1// String based streams -*- C++ -*-
2
3// Copyright (C) 1997-2017 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library. This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 3, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14// GNU General Public License for more details.
15
16// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23// <http://www.gnu.org/licenses/>.
24
25/** @file include/sstream
26 * This is a Standard C++ Library header.
27 */
28
29//
30// ISO C++ 14882: 27.7 String-based streams
31//
32
33#ifndef _GLIBCXX_SSTREAM
34#define _GLIBCXX_SSTREAM 1
35
36#pragma GCC system_header
37
38#include <istream>
39#include <ostream>
40
41namespace std _GLIBCXX_VISIBILITY(default)
42{
43_GLIBCXX_BEGIN_NAMESPACE_VERSION
44_GLIBCXX_BEGIN_NAMESPACE_CXX11
45
46 // [27.7.1] template class basic_stringbuf
47 /**
48 * @brief The actual work of input and output (for std::string).
49 * @ingroup io
50 *
51 * @tparam _CharT Type of character stream.
52 * @tparam _Traits Traits for character type, defaults to
53 * char_traits<_CharT>.
54 * @tparam _Alloc Allocator type, defaults to allocator<_CharT>.
55 *
56 * This class associates either or both of its input and output sequences
57 * with a sequence of characters, which can be initialized from, or made
58 * available as, a @c std::basic_string. (Paraphrased from [27.7.1]/1.)
59 *
60 * For this class, open modes (of type @c ios_base::openmode) have
61 * @c in set if the input sequence can be read, and @c out set if the
62 * output sequence can be written.
63 */
64 template<typename _CharT, typename _Traits, typename _Alloc>
65 class basic_stringbuf : public basic_streambuf<_CharT, _Traits>
66 {
67 struct __xfer_bufptrs;
68 public:
69 // Types:
70 typedef _CharT char_type;
71 typedef _Traits traits_type;
72 // _GLIBCXX_RESOLVE_LIB_DEFECTS
73 // 251. basic_stringbuf missing allocator_type
74 typedef _Alloc allocator_type;
75 typedef typename traits_type::int_type int_type;
76 typedef typename traits_type::pos_type pos_type;
77 typedef typename traits_type::off_type off_type;
78
79 typedef basic_streambuf<char_type, traits_type> __streambuf_type;
80 typedef basic_string<char_type, _Traits, _Alloc> __string_type;
81 typedef typename __string_type::size_type __size_type;
82
83 protected:
84 /// Place to stash in || out || in | out settings for current stringbuf.
85 ios_base::openmode _M_mode;
86
87 // Data Members:
88 __string_type _M_string;
89
90 public:
91 // Constructors:
92 /**
93 * @brief Starts with an empty string buffer.
94 * @param __mode Whether the buffer can read, or write, or both.
95 *
96 * The default constructor initializes the parent class using its
97 * own default ctor.
98 */
99 explicit
100 basic_stringbuf(ios_base::openmode __mode = ios_base::in | ios_base::out)
101 : __streambuf_type(), _M_mode(__mode), _M_string()
102 { }
103
104 /**
105 * @brief Starts with an existing string buffer.
106 * @param __str A string to copy as a starting buffer.
107 * @param __mode Whether the buffer can read, or write, or both.
108 *
109 * This constructor initializes the parent class using its
110 * own default ctor.
111 */
112 explicit
113 basic_stringbuf(const __string_type& __str,
114 ios_base::openmode __mode = ios_base::in | ios_base::out)
115 : __streambuf_type(), _M_mode(), _M_string(__str.data(), __str.size())
116 { _M_stringbuf_init(__mode); }
117
118#if __cplusplus >= 201103L
119 basic_stringbuf(const basic_stringbuf&) = delete;
120
121 basic_stringbuf(basic_stringbuf&& __rhs)
122 : basic_stringbuf(std::move(__rhs), __xfer_bufptrs(__rhs, this))
123 { __rhs._M_sync(const_cast<char_type*>(__rhs._M_string.data()), 0, 0); }
124
125 // 27.8.2.2 Assign and swap:
126
127 basic_stringbuf&
128 operator=(const basic_stringbuf&) = delete;
129
130 basic_stringbuf&
131 operator=(basic_stringbuf&& __rhs)
132 {
133 __xfer_bufptrs __st{__rhs, this};
134 const __streambuf_type& __base = __rhs;
135 __streambuf_type::operator=(__base);
136 this->pubimbue(__rhs.getloc());
137 _M_mode = __rhs._M_mode;
138 _M_string = std::move(__rhs._M_string);
139 __rhs._M_sync(const_cast<char_type*>(__rhs._M_string.data()), 0, 0);
140 return *this;
141 }
142
143 void
144 swap(basic_stringbuf& __rhs)
145 {
146 __xfer_bufptrs __l_st{*this, std::__addressof(__rhs)};
147 __xfer_bufptrs __r_st{__rhs, this};
148 __streambuf_type& __base = __rhs;
149 __streambuf_type::swap(__base);
150 __rhs.pubimbue(this->pubimbue(__rhs.getloc()));
151 std::swap(_M_mode, __rhs._M_mode);
152 std::swap(_M_string, __rhs._M_string);
153 }
154#endif
155
156 // Get and set:
157 /**
158 * @brief Copying out the string buffer.
159 * @return A copy of one of the underlying sequences.
160 *
161 * <em>If the buffer is only created in input mode, the underlying
162 * character sequence is equal to the input sequence; otherwise, it
163 * is equal to the output sequence.</em> [27.7.1.2]/1
164 */
165 __string_type
166 str() const
167 {
168 __string_type __ret;
169 if (this->pptr())
170 {
171 // The current egptr() may not be the actual string end.
172 if (this->pptr() > this->egptr())
173 __ret = __string_type(this->pbase(), this->pptr());
174 else
175 __ret = __string_type(this->pbase(), this->egptr());
176 }
177 else
178 __ret = _M_string;
179 return __ret;
180 }
181
182 /**
183 * @brief Setting a new buffer.
184 * @param __s The string to use as a new sequence.
185 *
186 * Deallocates any previous stored sequence, then copies @a s to
187 * use as a new one.
188 */
189 void
190 str(const __string_type& __s)
191 {
192 // Cannot use _M_string = __s, since v3 strings are COW
193 // (not always true now but assign() always works).
194 _M_string.assign(__s.data(), __s.size());
195 _M_stringbuf_init(_M_mode);
196 }
197
198 protected:
199 // Common initialization code goes here.
200 void
201 _M_stringbuf_init(ios_base::openmode __mode)
202 {
203 _M_mode = __mode;
204 __size_type __len = 0;
205 if (_M_mode & (ios_base::ate | ios_base::app))
206 __len = _M_string.size();
207 _M_sync(const_cast<char_type*>(_M_string.data()), 0, __len);
208 }
209
210 virtual streamsize
211 showmanyc()
212 {
213 streamsize __ret = -1;
214 if (_M_mode & ios_base::in)
215 {
216 _M_update_egptr();
217 __ret = this->egptr() - this->gptr();
218 }
219 return __ret;
220 }
221
222 virtual int_type
223 underflow();
224
225 virtual int_type
226 pbackfail(int_type __c = traits_type::eof());
227
228 virtual int_type
229 overflow(int_type __c = traits_type::eof());
230
231 /**
232 * @brief Manipulates the buffer.
233 * @param __s Pointer to a buffer area.
234 * @param __n Size of @a __s.
235 * @return @c this
236 *
237 * If no buffer has already been created, and both @a __s and @a __n are
238 * non-zero, then @c __s is used as a buffer; see
239 * https://gcc.gnu.org/onlinedocs/libstdc++/manual/streambufs.html#io.streambuf.buffering
240 * for more.
241 */
242 virtual __streambuf_type*
243 setbuf(char_type* __s, streamsize __n)
244 {
245 if (__s && __n >= 0)
246 {
247 // This is implementation-defined behavior, and assumes
248 // that an external char_type array of length __n exists
249 // and has been pre-allocated. If this is not the case,
250 // things will quickly blow up.
251
252 // Step 1: Destroy the current internal array.
253 _M_string.clear();
254
255 // Step 2: Use the external array.
256 _M_sync(__s, __n, 0);
257 }
258 return this;
259 }
260
261 virtual pos_type
262 seekoff(off_type __off, ios_base::seekdir __way,
263 ios_base::openmode __mode = ios_base::in | ios_base::out);
264
265 virtual pos_type
266 seekpos(pos_type __sp,
267 ios_base::openmode __mode = ios_base::in | ios_base::out);
268
269 // Internal function for correctly updating the internal buffer
270 // for a particular _M_string, due to initialization or re-sizing
271 // of an existing _M_string.
272 void
273 _M_sync(char_type* __base, __size_type __i, __size_type __o);
274
275 // Internal function for correctly updating egptr() to the actual
276 // string end.
277 void
278 _M_update_egptr()
279 {
280 const bool __testin = _M_mode & ios_base::in;
281 if (this->pptr() && this->pptr() > this->egptr())
282 {
283 if (__testin)
284 this->setg(this->eback(), this->gptr(), this->pptr());
285 else
286 this->setg(this->pptr(), this->pptr(), this->pptr());
287 }
288 }
289
290 // Works around the issue with pbump, part of the protected
291 // interface of basic_streambuf, taking just an int.
292 void
293 _M_pbump(char_type* __pbeg, char_type* __pend, off_type __off);
294
295 private:
296#if __cplusplus >= 201103L
297#if _GLIBCXX_USE_CXX11_ABI
298 // This type captures the state of the gptr / pptr pointers as offsets
299 // so they can be restored in another object after moving the string.
300 struct __xfer_bufptrs
301 {
302 __xfer_bufptrs(const basic_stringbuf& __from, basic_stringbuf* __to)
303 : _M_to{__to}, _M_goff{-1, -1, -1}, _M_poff{-1, -1, -1}
304 {
305 const _CharT* const __str = __from._M_string.data();
306 const _CharT* __end = nullptr;
307 if (__from.eback())
308 {
309 _M_goff[0] = __from.eback() - __str;
310 _M_goff[1] = __from.gptr() - __str;
311 _M_goff[2] = __from.egptr() - __str;
312 __end = __from.egptr();
313 }
314 if (__from.pbase())
315 {
316 _M_poff[0] = __from.pbase() - __str;
317 _M_poff[1] = __from.pptr() - __from.pbase();
318 _M_poff[2] = __from.epptr() - __str;
319 if (__from.pptr() > __end)
320 __end = __from.pptr();
321 }
322
323 // Set _M_string length to the greater of the get and put areas.
324 if (__end)
325 {
326 // The const_cast avoids changing this constructor's signature,
327 // because it is exported from the dynamic library.
328 auto& __mut_from = const_cast<basic_stringbuf&>(__from);
329 __mut_from._M_string._M_length(__end - __str);
330 }
331 }
332
333 ~__xfer_bufptrs()
334 {
335 char_type* __str = const_cast<char_type*>(_M_to->_M_string.data());
336 if (_M_goff[0] != -1)
337 _M_to->setg(__str+_M_goff[0], __str+_M_goff[1], __str+_M_goff[2]);
338 if (_M_poff[0] != -1)
339 _M_to->_M_pbump(__str+_M_poff[0], __str+_M_poff[2], _M_poff[1]);
340 }
341
342 basic_stringbuf* _M_to;
343 off_type _M_goff[3];
344 off_type _M_poff[3];
345 };
346#else
347 // This type does nothing when using Copy-On-Write strings.
348 struct __xfer_bufptrs
349 {
350 __xfer_bufptrs(const basic_stringbuf&, basic_stringbuf*) { }
351 };
352#endif
353
354 // The move constructor initializes an __xfer_bufptrs temporary then
355 // delegates to this constructor to performs moves during its lifetime.
356 basic_stringbuf(basic_stringbuf&& __rhs, __xfer_bufptrs&&)
357 : __streambuf_type(static_cast<const __streambuf_type&>(__rhs)),
358 _M_mode(__rhs._M_mode), _M_string(std::move(__rhs._M_string))
359 { }
360#endif
361 };
362
363
364 // [27.7.2] Template class basic_istringstream
365 /**
366 * @brief Controlling input for std::string.
367 * @ingroup io
368 *
369 * @tparam _CharT Type of character stream.
370 * @tparam _Traits Traits for character type, defaults to
371 * char_traits<_CharT>.
372 * @tparam _Alloc Allocator type, defaults to allocator<_CharT>.
373 *
374 * This class supports reading from objects of type std::basic_string,
375 * using the inherited functions from std::basic_istream. To control
376 * the associated sequence, an instance of std::basic_stringbuf is used,
377 * which this page refers to as @c sb.
378 */
379 template<typename _CharT, typename _Traits, typename _Alloc>
380 class basic_istringstream : public basic_istream<_CharT, _Traits>
381 {
382 public:
383 // Types:
384 typedef _CharT char_type;
385 typedef _Traits traits_type;
386 // _GLIBCXX_RESOLVE_LIB_DEFECTS
387 // 251. basic_stringbuf missing allocator_type
388 typedef _Alloc allocator_type;
389 typedef typename traits_type::int_type int_type;
390 typedef typename traits_type::pos_type pos_type;
391 typedef typename traits_type::off_type off_type;
392
393 // Non-standard types:
394 typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
395 typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
396 typedef basic_istream<char_type, traits_type> __istream_type;
397
398 private:
399 __stringbuf_type _M_stringbuf;
400
401 public:
402 // Constructors:
403 /**
404 * @brief Default constructor starts with an empty string buffer.
405 * @param __mode Whether the buffer can read, or write, or both.
406 *
407 * @c ios_base::in is automatically included in @a __mode.
408 *
409 * Initializes @c sb using @c __mode|in, and passes @c &sb to the base
410 * class initializer. Does not allocate any buffer.
411 *
412 * That's a lie. We initialize the base class with NULL, because the
413 * string class does its own memory management.
414 */
415 explicit
416 basic_istringstream(ios_base::openmode __mode = ios_base::in)
417 : __istream_type(), _M_stringbuf(__mode | ios_base::in)
418 { this->init(&_M_stringbuf); }
419
420 /**
421 * @brief Starts with an existing string buffer.
422 * @param __str A string to copy as a starting buffer.
423 * @param __mode Whether the buffer can read, or write, or both.
424 *
425 * @c ios_base::in is automatically included in @a mode.
426 *
427 * Initializes @c sb using @a str and @c mode|in, and passes @c &sb
428 * to the base class initializer.
429 *
430 * That's a lie. We initialize the base class with NULL, because the
431 * string class does its own memory management.
432 */
433 explicit
434 basic_istringstream(const __string_type& __str,
435 ios_base::openmode __mode = ios_base::in)
436 : __istream_type(), _M_stringbuf(__str, __mode | ios_base::in)
437 { this->init(&_M_stringbuf); }
438
439 /**
440 * @brief The destructor does nothing.
441 *
442 * The buffer is deallocated by the stringbuf object, not the
443 * formatting stream.
444 */
445 ~basic_istringstream()
446 { }
447
448#if __cplusplus >= 201103L
449 basic_istringstream(const basic_istringstream&) = delete;
450
451 basic_istringstream(basic_istringstream&& __rhs)
452 : __istream_type(std::move(__rhs)),
453 _M_stringbuf(std::move(__rhs._M_stringbuf))
454 { __istream_type::set_rdbuf(&_M_stringbuf); }
455
456 // 27.8.3.2 Assign and swap:
457
458 basic_istringstream&
459 operator=(const basic_istringstream&) = delete;
460
461 basic_istringstream&
462 operator=(basic_istringstream&& __rhs)
463 {
464 __istream_type::operator=(std::move(__rhs));
465 _M_stringbuf = std::move(__rhs._M_stringbuf);
466 return *this;
467 }
468
469 void
470 swap(basic_istringstream& __rhs)
471 {
472 __istream_type::swap(__rhs);
473 _M_stringbuf.swap(__rhs._M_stringbuf);
474 }
475#endif
476
477 // Members:
478 /**
479 * @brief Accessing the underlying buffer.
480 * @return The current basic_stringbuf buffer.
481 *
482 * This hides both signatures of std::basic_ios::rdbuf().
483 */
484 __stringbuf_type*
485 rdbuf() const
486 { return const_cast<__stringbuf_type*>(&_M_stringbuf); }
487
488 /**
489 * @brief Copying out the string buffer.
490 * @return @c rdbuf()->str()
491 */
492 __string_type
493 str() const
494 { return _M_stringbuf.str(); }
495
496 /**
497 * @brief Setting a new buffer.
498 * @param __s The string to use as a new sequence.
499 *
500 * Calls @c rdbuf()->str(s).
501 */
502 void
503 str(const __string_type& __s)
504 { _M_stringbuf.str(__s); }
505 };
506
507
508 // [27.7.3] Template class basic_ostringstream
509 /**
510 * @brief Controlling output for std::string.
511 * @ingroup io
512 *
513 * @tparam _CharT Type of character stream.
514 * @tparam _Traits Traits for character type, defaults to
515 * char_traits<_CharT>.
516 * @tparam _Alloc Allocator type, defaults to allocator<_CharT>.
517 *
518 * This class supports writing to objects of type std::basic_string,
519 * using the inherited functions from std::basic_ostream. To control
520 * the associated sequence, an instance of std::basic_stringbuf is used,
521 * which this page refers to as @c sb.
522 */
523 template <typename _CharT, typename _Traits, typename _Alloc>
524 class basic_ostringstream : public basic_ostream<_CharT, _Traits>
525 {
526 public:
527 // Types:
528 typedef _CharT char_type;
529 typedef _Traits traits_type;
530 // _GLIBCXX_RESOLVE_LIB_DEFECTS
531 // 251. basic_stringbuf missing allocator_type
532 typedef _Alloc allocator_type;
533 typedef typename traits_type::int_type int_type;
534 typedef typename traits_type::pos_type pos_type;
535 typedef typename traits_type::off_type off_type;
536
537 // Non-standard types:
538 typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
539 typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
540 typedef basic_ostream<char_type, traits_type> __ostream_type;
541
542 private:
543 __stringbuf_type _M_stringbuf;
544
545 public:
546 // Constructors/destructor:
547 /**
548 * @brief Default constructor starts with an empty string buffer.
549 * @param __mode Whether the buffer can read, or write, or both.
550 *
551 * @c ios_base::out is automatically included in @a mode.
552 *
553 * Initializes @c sb using @c mode|out, and passes @c &sb to the base
554 * class initializer. Does not allocate any buffer.
555 *
556 * That's a lie. We initialize the base class with NULL, because the
557 * string class does its own memory management.
558 */
559 explicit
560 basic_ostringstream(ios_base::openmode __mode = ios_base::out)
561 : __ostream_type(), _M_stringbuf(__mode | ios_base::out)
562 { this->init(&_M_stringbuf); }
563
564 /**
565 * @brief Starts with an existing string buffer.
566 * @param __str A string to copy as a starting buffer.
567 * @param __mode Whether the buffer can read, or write, or both.
568 *
569 * @c ios_base::out is automatically included in @a mode.
570 *
571 * Initializes @c sb using @a str and @c mode|out, and passes @c &sb
572 * to the base class initializer.
573 *
574 * That's a lie. We initialize the base class with NULL, because the
575 * string class does its own memory management.
576 */
577 explicit
578 basic_ostringstream(const __string_type& __str,
579 ios_base::openmode __mode = ios_base::out)
580 : __ostream_type(), _M_stringbuf(__str, __mode | ios_base::out)
581 { this->init(&_M_stringbuf); }
582
583 /**
584 * @brief The destructor does nothing.
585 *
586 * The buffer is deallocated by the stringbuf object, not the
587 * formatting stream.
588 */
589 ~basic_ostringstream()
590 { }
591
592#if __cplusplus >= 201103L
593 basic_ostringstream(const basic_ostringstream&) = delete;
594
595 basic_ostringstream(basic_ostringstream&& __rhs)
596 : __ostream_type(std::move(__rhs)),
597 _M_stringbuf(std::move(__rhs._M_stringbuf))
598 { __ostream_type::set_rdbuf(&_M_stringbuf); }
599
600 // 27.8.3.2 Assign and swap:
601
602 basic_ostringstream&
603 operator=(const basic_ostringstream&) = delete;
604
605 basic_ostringstream&
606 operator=(basic_ostringstream&& __rhs)
607 {
608 __ostream_type::operator=(std::move(__rhs));
609 _M_stringbuf = std::move(__rhs._M_stringbuf);
610 return *this;
611 }
612
613 void
614 swap(basic_ostringstream& __rhs)
615 {
616 __ostream_type::swap(__rhs);
617 _M_stringbuf.swap(__rhs._M_stringbuf);
618 }
619#endif
620
621 // Members:
622 /**
623 * @brief Accessing the underlying buffer.
624 * @return The current basic_stringbuf buffer.
625 *
626 * This hides both signatures of std::basic_ios::rdbuf().
627 */
628 __stringbuf_type*
629 rdbuf() const
630 { return const_cast<__stringbuf_type*>(&_M_stringbuf); }
631
632 /**
633 * @brief Copying out the string buffer.
634 * @return @c rdbuf()->str()
635 */
636 __string_type
637 str() const
638 { return _M_stringbuf.str(); }
639
640 /**
641 * @brief Setting a new buffer.
642 * @param __s The string to use as a new sequence.
643 *
644 * Calls @c rdbuf()->str(s).
645 */
646 void
647 str(const __string_type& __s)
648 { _M_stringbuf.str(__s); }
649 };
650
651
652 // [27.7.4] Template class basic_stringstream
653 /**
654 * @brief Controlling input and output for std::string.
655 * @ingroup io
656 *
657 * @tparam _CharT Type of character stream.
658 * @tparam _Traits Traits for character type, defaults to
659 * char_traits<_CharT>.
660 * @tparam _Alloc Allocator type, defaults to allocator<_CharT>.
661 *
662 * This class supports reading from and writing to objects of type
663 * std::basic_string, using the inherited functions from
664 * std::basic_iostream. To control the associated sequence, an instance
665 * of std::basic_stringbuf is used, which this page refers to as @c sb.
666 */
667 template <typename _CharT, typename _Traits, typename _Alloc>
668 class basic_stringstream : public basic_iostream<_CharT, _Traits>
669 {
670 public:
671 // Types:
672 typedef _CharT char_type;
673 typedef _Traits traits_type;
674 // _GLIBCXX_RESOLVE_LIB_DEFECTS
675 // 251. basic_stringbuf missing allocator_type
676 typedef _Alloc allocator_type;
677 typedef typename traits_type::int_type int_type;
678 typedef typename traits_type::pos_type pos_type;
679 typedef typename traits_type::off_type off_type;
680
681 // Non-standard Types:
682 typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
683 typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
684 typedef basic_iostream<char_type, traits_type> __iostream_type;
685
686 private:
687 __stringbuf_type _M_stringbuf;
688
689 public:
690 // Constructors/destructors
691 /**
692 * @brief Default constructor starts with an empty string buffer.
693 * @param __m Whether the buffer can read, or write, or both.
694 *
695 * Initializes @c sb using the mode from @c __m, and passes @c
696 * &sb to the base class initializer. Does not allocate any
697 * buffer.
698 *
699 * That's a lie. We initialize the base class with NULL, because the
700 * string class does its own memory management.
701 */
702 explicit
703 basic_stringstream(ios_base::openmode __m = ios_base::out | ios_base::in)
704 : __iostream_type(), _M_stringbuf(__m)
705 { this->init(&_M_stringbuf); }
706
707 /**
708 * @brief Starts with an existing string buffer.
709 * @param __str A string to copy as a starting buffer.
710 * @param __m Whether the buffer can read, or write, or both.
711 *
712 * Initializes @c sb using @a __str and @c __m, and passes @c &sb
713 * to the base class initializer.
714 *
715 * That's a lie. We initialize the base class with NULL, because the
716 * string class does its own memory management.
717 */
718 explicit
719 basic_stringstream(const __string_type& __str,
720 ios_base::openmode __m = ios_base::out | ios_base::in)
721 : __iostream_type(), _M_stringbuf(__str, __m)
722 { this->init(&_M_stringbuf); }
723
724 /**
725 * @brief The destructor does nothing.
726 *
727 * The buffer is deallocated by the stringbuf object, not the
728 * formatting stream.
729 */
730 ~basic_stringstream()
731 { }
732
733#if __cplusplus >= 201103L
734 basic_stringstream(const basic_stringstream&) = delete;
735
736 basic_stringstream(basic_stringstream&& __rhs)
737 : __iostream_type(std::move(__rhs)),
738 _M_stringbuf(std::move(__rhs._M_stringbuf))
739 { __iostream_type::set_rdbuf(&_M_stringbuf); }
740
741 // 27.8.3.2 Assign and swap:
742
743 basic_stringstream&
744 operator=(const basic_stringstream&) = delete;
745
746 basic_stringstream&
747 operator=(basic_stringstream&& __rhs)
748 {
749 __iostream_type::operator=(std::move(__rhs));
750 _M_stringbuf = std::move(__rhs._M_stringbuf);
751 return *this;
752 }
753
754 void
755 swap(basic_stringstream& __rhs)
756 {
757 __iostream_type::swap(__rhs);
758 _M_stringbuf.swap(__rhs._M_stringbuf);
759 }
760#endif
761
762 // Members:
763 /**
764 * @brief Accessing the underlying buffer.
765 * @return The current basic_stringbuf buffer.
766 *
767 * This hides both signatures of std::basic_ios::rdbuf().
768 */
769 __stringbuf_type*
770 rdbuf() const
771 { return const_cast<__stringbuf_type*>(&_M_stringbuf); }
772
773 /**
774 * @brief Copying out the string buffer.
775 * @return @c rdbuf()->str()
776 */
777 __string_type
778 str() const
779 { return _M_stringbuf.str(); }
780
781 /**
782 * @brief Setting a new buffer.
783 * @param __s The string to use as a new sequence.
784 *
785 * Calls @c rdbuf()->str(s).
786 */
787 void
788 str(const __string_type& __s)
789 { _M_stringbuf.str(__s); }
790 };
791
792#if __cplusplus >= 201103L
793 /// Swap specialization for stringbufs.
794 template <class _CharT, class _Traits, class _Allocator>
795 inline void
796 swap(basic_stringbuf<_CharT, _Traits, _Allocator>& __x,
797 basic_stringbuf<_CharT, _Traits, _Allocator>& __y)
798 { __x.swap(__y); }
799
800 /// Swap specialization for istringstreams.
801 template <class _CharT, class _Traits, class _Allocator>
802 inline void
803 swap(basic_istringstream<_CharT, _Traits, _Allocator>& __x,
804 basic_istringstream<_CharT, _Traits, _Allocator>& __y)
805 { __x.swap(__y); }
806
807 /// Swap specialization for ostringstreams.
808 template <class _CharT, class _Traits, class _Allocator>
809 inline void
810 swap(basic_ostringstream<_CharT, _Traits, _Allocator>& __x,
811 basic_ostringstream<_CharT, _Traits, _Allocator>& __y)
812 { __x.swap(__y); }
813
814 /// Swap specialization for stringstreams.
815 template <class _CharT, class _Traits, class _Allocator>
816 inline void
817 swap(basic_stringstream<_CharT, _Traits, _Allocator>& __x,
818 basic_stringstream<_CharT, _Traits, _Allocator>& __y)
819 { __x.swap(__y); }
820#endif
821
822_GLIBCXX_END_NAMESPACE_CXX11
823_GLIBCXX_END_NAMESPACE_VERSION
824} // namespace
825
826#include <bits/sstream.tcc>
827
828#endif /* _GLIBCXX_SSTREAM */
829