path: root/contrib/libs/cxxsupp/libcxx/include/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) 
            { 
                this->pbump(INT_MAX);
                __sz -= INT_MAX;
            } 
            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_); 
        } 
        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_)) 
    {
        basic_istream<_CharT, _Traits>::set_rdbuf(&__sb_);
    }
 
    // 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) { 
        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 { 
        return const_cast<basic_stringbuf<char_type, traits_type, allocator_type>*>(&__sb_);
    }
    _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_)) 
    {
        basic_ostream<_CharT, _Traits>::set_rdbuf(&__sb_);
    }
 
    // 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) { 
        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 { 
        return const_cast<basic_stringbuf<char_type, traits_type, allocator_type>*>(&__sb_);
    }
    _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_)) 
    {
        basic_istream<_CharT, _Traits>::set_rdbuf(&__sb_);
    }
 
    // 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) { 
        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 { 
        return const_cast<basic_stringbuf<char_type, traits_type, allocator_type>*>(&__sb_);
    }
    _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