1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP_SSTREAM
11#define _LIBCPP_SSTREAM
12
13/*
14    sstream synopsis
15
16template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
17class basic_stringbuf
18    : public basic_streambuf<charT, traits>
19{
20public:
21    typedef charT                          char_type;
22    typedef traits                         traits_type;
23    typedef typename traits_type::int_type int_type;
24    typedef typename traits_type::pos_type pos_type;
25    typedef typename traits_type::off_type off_type;
26    typedef Allocator                      allocator_type;
27
28    // 27.8.1.1 [stringbuf.cons], constructors:
29    explicit basic_stringbuf(ios_base::openmode which = ios_base::in | ios_base::out); // before C++20
30    basic_stringbuf() : basic_stringbuf(ios_base::in | ios_base::out) {}               // C++20
31    explicit basic_stringbuf(ios_base::openmode which);                                // C++20
32    explicit basic_stringbuf(const basic_string<char_type, traits_type, allocator_type>& str,
33                             ios_base::openmode which = ios_base::in | ios_base::out);
34    basic_stringbuf(basic_stringbuf&& rhs);
35
36    // 27.8.1.2 Assign and swap:
37    basic_stringbuf& operator=(basic_stringbuf&& rhs);
38    void swap(basic_stringbuf& rhs);
39
40    // 27.8.1.3 Get and set:
41    basic_string<char_type, traits_type, allocator_type> str() const;
42    void str(const basic_string<char_type, traits_type, allocator_type>& s);
43
44protected:
45    // 27.8.1.4 Overridden virtual functions:
46    virtual int_type underflow();
47    virtual int_type pbackfail(int_type c = traits_type::eof());
48    virtual int_type overflow (int_type c = traits_type::eof());
49    virtual basic_streambuf<char_type, traits_type>* setbuf(char_type*, streamsize);
50    virtual pos_type seekoff(off_type off, ios_base::seekdir way,
51                             ios_base::openmode which = ios_base::in | ios_base::out);
52    virtual pos_type seekpos(pos_type sp,
53                             ios_base::openmode which = ios_base::in | ios_base::out);
54};
55
56template <class charT, class traits, class Allocator>
57  void swap(basic_stringbuf<charT, traits, Allocator>& x,
58            basic_stringbuf<charT, traits, Allocator>& y);
59
60typedef basic_stringbuf<char>    stringbuf;
61typedef basic_stringbuf<wchar_t> wstringbuf;
62
63template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
64class basic_istringstream
65    : public basic_istream<charT, traits>
66{
67public:
68    typedef charT                          char_type;
69    typedef traits                         traits_type;
70    typedef typename traits_type::int_type int_type;
71    typedef typename traits_type::pos_type pos_type;
72    typedef typename traits_type::off_type off_type;
73    typedef Allocator                      allocator_type;
74
75    // 27.8.2.1 Constructors:
76    explicit basic_istringstream(ios_base::openmode which = ios_base::in); // before C++20
77    basic_istringstream() : basic_istringstream(ios_base::in) {}           // C++20
78    explicit basic_istringstream(ios_base::openmode which);                // C++20
79
80    explicit basic_istringstream(const basic_string<char_type, traits_type,allocator_type>& str,
81                                 ios_base::openmode which = ios_base::in);
82    basic_istringstream(basic_istringstream&& rhs);
83
84    // 27.8.2.2 Assign and swap:
85    basic_istringstream& operator=(basic_istringstream&& rhs);
86    void swap(basic_istringstream& rhs);
87
88    // 27.8.2.3 Members:
89    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const;
90    basic_string<char_type, traits_type, allocator_type> str() const;
91    void str(const basic_string<char_type, traits_type, allocator_type>& s);
92};
93
94template <class charT, class traits, class Allocator>
95  void swap(basic_istringstream<charT, traits, Allocator>& x,
96            basic_istringstream<charT, traits, Allocator>& y);
97
98typedef basic_istringstream<char>    istringstream;
99typedef basic_istringstream<wchar_t> wistringstream;
100
101template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
102class basic_ostringstream
103    : public basic_ostream<charT, traits>
104{
105public:
106    // types:
107    typedef charT                          char_type;
108    typedef traits                         traits_type;
109    typedef typename traits_type::int_type int_type;
110    typedef typename traits_type::pos_type pos_type;
111    typedef typename traits_type::off_type off_type;
112    typedef Allocator                      allocator_type;
113
114    // 27.8.3.1 Constructors/destructor:
115    explicit basic_ostringstream(ios_base::openmode which = ios_base::out); // before C++20
116    basic_ostringstream() : basic_ostringstream(ios_base::out) {}           // C++20
117    explicit basic_ostringstream(ios_base::openmode which);                 // C++20
118
119    explicit basic_ostringstream(const basic_string<char_type, traits_type, allocator_type>& str,
120                                 ios_base::openmode which = ios_base::out);
121    basic_ostringstream(basic_ostringstream&& rhs);
122
123    // 27.8.3.2 Assign/swap:
124    basic_ostringstream& operator=(basic_ostringstream&& rhs);
125    void swap(basic_ostringstream& rhs);
126
127    // 27.8.3.3 Members:
128    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const;
129    basic_string<char_type, traits_type, allocator_type> str() const;
130    void str(const basic_string<char_type, traits_type, allocator_type>& s);
131};
132
133template <class charT, class traits, class Allocator>
134  void swap(basic_ostringstream<charT, traits, Allocator>& x,
135            basic_ostringstream<charT, traits, Allocator>& y);
136
137typedef basic_ostringstream<char>    ostringstream;
138typedef basic_ostringstream<wchar_t> wostringstream;
139
140template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
141class basic_stringstream
142    : public basic_iostream<charT, traits>
143{
144public:
145    // types:
146    typedef charT                          char_type;
147    typedef traits                         traits_type;
148    typedef typename traits_type::int_type int_type;
149    typedef typename traits_type::pos_type pos_type;
150    typedef typename traits_type::off_type off_type;
151    typedef Allocator                      allocator_type;
152
153    // constructors/destructor
154    explicit basic_stringstream(ios_base::openmode which = ios_base::out | ios_base::in); // before C++20
155    basic_stringstream() : basic_stringstream(ios_base::out | ios_base::in) {}            // C++20
156    explicit basic_stringstream(ios_base::openmode which);                                // C++20
157
158    explicit basic_stringstream(const basic_string<char_type, traits_type, allocator_type>& str,
159                                ios_base::openmode which = ios_base::out|ios_base::in);
160    basic_stringstream(basic_stringstream&& rhs);
161
162    // 27.8.5.1 Assign/swap:
163    basic_stringstream& operator=(basic_stringstream&& rhs);
164    void swap(basic_stringstream& rhs);
165
166    // Members:
167    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const;
168    basic_string<char_type, traits_type, allocator_type> str() const;
169    void str(const basic_string<char_type, traits_type, allocator_type>& str);
170};
171
172template <class charT, class traits, class Allocator>
173  void swap(basic_stringstream<charT, traits, Allocator>& x,
174            basic_stringstream<charT, traits, Allocator>& y);
175
176typedef basic_stringstream<char>    stringstream;
177typedef basic_stringstream<wchar_t> wstringstream;
178
179}  // std
180
181*/
182
183#include <__assert> // all public C++ headers provide the assertion handler
184#include <__config>
185#include <__utility/swap.h>
186#include <istream>
187#include <ostream>
188#include <string>
189#include <version>
190
191#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
192#  pragma GCC system_header
193#endif
194
195_LIBCPP_PUSH_MACROS
196#include <__undef_macros>
197
198
199_LIBCPP_BEGIN_NAMESPACE_STD
200
201// basic_stringbuf
202
203template <class _CharT, class _Traits, class _Allocator>
204class _LIBCPP_TEMPLATE_VIS basic_stringbuf
205    : public basic_streambuf<_CharT, _Traits>
206{
207public:
208    typedef _CharT                         char_type;
209    typedef _Traits                        traits_type;
210    typedef typename traits_type::int_type int_type;
211    typedef typename traits_type::pos_type pos_type;
212    typedef typename traits_type::off_type off_type;
213    typedef _Allocator                     allocator_type;
214
215    typedef basic_string<char_type, traits_type, allocator_type> string_type;
216
217private:
218
219    string_type __str_;
220    mutable char_type* __hm_;
221    ios_base::openmode __mode_;
222
223public:
224    // 30.8.2.1 [stringbuf.cons], constructors
225    _LIBCPP_INLINE_VISIBILITY
226    basic_stringbuf()
227        : __hm_(nullptr), __mode_(ios_base::in | ios_base::out) {}
228
229    _LIBCPP_INLINE_VISIBILITY
230    explicit basic_stringbuf(ios_base::openmode __wch)
231        : __hm_(nullptr), __mode_(__wch) {}
232
233    _LIBCPP_INLINE_VISIBILITY
234    explicit basic_stringbuf(const string_type& __s,
235                             ios_base::openmode __wch = ios_base::in | ios_base::out)
236        : __str_(__s.get_allocator()), __hm_(nullptr), __mode_(__wch)
237    {
238        str(__s);
239    }
240
241    basic_stringbuf(basic_stringbuf&& __rhs);
242
243    // 27.8.1.2 Assign and swap:
244    basic_stringbuf& operator=(basic_stringbuf&& __rhs);
245    void swap(basic_stringbuf& __rhs);
246
247    // 27.8.1.3 Get and set:
248    string_type str() const;
249    void str(const string_type& __s);
250
251protected:
252    // 27.8.1.4 Overridden virtual functions:
253    virtual int_type underflow();
254    virtual int_type pbackfail(int_type __c = traits_type::eof());
255    virtual int_type overflow (int_type __c = traits_type::eof());
256    virtual pos_type seekoff(off_type __off, ios_base::seekdir __way,
257                             ios_base::openmode __wch = ios_base::in | ios_base::out);
258    _LIBCPP_INLINE_VISIBILITY
259    virtual pos_type seekpos(pos_type __sp,
260                             ios_base::openmode __wch = ios_base::in | ios_base::out) {
261        return seekoff(__sp, ios_base::beg, __wch);
262    }
263};
264
265template <class _CharT, class _Traits, class _Allocator>
266basic_stringbuf<_CharT, _Traits, _Allocator>::basic_stringbuf(basic_stringbuf&& __rhs)
267    : __mode_(__rhs.__mode_)
268{
269    char_type* __p = const_cast<char_type*>(__rhs.__str_.data());
270    ptrdiff_t __binp = -1;
271    ptrdiff_t __ninp = -1;
272    ptrdiff_t __einp = -1;
273    if (__rhs.eback() != nullptr)
274    {
275        __binp = __rhs.eback() - __p;
276        __ninp = __rhs.gptr() - __p;
277        __einp = __rhs.egptr() - __p;
278    }
279    ptrdiff_t __bout = -1;
280    ptrdiff_t __nout = -1;
281    ptrdiff_t __eout = -1;
282    if (__rhs.pbase() != nullptr)
283    {
284        __bout = __rhs.pbase() - __p;
285        __nout = __rhs.pptr() - __p;
286        __eout = __rhs.epptr() - __p;
287    }
288    ptrdiff_t __hm = __rhs.__hm_ == nullptr ? -1 : __rhs.__hm_ - __p;
289    __str_ = _VSTD::move(__rhs.__str_);
290    __p = const_cast<char_type*>(__str_.data());
291    if (__binp != -1)
292        this->setg(__p + __binp, __p + __ninp, __p + __einp);
293    if (__bout != -1)
294    {
295        this->setp(__p + __bout, __p + __eout);
296        this->__pbump(__nout);
297    }
298    __hm_ = __hm == -1 ? nullptr : __p + __hm;
299    __p = const_cast<char_type*>(__rhs.__str_.data());
300    __rhs.setg(__p, __p, __p);
301    __rhs.setp(__p, __p);
302    __rhs.__hm_ = __p;
303    this->pubimbue(__rhs.getloc());
304}
305
306template <class _CharT, class _Traits, class _Allocator>
307basic_stringbuf<_CharT, _Traits, _Allocator>&
308basic_stringbuf<_CharT, _Traits, _Allocator>::operator=(basic_stringbuf&& __rhs)
309{
310    char_type* __p = const_cast<char_type*>(__rhs.__str_.data());
311    ptrdiff_t __binp = -1;
312    ptrdiff_t __ninp = -1;
313    ptrdiff_t __einp = -1;
314    if (__rhs.eback() != nullptr)
315    {
316        __binp = __rhs.eback() - __p;
317        __ninp = __rhs.gptr() - __p;
318        __einp = __rhs.egptr() - __p;
319    }
320    ptrdiff_t __bout = -1;
321    ptrdiff_t __nout = -1;
322    ptrdiff_t __eout = -1;
323    if (__rhs.pbase() != nullptr)
324    {
325        __bout = __rhs.pbase() - __p;
326        __nout = __rhs.pptr() - __p;
327        __eout = __rhs.epptr() - __p;
328    }
329    ptrdiff_t __hm = __rhs.__hm_ == nullptr ? -1 : __rhs.__hm_ - __p;
330    __str_ = _VSTD::move(__rhs.__str_);
331    __p = const_cast<char_type*>(__str_.data());
332    if (__binp != -1)
333        this->setg(__p + __binp, __p + __ninp, __p + __einp);
334    else
335        this->setg(nullptr, nullptr, nullptr);
336    if (__bout != -1)
337    {
338        this->setp(__p + __bout, __p + __eout);
339        this->__pbump(__nout);
340    }
341    else
342        this->setp(nullptr, nullptr);
343
344    __hm_ = __hm == -1 ? nullptr : __p + __hm;
345    __mode_ = __rhs.__mode_;
346    __p = const_cast<char_type*>(__rhs.__str_.data());
347    __rhs.setg(__p, __p, __p);
348    __rhs.setp(__p, __p);
349    __rhs.__hm_ = __p;
350    this->pubimbue(__rhs.getloc());
351    return *this;
352}
353
354template <class _CharT, class _Traits, class _Allocator>
355void
356basic_stringbuf<_CharT, _Traits, _Allocator>::swap(basic_stringbuf& __rhs)
357{
358    char_type* __p = const_cast<char_type*>(__rhs.__str_.data());
359    ptrdiff_t __rbinp = -1;
360    ptrdiff_t __rninp = -1;
361    ptrdiff_t __reinp = -1;
362    if (__rhs.eback() != nullptr)
363    {
364        __rbinp = __rhs.eback() - __p;
365        __rninp = __rhs.gptr() - __p;
366        __reinp = __rhs.egptr() - __p;
367    }
368    ptrdiff_t __rbout = -1;
369    ptrdiff_t __rnout = -1;
370    ptrdiff_t __reout = -1;
371    if (__rhs.pbase() != nullptr)
372    {
373        __rbout = __rhs.pbase() - __p;
374        __rnout = __rhs.pptr() - __p;
375        __reout = __rhs.epptr() - __p;
376    }
377    ptrdiff_t __rhm = __rhs.__hm_ == nullptr ? -1 : __rhs.__hm_ - __p;
378    __p = const_cast<char_type*>(__str_.data());
379    ptrdiff_t __lbinp = -1;
380    ptrdiff_t __lninp = -1;
381    ptrdiff_t __leinp = -1;
382    if (this->eback() != nullptr)
383    {
384        __lbinp = this->eback() - __p;
385        __lninp = this->gptr() - __p;
386        __leinp = this->egptr() - __p;
387    }
388    ptrdiff_t __lbout = -1;
389    ptrdiff_t __lnout = -1;
390    ptrdiff_t __leout = -1;
391    if (this->pbase() != nullptr)
392    {
393        __lbout = this->pbase() - __p;
394        __lnout = this->pptr() - __p;
395        __leout = this->epptr() - __p;
396    }
397    ptrdiff_t __lhm = __hm_ == nullptr ? -1 : __hm_ - __p;
398    _VSTD::swap(__mode_, __rhs.__mode_);
399    __str_.swap(__rhs.__str_);
400    __p = const_cast<char_type*>(__str_.data());
401    if (__rbinp != -1)
402        this->setg(__p + __rbinp, __p + __rninp, __p + __reinp);
403    else
404        this->setg(nullptr, nullptr, nullptr);
405    if (__rbout != -1)
406    {
407        this->setp(__p + __rbout, __p + __reout);
408        this->__pbump(__rnout);
409    }
410    else
411        this->setp(nullptr, nullptr);
412    __hm_ = __rhm == -1 ? nullptr : __p + __rhm;
413    __p = const_cast<char_type*>(__rhs.__str_.data());
414    if (__lbinp != -1)
415        __rhs.setg(__p + __lbinp, __p + __lninp, __p + __leinp);
416    else
417        __rhs.setg(nullptr, nullptr, nullptr);
418    if (__lbout != -1)
419    {
420        __rhs.setp(__p + __lbout, __p + __leout);
421        __rhs.__pbump(__lnout);
422    }
423    else
424        __rhs.setp(nullptr, nullptr);
425    __rhs.__hm_ = __lhm == -1 ? nullptr : __p + __lhm;
426    locale __tl = __rhs.getloc();
427    __rhs.pubimbue(this->getloc());
428    this->pubimbue(__tl);
429}
430
431template <class _CharT, class _Traits, class _Allocator>
432inline _LIBCPP_INLINE_VISIBILITY
433void
434swap(basic_stringbuf<_CharT, _Traits, _Allocator>& __x,
435     basic_stringbuf<_CharT, _Traits, _Allocator>& __y)
436{
437    __x.swap(__y);
438}
439
440template <class _CharT, class _Traits, class _Allocator>
441basic_string<_CharT, _Traits, _Allocator>
442basic_stringbuf<_CharT, _Traits, _Allocator>::str() const
443{
444    if (__mode_ & ios_base::out)
445    {
446        if (__hm_ < this->pptr())
447            __hm_ = this->pptr();
448        return string_type(this->pbase(), __hm_, __str_.get_allocator());
449    }
450    else if (__mode_ & ios_base::in)
451        return string_type(this->eback(), this->egptr(), __str_.get_allocator());
452    return string_type(__str_.get_allocator());
453}
454
455template <class _CharT, class _Traits, class _Allocator>
456void
457basic_stringbuf<_CharT, _Traits, _Allocator>::str(const string_type& __s)
458{
459    __str_ = __s;
460    __hm_ = nullptr;
461    if (__mode_ & ios_base::in)
462    {
463        __hm_ = const_cast<char_type*>(__str_.data()) + __str_.size();
464        this->setg(const_cast<char_type*>(__str_.data()),
465                   const_cast<char_type*>(__str_.data()),
466                   __hm_);
467    }
468    if (__mode_ & ios_base::out)
469    {
470        typename string_type::size_type __sz = __str_.size();
471        __hm_ = const_cast<char_type*>(__str_.data()) + __sz;
472        __str_.resize(__str_.capacity());
473        this->setp(const_cast<char_type*>(__str_.data()),
474                   const_cast<char_type*>(__str_.data()) + __str_.size());
475        if (__mode_ & (ios_base::app | ios_base::ate))
476        {
477            while (__sz > INT_MAX)
478            {
479                this->pbump(INT_MAX);
480                __sz -= INT_MAX;
481            }
482            if (__sz > 0)
483                this->pbump(__sz);
484        }
485    }
486}
487
488template <class _CharT, class _Traits, class _Allocator>
489typename basic_stringbuf<_CharT, _Traits, _Allocator>::int_type
490basic_stringbuf<_CharT, _Traits, _Allocator>::underflow()
491{
492    if (__hm_ < this->pptr())
493        __hm_ = this->pptr();
494    if (__mode_ & ios_base::in)
495    {
496        if (this->egptr() < __hm_)
497            this->setg(this->eback(), this->gptr(), __hm_);
498        if (this->gptr() < this->egptr())
499            return traits_type::to_int_type(*this->gptr());
500    }
501    return traits_type::eof();
502}
503
504template <class _CharT, class _Traits, class _Allocator>
505typename basic_stringbuf<_CharT, _Traits, _Allocator>::int_type
506basic_stringbuf<_CharT, _Traits, _Allocator>::pbackfail(int_type __c)
507{
508    if (__hm_ < this->pptr())
509        __hm_ = this->pptr();
510    if (this->eback() < this->gptr())
511    {
512        if (traits_type::eq_int_type(__c, traits_type::eof()))
513        {
514            this->setg(this->eback(), this->gptr()-1, __hm_);
515            return traits_type::not_eof(__c);
516        }
517        if ((__mode_ & ios_base::out) ||
518            traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1]))
519        {
520            this->setg(this->eback(), this->gptr()-1, __hm_);
521            *this->gptr() = traits_type::to_char_type(__c);
522            return __c;
523        }
524    }
525    return traits_type::eof();
526}
527
528template <class _CharT, class _Traits, class _Allocator>
529typename basic_stringbuf<_CharT, _Traits, _Allocator>::int_type
530basic_stringbuf<_CharT, _Traits, _Allocator>::overflow(int_type __c)
531{
532    if (!traits_type::eq_int_type(__c, traits_type::eof()))
533    {
534        ptrdiff_t __ninp = this->gptr()  - this->eback();
535        if (this->pptr() == this->epptr())
536        {
537            if (!(__mode_ & ios_base::out))
538                return traits_type::eof();
539#ifndef _LIBCPP_NO_EXCEPTIONS
540            try
541            {
542#endif // _LIBCPP_NO_EXCEPTIONS
543                ptrdiff_t __nout = this->pptr()  - this->pbase();
544                ptrdiff_t __hm = __hm_ - this->pbase();
545                __str_.push_back(char_type());
546                __str_.resize(__str_.capacity());
547                char_type* __p = const_cast<char_type*>(__str_.data());
548                this->setp(__p, __p + __str_.size());
549                this->__pbump(__nout);
550                __hm_ = this->pbase() + __hm;
551#ifndef _LIBCPP_NO_EXCEPTIONS
552            }
553            catch (...)
554            {
555                return traits_type::eof();
556            }
557#endif // _LIBCPP_NO_EXCEPTIONS
558        }
559        __hm_ = _VSTD::max(this->pptr() + 1, __hm_);
560        if (__mode_ & ios_base::in)
561        {
562            char_type* __p = const_cast<char_type*>(__str_.data());
563            this->setg(__p, __p + __ninp, __hm_);
564        }
565        return this->sputc(traits_type::to_char_type(__c));
566    }
567    return traits_type::not_eof(__c);
568}
569
570template <class _CharT, class _Traits, class _Allocator>
571typename basic_stringbuf<_CharT, _Traits, _Allocator>::pos_type
572basic_stringbuf<_CharT, _Traits, _Allocator>::seekoff(off_type __off,
573                                                      ios_base::seekdir __way,
574                                                      ios_base::openmode __wch)
575{
576    if (__hm_ < this->pptr())
577        __hm_ = this->pptr();
578    if ((__wch & (ios_base::in | ios_base::out)) == 0)
579        return pos_type(-1);
580    if ((__wch & (ios_base::in | ios_base::out)) == (ios_base::in | ios_base::out)
581        && __way == ios_base::cur)
582        return pos_type(-1);
583    const ptrdiff_t __hm = __hm_ == nullptr ? 0 : __hm_ - __str_.data();
584    off_type __noff;
585    switch (__way)
586    {
587    case ios_base::beg:
588        __noff = 0;
589        break;
590    case ios_base::cur:
591        if (__wch & ios_base::in)
592            __noff = this->gptr() - this->eback();
593        else
594            __noff = this->pptr() - this->pbase();
595        break;
596    case ios_base::end:
597        __noff = __hm;
598        break;
599    default:
600        return pos_type(-1);
601    }
602    __noff += __off;
603    if (__noff < 0 || __hm < __noff)
604        return pos_type(-1);
605    if (__noff != 0)
606    {
607        if ((__wch & ios_base::in) && this->gptr() == nullptr)
608            return pos_type(-1);
609        if ((__wch & ios_base::out) && this->pptr() == nullptr)
610            return pos_type(-1);
611    }
612    if (__wch & ios_base::in)
613        this->setg(this->eback(), this->eback() + __noff, __hm_);
614    if (__wch & ios_base::out)
615    {
616        this->setp(this->pbase(), this->epptr());
617        this->pbump(__noff);
618    }
619    return pos_type(__noff);
620}
621
622// basic_istringstream
623
624template <class _CharT, class _Traits, class _Allocator>
625class _LIBCPP_TEMPLATE_VIS basic_istringstream
626    : public basic_istream<_CharT, _Traits>
627{
628public:
629    typedef _CharT                         char_type;
630    typedef _Traits                        traits_type;
631    typedef typename traits_type::int_type int_type;
632    typedef typename traits_type::pos_type pos_type;
633    typedef typename traits_type::off_type off_type;
634    typedef _Allocator                     allocator_type;
635
636    typedef basic_string<char_type, traits_type, allocator_type> string_type;
637
638private:
639    basic_stringbuf<char_type, traits_type, allocator_type> __sb_;
640
641public:
642    // 30.8.3.1 [istringstream.cons], constructors
643    _LIBCPP_INLINE_VISIBILITY
644    basic_istringstream()
645        : basic_istream<_CharT, _Traits>(&__sb_), __sb_(ios_base::in) {}
646
647    _LIBCPP_INLINE_VISIBILITY
648    explicit basic_istringstream(ios_base::openmode __wch)
649        : basic_istream<_CharT, _Traits>(&__sb_), __sb_(__wch | ios_base::in) {}
650
651    _LIBCPP_INLINE_VISIBILITY
652    explicit basic_istringstream(const string_type& __s,
653                                 ios_base::openmode __wch = ios_base::in)
654        : basic_istream<_CharT, _Traits>(&__sb_)
655        , __sb_(__s, __wch | ios_base::in)
656    { }
657
658    _LIBCPP_INLINE_VISIBILITY
659    basic_istringstream(basic_istringstream&& __rhs)
660        : basic_istream<_CharT, _Traits>(_VSTD::move(__rhs))
661        , __sb_(_VSTD::move(__rhs.__sb_))
662    {
663        basic_istream<_CharT, _Traits>::set_rdbuf(&__sb_);
664    }
665
666    // 27.8.2.2 Assign and swap:
667    basic_istringstream& operator=(basic_istringstream&& __rhs) {
668        basic_istream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
669        __sb_ = _VSTD::move(__rhs.__sb_);
670        return *this;
671    }
672    _LIBCPP_INLINE_VISIBILITY
673    void swap(basic_istringstream& __rhs) {
674        basic_istream<char_type, traits_type>::swap(__rhs);
675        __sb_.swap(__rhs.__sb_);
676    }
677
678    // 27.8.2.3 Members:
679    _LIBCPP_INLINE_VISIBILITY
680    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const {
681        return const_cast<basic_stringbuf<char_type, traits_type, allocator_type>*>(&__sb_);
682    }
683    _LIBCPP_INLINE_VISIBILITY
684    string_type str() const {
685        return __sb_.str();
686    }
687    _LIBCPP_INLINE_VISIBILITY
688    void str(const string_type& __s) {
689        __sb_.str(__s);
690    }
691};
692
693template <class _CharT, class _Traits, class _Allocator>
694inline _LIBCPP_INLINE_VISIBILITY
695void
696swap(basic_istringstream<_CharT, _Traits, _Allocator>& __x,
697     basic_istringstream<_CharT, _Traits, _Allocator>& __y)
698{
699    __x.swap(__y);
700}
701
702// basic_ostringstream
703
704template <class _CharT, class _Traits, class _Allocator>
705class _LIBCPP_TEMPLATE_VIS basic_ostringstream
706    : public basic_ostream<_CharT, _Traits>
707{
708public:
709    typedef _CharT                         char_type;
710    typedef _Traits                        traits_type;
711    typedef typename traits_type::int_type int_type;
712    typedef typename traits_type::pos_type pos_type;
713    typedef typename traits_type::off_type off_type;
714    typedef _Allocator                     allocator_type;
715
716    typedef basic_string<char_type, traits_type, allocator_type> string_type;
717
718private:
719    basic_stringbuf<char_type, traits_type, allocator_type> __sb_;
720
721public:
722    // 30.8.4.1 [ostringstream.cons], constructors
723    _LIBCPP_INLINE_VISIBILITY
724    basic_ostringstream()
725        : basic_ostream<_CharT, _Traits>(&__sb_), __sb_(ios_base::out) {}
726
727    _LIBCPP_INLINE_VISIBILITY
728    explicit basic_ostringstream(ios_base::openmode __wch)
729        : basic_ostream<_CharT, _Traits>(&__sb_), __sb_(__wch | ios_base::out) {}
730
731    _LIBCPP_INLINE_VISIBILITY
732    explicit basic_ostringstream(const string_type& __s,
733                                 ios_base::openmode __wch = ios_base::out)
734        : basic_ostream<_CharT, _Traits>(&__sb_)
735        , __sb_(__s, __wch | ios_base::out)
736    { }
737
738    _LIBCPP_INLINE_VISIBILITY
739    basic_ostringstream(basic_ostringstream&& __rhs)
740        : basic_ostream<_CharT, _Traits>(_VSTD::move(__rhs))
741        , __sb_(_VSTD::move(__rhs.__sb_))
742    {
743        basic_ostream<_CharT, _Traits>::set_rdbuf(&__sb_);
744    }
745
746    // 27.8.2.2 Assign and swap:
747    basic_ostringstream& operator=(basic_ostringstream&& __rhs) {
748        basic_ostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
749        __sb_ = _VSTD::move(__rhs.__sb_);
750        return *this;
751    }
752
753    _LIBCPP_INLINE_VISIBILITY
754    void swap(basic_ostringstream& __rhs) {
755        basic_ostream<char_type, traits_type>::swap(__rhs);
756        __sb_.swap(__rhs.__sb_);
757    }
758
759    // 27.8.2.3 Members:
760    _LIBCPP_INLINE_VISIBILITY
761    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const {
762        return const_cast<basic_stringbuf<char_type, traits_type, allocator_type>*>(&__sb_);
763    }
764    _LIBCPP_INLINE_VISIBILITY
765    string_type str() const {
766        return __sb_.str();
767    }
768    _LIBCPP_INLINE_VISIBILITY
769    void str(const string_type& __s) {
770        __sb_.str(__s);
771    }
772};
773
774template <class _CharT, class _Traits, class _Allocator>
775inline _LIBCPP_INLINE_VISIBILITY
776void
777swap(basic_ostringstream<_CharT, _Traits, _Allocator>& __x,
778     basic_ostringstream<_CharT, _Traits, _Allocator>& __y)
779{
780    __x.swap(__y);
781}
782
783// basic_stringstream
784
785template <class _CharT, class _Traits, class _Allocator>
786class _LIBCPP_TEMPLATE_VIS basic_stringstream
787    : public basic_iostream<_CharT, _Traits>
788{
789public:
790    typedef _CharT                         char_type;
791    typedef _Traits                        traits_type;
792    typedef typename traits_type::int_type int_type;
793    typedef typename traits_type::pos_type pos_type;
794    typedef typename traits_type::off_type off_type;
795    typedef _Allocator                     allocator_type;
796
797    typedef basic_string<char_type, traits_type, allocator_type> string_type;
798
799private:
800    basic_stringbuf<char_type, traits_type, allocator_type> __sb_;
801
802public:
803    // 30.8.5.1 [stringstream.cons], constructors
804    _LIBCPP_INLINE_VISIBILITY
805    basic_stringstream()
806        : basic_iostream<_CharT, _Traits>(&__sb_), __sb_(ios_base::in | ios_base::out) {}
807
808    _LIBCPP_INLINE_VISIBILITY
809    explicit basic_stringstream(ios_base::openmode __wch)
810        : basic_iostream<_CharT, _Traits>(&__sb_), __sb_(__wch) {}
811
812    _LIBCPP_INLINE_VISIBILITY
813    explicit basic_stringstream(const string_type& __s,
814                                ios_base::openmode __wch = ios_base::in | ios_base::out)
815        : basic_iostream<_CharT, _Traits>(&__sb_)
816        , __sb_(__s, __wch)
817    { }
818
819    _LIBCPP_INLINE_VISIBILITY
820    basic_stringstream(basic_stringstream&& __rhs)
821        : basic_iostream<_CharT, _Traits>(_VSTD::move(__rhs))
822        , __sb_(_VSTD::move(__rhs.__sb_))
823    {
824        basic_istream<_CharT, _Traits>::set_rdbuf(&__sb_);
825    }
826
827    // 27.8.2.2 Assign and swap:
828    basic_stringstream& operator=(basic_stringstream&& __rhs) {
829        basic_iostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
830        __sb_ = _VSTD::move(__rhs.__sb_);
831        return *this;
832    }
833    _LIBCPP_INLINE_VISIBILITY
834    void swap(basic_stringstream& __rhs) {
835        basic_iostream<char_type, traits_type>::swap(__rhs);
836        __sb_.swap(__rhs.__sb_);
837    }
838
839    // 27.8.2.3 Members:
840    _LIBCPP_INLINE_VISIBILITY
841    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const {
842        return const_cast<basic_stringbuf<char_type, traits_type, allocator_type>*>(&__sb_);
843    }
844    _LIBCPP_INLINE_VISIBILITY
845    string_type str() const {
846        return __sb_.str();
847    }
848    _LIBCPP_INLINE_VISIBILITY
849    void str(const string_type& __s) {
850        __sb_.str(__s);
851    }
852};
853
854template <class _CharT, class _Traits, class _Allocator>
855inline _LIBCPP_INLINE_VISIBILITY
856void
857swap(basic_stringstream<_CharT, _Traits, _Allocator>& __x,
858     basic_stringstream<_CharT, _Traits, _Allocator>& __y)
859{
860    __x.swap(__y);
861}
862
863#if defined(_LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1)
864extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_stringbuf<char>;
865extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_stringstream<char>;
866extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ostringstream<char>;
867extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_istringstream<char>;
868#endif
869
870_LIBCPP_END_NAMESPACE_STD
871
872_LIBCPP_POP_MACROS
873
874#endif // _LIBCPP_SSTREAM
875