::pos_type pos_type; 
-    typedef typename traits_type::off_type off_type; 
-    typedef Allocator                      allocator_type; 
- 
-    // 27.8.2.1 Constructors: 
-    explicit basic_istringstream(ios_base::openmode which = ios_base::in); // before C++20 
-    basic_istringstream() : basic_istringstream(ios_base::in) {}           // C++20 
-    explicit basic_istringstream(ios_base::openmode which);                // C++20 
- 
-    explicit basic_istringstream(const basic_string<char_type, traits_type,allocator_type>& str, 
-                                 ios_base::openmode which = ios_base::in); 
-    basic_istringstream(basic_istringstream&& rhs); 
- 
-    // 27.8.2.2 Assign and swap: 
-    basic_istringstream& operator=(basic_istringstream&& rhs); 
-    void swap(basic_istringstream& rhs); 
- 
-    // 27.8.2.3 Members: 
-    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const; 
-    basic_string<char_type, traits_type, allocator_type> str() const; 
-    void str(const basic_string<char_type, traits_type, allocator_type>& s); 
-}; 
- 
-template <class charT, class traits, class Allocator> 
-  void swap(basic_istringstream<charT, traits, Allocator>& x, 
-            basic_istringstream<charT, traits, Allocator>& y); 
- 
-typedef basic_istringstream<char>    istringstream; 
-typedef basic_istringstream<wchar_t> wistringstream; 
- 
-template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> > 
-class basic_ostringstream 
-    : public basic_ostream<charT, traits> 
-{ 
-public: 
-    // types: 
-    typedef charT                          char_type; 
-    typedef traits                         traits_type; 
-    typedef typename traits_type::int_type int_type; 
-    typedef typename traits_type::pos_type pos_type; 
-    typedef typename traits_type::off_type off_type; 
-    typedef Allocator                      allocator_type; 
- 
-    // 27.8.3.1 Constructors/destructor: 
-    explicit basic_ostringstream(ios_base::openmode which = ios_base::out); // before C++20 
-    basic_ostringstream() : basic_ostringstream(ios_base::out) {}           // C++20 
-    explicit basic_ostringstream(ios_base::openmode which);                 // C++20 
- 
-    explicit basic_ostringstream(const basic_string<char_type, traits_type, allocator_type>& str, 
-                                 ios_base::openmode which = ios_base::out); 
-    basic_ostringstream(basic_ostringstream&& rhs); 
- 
-    // 27.8.3.2 Assign/swap: 
-    basic_ostringstream& operator=(basic_ostringstream&& rhs); 
-    void swap(basic_ostringstream& rhs); 
- 
-    // 27.8.3.3 Members: 
-    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const; 
-    basic_string<char_type, traits_type, allocator_type> str() const; 
-    void str(const basic_string<char_type, traits_type, allocator_type>& s); 
-}; 
- 
-template <class charT, class traits, class Allocator> 
-  void swap(basic_ostringstream<charT, traits, Allocator>& x, 
-            basic_ostringstream<charT, traits, Allocator>& y); 
- 
-typedef basic_ostringstream<char>    ostringstream; 
-typedef basic_ostringstream<wchar_t> wostringstream; 
- 
-template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> > 
-class basic_stringstream 
-    : public basic_iostream<charT, traits> 
-{ 
-public: 
-    // types: 
-    typedef charT                          char_type; 
-    typedef traits                         traits_type; 
-    typedef typename traits_type::int_type int_type; 
-    typedef typename traits_type::pos_type pos_type; 
-    typedef typename traits_type::off_type off_type; 
-    typedef Allocator                      allocator_type; 
- 
-    // constructors/destructor 
-    explicit basic_stringstream(ios_base::openmode which = ios_base::out | ios_base::in); // before C++20 
-    basic_stringstream() : basic_stringstream(ios_base::out | ios_base::in) {}            // C++20 
-    explicit basic_stringstream(ios_base::openmode which);                                // C++20 
- 
-    explicit basic_stringstream(const basic_string<char_type, traits_type, allocator_type>& str, 
-                                ios_base::openmode which = ios_base::out|ios_base::in); 
-    basic_stringstream(basic_stringstream&& rhs); 
- 
-    // 27.8.5.1 Assign/swap: 
-    basic_stringstream& operator=(basic_stringstream&& rhs); 
-    void swap(basic_stringstream& rhs); 
- 
-    // Members: 
-    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const; 
-    basic_string<char_type, traits_type, allocator_type> str() const; 
-    void str(const basic_string<char_type, traits_type, allocator_type>& str); 
-}; 
- 
-template <class charT, class traits, class Allocator> 
-  void swap(basic_stringstream<charT, traits, Allocator>& x, 
-            basic_stringstream<charT, traits, Allocator>& y); 
- 
-typedef basic_stringstream<char>    stringstream; 
-typedef basic_stringstream<wchar_t> wstringstream; 
- 
-}  // std 
- 
-*/ 
- 
-#include <__config> 
-#include <istream> 
-#include <ostream> 
-#include <string> 
- 
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 
-#pragma GCC system_header 
-#endif 
- 
-_LIBCPP_PUSH_MACROS 
-#include <__undef_macros> 
- 
- 
-_LIBCPP_BEGIN_NAMESPACE_STD 
- 
-// basic_stringbuf 
- 
-template <class _CharT, class _Traits, class _Allocator> 
-class _LIBCPP_TEMPLATE_VIS basic_stringbuf 
-    : public basic_streambuf<_CharT, _Traits> 
-{ 
-public: 
-    typedef _CharT                         char_type; 
-    typedef _Traits                        traits_type; 
-    typedef typename traits_type::int_type int_type; 
-    typedef typename traits_type::pos_type pos_type; 
-    typedef typename traits_type::off_type off_type; 
-    typedef _Allocator                     allocator_type; 
- 
-    typedef basic_string<char_type, traits_type, allocator_type> string_type; 
- 
-private: 
- 
-    string_type __str_; 
-    mutable char_type* __hm_; 
-    ios_base::openmode __mode_; 
- 
-public: 
-    // 30.8.2.1 [stringbuf.cons], constructors 
-    _LIBCPP_INLINE_VISIBILITY 
-    basic_stringbuf() 
-        : __hm_(nullptr), __mode_(ios_base::in | ios_base::out) {} 
- 
-    _LIBCPP_INLINE_VISIBILITY 
-    explicit basic_stringbuf(ios_base::openmode __wch) 
-        : __hm_(nullptr), __mode_(__wch) {} 
- 
-    _LIBCPP_INLINE_VISIBILITY 
-    explicit basic_stringbuf(const string_type& __s, 
-                             ios_base::openmode __wch = ios_base::in | ios_base::out) 
-        : __str_(__s.get_allocator()), __hm_(nullptr), __mode_(__wch) 
-    { 
-        str(__s); 
-    } 
- 
-    basic_stringbuf(basic_stringbuf&& __rhs); 
- 
-    // 27.8.1.2 Assign and swap: 
-    basic_stringbuf& operator=(basic_stringbuf&& __rhs); 
-    void swap(basic_stringbuf& __rhs); 
- 
-    // 27.8.1.3 Get and set: 
-    string_type str() const; 
-    void str(const string_type& __s); 
- 
-protected: 
-    // 27.8.1.4 Overridden virtual functions: 
-    virtual int_type underflow(); 
-    virtual int_type pbackfail(int_type __c = traits_type::eof()); 
-    virtual int_type overflow (int_type __c = traits_type::eof()); 
-    virtual pos_type seekoff(off_type __off, ios_base::seekdir __way, 
-                             ios_base::openmode __wch = ios_base::in | ios_base::out); 
-    _LIBCPP_INLINE_VISIBILITY 
-    virtual pos_type seekpos(pos_type __sp, 
-                             ios_base::openmode __wch = ios_base::in | ios_base::out) { 
-        return seekoff(__sp, ios_base::beg, __wch); 
-    }
-}; 
- 
-template <class _CharT, class _Traits, class _Allocator> 
-basic_stringbuf<_CharT, _Traits, _Allocator>::basic_stringbuf(basic_stringbuf&& __rhs) 
-    : __mode_(__rhs.__mode_) 
-{ 
-    char_type* __p = const_cast<char_type*>(__rhs.__str_.data()); 
-    ptrdiff_t __binp = -1; 
-    ptrdiff_t __ninp = -1; 
-    ptrdiff_t __einp = -1; 
-    if (__rhs.eback() != nullptr) 
-    { 
-        __binp = __rhs.eback() - __p; 
-        __ninp = __rhs.gptr() - __p; 
-        __einp = __rhs.egptr() - __p; 
-    } 
-    ptrdiff_t __bout = -1; 
-    ptrdiff_t __nout = -1; 
-    ptrdiff_t __eout = -1; 
-    if (__rhs.pbase() != nullptr) 
-    { 
-        __bout = __rhs.pbase() - __p; 
-        __nout = __rhs.pptr() - __p; 
-        __eout = __rhs.epptr() - __p; 
-    } 
-    ptrdiff_t __hm = __rhs.__hm_ == nullptr ? -1 : __rhs.__hm_ - __p; 
-    __str_ = _VSTD::move(__rhs.__str_); 
-    __p = const_cast<char_type*>(__str_.data()); 
-    if (__binp != -1) 
-        this->setg(__p + __binp, __p + __ninp, __p + __einp); 
-    if (__bout != -1) 
-    { 
-        this->setp(__p + __bout, __p + __eout); 
-        this->__pbump(__nout); 
-    } 
-    __hm_ = __hm == -1 ? nullptr : __p + __hm; 
-    __p = const_cast<char_type*>(__rhs.__str_.data()); 
-    __rhs.setg(__p, __p, __p); 
-    __rhs.setp(__p, __p); 
-    __rhs.__hm_ = __p; 
-    this->pubimbue(__rhs.getloc()); 
-} 
- 
-template <class _CharT, class _Traits, class _Allocator> 
-basic_stringbuf<_CharT, _Traits, _Allocator>& 
-basic_stringbuf<_CharT, _Traits, _Allocator>::operator=(basic_stringbuf&& __rhs) 
-{ 
-    char_type* __p = const_cast<char_type*>(__rhs.__str_.data()); 
-    ptrdiff_t __binp = -1; 
-    ptrdiff_t __ninp = -1; 
-    ptrdiff_t __einp = -1; 
-    if (__rhs.eback() != nullptr) 
-    { 
-        __binp = __rhs.eback() - __p; 
-        __ninp = __rhs.gptr() - __p; 
-        __einp = __rhs.egptr() - __p; 
-    } 
-    ptrdiff_t __bout = -1; 
-    ptrdiff_t __nout = -1; 
-    ptrdiff_t __eout = -1; 
-    if (__rhs.pbase() != nullptr) 
-    { 
-        __bout = __rhs.pbase() - __p; 
-        __nout = __rhs.pptr() - __p; 
-        __eout = __rhs.epptr() - __p; 
-    } 
-    ptrdiff_t __hm = __rhs.__hm_ == nullptr ? -1 : __rhs.__hm_ - __p; 
-    __str_ = _VSTD::move(__rhs.__str_); 
-    __p = const_cast<char_type*>(__str_.data()); 
-    if (__binp != -1) 
-        this->setg(__p + __binp, __p + __ninp, __p + __einp); 
-    else 
-        this->setg(nullptr, nullptr, nullptr); 
-    if (__bout != -1) 
-    { 
-        this->setp(__p + __bout, __p + __eout); 
-        this->__pbump(__nout); 
-    } 
-    else 
-        this->setp(nullptr, nullptr); 
- 
-    __hm_ = __hm == -1 ? nullptr : __p + __hm; 
-    __mode_ = __rhs.__mode_; 
-    __p = const_cast<char_type*>(__rhs.__str_.data()); 
-    __rhs.setg(__p, __p, __p); 
-    __rhs.setp(__p, __p); 
-    __rhs.__hm_ = __p; 
-    this->pubimbue(__rhs.getloc()); 
-    return *this; 
-} 
- 
-template <class _CharT, class _Traits, class _Allocator> 
-void 
-basic_stringbuf<_CharT, _Traits, _Allocator>::swap(basic_stringbuf& __rhs) 
-{ 
-    char_type* __p = const_cast<char_type*>(__rhs.__str_.data()); 
-    ptrdiff_t __rbinp = -1; 
-    ptrdiff_t __rninp = -1; 
-    ptrdiff_t __reinp = -1; 
-    if (__rhs.eback() != nullptr) 
-    { 
-        __rbinp = __rhs.eback() - __p; 
-        __rninp = __rhs.gptr() - __p; 
-        __reinp = __rhs.egptr() - __p; 
-    } 
-    ptrdiff_t __rbout = -1; 
-    ptrdiff_t __rnout = -1; 
-    ptrdiff_t __reout = -1; 
-    if (__rhs.pbase() != nullptr) 
-    { 
-        __rbout = __rhs.pbase() - __p; 
-        __rnout = __rhs.pptr() - __p; 
-        __reout = __rhs.epptr() - __p; 
-    } 
-    ptrdiff_t __rhm = __rhs.__hm_ == nullptr ? -1 : __rhs.__hm_ - __p; 
-    __p = const_cast<char_type*>(__str_.data()); 
-    ptrdiff_t __lbinp = -1; 
-    ptrdiff_t __lninp = -1; 
-    ptrdiff_t __leinp = -1; 
-    if (this->eback() != nullptr) 
-    { 
-        __lbinp = this->eback() - __p; 
-        __lninp = this->gptr() - __p; 
-        __leinp = this->egptr() - __p; 
-    } 
-    ptrdiff_t __lbout = -1; 
-    ptrdiff_t __lnout = -1; 
-    ptrdiff_t __leout = -1; 
-    if (this->pbase() != nullptr) 
-    { 
-        __lbout = this->pbase() - __p; 
-        __lnout = this->pptr() - __p; 
-        __leout = this->epptr() - __p; 
-    } 
-    ptrdiff_t __lhm = __hm_ == nullptr ? -1 : __hm_ - __p; 
-    _VSTD::swap(__mode_, __rhs.__mode_); 
-    __str_.swap(__rhs.__str_); 
-    __p = const_cast<char_type*>(__str_.data()); 
-    if (__rbinp != -1) 
-        this->setg(__p + __rbinp, __p + __rninp, __p + __reinp); 
-    else 
-        this->setg(nullptr, nullptr, nullptr); 
-    if (__rbout != -1) 
-    { 
-        this->setp(__p + __rbout, __p + __reout); 
-        this->__pbump(__rnout); 
-    } 
-    else 
-        this->setp(nullptr, nullptr); 
-    __hm_ = __rhm == -1 ? nullptr : __p + __rhm; 
-    __p = const_cast<char_type*>(__rhs.__str_.data()); 
-    if (__lbinp != -1) 
-        __rhs.setg(__p + __lbinp, __p + __lninp, __p + __leinp); 
-    else 
-        __rhs.setg(nullptr, nullptr, nullptr); 
-    if (__lbout != -1) 
-    { 
-        __rhs.setp(__p + __lbout, __p + __leout); 
-        __rhs.__pbump(__lnout); 
-    } 
-    else 
-        __rhs.setp(nullptr, nullptr); 
-    __rhs.__hm_ = __lhm == -1 ? nullptr : __p + __lhm; 
-    locale __tl = __rhs.getloc(); 
-    __rhs.pubimbue(this->getloc()); 
-    this->pubimbue(__tl); 
-} 
- 
-template <class _CharT, class _Traits, class _Allocator> 
-inline _LIBCPP_INLINE_VISIBILITY 
-void 
-swap(basic_stringbuf<_CharT, _Traits, _Allocator>& __x, 
-     basic_stringbuf<_CharT, _Traits, _Allocator>& __y) 
-{ 
-    __x.swap(__y); 
-} 
- 
-template <class _CharT, class _Traits, class _Allocator> 
-basic_string<_CharT, _Traits, _Allocator> 
-basic_stringbuf<_CharT, _Traits, _Allocator>::str() const 
-{ 
-    if (__mode_ & ios_base::out) 
-    { 
-        if (__hm_ < this->pptr()) 
-            __hm_ = this->pptr(); 
-        return string_type(this->pbase(), __hm_, __str_.get_allocator()); 
-    } 
-    else if (__mode_ & ios_base::in) 
-        return string_type(this->eback(), this->egptr(), __str_.get_allocator()); 
-    return string_type(__str_.get_allocator()); 
-} 
- 
-template <class _CharT, class _Traits, class _Allocator> 
-void 
-basic_stringbuf<_CharT, _Traits, _Allocator>::str(const string_type& __s) 
-{ 
-    __str_ = __s; 
-    __hm_ = nullptr; 
-    if (__mode_ & ios_base::in) 
-    { 
-        __hm_ = const_cast<char_type*>(__str_.data()) + __str_.size(); 
-        this->setg(const_cast<char_type*>(__str_.data()), 
-                   const_cast<char_type*>(__str_.data()), 
-                   __hm_); 
-    } 
-    if (__mode_ & ios_base::out) 
-    { 
-        typename string_type::size_type __sz = __str_.size(); 
-        __hm_ = const_cast<char_type*>(__str_.data()) + __sz; 
-        __str_.resize(__str_.capacity()); 
-        this->setp(const_cast<char_type*>(__str_.data()), 
-                   const_cast<char_type*>(__str_.data()) + __str_.size()); 
-        if (__mode_ & (ios_base::app | ios_base::ate)) 
-        { 
-            while (__sz > INT_MAX) 
-            { 
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_SSTREAM
+#define _LIBCPP_SSTREAM
+
+/*
+    sstream synopsis
+
+template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
+class basic_stringbuf
+    : public basic_streambuf<charT, traits>
+{
+public:
+    typedef charT                          char_type;
+    typedef traits                         traits_type;
+    typedef typename traits_type::int_type int_type;
+    typedef typename traits_type::pos_type pos_type;
+    typedef typename traits_type::off_type off_type;
+    typedef Allocator                      allocator_type;
+
+    // 27.8.1.1 [stringbuf.cons], constructors:
+    explicit basic_stringbuf(ios_base::openmode which = ios_base::in | ios_base::out); // before C++20
+    basic_stringbuf() : basic_stringbuf(ios_base::in | ios_base::out) {}               // C++20
+    explicit basic_stringbuf(ios_base::openmode which);                                // C++20
+    explicit basic_stringbuf(const basic_string<char_type, traits_type, allocator_type>& str,
+                             ios_base::openmode which = ios_base::in | ios_base::out);
+    basic_stringbuf(basic_stringbuf&& rhs);
+
+    // 27.8.1.2 Assign and swap:
+    basic_stringbuf& operator=(basic_stringbuf&& rhs);
+    void swap(basic_stringbuf& rhs);
+
+    // 27.8.1.3 Get and set:
+    basic_string<char_type, traits_type, allocator_type> str() const;
+    void str(const basic_string<char_type, traits_type, allocator_type>& s);
+
+protected:
+    // 27.8.1.4 Overridden virtual functions:
+    virtual int_type underflow();
+    virtual int_type pbackfail(int_type c = traits_type::eof());
+    virtual int_type overflow (int_type c = traits_type::eof());
+    virtual basic_streambuf<char_type, traits_type>* setbuf(char_type*, streamsize);
+    virtual pos_type seekoff(off_type off, ios_base::seekdir way,
+                             ios_base::openmode which = ios_base::in | ios_base::out);
+    virtual pos_type seekpos(pos_type sp,
+                             ios_base::openmode which = ios_base::in | ios_base::out);
+};
+
+template <class charT, class traits, class Allocator>
+  void swap(basic_stringbuf<charT, traits, Allocator>& x,
+            basic_stringbuf<charT, traits, Allocator>& y);
+
+typedef basic_stringbuf<char>    stringbuf;
+typedef basic_stringbuf<wchar_t> wstringbuf;
+
+template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
+class basic_istringstream
+    : public basic_istream<charT, traits>
+{
+public:
+    typedef charT                          char_type;
+    typedef traits                         traits_type;
+    typedef typename traits_type::int_type int_type;
+    typedef typename traits_type::pos_type pos_type;
+    typedef typename traits_type::off_type off_type;
+    typedef Allocator                      allocator_type;
+
+    // 27.8.2.1 Constructors:
+    explicit basic_istringstream(ios_base::openmode which = ios_base::in); // before C++20
+    basic_istringstream() : basic_istringstream(ios_base::in) {}           // C++20
+    explicit basic_istringstream(ios_base::openmode which);                // C++20
+
+    explicit basic_istringstream(const basic_string<char_type, traits_type,allocator_type>& str,
+                                 ios_base::openmode which = ios_base::in);
+    basic_istringstream(basic_istringstream&& rhs);
+
+    // 27.8.2.2 Assign and swap:
+    basic_istringstream& operator=(basic_istringstream&& rhs);
+    void swap(basic_istringstream& rhs);
+
+    // 27.8.2.3 Members:
+    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const;
+    basic_string<char_type, traits_type, allocator_type> str() const;
+    void str(const basic_string<char_type, traits_type, allocator_type>& s);
+};
+
+template <class charT, class traits, class Allocator>
+  void swap(basic_istringstream<charT, traits, Allocator>& x,
+            basic_istringstream<charT, traits, Allocator>& y);
+
+typedef basic_istringstream<char>    istringstream;
+typedef basic_istringstream<wchar_t> wistringstream;
+
+template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
+class basic_ostringstream
+    : public basic_ostream<charT, traits>
+{
+public:
+    // types:
+    typedef charT                          char_type;
+    typedef traits                         traits_type;
+    typedef typename traits_type::int_type int_type;
+    typedef typename traits_type::pos_type pos_type;
+    typedef typename traits_type::off_type off_type;
+    typedef Allocator                      allocator_type;
+
+    // 27.8.3.1 Constructors/destructor:
+    explicit basic_ostringstream(ios_base::openmode which = ios_base::out); // before C++20
+    basic_ostringstream() : basic_ostringstream(ios_base::out) {}           // C++20
+    explicit basic_ostringstream(ios_base::openmode which);                 // C++20
+
+    explicit basic_ostringstream(const basic_string<char_type, traits_type, allocator_type>& str,
+                                 ios_base::openmode which = ios_base::out);
+    basic_ostringstream(basic_ostringstream&& rhs);
+
+    // 27.8.3.2 Assign/swap:
+    basic_ostringstream& operator=(basic_ostringstream&& rhs);
+    void swap(basic_ostringstream& rhs);
+
+    // 27.8.3.3 Members:
+    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const;
+    basic_string<char_type, traits_type, allocator_type> str() const;
+    void str(const basic_string<char_type, traits_type, allocator_type>& s);
+};
+
+template <class charT, class traits, class Allocator>
+  void swap(basic_ostringstream<charT, traits, Allocator>& x,
+            basic_ostringstream<charT, traits, Allocator>& y);
+
+typedef basic_ostringstream<char>    ostringstream;
+typedef basic_ostringstream<wchar_t> wostringstream;
+
+template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
+class basic_stringstream
+    : public basic_iostream<charT, traits>
+{
+public:
+    // types:
+    typedef charT                          char_type;
+    typedef traits                         traits_type;
+    typedef typename traits_type::int_type int_type;
+    typedef typename traits_type::pos_type pos_type;
+    typedef typename traits_type::off_type off_type;
+    typedef Allocator                      allocator_type;
+
+    // constructors/destructor
+    explicit basic_stringstream(ios_base::openmode which = ios_base::out | ios_base::in); // before C++20
+    basic_stringstream() : basic_stringstream(ios_base::out | ios_base::in) {}            // C++20
+    explicit basic_stringstream(ios_base::openmode which);                                // C++20
+
+    explicit basic_stringstream(const basic_string<char_type, traits_type, allocator_type>& str,
+                                ios_base::openmode which = ios_base::out|ios_base::in);
+    basic_stringstream(basic_stringstream&& rhs);
+
+    // 27.8.5.1 Assign/swap:
+    basic_stringstream& operator=(basic_stringstream&& rhs);
+    void swap(basic_stringstream& rhs);
+
+    // Members:
+    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const;
+    basic_string<char_type, traits_type, allocator_type> str() const;
+    void str(const basic_string<char_type, traits_type, allocator_type>& str);
+};
+
+template <class charT, class traits, class Allocator>
+  void swap(basic_stringstream<charT, traits, Allocator>& x,
+            basic_stringstream<charT, traits, Allocator>& y);
+
+typedef basic_stringstream<char>    stringstream;
+typedef basic_stringstream<wchar_t> wstringstream;
+
+}  // std
+
+*/
+
+#include <__config>
+#include <istream>
+#include <ostream>
+#include <string>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+// basic_stringbuf
+
+template <class _CharT, class _Traits, class _Allocator>
+class _LIBCPP_TEMPLATE_VIS basic_stringbuf
+    : public basic_streambuf<_CharT, _Traits>
+{
+public:
+    typedef _CharT                         char_type;
+    typedef _Traits                        traits_type;
+    typedef typename traits_type::int_type int_type;
+    typedef typename traits_type::pos_type pos_type;
+    typedef typename traits_type::off_type off_type;
+    typedef _Allocator                     allocator_type;
+
+    typedef basic_string<char_type, traits_type, allocator_type> string_type;
+
+private:
+
+    string_type __str_;
+    mutable char_type* __hm_;
+    ios_base::openmode __mode_;
+
+public:
+    // 30.8.2.1 [stringbuf.cons], constructors
+    _LIBCPP_INLINE_VISIBILITY
+    basic_stringbuf()
+        : __hm_(nullptr), __mode_(ios_base::in | ios_base::out) {}
+
+    _LIBCPP_INLINE_VISIBILITY
+    explicit basic_stringbuf(ios_base::openmode __wch)
+        : __hm_(nullptr), __mode_(__wch) {}
+
+    _LIBCPP_INLINE_VISIBILITY
+    explicit basic_stringbuf(const string_type& __s,
+                             ios_base::openmode __wch = ios_base::in | ios_base::out)
+        : __str_(__s.get_allocator()), __hm_(nullptr), __mode_(__wch)
+    {
+        str(__s);
+    }
+
+    basic_stringbuf(basic_stringbuf&& __rhs);
+
+    // 27.8.1.2 Assign and swap:
+    basic_stringbuf& operator=(basic_stringbuf&& __rhs);
+    void swap(basic_stringbuf& __rhs);
+
+    // 27.8.1.3 Get and set:
+    string_type str() const;
+    void str(const string_type& __s);
+
+protected:
+    // 27.8.1.4 Overridden virtual functions:
+    virtual int_type underflow();
+    virtual int_type pbackfail(int_type __c = traits_type::eof());
+    virtual int_type overflow (int_type __c = traits_type::eof());
+    virtual pos_type seekoff(off_type __off, ios_base::seekdir __way,
+                             ios_base::openmode __wch = ios_base::in | ios_base::out);
+    _LIBCPP_INLINE_VISIBILITY
+    virtual pos_type seekpos(pos_type __sp,
+                             ios_base::openmode __wch = ios_base::in | ios_base::out) {
+        return seekoff(__sp, ios_base::beg, __wch);
+    }
+};
+
+template <class _CharT, class _Traits, class _Allocator>
+basic_stringbuf<_CharT, _Traits, _Allocator>::basic_stringbuf(basic_stringbuf&& __rhs)
+    : __mode_(__rhs.__mode_)
+{
+    char_type* __p = const_cast<char_type*>(__rhs.__str_.data());
+    ptrdiff_t __binp = -1;
+    ptrdiff_t __ninp = -1;
+    ptrdiff_t __einp = -1;
+    if (__rhs.eback() != nullptr)
+    {
+        __binp = __rhs.eback() - __p;
+        __ninp = __rhs.gptr() - __p;
+        __einp = __rhs.egptr() - __p;
+    }
+    ptrdiff_t __bout = -1;
+    ptrdiff_t __nout = -1;
+    ptrdiff_t __eout = -1;
+    if (__rhs.pbase() != nullptr)
+    {
+        __bout = __rhs.pbase() - __p;
+        __nout = __rhs.pptr() - __p;
+        __eout = __rhs.epptr() - __p;
+    }
+    ptrdiff_t __hm = __rhs.__hm_ == nullptr ? -1 : __rhs.__hm_ - __p;
+    __str_ = _VSTD::move(__rhs.__str_);
+    __p = const_cast<char_type*>(__str_.data());
+    if (__binp != -1)
+        this->setg(__p + __binp, __p + __ninp, __p + __einp);
+    if (__bout != -1)
+    {
+        this->setp(__p + __bout, __p + __eout);
+        this->__pbump(__nout);
+    }
+    __hm_ = __hm == -1 ? nullptr : __p + __hm;
+    __p = const_cast<char_type*>(__rhs.__str_.data());
+    __rhs.setg(__p, __p, __p);
+    __rhs.setp(__p, __p);
+    __rhs.__hm_ = __p;
+    this->pubimbue(__rhs.getloc());
+}
+
+template <class _CharT, class _Traits, class _Allocator>
+basic_stringbuf<_CharT, _Traits, _Allocator>&
+basic_stringbuf<_CharT, _Traits, _Allocator>::operator=(basic_stringbuf&& __rhs)
+{
+    char_type* __p = const_cast<char_type*>(__rhs.__str_.data());
+    ptrdiff_t __binp = -1;
+    ptrdiff_t __ninp = -1;
+    ptrdiff_t __einp = -1;
+    if (__rhs.eback() != nullptr)
+    {
+        __binp = __rhs.eback() - __p;
+        __ninp = __rhs.gptr() - __p;
+        __einp = __rhs.egptr() - __p;
+    }
+    ptrdiff_t __bout = -1;
+    ptrdiff_t __nout = -1;
+    ptrdiff_t __eout = -1;
+    if (__rhs.pbase() != nullptr)
+    {
+        __bout = __rhs.pbase() - __p;
+        __nout = __rhs.pptr() - __p;
+        __eout = __rhs.epptr() - __p;
+    }
+    ptrdiff_t __hm = __rhs.__hm_ == nullptr ? -1 : __rhs.__hm_ - __p;
+    __str_ = _VSTD::move(__rhs.__str_);
+    __p = const_cast<char_type*>(__str_.data());
+    if (__binp != -1)
+        this->setg(__p + __binp, __p + __ninp, __p + __einp);
+    else
+        this->setg(nullptr, nullptr, nullptr);
+    if (__bout != -1)
+    {
+        this->setp(__p + __bout, __p + __eout);
+        this->__pbump(__nout);
+    }
+    else
+        this->setp(nullptr, nullptr);
+
+    __hm_ = __hm == -1 ? nullptr : __p + __hm;
+    __mode_ = __rhs.__mode_;
+    __p = const_cast<char_type*>(__rhs.__str_.data());
+    __rhs.setg(__p, __p, __p);
+    __rhs.setp(__p, __p);
+    __rhs.__hm_ = __p;
+    this->pubimbue(__rhs.getloc());
+    return *this;
+}
+
+template <class _CharT, class _Traits, class _Allocator>
+void
+basic_stringbuf<_CharT, _Traits, _Allocator>::swap(basic_stringbuf& __rhs)
+{
+    char_type* __p = const_cast<char_type*>(__rhs.__str_.data());
+    ptrdiff_t __rbinp = -1;
+    ptrdiff_t __rninp = -1;
+    ptrdiff_t __reinp = -1;
+    if (__rhs.eback() != nullptr)
+    {
+        __rbinp = __rhs.eback() - __p;
+        __rninp = __rhs.gptr() - __p;
+        __reinp = __rhs.egptr() - __p;
+    }
+    ptrdiff_t __rbout = -1;
+    ptrdiff_t __rnout = -1;
+    ptrdiff_t __reout = -1;
+    if (__rhs.pbase() != nullptr)
+    {
+        __rbout = __rhs.pbase() - __p;
+        __rnout = __rhs.pptr() - __p;
+        __reout = __rhs.epptr() - __p;
+    }
+    ptrdiff_t __rhm = __rhs.__hm_ == nullptr ? -1 : __rhs.__hm_ - __p;
+    __p = const_cast<char_type*>(__str_.data());
+    ptrdiff_t __lbinp = -1;
+    ptrdiff_t __lninp = -1;
+    ptrdiff_t __leinp = -1;
+    if (this->eback() != nullptr)
+    {
+        __lbinp = this->eback() - __p;
+        __lninp = this->gptr() - __p;
+        __leinp = this->egptr() - __p;
+    }
+    ptrdiff_t __lbout = -1;
+    ptrdiff_t __lnout = -1;
+    ptrdiff_t __leout = -1;
+    if (this->pbase() != nullptr)
+    {
+        __lbout = this->pbase() - __p;
+        __lnout = this->pptr() - __p;
+        __leout = this->epptr() - __p;
+    }
+    ptrdiff_t __lhm = __hm_ == nullptr ? -1 : __hm_ - __p;
+    _VSTD::swap(__mode_, __rhs.__mode_);
+    __str_.swap(__rhs.__str_);
+    __p = const_cast<char_type*>(__str_.data());
+    if (__rbinp != -1)
+        this->setg(__p + __rbinp, __p + __rninp, __p + __reinp);
+    else
+        this->setg(nullptr, nullptr, nullptr);
+    if (__rbout != -1)
+    {
+        this->setp(__p + __rbout, __p + __reout);
+        this->__pbump(__rnout);
+    }
+    else
+        this->setp(nullptr, nullptr);
+    __hm_ = __rhm == -1 ? nullptr : __p + __rhm;
+    __p = const_cast<char_type*>(__rhs.__str_.data());
+    if (__lbinp != -1)
+        __rhs.setg(__p + __lbinp, __p + __lninp, __p + __leinp);
+    else
+        __rhs.setg(nullptr, nullptr, nullptr);
+    if (__lbout != -1)
+    {
+        __rhs.setp(__p + __lbout, __p + __leout);
+        __rhs.__pbump(__lnout);
+    }
+    else
+        __rhs.setp(nullptr, nullptr);
+    __rhs.__hm_ = __lhm == -1 ? nullptr : __p + __lhm;
+    locale __tl = __rhs.getloc();
+    __rhs.pubimbue(this->getloc());
+    this->pubimbue(__tl);
+}
+
+template <class _CharT, class _Traits, class _Allocator>
+inline _LIBCPP_INLINE_VISIBILITY
+void
+swap(basic_stringbuf<_CharT, _Traits, _Allocator>& __x,
+     basic_stringbuf<_CharT, _Traits, _Allocator>& __y)
+{
+    __x.swap(__y);
+}
+
+template <class _CharT, class _Traits, class _Allocator>
+basic_string<_CharT, _Traits, _Allocator>
+basic_stringbuf<_CharT, _Traits, _Allocator>::str() const
+{
+    if (__mode_ & ios_base::out)
+    {
+        if (__hm_ < this->pptr())
+            __hm_ = this->pptr();
+        return string_type(this->pbase(), __hm_, __str_.get_allocator());
+    }
+    else if (__mode_ & ios_base::in)
+        return string_type(this->eback(), this->egptr(), __str_.get_allocator());
+    return string_type(__str_.get_allocator());
+}
+
+template <class _CharT, class _Traits, class _Allocator>
+void
+basic_stringbuf<_CharT, _Traits, _Allocator>::str(const string_type& __s)
+{
+    __str_ = __s;
+    __hm_ = nullptr;
+    if (__mode_ & ios_base::in)
+    {
+        __hm_ = const_cast<char_type*>(__str_.data()) + __str_.size();
+        this->setg(const_cast<char_type*>(__str_.data()),
+                   const_cast<char_type*>(__str_.data()),
+                   __hm_);
+    }
+    if (__mode_ & ios_base::out)
+    {
+        typename string_type::size_type __sz = __str_.size();
+        __hm_ = const_cast<char_type*>(__str_.data()) + __sz;
+        __str_.resize(__str_.capacity());
+        this->setp(const_cast<char_type*>(__str_.data()),
+                   const_cast<char_type*>(__str_.data()) + __str_.size());
+        if (__mode_ & (ios_base::app | ios_base::ate))
+        {
+            while (__sz > INT_MAX)
+            {
                 this->pbump(INT_MAX);
                 __sz -= INT_MAX;
-            } 
-            if (__sz > 0) 
+            }
+            if (__sz > 0)
                 this->pbump(__sz);
         }
-    } 
-} 
- 
-template <class _CharT, class _Traits, class _Allocator> 
-typename basic_stringbuf<_CharT, _Traits, _Allocator>::int_type 
-basic_stringbuf<_CharT, _Traits, _Allocator>::underflow() 
-{ 
-    if (__hm_ < this->pptr()) 
-        __hm_ = this->pptr(); 
-    if (__mode_ & ios_base::in) 
-    { 
-        if (this->egptr() < __hm_) 
-            this->setg(this->eback(), this->gptr(), __hm_); 
-        if (this->gptr() < this->egptr()) 
-            return traits_type::to_int_type(*this->gptr()); 
-    } 
-    return traits_type::eof(); 
-} 
- 
-template <class _CharT, class _Traits, class _Allocator> 
-typename basic_stringbuf<_CharT, _Traits, _Allocator>::int_type 
-basic_stringbuf<_CharT, _Traits, _Allocator>::pbackfail(int_type __c) 
-{ 
-    if (__hm_ < this->pptr()) 
-        __hm_ = this->pptr(); 
-    if (this->eback() < this->gptr()) 
-    { 
-        if (traits_type::eq_int_type(__c, traits_type::eof())) 
-        { 
-            this->setg(this->eback(), this->gptr()-1, __hm_); 
-            return traits_type::not_eof(__c); 
-        } 
-        if ((__mode_ & ios_base::out) || 
-            traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1])) 
-        { 
-            this->setg(this->eback(), this->gptr()-1, __hm_); 
-            *this->gptr() = traits_type::to_char_type(__c); 
-            return __c; 
-        } 
-    } 
-    return traits_type::eof(); 
-} 
- 
-template <class _CharT, class _Traits, class _Allocator> 
-typename basic_stringbuf<_CharT, _Traits, _Allocator>::int_type 
-basic_stringbuf<_CharT, _Traits, _Allocator>::overflow(int_type __c) 
-{ 
-    if (!traits_type::eq_int_type(__c, traits_type::eof())) 
-    { 
-        ptrdiff_t __ninp = this->gptr()  - this->eback(); 
-        if (this->pptr() == this->epptr()) 
-        { 
-            if (!(__mode_ & ios_base::out)) 
-                return traits_type::eof(); 
-#ifndef _LIBCPP_NO_EXCEPTIONS 
-            try 
-            { 
-#endif // _LIBCPP_NO_EXCEPTIONS 
-                ptrdiff_t __nout = this->pptr()  - this->pbase(); 
-                ptrdiff_t __hm = __hm_ - this->pbase(); 
-                __str_.push_back(char_type()); 
-                __str_.resize(__str_.capacity()); 
-                char_type* __p = const_cast<char_type*>(__str_.data()); 
-                this->setp(__p, __p + __str_.size()); 
-                this->__pbump(__nout); 
-                __hm_ = this->pbase() + __hm; 
-#ifndef _LIBCPP_NO_EXCEPTIONS 
-            } 
-            catch (...) 
-            { 
-                return traits_type::eof(); 
-            } 
-#endif // _LIBCPP_NO_EXCEPTIONS 
-        } 
-        __hm_ = _VSTD::max(this->pptr() + 1, __hm_); 
-        if (__mode_ & ios_base::in) 
-        { 
-            char_type* __p = const_cast<char_type*>(__str_.data()); 
-            this->setg(__p, __p + __ninp, __hm_); 
-        } 
+    }
+}
+
+template <class _CharT, class _Traits, class _Allocator>
+typename basic_stringbuf<_CharT, _Traits, _Allocator>::int_type
+basic_stringbuf<_CharT, _Traits, _Allocator>::underflow()
+{
+    if (__hm_ < this->pptr())
+        __hm_ = this->pptr();
+    if (__mode_ & ios_base::in)
+    {
+        if (this->egptr() < __hm_)
+            this->setg(this->eback(), this->gptr(), __hm_);
+        if (this->gptr() < this->egptr())
+            return traits_type::to_int_type(*this->gptr());
+    }
+    return traits_type::eof();
+}
+
+template <class _CharT, class _Traits, class _Allocator>
+typename basic_stringbuf<_CharT, _Traits, _Allocator>::int_type
+basic_stringbuf<_CharT, _Traits, _Allocator>::pbackfail(int_type __c)
+{
+    if (__hm_ < this->pptr())
+        __hm_ = this->pptr();
+    if (this->eback() < this->gptr())
+    {
+        if (traits_type::eq_int_type(__c, traits_type::eof()))
+        {
+            this->setg(this->eback(), this->gptr()-1, __hm_);
+            return traits_type::not_eof(__c);
+        }
+        if ((__mode_ & ios_base::out) ||
+            traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1]))
+        {
+            this->setg(this->eback(), this->gptr()-1, __hm_);
+            *this->gptr() = traits_type::to_char_type(__c);
+            return __c;
+        }
+    }
+    return traits_type::eof();
+}
+
+template <class _CharT, class _Traits, class _Allocator>
+typename basic_stringbuf<_CharT, _Traits, _Allocator>::int_type
+basic_stringbuf<_CharT, _Traits, _Allocator>::overflow(int_type __c)
+{
+    if (!traits_type::eq_int_type(__c, traits_type::eof()))
+    {
+        ptrdiff_t __ninp = this->gptr()  - this->eback();
+        if (this->pptr() == this->epptr())
+        {
+            if (!(__mode_ & ios_base::out))
+                return traits_type::eof();
+#ifndef _LIBCPP_NO_EXCEPTIONS
+            try
+            {
+#endif // _LIBCPP_NO_EXCEPTIONS
+                ptrdiff_t __nout = this->pptr()  - this->pbase();
+                ptrdiff_t __hm = __hm_ - this->pbase();
+                __str_.push_back(char_type());
+                __str_.resize(__str_.capacity());
+                char_type* __p = const_cast<char_type*>(__str_.data());
+                this->setp(__p, __p + __str_.size());
+                this->__pbump(__nout);
+                __hm_ = this->pbase() + __hm;
+#ifndef _LIBCPP_NO_EXCEPTIONS
+            }
+            catch (...)
+            {
+                return traits_type::eof();
+            }
+#endif // _LIBCPP_NO_EXCEPTIONS
+        }
+        __hm_ = _VSTD::max(this->pptr() + 1, __hm_);
+        if (__mode_ & ios_base::in)
+        {
+            char_type* __p = const_cast<char_type*>(__str_.data());
+            this->setg(__p, __p + __ninp, __hm_);
+        }
         return this->sputc(traits_type::to_char_type(__c));
-    } 
-    return traits_type::not_eof(__c); 
-} 
- 
-template <class _CharT, class _Traits, class _Allocator> 
-typename basic_stringbuf<_CharT, _Traits, _Allocator>::pos_type 
-basic_stringbuf<_CharT, _Traits, _Allocator>::seekoff(off_type __off, 
-                                                      ios_base::seekdir __way, 
-                                                      ios_base::openmode __wch) 
-{ 
-    if (__hm_ < this->pptr()) 
-        __hm_ = this->pptr(); 
-    if ((__wch & (ios_base::in | ios_base::out)) == 0) 
-        return pos_type(-1); 
-    if ((__wch & (ios_base::in | ios_base::out)) == (ios_base::in | ios_base::out) 
-        && __way == ios_base::cur) 
-        return pos_type(-1); 
-    const ptrdiff_t __hm = __hm_ == nullptr ? 0 : __hm_ - __str_.data(); 
-    off_type __noff; 
-    switch (__way) 
-    { 
-    case ios_base::beg: 
-        __noff = 0; 
-        break; 
-    case ios_base::cur: 
-        if (__wch & ios_base::in) 
-            __noff = this->gptr() - this->eback(); 
-        else 
-            __noff = this->pptr() - this->pbase(); 
-        break; 
-    case ios_base::end: 
-        __noff = __hm; 
-        break; 
-    default: 
-        return pos_type(-1); 
-    } 
-    __noff += __off; 
-    if (__noff < 0 || __hm < __noff) 
-        return pos_type(-1); 
-    if (__noff != 0) 
-    { 
-        if ((__wch & ios_base::in) && this->gptr() == nullptr) 
-            return pos_type(-1); 
-        if ((__wch & ios_base::out) && this->pptr() == nullptr) 
-            return pos_type(-1); 
-    } 
-    if (__wch & ios_base::in) 
-        this->setg(this->eback(), this->eback() + __noff, __hm_); 
-    if (__wch & ios_base::out) 
-    { 
-        this->setp(this->pbase(), this->epptr()); 
-        this->pbump(__noff); 
-    } 
-    return pos_type(__noff); 
-} 
- 
-// basic_istringstream 
- 
-template <class _CharT, class _Traits, class _Allocator> 
-class _LIBCPP_TEMPLATE_VIS basic_istringstream 
-    : public basic_istream<_CharT, _Traits> 
-{ 
-public: 
-    typedef _CharT                         char_type; 
-    typedef _Traits                        traits_type; 
-    typedef typename traits_type::int_type int_type; 
-    typedef typename traits_type::pos_type pos_type; 
-    typedef typename traits_type::off_type off_type; 
-    typedef _Allocator                     allocator_type; 
- 
-    typedef basic_string<char_type, traits_type, allocator_type> string_type; 
- 
-private: 
-    basic_stringbuf<char_type, traits_type, allocator_type> __sb_; 
- 
-public: 
-    // 30.8.3.1 [istringstream.cons], constructors 
-    _LIBCPP_INLINE_VISIBILITY 
-    basic_istringstream() 
-        : basic_istream<_CharT, _Traits>(&__sb_), __sb_(ios_base::in) {} 
- 
-    _LIBCPP_INLINE_VISIBILITY 
-    explicit basic_istringstream(ios_base::openmode __wch) 
-        : basic_istream<_CharT, _Traits>(&__sb_), __sb_(__wch | ios_base::in) {} 
- 
-    _LIBCPP_INLINE_VISIBILITY 
-    explicit basic_istringstream(const string_type& __s, 
-                                 ios_base::openmode __wch = ios_base::in) 
-        : basic_istream<_CharT, _Traits>(&__sb_) 
-        , __sb_(__s, __wch | ios_base::in) 
-    { } 
- 
-    _LIBCPP_INLINE_VISIBILITY 
-    basic_istringstream(basic_istringstream&& __rhs) 
-        : basic_istream<_CharT, _Traits>(_VSTD::move(__rhs)) 
-        , __sb_(_VSTD::move(__rhs.__sb_)) 
+    }
+    return traits_type::not_eof(__c);
+}
+
+template <class _CharT, class _Traits, class _Allocator>
+typename basic_stringbuf<_CharT, _Traits, _Allocator>::pos_type
+basic_stringbuf<_CharT, _Traits, _Allocator>::seekoff(off_type __off,
+                                                      ios_base::seekdir __way,
+                                                      ios_base::openmode __wch)
+{
+    if (__hm_ < this->pptr())
+        __hm_ = this->pptr();
+    if ((__wch & (ios_base::in | ios_base::out)) == 0)
+        return pos_type(-1);
+    if ((__wch & (ios_base::in | ios_base::out)) == (ios_base::in | ios_base::out)
+        && __way == ios_base::cur)
+        return pos_type(-1);
+    const ptrdiff_t __hm = __hm_ == nullptr ? 0 : __hm_ - __str_.data();
+    off_type __noff;
+    switch (__way)
+    {
+    case ios_base::beg:
+        __noff = 0;
+        break;
+    case ios_base::cur:
+        if (__wch & ios_base::in)
+            __noff = this->gptr() - this->eback();
+        else
+            __noff = this->pptr() - this->pbase();
+        break;
+    case ios_base::end:
+        __noff = __hm;
+        break;
+    default:
+        return pos_type(-1);
+    }
+    __noff += __off;
+    if (__noff < 0 || __hm < __noff)
+        return pos_type(-1);
+    if (__noff != 0)
+    {
+        if ((__wch & ios_base::in) && this->gptr() == nullptr)
+            return pos_type(-1);
+        if ((__wch & ios_base::out) && this->pptr() == nullptr)
+            return pos_type(-1);
+    }
+    if (__wch & ios_base::in)
+        this->setg(this->eback(), this->eback() + __noff, __hm_);
+    if (__wch & ios_base::out)
+    {
+        this->setp(this->pbase(), this->epptr());
+        this->pbump(__noff);
+    }
+    return pos_type(__noff);
+}
+
+// basic_istringstream
+
+template <class _CharT, class _Traits, class _Allocator>
+class _LIBCPP_TEMPLATE_VIS basic_istringstream
+    : public basic_istream<_CharT, _Traits>
+{
+public:
+    typedef _CharT                         char_type;
+    typedef _Traits                        traits_type;
+    typedef typename traits_type::int_type int_type;
+    typedef typename traits_type::pos_type pos_type;
+    typedef typename traits_type::off_type off_type;
+    typedef _Allocator                     allocator_type;
+
+    typedef basic_string<char_type, traits_type, allocator_type> string_type;
+
+private:
+    basic_stringbuf<char_type, traits_type, allocator_type> __sb_;
+
+public:
+    // 30.8.3.1 [istringstream.cons], constructors
+    _LIBCPP_INLINE_VISIBILITY
+    basic_istringstream()
+        : basic_istream<_CharT, _Traits>(&__sb_), __sb_(ios_base::in) {}
+
+    _LIBCPP_INLINE_VISIBILITY
+    explicit basic_istringstream(ios_base::openmode __wch)
+        : basic_istream<_CharT, _Traits>(&__sb_), __sb_(__wch | ios_base::in) {}
+
+    _LIBCPP_INLINE_VISIBILITY
+    explicit basic_istringstream(const string_type& __s,
+                                 ios_base::openmode __wch = ios_base::in)
+        : basic_istream<_CharT, _Traits>(&__sb_)
+        , __sb_(__s, __wch | ios_base::in)
+    { }
+
+    _LIBCPP_INLINE_VISIBILITY
+    basic_istringstream(basic_istringstream&& __rhs)
+        : basic_istream<_CharT, _Traits>(_VSTD::move(__rhs))
+        , __sb_(_VSTD::move(__rhs.__sb_))
     {
         basic_istream<_CharT, _Traits>::set_rdbuf(&__sb_);
     }
- 
-    // 27.8.2.2 Assign and swap: 
-    basic_istringstream& operator=(basic_istringstream&& __rhs) { 
+
+    // 27.8.2.2 Assign and swap:
+    basic_istringstream& operator=(basic_istringstream&& __rhs) {
         basic_istream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
         __sb_ = _VSTD::move(__rhs.__sb_);
         return *this;
     }
-    _LIBCPP_INLINE_VISIBILITY 
-    void swap(basic_istringstream& __rhs) { 
+    _LIBCPP_INLINE_VISIBILITY
+    void swap(basic_istringstream& __rhs) {
         basic_istream<char_type, traits_type>::swap(__rhs);
         __sb_.swap(__rhs.__sb_);
     }
- 
-    // 27.8.2.3 Members: 
-    _LIBCPP_INLINE_VISIBILITY 
-    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const { 
+
+    // 27.8.2.3 Members:
+    _LIBCPP_INLINE_VISIBILITY
+    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const {
         return const_cast<basic_stringbuf<char_type, traits_type, allocator_type>*>(&__sb_);
     }
-    _LIBCPP_INLINE_VISIBILITY 
-    string_type str() const { 
+    _LIBCPP_INLINE_VISIBILITY
+    string_type str() const {
         return __sb_.str();
     }
-    _LIBCPP_INLINE_VISIBILITY 
-    void str(const string_type& __s) { 
-        __sb_.str(__s); 
-    } 
-}; 
- 
-template <class _CharT, class _Traits, class _Allocator> 
-inline _LIBCPP_INLINE_VISIBILITY 
-void 
-swap(basic_istringstream<_CharT, _Traits, _Allocator>& __x, 
-     basic_istringstream<_CharT, _Traits, _Allocator>& __y) 
-{ 
-    __x.swap(__y); 
-} 
- 
-// basic_ostringstream 
- 
-template <class _CharT, class _Traits, class _Allocator> 
-class _LIBCPP_TEMPLATE_VIS basic_ostringstream 
-    : public basic_ostream<_CharT, _Traits> 
-{ 
-public: 
-    typedef _CharT                         char_type; 
-    typedef _Traits                        traits_type; 
-    typedef typename traits_type::int_type int_type; 
-    typedef typename traits_type::pos_type pos_type; 
-    typedef typename traits_type::off_type off_type; 
-    typedef _Allocator                     allocator_type; 
- 
-    typedef basic_string<char_type, traits_type, allocator_type> string_type; 
- 
-private: 
-    basic_stringbuf<char_type, traits_type, allocator_type> __sb_; 
- 
-public: 
-    // 30.8.4.1 [ostringstream.cons], constructors 
-    _LIBCPP_INLINE_VISIBILITY 
-    basic_ostringstream() 
-        : basic_ostream<_CharT, _Traits>(&__sb_), __sb_(ios_base::out) {} 
- 
-    _LIBCPP_INLINE_VISIBILITY 
-    explicit basic_ostringstream(ios_base::openmode __wch) 
-        : basic_ostream<_CharT, _Traits>(&__sb_), __sb_(__wch | ios_base::out) {} 
- 
-    _LIBCPP_INLINE_VISIBILITY 
-    explicit basic_ostringstream(const string_type& __s, 
-                                 ios_base::openmode __wch = ios_base::out) 
-        : basic_ostream<_CharT, _Traits>(&__sb_) 
-        , __sb_(__s, __wch | ios_base::out) 
-    { } 
- 
-    _LIBCPP_INLINE_VISIBILITY 
-    basic_ostringstream(basic_ostringstream&& __rhs) 
-        : basic_ostream<_CharT, _Traits>(_VSTD::move(__rhs)) 
-        , __sb_(_VSTD::move(__rhs.__sb_)) 
+    _LIBCPP_INLINE_VISIBILITY
+    void str(const string_type& __s) {
+        __sb_.str(__s);
+    }
+};
+
+template <class _CharT, class _Traits, class _Allocator>
+inline _LIBCPP_INLINE_VISIBILITY
+void
+swap(basic_istringstream<_CharT, _Traits, _Allocator>& __x,
+     basic_istringstream<_CharT, _Traits, _Allocator>& __y)
+{
+    __x.swap(__y);
+}
+
+// basic_ostringstream
+
+template <class _CharT, class _Traits, class _Allocator>
+class _LIBCPP_TEMPLATE_VIS basic_ostringstream
+    : public basic_ostream<_CharT, _Traits>
+{
+public:
+    typedef _CharT                         char_type;
+    typedef _Traits                        traits_type;
+    typedef typename traits_type::int_type int_type;
+    typedef typename traits_type::pos_type pos_type;
+    typedef typename traits_type::off_type off_type;
+    typedef _Allocator                     allocator_type;
+
+    typedef basic_string<char_type, traits_type, allocator_type> string_type;
+
+private:
+    basic_stringbuf<char_type, traits_type, allocator_type> __sb_;
+
+public:
+    // 30.8.4.1 [ostringstream.cons], constructors
+    _LIBCPP_INLINE_VISIBILITY
+    basic_ostringstream()
+        : basic_ostream<_CharT, _Traits>(&__sb_), __sb_(ios_base::out) {}
+
+    _LIBCPP_INLINE_VISIBILITY
+    explicit basic_ostringstream(ios_base::openmode __wch)
+        : basic_ostream<_CharT, _Traits>(&__sb_), __sb_(__wch | ios_base::out) {}
+
+    _LIBCPP_INLINE_VISIBILITY
+    explicit basic_ostringstream(const string_type& __s,
+                                 ios_base::openmode __wch = ios_base::out)
+        : basic_ostream<_CharT, _Traits>(&__sb_)
+        , __sb_(__s, __wch | ios_base::out)
+    { }
+
+    _LIBCPP_INLINE_VISIBILITY
+    basic_ostringstream(basic_ostringstream&& __rhs)
+        : basic_ostream<_CharT, _Traits>(_VSTD::move(__rhs))
+        , __sb_(_VSTD::move(__rhs.__sb_))
     {
         basic_ostream<_CharT, _Traits>::set_rdbuf(&__sb_);
     }
- 
-    // 27.8.2.2 Assign and swap: 
-    basic_ostringstream& operator=(basic_ostringstream&& __rhs) { 
+
+    // 27.8.2.2 Assign and swap:
+    basic_ostringstream& operator=(basic_ostringstream&& __rhs) {
         basic_ostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
         __sb_ = _VSTD::move(__rhs.__sb_);
         return *this;
     }
- 
-    _LIBCPP_INLINE_VISIBILITY 
-    void swap(basic_ostringstream& __rhs) { 
+
+    _LIBCPP_INLINE_VISIBILITY
+    void swap(basic_ostringstream& __rhs) {
         basic_ostream<char_type, traits_type>::swap(__rhs);
         __sb_.swap(__rhs.__sb_);
     }
- 
-    // 27.8.2.3 Members: 
-    _LIBCPP_INLINE_VISIBILITY 
-    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const { 
+
+    // 27.8.2.3 Members:
+    _LIBCPP_INLINE_VISIBILITY
+    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const {
         return const_cast<basic_stringbuf<char_type, traits_type, allocator_type>*>(&__sb_);
     }
-    _LIBCPP_INLINE_VISIBILITY 
-    string_type str() const { 
+    _LIBCPP_INLINE_VISIBILITY
+    string_type str() const {
         return __sb_.str();
     }
-    _LIBCPP_INLINE_VISIBILITY 
-    void str(const string_type& __s) { 
-        __sb_.str(__s); 
-    } 
-}; 
- 
-template <class _CharT, class _Traits, class _Allocator> 
-inline _LIBCPP_INLINE_VISIBILITY 
-void 
-swap(basic_ostringstream<_CharT, _Traits, _Allocator>& __x, 
-     basic_ostringstream<_CharT, _Traits, _Allocator>& __y) 
-{ 
-    __x.swap(__y); 
-} 
- 
-// basic_stringstream 
- 
-template <class _CharT, class _Traits, class _Allocator> 
-class _LIBCPP_TEMPLATE_VIS basic_stringstream 
-    : public basic_iostream<_CharT, _Traits> 
-{ 
-public: 
-    typedef _CharT                         char_type; 
-    typedef _Traits                        traits_type; 
-    typedef typename traits_type::int_type int_type; 
-    typedef typename traits_type::pos_type pos_type; 
-    typedef typename traits_type::off_type off_type; 
-    typedef _Allocator                     allocator_type; 
- 
-    typedef basic_string<char_type, traits_type, allocator_type> string_type; 
- 
-private: 
-    basic_stringbuf<char_type, traits_type, allocator_type> __sb_; 
- 
-public: 
-    // 30.8.5.1 [stringstream.cons], constructors 
-    _LIBCPP_INLINE_VISIBILITY 
-    basic_stringstream() 
-        : basic_iostream<_CharT, _Traits>(&__sb_), __sb_(ios_base::in | ios_base::out) {} 
- 
-    _LIBCPP_INLINE_VISIBILITY 
-    explicit basic_stringstream(ios_base::openmode __wch) 
-        : basic_iostream<_CharT, _Traits>(&__sb_), __sb_(__wch) {} 
- 
-    _LIBCPP_INLINE_VISIBILITY 
-    explicit basic_stringstream(const string_type& __s, 
-                                ios_base::openmode __wch = ios_base::in | ios_base::out) 
-        : basic_iostream<_CharT, _Traits>(&__sb_) 
-        , __sb_(__s, __wch) 
-    { } 
- 
-    _LIBCPP_INLINE_VISIBILITY 
-    basic_stringstream(basic_stringstream&& __rhs) 
-        : basic_iostream<_CharT, _Traits>(_VSTD::move(__rhs)) 
-        , __sb_(_VSTD::move(__rhs.__sb_)) 
+    _LIBCPP_INLINE_VISIBILITY
+    void str(const string_type& __s) {
+        __sb_.str(__s);
+    }
+};
+
+template <class _CharT, class _Traits, class _Allocator>
+inline _LIBCPP_INLINE_VISIBILITY
+void
+swap(basic_ostringstream<_CharT, _Traits, _Allocator>& __x,
+     basic_ostringstream<_CharT, _Traits, _Allocator>& __y)
+{
+    __x.swap(__y);
+}
+
+// basic_stringstream
+
+template <class _CharT, class _Traits, class _Allocator>
+class _LIBCPP_TEMPLATE_VIS basic_stringstream
+    : public basic_iostream<_CharT, _Traits>
+{
+public:
+    typedef _CharT                         char_type;
+    typedef _Traits                        traits_type;
+    typedef typename traits_type::int_type int_type;
+    typedef typename traits_type::pos_type pos_type;
+    typedef typename traits_type::off_type off_type;
+    typedef _Allocator                     allocator_type;
+
+    typedef basic_string<char_type, traits_type, allocator_type> string_type;
+
+private:
+    basic_stringbuf<char_type, traits_type, allocator_type> __sb_;
+
+public:
+    // 30.8.5.1 [stringstream.cons], constructors
+    _LIBCPP_INLINE_VISIBILITY
+    basic_stringstream()
+        : basic_iostream<_CharT, _Traits>(&__sb_), __sb_(ios_base::in | ios_base::out) {}
+
+    _LIBCPP_INLINE_VISIBILITY
+    explicit basic_stringstream(ios_base::openmode __wch)
+        : basic_iostream<_CharT, _Traits>(&__sb_), __sb_(__wch) {}
+
+    _LIBCPP_INLINE_VISIBILITY
+    explicit basic_stringstream(const string_type& __s,
+                                ios_base::openmode __wch = ios_base::in | ios_base::out)
+        : basic_iostream<_CharT, _Traits>(&__sb_)
+        , __sb_(__s, __wch)
+    { }
+
+    _LIBCPP_INLINE_VISIBILITY
+    basic_stringstream(basic_stringstream&& __rhs)
+        : basic_iostream<_CharT, _Traits>(_VSTD::move(__rhs))
+        , __sb_(_VSTD::move(__rhs.__sb_))
     {
         basic_istream<_CharT, _Traits>::set_rdbuf(&__sb_);
     }
- 
-    // 27.8.2.2 Assign and swap: 
-    basic_stringstream& operator=(basic_stringstream&& __rhs) { 
+
+    // 27.8.2.2 Assign and swap:
+    basic_stringstream& operator=(basic_stringstream&& __rhs) {
         basic_iostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
         __sb_ = _VSTD::move(__rhs.__sb_);
         return *this;
     }
-    _LIBCPP_INLINE_VISIBILITY 
-    void swap(basic_stringstream& __rhs) { 
+    _LIBCPP_INLINE_VISIBILITY
+    void swap(basic_stringstream& __rhs) {
         basic_iostream<char_type, traits_type>::swap(__rhs);
         __sb_.swap(__rhs.__sb_);
     }
- 
-    // 27.8.2.3 Members: 
-    _LIBCPP_INLINE_VISIBILITY 
-    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const { 
+
+    // 27.8.2.3 Members:
+    _LIBCPP_INLINE_VISIBILITY
+    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const {
         return const_cast<basic_stringbuf<char_type, traits_type, allocator_type>*>(&__sb_);
     }
-    _LIBCPP_INLINE_VISIBILITY 
-    string_type str() const { 
+    _LIBCPP_INLINE_VISIBILITY
+    string_type str() const {
         return __sb_.str();
     }
-    _LIBCPP_INLINE_VISIBILITY 
-    void str(const string_type& __s) { 
-        __sb_.str(__s); 
-    } 
-}; 
- 
-template <class _CharT, class _Traits, class _Allocator> 
-inline _LIBCPP_INLINE_VISIBILITY 
-void 
-swap(basic_stringstream<_CharT, _Traits, _Allocator>& __x, 
-     basic_stringstream<_CharT, _Traits, _Allocator>& __y) 
-{ 
-    __x.swap(__y); 
-} 
- 
-#if defined(_LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1) 
-_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_stringbuf<char>) 
-_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_stringstream<char>) 
-_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ostringstream<char>) 
-_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_istringstream<char>) 
-#endif 
- 
-_LIBCPP_END_NAMESPACE_STD 
- 
-_LIBCPP_POP_MACROS 
- 
-#endif // _LIBCPP_SSTREAM 
+    _LIBCPP_INLINE_VISIBILITY
+    void str(const string_type& __s) {
+        __sb_.str(__s);
+    }
+};
+
+template <class _CharT, class _Traits, class _Allocator>
+inline _LIBCPP_INLINE_VISIBILITY
+void
+swap(basic_stringstream<_CharT, _Traits, _Allocator>& __x,
+     basic_stringstream<_CharT, _Traits, _Allocator>& __y)
+{
+    __x.swap(__y);
+}
+
+#if defined(_LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_stringbuf<char>)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_stringstream<char>)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ostringstream<char>)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_istringstream<char>)
+#endif
+
+_LIBCPP_END_NAMESPACE_STD
+
+_LIBCPP_POP_MACROS
+
+#endif // _LIBCPP_SSTREAM