xref: /freebsd/contrib/llvm-project/libcxx/include/sstream (revision 069ac18495ad8fde2748bc94b0f80a50250bb01d) 
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 [sstream.syn]
15
16// Class template basic_stringbuf [stringbuf]
17template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
18class basic_stringbuf
19    : public basic_streambuf<charT, traits>
20{
21public:
22    typedef charT                          char_type;
23    typedef traits                         traits_type;
24    typedef typename traits_type::int_type int_type;
25    typedef typename traits_type::pos_type pos_type;
26    typedef typename traits_type::off_type off_type;
27    typedef Allocator                      allocator_type;
28
29    // [stringbuf.cons] constructors:
30    explicit basic_stringbuf(ios_base::openmode which = ios_base::in | ios_base::out); // before C++20
31    basic_stringbuf() : basic_stringbuf(ios_base::in | ios_base::out) {}               // C++20
32    explicit basic_stringbuf(ios_base::openmode which);                                // C++20
33    explicit basic_stringbuf(const basic_string<char_type, traits_type, allocator_type>& s,
34                             ios_base::openmode which = ios_base::in | ios_base::out);
35    explicit basic_stringbuf(const allocator_type& a)
36        : basic_stringbuf(ios_base::in | ios_base::out, a) {}                          // C++20
37    basic_stringbuf(ios_base::openmode which, const allocator_type& a);                // C++20
38    explicit basic_stringbuf(basic_string<char_type, traits_type, allocator_type>&& s,
39                             ios_base::openmode which = ios_base::in | ios_base::out); // C++20
40    template <class SAlloc>
41    basic_stringbuf(const basic_string<char_type, traits_type, SAlloc>& s, const allocator_type& a)
42        : basic_stringbuf(s, ios_base::in | ios_base::out, a) {}                       // C++20
43    template <class SAlloc>
44    basic_stringbuf(const basic_string<char_type, traits_type, SAlloc>& s,
45                    ios_base::openmode which, const allocator_type& a);                // C++20
46    template <class SAlloc>
47    explicit basic_stringbuf(const basic_string<char_type, traits_type, SAlloc>& s,
48                             ios_base::openmode which = ios_base::in | ios_base::out); // C++20
49    basic_stringbuf(basic_stringbuf&& rhs);
50    basic_stringbuf(basic_stringbuf&& rhs, const allocator_type& a);                   // C++20
51
52    // [stringbuf.assign] Assign and swap:
53    basic_stringbuf& operator=(basic_stringbuf&& rhs);
54    void swap(basic_stringbuf& rhs) noexcept(see below);                               // conditionally noexcept since C++20
55
56    // [stringbuf.members] Member functions:
57    allocator_type get_allocator() const noexcept;                                     // C++20
58    basic_string<char_type, traits_type, allocator_type> str() const;                  // before C++20
59    basic_string<char_type, traits_type, allocator_type> str() const &;                // C++20
60    template <class SAlloc>
61    basic_string<char_type, traits_type, SAlloc> str(const SAlloc& sa) const;          // C++20
62    basic_string<char_type, traits_type, allocator_type> str() &&;                     // C++20
63    basic_string_view<char_type, traits_type> view() const noexcept;                   // C++20
64    void str(const basic_string<char_type, traits_type, allocator_type>& s);
65    template <class SAlloc>
66    void str(const basic_string<char_type, traits_type, SAlloc>& s);                   // C++20
67    void str(basic_string<char_type, traits_type, allocator_type>&& s);                // C++20
68
69protected:
70    // [stringbuf.virtuals] Overridden virtual functions:
71    virtual int_type underflow();
72    virtual int_type pbackfail(int_type c = traits_type::eof());
73    virtual int_type overflow (int_type c = traits_type::eof());
74    virtual basic_streambuf<char_type, traits_type>* setbuf(char_type*, streamsize);
75    virtual pos_type seekoff(off_type off, ios_base::seekdir way,
76                             ios_base::openmode which = ios_base::in | ios_base::out);
77    virtual pos_type seekpos(pos_type sp,
78                             ios_base::openmode which = ios_base::in | ios_base::out);
79};
80
81// [stringbuf.assign] non member swap
82template <class charT, class traits, class Allocator>
83void swap(basic_stringbuf<charT, traits, Allocator>& x,
84          basic_stringbuf<charT, traits, Allocator>& y); // conditionally noexcept since C++20
85
86typedef basic_stringbuf<char>    stringbuf;
87typedef basic_stringbuf<wchar_t> wstringbuf;
88
89// Class template basic_istringstream [istringstream]
90template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
91class basic_istringstream
92    : public basic_istream<charT, traits>
93{
94public:
95    typedef charT                          char_type;
96    typedef traits                         traits_type;
97    typedef typename traits_type::int_type int_type;
98    typedef typename traits_type::pos_type pos_type;
99    typedef typename traits_type::off_type off_type;
100    typedef Allocator                      allocator_type;
101
102    // [istringstream.cons] Constructors:
103    explicit basic_istringstream(ios_base::openmode which = ios_base::in);             // before C++20
104    basic_istringstream() : basic_istringstream(ios_base::in) {}                       // C++20
105    explicit basic_istringstream(ios_base::openmode which);                            // C++20
106    explicit basic_istringstream(const basic_string<char_type, traits_type, allocator_type>& s,
107                                 ios_base::openmode which = ios_base::in);
108    basic_istringstream(ios_base::openmode which, const allocator_type& a);            // C++20
109    explicit basic_istringstream(basic_string<char_type, traits_type, allocator_type>&& s,
110                                 ios_base::openmode which = ios_base::in);             // C++20
111    template <class SAlloc>
112    basic_istringstream(const basic_string<char_type, traits_type, SAlloc>& s, const allocator_type& a)
113        : basic_istringstream(s, ios_base::in, a) {}                                   // C++20
114    template <class SAlloc>
115    basic_istringstream(const basic_string<char_type, traits_type, SAlloc>& s,
116                        ios_base::openmode which, const allocator_type& a);            // C++20
117    template <class SAlloc>
118    explicit basic_istringstream(const basic_string<char_type, traits_type, SAlloc>& s,
119                                 ios_base::openmode which = ios_base::in);             // C++20
120    basic_istringstream(basic_istringstream&& rhs);
121
122    // [istringstream.assign] Assign and swap:
123    basic_istringstream& operator=(basic_istringstream&& rhs);
124    void swap(basic_istringstream& rhs);
125
126    // [istringstream.members] Member functions:
127    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const;
128    basic_string<char_type, traits_type, allocator_type> str() const;                  // before C++20
129    basic_string<char_type, traits_type, allocator_type> str() const &;                // C++20
130    template <class SAlloc>
131    basic_string<char_type, traits_type, SAlloc> str(const SAlloc& sa) const;          // C++20
132    basic_string<char_type, traits_type, allocator_type> str() &&;                     // C++20
133    basic_string_view<char_type, traits_type> view() const noexcept;                   // C++20
134    void str(const basic_string<char_type, traits_type, allocator_type>& s);
135    template <class SAlloc>
136    void str(const basic_string<char_type, traits_type, SAlloc>& s);                   // C++20
137    void str(basic_string<char_type, traits_type, allocator_type>&& s);                // C++20
138};
139
140template <class charT, class traits, class Allocator>
141void swap(basic_istringstream<charT, traits, Allocator>& x,
142          basic_istringstream<charT, traits, Allocator>& y);
143
144typedef basic_istringstream<char>    istringstream;
145typedef basic_istringstream<wchar_t> wistringstream;
146
147// Class template basic_ostringstream [ostringstream]
148template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
149class basic_ostringstream
150    : public basic_ostream<charT, traits>
151{
152public:
153    // types:
154    typedef charT                          char_type;
155    typedef traits                         traits_type;
156    typedef typename traits_type::int_type int_type;
157    typedef typename traits_type::pos_type pos_type;
158    typedef typename traits_type::off_type off_type;
159    typedef Allocator                      allocator_type;
160
161    // [ostringstream.cons] Constructors:
162    explicit basic_ostringstream(ios_base::openmode which = ios_base::out);            // before C++20
163    basic_ostringstream() : basic_ostringstream(ios_base::out) {}                      // C++20
164    explicit basic_ostringstream(ios_base::openmode which);                            // C++20
165    explicit basic_ostringstream(const basic_string<char_type, traits_type, allocator_type>& s,
166                                 ios_base::openmode which = ios_base::out);
167    basic_ostringstream(ios_base::openmode which, const allocator_type& a);            // C++20
168    explicit basic_ostringstream(basic_string<char_type, traits_type, allocator_type>&& s,
169                                 ios_base::openmode which = ios_base::out);            // C++20
170    template <class SAlloc>
171    basic_ostringstream(const basic_string<char_type, traits_type, SAlloc>& s, const allocator_type& a)
172        : basic_ostringstream(s, ios_base::out, a) {}                                  // C++20
173    template <class SAlloc>
174    basic_ostringstream(const basic_string<char_type, traits_type, SAlloc>& s,
175                        ios_base::openmode which, const allocator_type& a);            // C++20
176    template <class SAlloc>
177    explicit basic_ostringstream(const basic_string<char_type, traits_type, SAlloc>& s,
178                                 ios_base::openmode which = ios_base::out);            // C++20
179    basic_ostringstream(basic_ostringstream&& rhs);
180
181    // [ostringstream.assign] Assign and swap:
182    basic_ostringstream& operator=(basic_ostringstream&& rhs);
183    void swap(basic_ostringstream& rhs);
184
185    // [ostringstream.members] Member functions:
186    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const;
187    basic_string<char_type, traits_type, allocator_type> str() const;                  // before C++20
188    basic_string<char_type, traits_type, allocator_type> str() const &;                // C++20
189    template <class SAlloc>
190    basic_string<char_type, traits_type, SAlloc> str(const SAlloc& sa) const;          // C++20
191    basic_string<char_type, traits_type, allocator_type> str() &&;                     // C++20
192    basic_string_view<char_type, traits_type> view() const noexcept;                   // C++20
193    void str(const basic_string<char_type, traits_type, allocator_type>& s);
194    template <class SAlloc>
195    void str(const basic_string<char_type, traits_type, SAlloc>& s);                   // C++20
196    void str(basic_string<char_type, traits_type, allocator_type>&& s);                // C++20
197};
198
199template <class charT, class traits, class Allocator>
200void swap(basic_ostringstream<charT, traits, Allocator>& x,
201          basic_ostringstream<charT, traits, Allocator>& y);
202
203typedef basic_ostringstream<char>    ostringstream;
204typedef basic_ostringstream<wchar_t> wostringstream;
205
206// Class template basic_stringstream [stringstream]
207template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
208class basic_stringstream
209    : public basic_iostream<charT, traits>
210{
211public:
212    // types:
213    typedef charT                          char_type;
214    typedef traits                         traits_type;
215    typedef typename traits_type::int_type int_type;
216    typedef typename traits_type::pos_type pos_type;
217    typedef typename traits_type::off_type off_type;
218    typedef Allocator                      allocator_type;
219
220    // [stringstream.cons] constructors
221    explicit basic_stringstream(ios_base::openmode which = ios_base::out | ios_base::in); // before C++20
222    basic_stringstream() : basic_stringstream(ios_base::out | ios_base::in) {}            // C++20
223    explicit basic_stringstream(ios_base::openmode which);                                // C++20
224    explicit basic_stringstream(const basic_string<char_type, traits_type, allocator_type>& s,
225                                ios_base::openmode which = ios_base::out | ios_base::in);
226    basic_stringstream(ios_base::openmode which, const allocator_type& a);                // C++20
227    explicit basic_stringstream(basic_string<char_type, traits_type, allocator_type>&& s,
228                                ios_base::openmode which = ios_base::out | ios_base::in); // C++20
229    template <class SAlloc>
230    basic_stringstream(const basic_string<char_type, traits_type, SAlloc>& s, const allocator_type& a)
231        : basic_stringstream(s, ios_base::out | ios_base::in, a) {}                       // C++20
232    template <class SAlloc>
233    basic_stringstream(const basic_string<char_type, traits_type, SAlloc>& s,
234                       ios_base::openmode which, const allocator_type& a);                // C++20
235    template <class SAlloc>
236    explicit basic_stringstream(const basic_string<char_type, traits_type, SAlloc>& s,
237                                ios_base::openmode which = ios_base::out | ios_base::in); // C++20
238    basic_stringstream(basic_stringstream&& rhs);
239
240    // [stringstream.assign] Assign and swap:
241    basic_stringstream& operator=(basic_stringstream&& rhs);
242    void swap(basic_stringstream& rhs);
243
244    // [stringstream.members] Member functions:
245    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const;
246    basic_string<char_type, traits_type, allocator_type> str() const;                     // before C++20
247    basic_string<char_type, traits_type, allocator_type> str() const &;                   // C++20
248    template <class SAlloc>
249    basic_string<char_type, traits_type, SAlloc> str(const SAlloc& sa) const;             // C++20
250    basic_string<char_type, traits_type, allocator_type> str() &&;                        // C++20
251    basic_string_view<char_type, traits_type> view() const noexcept;                      // C++20
252    void str(const basic_string<char_type, traits_type, allocator_type>& s);
253    template <class SAlloc>
254    void str(const basic_string<char_type, traits_type, SAlloc>& s);                      // C++20
255    void str(basic_string<char_type, traits_type, allocator_type>&& s);                   // C++20
256};
257
258template <class charT, class traits, class Allocator>
259void swap(basic_stringstream<charT, traits, Allocator>& x,
260          basic_stringstream<charT, traits, Allocator>& y);
261
262typedef basic_stringstream<char>    stringstream;
263typedef basic_stringstream<wchar_t> wstringstream;
264
265}  // std
266
267*/
268
269#include <__assert> // all public C++ headers provide the assertion handler
270#include <__config>
271#include <__fwd/sstream.h>
272#include <__utility/swap.h>
273#include <istream>
274#include <ostream>
275#include <string>
276#include <version>
277
278#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
279#  pragma GCC system_header
280#endif
281
282_LIBCPP_PUSH_MACROS
283#include <__undef_macros>
284
285
286// TODO(LLVM-19): Remove this once we drop support for Clang 16,
287// which had this bug: https://github.com/llvm/llvm-project/issues/40363
288#ifdef _WIN32
289#define _LIBCPP_HIDE_FROM_ABI_SSTREAM _LIBCPP_ALWAYS_INLINE
290#else
291#define _LIBCPP_HIDE_FROM_ABI_SSTREAM _LIBCPP_HIDE_FROM_ABI
292#endif
293
294_LIBCPP_BEGIN_NAMESPACE_STD
295
296// Class template basic_stringbuf [stringbuf]
297
298template <class _CharT, class _Traits, class _Allocator>
299class _LIBCPP_TEMPLATE_VIS basic_stringbuf
300    : public basic_streambuf<_CharT, _Traits>
301{
302public:
303    typedef _CharT                         char_type;
304    typedef _Traits                        traits_type;
305    typedef typename traits_type::int_type int_type;
306    typedef typename traits_type::pos_type pos_type;
307    typedef typename traits_type::off_type off_type;
308    typedef _Allocator                     allocator_type;
309
310    typedef basic_string<char_type, traits_type, allocator_type> string_type;
311
312private:
313
314    string_type __str_;
315    mutable char_type* __hm_;
316    ios_base::openmode __mode_;
317    _LIBCPP_HIDE_FROM_ABI void __init_buf_ptrs();
318    _LIBCPP_HIDE_FROM_ABI void __move_init(basic_stringbuf&& __rhs);
319
320public:
321    // [stringbuf.cons] constructors:
322    _LIBCPP_INLINE_VISIBILITY
323    basic_stringbuf()
324        : __hm_(nullptr), __mode_(ios_base::in | ios_base::out) {}
325
326    _LIBCPP_INLINE_VISIBILITY
327    explicit basic_stringbuf(ios_base::openmode __wch)
328        : __hm_(nullptr), __mode_(__wch) {}
329
330    _LIBCPP_INLINE_VISIBILITY
331    explicit basic_stringbuf(const string_type& __s,
332                             ios_base::openmode __wch = ios_base::in | ios_base::out)
333        : __str_(__s.get_allocator()), __hm_(nullptr), __mode_(__wch)
334    {
335        str(__s);
336    }
337
338#if _LIBCPP_STD_VER >= 20
339    _LIBCPP_HIDE_FROM_ABI explicit basic_stringbuf(const allocator_type& __a)
340        : basic_stringbuf(ios_base::in | ios_base::out, __a) {}
341
342    _LIBCPP_HIDE_FROM_ABI basic_stringbuf(ios_base::openmode __wch, const allocator_type& __a)
343        : __str_(__a), __hm_(nullptr), __mode_(__wch) {}
344
345    _LIBCPP_HIDE_FROM_ABI explicit basic_stringbuf(string_type&& __s,
346                                                   ios_base::openmode __wch = ios_base::in | ios_base::out)
347        : __str_(std::move(__s)), __hm_(nullptr), __mode_(__wch) {
348        __init_buf_ptrs();
349    }
350
351    template <class _SAlloc>
352    _LIBCPP_HIDE_FROM_ABI
353    basic_stringbuf(const basic_string<char_type, traits_type, _SAlloc>& __s, const allocator_type& __a)
354        : basic_stringbuf(__s, ios_base::in | ios_base::out, __a) {}
355
356    template <class _SAlloc>
357    _LIBCPP_HIDE_FROM_ABI basic_stringbuf(
358        const basic_string<char_type, traits_type, _SAlloc>& __s, ios_base::openmode __wch, const allocator_type& __a)
359        : __str_(__s, __a), __hm_(nullptr), __mode_(__wch) {
360        __init_buf_ptrs();
361    }
362
363    template <class _SAlloc>
364      requires (!is_same_v<_SAlloc, allocator_type>)
365    _LIBCPP_HIDE_FROM_ABI explicit basic_stringbuf(const basic_string<char_type, traits_type, _SAlloc>& __s,
366                                                   ios_base::openmode __wch = ios_base::in | ios_base::out)
367        : __str_(__s), __hm_(nullptr), __mode_(__wch) {
368        __init_buf_ptrs();
369    }
370#endif // _LIBCPP_STD_VER >= 20
371
372    basic_stringbuf(basic_stringbuf&& __rhs) : __mode_(__rhs.__mode_) { __move_init(std::move(__rhs)); }
373
374#if _LIBCPP_STD_VER >= 20
375    _LIBCPP_HIDE_FROM_ABI basic_stringbuf(basic_stringbuf&& __rhs, const allocator_type& __a)
376        : basic_stringbuf(__rhs.__mode_, __a) {
377        __move_init(std::move(__rhs));
378    }
379#endif
380
381    // [stringbuf.assign] Assign and swap:
382    basic_stringbuf& operator=(basic_stringbuf&& __rhs);
383    void swap(basic_stringbuf& __rhs)
384#if _LIBCPP_STD_VER >= 20
385        noexcept(allocator_traits<allocator_type>::propagate_on_container_swap::value ||
386                 allocator_traits<allocator_type>::is_always_equal::value)
387#endif
388        ;
389
390    // [stringbuf.members] Member functions:
391
392#if _LIBCPP_STD_VER >= 20
393    _LIBCPP_HIDE_FROM_ABI allocator_type get_allocator() const noexcept { return __str_.get_allocator(); }
394#endif
395
396#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_BUILDING_LIBRARY)
397    string_type str() const;
398#else
399    _LIBCPP_HIDE_FROM_ABI_SSTREAM string_type str() const & { return str(__str_.get_allocator()); }
400
401    _LIBCPP_HIDE_FROM_ABI_SSTREAM string_type str() && {
402        string_type __result;
403        const basic_string_view<_CharT, _Traits> __view = view();
404        if (!__view.empty()) {
405            auto __pos = __view.data() - __str_.data();
406            __result.assign(std::move(__str_), __pos, __view.size());
407        }
408        __str_.clear();
409        __init_buf_ptrs();
410        return __result;
411    }
412#endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_BUILDING_LIBRARY)
413
414#if _LIBCPP_STD_VER >= 20
415    template <class _SAlloc>
416      requires __is_allocator<_SAlloc>::value
417    _LIBCPP_HIDE_FROM_ABI basic_string<char_type, traits_type, _SAlloc> str(const _SAlloc& __sa) const {
418        return basic_string<_CharT, _Traits, _SAlloc>(view(), __sa);
419    }
420
421    _LIBCPP_HIDE_FROM_ABI basic_string_view<char_type, traits_type> view() const noexcept;
422#endif // _LIBCPP_STD_VER >= 20
423
424    void str(const string_type& __s) {
425        __str_ = __s;
426        __init_buf_ptrs();
427    }
428
429#if _LIBCPP_STD_VER >= 20
430    template <class _SAlloc>
431      requires (!is_same_v<_SAlloc, allocator_type>)
432    _LIBCPP_HIDE_FROM_ABI void str(const basic_string<char_type, traits_type, _SAlloc>& __s) {
433        __str_ = __s;
434        __init_buf_ptrs();
435    }
436
437    _LIBCPP_HIDE_FROM_ABI void str(string_type&& __s) {
438        __str_ = std::move(__s);
439        __init_buf_ptrs();
440    }
441#endif // _LIBCPP_STD_VER >= 20
442
443protected:
444    // [stringbuf.virtuals] Overridden virtual functions:
445    int_type underflow() override;
446    int_type pbackfail(int_type __c = traits_type::eof()) override;
447    int_type overflow (int_type __c = traits_type::eof()) override;
448    pos_type seekoff(off_type __off, ios_base::seekdir __way,
449                     ios_base::openmode __wch = ios_base::in | ios_base::out) override;
450    _LIBCPP_HIDE_FROM_ABI_VIRTUAL
451    pos_type seekpos(pos_type __sp,
452                     ios_base::openmode __wch = ios_base::in | ios_base::out) override {
453        return seekoff(__sp, ios_base::beg, __wch);
454    }
455};
456
457template <class _CharT, class _Traits, class _Allocator>
458_LIBCPP_HIDE_FROM_ABI void basic_stringbuf<_CharT, _Traits, _Allocator>::__move_init(basic_stringbuf&& __rhs) {
459    char_type* __p = const_cast<char_type*>(__rhs.__str_.data());
460    ptrdiff_t __binp = -1;
461    ptrdiff_t __ninp = -1;
462    ptrdiff_t __einp = -1;
463    if (__rhs.eback() != nullptr)
464    {
465        __binp = __rhs.eback() - __p;
466        __ninp = __rhs.gptr() - __p;
467        __einp = __rhs.egptr() - __p;
468    }
469    ptrdiff_t __bout = -1;
470    ptrdiff_t __nout = -1;
471    ptrdiff_t __eout = -1;
472    if (__rhs.pbase() != nullptr)
473    {
474        __bout = __rhs.pbase() - __p;
475        __nout = __rhs.pptr() - __p;
476        __eout = __rhs.epptr() - __p;
477    }
478    ptrdiff_t __hm = __rhs.__hm_ == nullptr ? -1 : __rhs.__hm_ - __p;
479    __str_ = _VSTD::move(__rhs.__str_);
480    __p = const_cast<char_type*>(__str_.data());
481    if (__binp != -1)
482        this->setg(__p + __binp, __p + __ninp, __p + __einp);
483    if (__bout != -1)
484    {
485        this->setp(__p + __bout, __p + __eout);
486        this->__pbump(__nout);
487    }
488    __hm_ = __hm == -1 ? nullptr : __p + __hm;
489    __p = const_cast<char_type*>(__rhs.__str_.data());
490    __rhs.setg(__p, __p, __p);
491    __rhs.setp(__p, __p);
492    __rhs.__hm_ = __p;
493    this->pubimbue(__rhs.getloc());
494}
495
496template <class _CharT, class _Traits, class _Allocator>
497basic_stringbuf<_CharT, _Traits, _Allocator>&
498basic_stringbuf<_CharT, _Traits, _Allocator>::operator=(basic_stringbuf&& __rhs)
499{
500    char_type* __p = const_cast<char_type*>(__rhs.__str_.data());
501    ptrdiff_t __binp = -1;
502    ptrdiff_t __ninp = -1;
503    ptrdiff_t __einp = -1;
504    if (__rhs.eback() != nullptr)
505    {
506        __binp = __rhs.eback() - __p;
507        __ninp = __rhs.gptr() - __p;
508        __einp = __rhs.egptr() - __p;
509    }
510    ptrdiff_t __bout = -1;
511    ptrdiff_t __nout = -1;
512    ptrdiff_t __eout = -1;
513    if (__rhs.pbase() != nullptr)
514    {
515        __bout = __rhs.pbase() - __p;
516        __nout = __rhs.pptr() - __p;
517        __eout = __rhs.epptr() - __p;
518    }
519    ptrdiff_t __hm = __rhs.__hm_ == nullptr ? -1 : __rhs.__hm_ - __p;
520    __str_ = _VSTD::move(__rhs.__str_);
521    __p = const_cast<char_type*>(__str_.data());
522    if (__binp != -1)
523        this->setg(__p + __binp, __p + __ninp, __p + __einp);
524    else
525        this->setg(nullptr, nullptr, nullptr);
526    if (__bout != -1)
527    {
528        this->setp(__p + __bout, __p + __eout);
529        this->__pbump(__nout);
530    }
531    else
532        this->setp(nullptr, nullptr);
533
534    __hm_ = __hm == -1 ? nullptr : __p + __hm;
535    __mode_ = __rhs.__mode_;
536    __p = const_cast<char_type*>(__rhs.__str_.data());
537    __rhs.setg(__p, __p, __p);
538    __rhs.setp(__p, __p);
539    __rhs.__hm_ = __p;
540    this->pubimbue(__rhs.getloc());
541    return *this;
542}
543
544template <class _CharT, class _Traits, class _Allocator>
545void
546basic_stringbuf<_CharT, _Traits, _Allocator>::swap(basic_stringbuf& __rhs)
547#if _LIBCPP_STD_VER >= 20
548    noexcept(allocator_traits<_Allocator>::propagate_on_container_swap::value ||
549             allocator_traits<_Allocator>::is_always_equal::value)
550#endif
551{
552    char_type* __p = const_cast<char_type*>(__rhs.__str_.data());
553    ptrdiff_t __rbinp = -1;
554    ptrdiff_t __rninp = -1;
555    ptrdiff_t __reinp = -1;
556    if (__rhs.eback() != nullptr)
557    {
558        __rbinp = __rhs.eback() - __p;
559        __rninp = __rhs.gptr() - __p;
560        __reinp = __rhs.egptr() - __p;
561    }
562    ptrdiff_t __rbout = -1;
563    ptrdiff_t __rnout = -1;
564    ptrdiff_t __reout = -1;
565    if (__rhs.pbase() != nullptr)
566    {
567        __rbout = __rhs.pbase() - __p;
568        __rnout = __rhs.pptr() - __p;
569        __reout = __rhs.epptr() - __p;
570    }
571    ptrdiff_t __rhm = __rhs.__hm_ == nullptr ? -1 : __rhs.__hm_ - __p;
572    __p = const_cast<char_type*>(__str_.data());
573    ptrdiff_t __lbinp = -1;
574    ptrdiff_t __lninp = -1;
575    ptrdiff_t __leinp = -1;
576    if (this->eback() != nullptr)
577    {
578        __lbinp = this->eback() - __p;
579        __lninp = this->gptr() - __p;
580        __leinp = this->egptr() - __p;
581    }
582    ptrdiff_t __lbout = -1;
583    ptrdiff_t __lnout = -1;
584    ptrdiff_t __leout = -1;
585    if (this->pbase() != nullptr)
586    {
587        __lbout = this->pbase() - __p;
588        __lnout = this->pptr() - __p;
589        __leout = this->epptr() - __p;
590    }
591    ptrdiff_t __lhm = __hm_ == nullptr ? -1 : __hm_ - __p;
592    _VSTD::swap(__mode_, __rhs.__mode_);
593    __str_.swap(__rhs.__str_);
594    __p = const_cast<char_type*>(__str_.data());
595    if (__rbinp != -1)
596        this->setg(__p + __rbinp, __p + __rninp, __p + __reinp);
597    else
598        this->setg(nullptr, nullptr, nullptr);
599    if (__rbout != -1)
600    {
601        this->setp(__p + __rbout, __p + __reout);
602        this->__pbump(__rnout);
603    }
604    else
605        this->setp(nullptr, nullptr);
606    __hm_ = __rhm == -1 ? nullptr : __p + __rhm;
607    __p = const_cast<char_type*>(__rhs.__str_.data());
608    if (__lbinp != -1)
609        __rhs.setg(__p + __lbinp, __p + __lninp, __p + __leinp);
610    else
611        __rhs.setg(nullptr, nullptr, nullptr);
612    if (__lbout != -1)
613    {
614        __rhs.setp(__p + __lbout, __p + __leout);
615        __rhs.__pbump(__lnout);
616    }
617    else
618        __rhs.setp(nullptr, nullptr);
619    __rhs.__hm_ = __lhm == -1 ? nullptr : __p + __lhm;
620    locale __tl = __rhs.getloc();
621    __rhs.pubimbue(this->getloc());
622    this->pubimbue(__tl);
623}
624
625template <class _CharT, class _Traits, class _Allocator>
626inline _LIBCPP_INLINE_VISIBILITY
627void
628swap(basic_stringbuf<_CharT, _Traits, _Allocator>& __x,
629     basic_stringbuf<_CharT, _Traits, _Allocator>& __y)
630#if _LIBCPP_STD_VER >= 20
631    noexcept(noexcept(__x.swap(__y)))
632#endif
633{
634    __x.swap(__y);
635}
636
637#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_BUILDING_LIBRARY)
638template <class _CharT, class _Traits, class _Allocator>
639basic_string<_CharT, _Traits, _Allocator>
640basic_stringbuf<_CharT, _Traits, _Allocator>::str() const {
641    if (__mode_ & ios_base::out) {
642        if (__hm_ < this->pptr())
643            __hm_ = this->pptr();
644        return string_type(this->pbase(), __hm_, __str_.get_allocator());
645    } else if (__mode_ & ios_base::in)
646        return string_type(this->eback(), this->egptr(), __str_.get_allocator());
647    return string_type(__str_.get_allocator());
648}
649#endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_BUILDING_LIBRARY)
650
651template <class _CharT, class _Traits, class _Allocator>
652_LIBCPP_HIDE_FROM_ABI void basic_stringbuf<_CharT, _Traits, _Allocator>::__init_buf_ptrs() {
653    __hm_ = nullptr;
654    char_type* __data = const_cast<char_type*>(__str_.data());
655    typename string_type::size_type __sz = __str_.size();
656    if (__mode_ & ios_base::in) {
657        __hm_ = __data + __sz;
658        this->setg(__data, __data, __hm_);
659    }
660    if (__mode_ & ios_base::out) {
661        __hm_ = __data + __sz;
662        __str_.resize(__str_.capacity());
663        this->setp(__data, __data + __str_.size());
664        if (__mode_ & (ios_base::app | ios_base::ate)) {
665            while (__sz > INT_MAX) {
666                this->pbump(INT_MAX);
667                __sz -= INT_MAX;
668            }
669            if (__sz > 0)
670                this->pbump(__sz);
671        }
672    }
673}
674
675#if _LIBCPP_STD_VER >= 20
676template <class _CharT, class _Traits, class _Allocator>
677_LIBCPP_HIDE_FROM_ABI basic_string_view<_CharT, _Traits>
678basic_stringbuf<_CharT, _Traits, _Allocator>::view() const noexcept {
679    if (__mode_ & ios_base::out) {
680        if (__hm_ < this->pptr())
681            __hm_ = this->pptr();
682        return basic_string_view<_CharT, _Traits>(this->pbase(), __hm_);
683    } else if (__mode_ & ios_base::in)
684        return basic_string_view<_CharT, _Traits>(this->eback(), this->egptr());
685    return basic_string_view<_CharT, _Traits>();
686}
687#endif // _LIBCPP_STD_VER >= 20
688
689template <class _CharT, class _Traits, class _Allocator>
690typename basic_stringbuf<_CharT, _Traits, _Allocator>::int_type
691basic_stringbuf<_CharT, _Traits, _Allocator>::underflow()
692{
693    if (__hm_ < this->pptr())
694        __hm_ = this->pptr();
695    if (__mode_ & ios_base::in)
696    {
697        if (this->egptr() < __hm_)
698            this->setg(this->eback(), this->gptr(), __hm_);
699        if (this->gptr() < this->egptr())
700            return traits_type::to_int_type(*this->gptr());
701    }
702    return traits_type::eof();
703}
704
705template <class _CharT, class _Traits, class _Allocator>
706typename basic_stringbuf<_CharT, _Traits, _Allocator>::int_type
707basic_stringbuf<_CharT, _Traits, _Allocator>::pbackfail(int_type __c)
708{
709    if (__hm_ < this->pptr())
710        __hm_ = this->pptr();
711    if (this->eback() < this->gptr())
712    {
713        if (traits_type::eq_int_type(__c, traits_type::eof()))
714        {
715            this->setg(this->eback(), this->gptr()-1, __hm_);
716            return traits_type::not_eof(__c);
717        }
718        if ((__mode_ & ios_base::out) ||
719            traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1]))
720        {
721            this->setg(this->eback(), this->gptr()-1, __hm_);
722            *this->gptr() = traits_type::to_char_type(__c);
723            return __c;
724        }
725    }
726    return traits_type::eof();
727}
728
729template <class _CharT, class _Traits, class _Allocator>
730typename basic_stringbuf<_CharT, _Traits, _Allocator>::int_type
731basic_stringbuf<_CharT, _Traits, _Allocator>::overflow(int_type __c)
732{
733    if (!traits_type::eq_int_type(__c, traits_type::eof()))
734    {
735        ptrdiff_t __ninp = this->gptr() - this->eback();
736        if (this->pptr() == this->epptr())
737        {
738            if (!(__mode_ & ios_base::out))
739                return traits_type::eof();
740#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
741            try
742            {
743#endif // _LIBCPP_HAS_NO_EXCEPTIONS
744                ptrdiff_t __nout = this->pptr() - this->pbase();
745                ptrdiff_t __hm = __hm_ - this->pbase();
746                __str_.push_back(char_type());
747                __str_.resize(__str_.capacity());
748                char_type* __p = const_cast<char_type*>(__str_.data());
749                this->setp(__p, __p + __str_.size());
750                this->__pbump(__nout);
751                __hm_ = this->pbase() + __hm;
752#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
753            }
754            catch (...)
755            {
756                return traits_type::eof();
757            }
758#endif // _LIBCPP_HAS_NO_EXCEPTIONS
759        }
760        __hm_ = _VSTD::max(this->pptr() + 1, __hm_);
761        if (__mode_ & ios_base::in)
762        {
763            char_type* __p = const_cast<char_type*>(__str_.data());
764            this->setg(__p, __p + __ninp, __hm_);
765        }
766        return this->sputc(traits_type::to_char_type(__c));
767    }
768    return traits_type::not_eof(__c);
769}
770
771template <class _CharT, class _Traits, class _Allocator>
772typename basic_stringbuf<_CharT, _Traits, _Allocator>::pos_type
773basic_stringbuf<_CharT, _Traits, _Allocator>::seekoff(off_type __off,
774                                                      ios_base::seekdir __way,
775                                                      ios_base::openmode __wch)
776{
777    if (__hm_ < this->pptr())
778        __hm_ = this->pptr();
779    if ((__wch & (ios_base::in | ios_base::out)) == 0)
780        return pos_type(-1);
781    if ((__wch & (ios_base::in | ios_base::out)) == (ios_base::in | ios_base::out)
782        && __way == ios_base::cur)
783        return pos_type(-1);
784    const ptrdiff_t __hm = __hm_ == nullptr ? 0 : __hm_ - __str_.data();
785    off_type __noff;
786    switch (__way)
787    {
788    case ios_base::beg:
789        __noff = 0;
790        break;
791    case ios_base::cur:
792        if (__wch & ios_base::in)
793            __noff = this->gptr() - this->eback();
794        else
795            __noff = this->pptr() - this->pbase();
796        break;
797    case ios_base::end:
798        __noff = __hm;
799        break;
800    default:
801        return pos_type(-1);
802    }
803    __noff += __off;
804    if (__noff < 0 || __hm < __noff)
805        return pos_type(-1);
806    if (__noff != 0)
807    {
808        if ((__wch & ios_base::in) && this->gptr() == nullptr)
809            return pos_type(-1);
810        if ((__wch & ios_base::out) && this->pptr() == nullptr)
811            return pos_type(-1);
812    }
813    if (__wch & ios_base::in)
814        this->setg(this->eback(), this->eback() + __noff, __hm_);
815    if (__wch & ios_base::out)
816    {
817        this->setp(this->pbase(), this->epptr());
818        this->__pbump(__noff);
819    }
820    return pos_type(__noff);
821}
822
823// Class template basic_istringstream [istringstream]
824
825template <class _CharT, class _Traits, class _Allocator>
826class _LIBCPP_TEMPLATE_VIS basic_istringstream
827    : public basic_istream<_CharT, _Traits>
828{
829public:
830    typedef _CharT                         char_type;
831    typedef _Traits                        traits_type;
832    typedef typename traits_type::int_type int_type;
833    typedef typename traits_type::pos_type pos_type;
834    typedef typename traits_type::off_type off_type;
835    typedef _Allocator                     allocator_type;
836
837    typedef basic_string<char_type, traits_type, allocator_type> string_type;
838
839private:
840    basic_stringbuf<char_type, traits_type, allocator_type> __sb_;
841
842public:
843    // [istringstream.cons] Constructors:
844    _LIBCPP_INLINE_VISIBILITY
845    basic_istringstream()
846        : basic_istream<_CharT, _Traits>(&__sb_), __sb_(ios_base::in) {}
847
848    _LIBCPP_INLINE_VISIBILITY
849    explicit basic_istringstream(ios_base::openmode __wch)
850        : basic_istream<_CharT, _Traits>(&__sb_), __sb_(__wch | ios_base::in) {}
851
852    _LIBCPP_INLINE_VISIBILITY
853    explicit basic_istringstream(const string_type& __s,
854                                 ios_base::openmode __wch = ios_base::in)
855        : basic_istream<_CharT, _Traits>(&__sb_)
856        , __sb_(__s, __wch | ios_base::in)
857    { }
858
859#if _LIBCPP_STD_VER >= 20
860    _LIBCPP_HIDE_FROM_ABI basic_istringstream(ios_base::openmode __wch, const _Allocator& __a)
861        : basic_istream<_CharT, _Traits>(std::addressof(__sb_)), __sb_(__wch | ios_base::in, __a) {}
862
863    _LIBCPP_HIDE_FROM_ABI explicit basic_istringstream(string_type&& __s, ios_base::openmode __wch = ios_base::in)
864        : basic_istream<_CharT, _Traits>(std::addressof(__sb_)), __sb_(std::move(__s), __wch | ios_base::in) {}
865
866    template <class _SAlloc>
867    _LIBCPP_HIDE_FROM_ABI basic_istringstream(const basic_string<_CharT, _Traits, _SAlloc>& __s, const _Allocator& __a)
868        : basic_istringstream(__s, ios_base::in, __a) {}
869
870    template <class _SAlloc>
871    _LIBCPP_HIDE_FROM_ABI basic_istringstream(
872        const basic_string<_CharT, _Traits, _SAlloc>& __s, ios_base::openmode __wch, const _Allocator& __a)
873        : basic_istream<_CharT, _Traits>(std::addressof(__sb_)), __sb_(__s, __wch | ios_base::in, __a) {}
874
875    template <class _SAlloc>
876    _LIBCPP_HIDE_FROM_ABI explicit basic_istringstream(const basic_string<_CharT, _Traits, _SAlloc>& __s,
877                                                       ios_base::openmode __wch = ios_base::in)
878        : basic_istream<_CharT, _Traits>(std::addressof(__sb_)), __sb_(__s, __wch | ios_base::in) {}
879#endif // _LIBCPP_STD_VER >= 20
880
881    _LIBCPP_INLINE_VISIBILITY
882    basic_istringstream(basic_istringstream&& __rhs)
883        : basic_istream<_CharT, _Traits>(_VSTD::move(__rhs))
884        , __sb_(_VSTD::move(__rhs.__sb_))
885    {
886        basic_istream<_CharT, _Traits>::set_rdbuf(&__sb_);
887    }
888
889    // [istringstream.assign] Assign and swap:
890    basic_istringstream& operator=(basic_istringstream&& __rhs) {
891        basic_istream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
892        __sb_ = _VSTD::move(__rhs.__sb_);
893        return *this;
894    }
895    _LIBCPP_INLINE_VISIBILITY
896    void swap(basic_istringstream& __rhs) {
897        basic_istream<char_type, traits_type>::swap(__rhs);
898        __sb_.swap(__rhs.__sb_);
899    }
900
901    // [istringstream.members] Member functions:
902    _LIBCPP_INLINE_VISIBILITY
903    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const {
904        return const_cast<basic_stringbuf<char_type, traits_type, allocator_type>*>(&__sb_);
905    }
906
907#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_BUILDING_LIBRARY)
908    _LIBCPP_HIDE_FROM_ABI string_type str() const { return __sb_.str(); }
909#else
910    _LIBCPP_HIDE_FROM_ABI_SSTREAM string_type str() const & { return __sb_.str(); }
911
912    _LIBCPP_HIDE_FROM_ABI_SSTREAM string_type str() && { return std::move(__sb_).str(); }
913#endif
914
915#if _LIBCPP_STD_VER >= 20
916    template <class _SAlloc>
917      requires __is_allocator<_SAlloc>::value
918    _LIBCPP_HIDE_FROM_ABI basic_string<char_type, traits_type, _SAlloc> str(const _SAlloc& __sa) const {
919        return __sb_.str(__sa);
920    }
921
922    _LIBCPP_HIDE_FROM_ABI basic_string_view<char_type, traits_type> view() const noexcept { return __sb_.view(); }
923#endif // _LIBCPP_STD_VER >= 20
924
925    _LIBCPP_HIDE_FROM_ABI void str(const string_type& __s) { __sb_.str(__s); }
926
927#if _LIBCPP_STD_VER >= 20
928    template <class _SAlloc>
929    _LIBCPP_HIDE_FROM_ABI void str(const basic_string<char_type, traits_type, _SAlloc>& __s) {
930        __sb_.str(__s);
931    }
932
933    _LIBCPP_HIDE_FROM_ABI void str(string_type&& __s) { __sb_.str(std::move(__s)); }
934#endif // _LIBCPP_STD_VER >= 20
935};
936
937template <class _CharT, class _Traits, class _Allocator>
938inline _LIBCPP_INLINE_VISIBILITY
939void
940swap(basic_istringstream<_CharT, _Traits, _Allocator>& __x,
941     basic_istringstream<_CharT, _Traits, _Allocator>& __y)
942{
943    __x.swap(__y);
944}
945
946// Class template basic_ostringstream [ostringstream]
947
948template <class _CharT, class _Traits, class _Allocator>
949class _LIBCPP_TEMPLATE_VIS basic_ostringstream
950    : public basic_ostream<_CharT, _Traits>
951{
952public:
953    typedef _CharT                         char_type;
954    typedef _Traits                        traits_type;
955    typedef typename traits_type::int_type int_type;
956    typedef typename traits_type::pos_type pos_type;
957    typedef typename traits_type::off_type off_type;
958    typedef _Allocator                     allocator_type;
959
960    typedef basic_string<char_type, traits_type, allocator_type> string_type;
961
962private:
963    basic_stringbuf<char_type, traits_type, allocator_type> __sb_;
964
965public:
966    // [ostringstream.cons] Constructors:
967    _LIBCPP_INLINE_VISIBILITY
968    basic_ostringstream()
969        : basic_ostream<_CharT, _Traits>(&__sb_), __sb_(ios_base::out) {}
970
971    _LIBCPP_INLINE_VISIBILITY
972    explicit basic_ostringstream(ios_base::openmode __wch)
973        : basic_ostream<_CharT, _Traits>(&__sb_), __sb_(__wch | ios_base::out) {}
974
975    _LIBCPP_INLINE_VISIBILITY
976    explicit basic_ostringstream(const string_type& __s,
977                                 ios_base::openmode __wch = ios_base::out)
978        : basic_ostream<_CharT, _Traits>(&__sb_)
979        , __sb_(__s, __wch | ios_base::out)
980    { }
981
982#if _LIBCPP_STD_VER >= 20
983    _LIBCPP_HIDE_FROM_ABI basic_ostringstream(ios_base::openmode __wch, const _Allocator& __a)
984        : basic_ostream<_CharT, _Traits>(std::addressof(__sb_)), __sb_(__wch | ios_base::out, __a) {}
985
986    _LIBCPP_HIDE_FROM_ABI explicit basic_ostringstream(string_type&& __s, ios_base::openmode __wch = ios_base::out)
987        : basic_ostream<_CharT, _Traits>(std::addressof(__sb_)), __sb_(std::move(__s), __wch | ios_base::out) {}
988
989    template <class _SAlloc>
990    _LIBCPP_HIDE_FROM_ABI basic_ostringstream(const basic_string<_CharT, _Traits, _SAlloc>& __s, const _Allocator& __a)
991        : basic_ostringstream(__s, ios_base::out, __a) {}
992
993    template <class _SAlloc>
994    _LIBCPP_HIDE_FROM_ABI basic_ostringstream(
995        const basic_string<_CharT, _Traits, _SAlloc>& __s, ios_base::openmode __wch, const _Allocator& __a)
996        : basic_ostream<_CharT, _Traits>(std::addressof(__sb_)), __sb_(__s, __wch | ios_base::out, __a) {}
997
998    template <class _SAlloc>
999      requires (!is_same_v<_SAlloc, allocator_type>)
1000    _LIBCPP_HIDE_FROM_ABI explicit basic_ostringstream(const basic_string<_CharT, _Traits, _SAlloc>& __s,
1001                                                       ios_base::openmode __wch = ios_base::out)
1002        : basic_ostream<_CharT, _Traits>(std::addressof(__sb_)), __sb_(__s, __wch | ios_base::out) {}
1003#endif // _LIBCPP_STD_VER >= 20
1004
1005    _LIBCPP_INLINE_VISIBILITY
1006    basic_ostringstream(basic_ostringstream&& __rhs)
1007        : basic_ostream<_CharT, _Traits>(_VSTD::move(__rhs))
1008        , __sb_(_VSTD::move(__rhs.__sb_))
1009    {
1010        basic_ostream<_CharT, _Traits>::set_rdbuf(&__sb_);
1011    }
1012
1013    // [ostringstream.assign] Assign and swap:
1014    basic_ostringstream& operator=(basic_ostringstream&& __rhs) {
1015        basic_ostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1016        __sb_ = _VSTD::move(__rhs.__sb_);
1017        return *this;
1018    }
1019
1020    _LIBCPP_INLINE_VISIBILITY
1021    void swap(basic_ostringstream& __rhs) {
1022        basic_ostream<char_type, traits_type>::swap(__rhs);
1023        __sb_.swap(__rhs.__sb_);
1024    }
1025
1026    // [ostringstream.members] Member functions:
1027    _LIBCPP_INLINE_VISIBILITY
1028    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const {
1029        return const_cast<basic_stringbuf<char_type, traits_type, allocator_type>*>(&__sb_);
1030    }
1031
1032#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_BUILDING_LIBRARY)
1033    _LIBCPP_HIDE_FROM_ABI string_type str() const { return __sb_.str(); }
1034#else
1035    _LIBCPP_HIDE_FROM_ABI_SSTREAM string_type str() const & { return __sb_.str(); }
1036
1037    _LIBCPP_HIDE_FROM_ABI_SSTREAM string_type str() && { return std::move(__sb_).str(); }
1038#endif
1039
1040#if _LIBCPP_STD_VER >= 20
1041    template <class _SAlloc>
1042      requires __is_allocator<_SAlloc>::value
1043    _LIBCPP_HIDE_FROM_ABI basic_string<char_type, traits_type, _SAlloc> str(const _SAlloc& __sa) const {
1044        return __sb_.str(__sa);
1045    }
1046
1047    _LIBCPP_HIDE_FROM_ABI basic_string_view<char_type, traits_type> view() const noexcept { return __sb_.view(); }
1048#endif // _LIBCPP_STD_VER >= 20
1049
1050    _LIBCPP_HIDE_FROM_ABI void str(const string_type& __s) { __sb_.str(__s); }
1051
1052#if _LIBCPP_STD_VER >= 20
1053    template <class _SAlloc>
1054    _LIBCPP_HIDE_FROM_ABI void str(const basic_string<char_type, traits_type, _SAlloc>& __s) {
1055        __sb_.str(__s);
1056    }
1057
1058    _LIBCPP_HIDE_FROM_ABI void str(string_type&& __s) { __sb_.str(std::move(__s)); }
1059#endif // _LIBCPP_STD_VER >= 20
1060};
1061
1062template <class _CharT, class _Traits, class _Allocator>
1063inline _LIBCPP_INLINE_VISIBILITY
1064void
1065swap(basic_ostringstream<_CharT, _Traits, _Allocator>& __x,
1066     basic_ostringstream<_CharT, _Traits, _Allocator>& __y)
1067{
1068    __x.swap(__y);
1069}
1070
1071// Class template basic_stringstream [stringstream]
1072
1073template <class _CharT, class _Traits, class _Allocator>
1074class _LIBCPP_TEMPLATE_VIS basic_stringstream
1075    : public basic_iostream<_CharT, _Traits>
1076{
1077public:
1078    typedef _CharT                         char_type;
1079    typedef _Traits                        traits_type;
1080    typedef typename traits_type::int_type int_type;
1081    typedef typename traits_type::pos_type pos_type;
1082    typedef typename traits_type::off_type off_type;
1083    typedef _Allocator                     allocator_type;
1084
1085    typedef basic_string<char_type, traits_type, allocator_type> string_type;
1086
1087private:
1088    basic_stringbuf<char_type, traits_type, allocator_type> __sb_;
1089
1090public:
1091    // [stringstream.cons] constructors
1092    _LIBCPP_INLINE_VISIBILITY
1093    basic_stringstream()
1094        : basic_iostream<_CharT, _Traits>(&__sb_), __sb_(ios_base::in | ios_base::out) {}
1095
1096    _LIBCPP_INLINE_VISIBILITY
1097    explicit basic_stringstream(ios_base::openmode __wch)
1098        : basic_iostream<_CharT, _Traits>(&__sb_), __sb_(__wch) {}
1099
1100    _LIBCPP_INLINE_VISIBILITY
1101    explicit basic_stringstream(const string_type& __s,
1102                                ios_base::openmode __wch = ios_base::in | ios_base::out)
1103        : basic_iostream<_CharT, _Traits>(&__sb_)
1104        , __sb_(__s, __wch)
1105    { }
1106
1107#if _LIBCPP_STD_VER >= 20
1108    _LIBCPP_HIDE_FROM_ABI basic_stringstream(ios_base::openmode __wch, const _Allocator& __a)
1109        : basic_iostream<_CharT, _Traits>(std::addressof(__sb_)), __sb_(__wch, __a) {}
1110
1111    _LIBCPP_HIDE_FROM_ABI explicit basic_stringstream(string_type&& __s, ios_base::openmode __wch = ios_base::out | ios_base::in)
1112        : basic_iostream<_CharT, _Traits>(std::addressof(__sb_)), __sb_(std::move(__s), __wch) {}
1113
1114    template <class _SAlloc>
1115    _LIBCPP_HIDE_FROM_ABI basic_stringstream(const basic_string<_CharT, _Traits, _SAlloc>& __s, const _Allocator& __a)
1116        : basic_stringstream(__s, ios_base::out | ios_base::in, __a) {}
1117
1118    template <class _SAlloc>
1119    _LIBCPP_HIDE_FROM_ABI basic_stringstream(
1120        const basic_string<_CharT, _Traits, _SAlloc>& __s, ios_base::openmode __wch, const _Allocator& __a)
1121        : basic_iostream<_CharT, _Traits>(std::addressof(__sb_)), __sb_(__s, __wch, __a) {}
1122
1123    template <class _SAlloc>
1124      requires (!is_same_v<_SAlloc, allocator_type>)
1125    _LIBCPP_HIDE_FROM_ABI explicit basic_stringstream(const basic_string<_CharT, _Traits, _SAlloc>& __s,
1126                                                      ios_base::openmode __wch = ios_base::out | ios_base::in)
1127        : basic_iostream<_CharT, _Traits>(std::addressof(__sb_)), __sb_(__s, __wch) {}
1128#endif // _LIBCPP_STD_VER >= 20
1129
1130    _LIBCPP_INLINE_VISIBILITY
1131    basic_stringstream(basic_stringstream&& __rhs)
1132        : basic_iostream<_CharT, _Traits>(_VSTD::move(__rhs))
1133        , __sb_(_VSTD::move(__rhs.__sb_))
1134    {
1135        basic_istream<_CharT, _Traits>::set_rdbuf(&__sb_);
1136    }
1137
1138    // [stringstream.assign] Assign and swap:
1139    basic_stringstream& operator=(basic_stringstream&& __rhs) {
1140        basic_iostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
1141        __sb_ = _VSTD::move(__rhs.__sb_);
1142        return *this;
1143    }
1144    _LIBCPP_INLINE_VISIBILITY
1145    void swap(basic_stringstream& __rhs) {
1146        basic_iostream<char_type, traits_type>::swap(__rhs);
1147        __sb_.swap(__rhs.__sb_);
1148    }
1149
1150    // [stringstream.members] Member functions:
1151    _LIBCPP_INLINE_VISIBILITY
1152    basic_stringbuf<char_type, traits_type, allocator_type>* rdbuf() const {
1153        return const_cast<basic_stringbuf<char_type, traits_type, allocator_type>*>(&__sb_);
1154    }
1155
1156#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_BUILDING_LIBRARY)
1157    _LIBCPP_HIDE_FROM_ABI string_type str() const { return __sb_.str(); }
1158#else
1159    _LIBCPP_HIDE_FROM_ABI_SSTREAM string_type str() const & { return __sb_.str(); }
1160
1161    _LIBCPP_HIDE_FROM_ABI_SSTREAM string_type str() && { return std::move(__sb_).str(); }
1162#endif
1163
1164#if _LIBCPP_STD_VER >= 20
1165    template <class _SAlloc>
1166      requires __is_allocator<_SAlloc>::value
1167    _LIBCPP_HIDE_FROM_ABI basic_string<char_type, traits_type, _SAlloc> str(const _SAlloc& __sa) const {
1168        return __sb_.str(__sa);
1169    }
1170
1171    _LIBCPP_HIDE_FROM_ABI basic_string_view<char_type, traits_type> view() const noexcept { return __sb_.view(); }
1172#endif // _LIBCPP_STD_VER >= 20
1173
1174    _LIBCPP_HIDE_FROM_ABI void str(const string_type& __s) { __sb_.str(__s); }
1175
1176#if _LIBCPP_STD_VER >= 20
1177    template <class _SAlloc>
1178    _LIBCPP_HIDE_FROM_ABI void str(const basic_string<char_type, traits_type, _SAlloc>& __s) {
1179        __sb_.str(__s);
1180    }
1181
1182    _LIBCPP_HIDE_FROM_ABI void str(string_type&& __s) { __sb_.str(std::move(__s)); }
1183#endif // _LIBCPP_STD_VER >= 20
1184};
1185
1186template <class _CharT, class _Traits, class _Allocator>
1187inline _LIBCPP_INLINE_VISIBILITY
1188void
1189swap(basic_stringstream<_CharT, _Traits, _Allocator>& __x,
1190     basic_stringstream<_CharT, _Traits, _Allocator>& __y)
1191{
1192    __x.swap(__y);
1193}
1194
1195#if defined(_LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1)
1196extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_stringbuf<char>;
1197extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_stringstream<char>;
1198extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ostringstream<char>;
1199extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_istringstream<char>;
1200#endif
1201
1202_LIBCPP_END_NAMESPACE_STD
1203
1204_LIBCPP_POP_MACROS
1205
1206#if _LIBCPP_STD_VER <= 20 && !defined(_LIPCPP_REMOVE_TRANSITIVE_INCLUDES)
1207#  include <type_traits>
1208#endif
1209
1210#endif // _LIBCPP_SSTREAM
1211