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ada: Fix alignment violation for chain of aligned and misaligned composite types
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1// Components for manipulating sequences of characters -*- C++ -*-
2
3// Copyright (C) 1997-2025 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 bits/basic_string.tcc
26 * This is an internal header file, included by other library headers.
27 * Do not attempt to use it directly. @headername{string}
28 */
29
30//
31// ISO C++ 14882: 21 Strings library
32//
33
34// Written by Jason Merrill based upon the specification by Takanori Adachi
35// in ANSI X3J16/94-0013R2. Rewritten by Nathan Myers to ISO-14882.
36// Non-reference-counted implementation written by Paolo Carlini and
37// updated by Jonathan Wakely for ISO-14882-2011.
38
39#ifndef _BASIC_STRING_TCC
40#define _BASIC_STRING_TCC 1
41
42#ifdef _GLIBCXX_SYSHDR
43#pragma GCC system_header
44#endif
45
46#pragma GCC diagnostic push
47#pragma GCC diagnostic ignored "-Wc++11-extensions"
48
49#include <bits/cxxabi_forced.h>
50
51namespace std _GLIBCXX_VISIBILITY(default)
52{
53_GLIBCXX_BEGIN_NAMESPACE_VERSION
54
55#if _GLIBCXX_USE_CXX11_ABI
56
57 template<typename _CharT, typename _Traits, typename _Alloc>
58 const typename basic_string<_CharT, _Traits, _Alloc>::size_type
59 basic_string<_CharT, _Traits, _Alloc>::npos;
60
61 template<typename _CharT, typename _Traits, typename _Alloc>
62 _GLIBCXX20_CONSTEXPR
63 void
64 basic_string<_CharT, _Traits, _Alloc>::
65 swap(basic_string& __s) _GLIBCXX_NOEXCEPT
66 {
67 if (this == std::__addressof(__s))
68 return;
69
70 _Alloc_traits::_S_on_swap(_M_get_allocator(), __s._M_get_allocator());
71
72 if (_M_is_local())
73 if (__s._M_is_local())
74 {
75 if (length() && __s.length())
76 {
77 _CharT __tmp_data[_S_local_capacity + 1];
78 traits_type::copy(__tmp_data, __s._M_local_buf,
79 __s.length() + 1);
80 traits_type::copy(__s._M_local_buf, _M_local_buf,
81 length() + 1);
82 traits_type::copy(_M_local_buf, __tmp_data,
83 __s.length() + 1);
84 }
85 else if (__s.length())
86 {
87 _M_init_local_buf();
88 traits_type::copy(_M_local_buf, __s._M_local_buf,
89 __s.length() + 1);
90 _M_length(__s.length());
91 __s._M_set_length(0);
92 return;
93 }
94 else if (length())
95 {
96 __s._M_init_local_buf();
97 traits_type::copy(__s._M_local_buf, _M_local_buf,
98 length() + 1);
99 __s._M_length(length());
100 _M_set_length(0);
101 return;
102 }
103 }
104 else
105 {
106 const size_type __tmp_capacity = __s._M_allocated_capacity;
107 __s._M_init_local_buf();
108 traits_type::copy(__s._M_local_buf, _M_local_buf,
109 length() + 1);
110 _M_data(__s._M_data());
111 __s._M_data(__s._M_local_buf);
112 _M_capacity(__tmp_capacity);
113 }
114 else
115 {
116 const size_type __tmp_capacity = _M_allocated_capacity;
117 if (__s._M_is_local())
118 {
119 _M_init_local_buf();
120 traits_type::copy(_M_local_buf, __s._M_local_buf,
121 __s.length() + 1);
122 __s._M_data(_M_data());
123 _M_data(_M_local_buf);
124 }
125 else
126 {
127 pointer __tmp_ptr = _M_data();
128 _M_data(__s._M_data());
129 __s._M_data(__tmp_ptr);
130 _M_capacity(__s._M_allocated_capacity);
131 }
132 __s._M_capacity(__tmp_capacity);
133 }
134
135 const size_type __tmp_length = length();
136 _M_length(__s.length());
137 __s._M_length(__tmp_length);
138 }
139
140 template<typename _CharT, typename _Traits, typename _Alloc>
141 _GLIBCXX20_CONSTEXPR
142 typename basic_string<_CharT, _Traits, _Alloc>::pointer
143 basic_string<_CharT, _Traits, _Alloc>::
144 _M_create(size_type& __capacity, size_type __old_capacity)
145 {
146 // _GLIBCXX_RESOLVE_LIB_DEFECTS
147 // 83. String::npos vs. string::max_size()
148 if (__capacity > max_size())
149 std::__throw_length_error(__N("basic_string::_M_create"));
150
151 // The below implements an exponential growth policy, necessary to
152 // meet amortized linear time requirements of the library: see
153 // http://gcc.gnu.org/ml/libstdc++/2001-07/msg00085.html.
154 if (__capacity > __old_capacity && __capacity < 2 * __old_capacity)
155 {
156 __capacity = 2 * __old_capacity;
157 // Never allocate a string bigger than max_size.
158 if (__capacity > max_size())
159 __capacity = max_size();
160 }
161
162 // NB: Need an array of char_type[__capacity], plus a terminating
163 // null char_type() element.
164 return _S_allocate(_M_get_allocator(), __capacity + 1);
165 }
166
167 // NB: This is the special case for Input Iterators, used in
168 // istreambuf_iterators, etc.
169 // Input Iterators have a cost structure very different from
170 // pointers, calling for a different coding style.
171 template<typename _CharT, typename _Traits, typename _Alloc>
172 template<typename _InIterator>
173 _GLIBCXX20_CONSTEXPR
174 void
175 basic_string<_CharT, _Traits, _Alloc>::
176 _M_construct(_InIterator __beg, _InIterator __end,
177 std::input_iterator_tag)
178 {
179 size_type __len = 0;
180 size_type __capacity = size_type(_S_local_capacity);
181
182 _M_init_local_buf();
183
184 while (__beg != __end && __len < __capacity)
185 {
186 _M_local_buf[__len++] = *__beg;
187 ++__beg;
188 }
189
190 struct _Guard
191 {
192 _GLIBCXX20_CONSTEXPR
193 explicit _Guard(basic_string* __s) : _M_guarded(__s) { }
194
195 _GLIBCXX20_CONSTEXPR
196 ~_Guard() { if (_M_guarded) _M_guarded->_M_dispose(); }
197
198 basic_string* _M_guarded;
199 } __guard(this);
200
201 while (__beg != __end)
202 {
203 if (__len == __capacity)
204 {
205 // Allocate more space.
206 __capacity = __len + 1;
207 pointer __another = _M_create(__capacity, __len);
208 this->_S_copy(__another, _M_data(), __len);
209 _M_dispose();
210 _M_data(__another);
211 _M_capacity(__capacity);
212 }
213 traits_type::assign(_M_data()[__len++],
214 static_cast<_CharT>(*__beg));
215 ++__beg;
216 }
217
218 __guard._M_guarded = 0;
219
220 _M_set_length(__len);
221 }
222
223 template<typename _CharT, typename _Traits, typename _Alloc>
224 template<typename _InIterator>
225 _GLIBCXX20_CONSTEXPR
226 void
227 basic_string<_CharT, _Traits, _Alloc>::
228 _M_construct(_InIterator __beg, _InIterator __end,
229 std::forward_iterator_tag)
230 {
231 size_type __dnew = static_cast<size_type>(std::distance(__beg, __end));
232
233 if (__dnew > size_type(_S_local_capacity))
234 {
235 _M_data(_M_create(__dnew, size_type(0)));
236 _M_capacity(__dnew);
237 }
238 else
239 _M_init_local_buf();
240
241 // Check for out_of_range and length_error exceptions.
242 struct _Guard
243 {
244 _GLIBCXX20_CONSTEXPR
245 explicit _Guard(basic_string* __s) : _M_guarded(__s) { }
246
247 _GLIBCXX20_CONSTEXPR
248 ~_Guard() { if (_M_guarded) _M_guarded->_M_dispose(); }
249
250 basic_string* _M_guarded;
251 } __guard(this);
252
253 this->_S_copy_chars(_M_data(), __beg, __end);
254
255 __guard._M_guarded = 0;
256
257 _M_set_length(__dnew);
258 }
259
260 template<typename _CharT, typename _Traits, typename _Alloc>
261 _GLIBCXX20_CONSTEXPR
262 void
263 basic_string<_CharT, _Traits, _Alloc>::
264 _M_construct(size_type __n, _CharT __c)
265 {
266 if (__n > size_type(_S_local_capacity))
267 {
268 _M_data(_M_create(__n, size_type(0)));
269 _M_capacity(__n);
270 }
271 else
272 _M_init_local_buf();
273
274 if (__n)
275 this->_S_assign(_M_data(), __n, __c);
276
277 _M_set_length(__n);
278 }
279
280 // Length of string constructed is easier to propagate inter-procedurally
281 // than difference between iterators.
282 template<typename _CharT, typename _Traits, typename _Alloc>
283 template<bool _Terminated>
284 _GLIBCXX20_CONSTEXPR
285 void
286 basic_string<_CharT, _Traits, _Alloc>::
287 _M_construct(const _CharT* __str, size_type __n)
288 {
289 if (__n > size_type(_S_local_capacity))
290 {
291 _M_data(_M_create(__n, size_type(0)));
292 _M_capacity(__n);
293 }
294 else
295 _M_init_local_buf();
296
297 if (__n || _Terminated)
298 this->_S_copy(_M_data(), __str, __n + _Terminated);
299
300 _M_length(__n);
301 if (!_Terminated)
302 traits_type::assign(_M_data()[__n], _CharT());
303 }
304
305 template<typename _CharT, typename _Traits, typename _Alloc>
306 _GLIBCXX20_CONSTEXPR
307 void
308 basic_string<_CharT, _Traits, _Alloc>::
309 _M_assign(const basic_string& __str)
310 {
311 if (this != std::__addressof(__str))
312 {
313 const size_type __rsize = __str.length();
314 const size_type __capacity = capacity();
315
316 if (__rsize > __capacity)
317 {
318 size_type __new_capacity = __rsize;
319 pointer __tmp = _M_create(__new_capacity, __capacity);
320 _M_dispose();
321 _M_data(__tmp);
322 _M_capacity(__new_capacity);
323 }
324
325 if (__rsize)
326 this->_S_copy(_M_data(), __str._M_data(), __rsize);
327
328 _M_set_length(__rsize);
329 }
330 }
331
332 template<typename _CharT, typename _Traits, typename _Alloc>
333 _GLIBCXX20_CONSTEXPR
334 void
335 basic_string<_CharT, _Traits, _Alloc>::
336 reserve(size_type __res)
337 {
338 const size_type __capacity = capacity();
339 // _GLIBCXX_RESOLVE_LIB_DEFECTS
340 // 2968. Inconsistencies between basic_string reserve and
341 // vector/unordered_map/unordered_set reserve functions
342 // P0966 reserve should not shrink
343 if (__res <= __capacity)
344 return;
345
346 pointer __tmp = _M_create(__res, __capacity);
347 this->_S_copy(__tmp, _M_data(), length() + 1);
348 _M_dispose();
349 _M_data(__tmp);
350 _M_capacity(__res);
351 }
352
353 template<typename _CharT, typename _Traits, typename _Alloc>
354 _GLIBCXX20_CONSTEXPR
355 void
356 basic_string<_CharT, _Traits, _Alloc>::
357 _M_mutate(size_type __pos, size_type __len1, const _CharT* __s,
358 size_type __len2)
359 {
360 const size_type __how_much = length() - __pos - __len1;
361
362 size_type __new_capacity = length() + __len2 - __len1;
363 pointer __r = _M_create(__new_capacity, capacity());
364
365 if (__pos)
366 this->_S_copy(__r, _M_data(), __pos);
367 if (__s && __len2)
368 this->_S_copy(__r + __pos, __s, __len2);
369 if (__how_much)
370 this->_S_copy(__r + __pos + __len2,
371 _M_data() + __pos + __len1, __how_much);
372
373 _M_dispose();
374 _M_data(__r);
375 _M_capacity(__new_capacity);
376 }
377
378 template<typename _CharT, typename _Traits, typename _Alloc>
379 _GLIBCXX20_CONSTEXPR
380 void
381 basic_string<_CharT, _Traits, _Alloc>::
382 _M_erase(size_type __pos, size_type __n)
383 {
384 const size_type __how_much = length() - __pos - __n;
385
386 if (__how_much && __n)
387 this->_S_move(_M_data() + __pos, _M_data() + __pos + __n, __how_much);
388
389 _M_set_length(length() - __n);
390 }
391
392 template<typename _CharT, typename _Traits, typename _Alloc>
393 _GLIBCXX20_CONSTEXPR
394 void
395 basic_string<_CharT, _Traits, _Alloc>::
396 reserve()
397 {
398 if (_M_is_local())
399 return;
400
401 const size_type __length = length();
402 const size_type __capacity = _M_allocated_capacity;
403
404 if (__length <= size_type(_S_local_capacity))
405 {
406 _M_init_local_buf();
407 this->_S_copy(_M_local_buf, _M_data(), __length + 1);
408 _M_destroy(__capacity);
409 _M_data(_M_local_data());
410 }
411#if __cpp_exceptions
412 else if (__length < __capacity)
413 try
414 {
415 pointer __tmp = _S_allocate(_M_get_allocator(), __length + 1);
416 this->_S_copy(__tmp, _M_data(), __length + 1);
417 _M_dispose();
418 _M_data(__tmp);
419 _M_capacity(__length);
420 }
421 catch (const __cxxabiv1::__forced_unwind&)
422 { throw; }
423 catch (...)
424 { /* swallow the exception */ }
425#endif
426 }
427
428 template<typename _CharT, typename _Traits, typename _Alloc>
429 _GLIBCXX20_CONSTEXPR
430 void
431 basic_string<_CharT, _Traits, _Alloc>::
432 resize(size_type __n, _CharT __c)
433 {
434 const size_type __size = this->size();
435 if (__size < __n)
436 this->append(__n - __size, __c);
437 else if (__n < __size)
438 this->_M_set_length(__n);
439 }
440
441 template<typename _CharT, typename _Traits, typename _Alloc>
442 _GLIBCXX20_CONSTEXPR
443 basic_string<_CharT, _Traits, _Alloc>&
444 basic_string<_CharT, _Traits, _Alloc>::
445 _M_append(const _CharT* __s, size_type __n)
446 {
447 const size_type __len = __n + this->size();
448
449 if (__len <= this->capacity())
450 {
451 if (__n)
452 this->_S_copy(this->_M_data() + this->size(), __s, __n);
453 }
454 else
455 this->_M_mutate(this->size(), size_type(0), __s, __n);
456
457 this->_M_set_length(__len);
458 return *this;
459 }
460
461 template<typename _CharT, typename _Traits, typename _Alloc>
462 template<typename _InputIterator>
463 _GLIBCXX20_CONSTEXPR
464 basic_string<_CharT, _Traits, _Alloc>&
465 basic_string<_CharT, _Traits, _Alloc>::
466 _M_replace_dispatch(const_iterator __i1, const_iterator __i2,
467 _InputIterator __k1, _InputIterator __k2,
468 std::__false_type)
469 {
470 // _GLIBCXX_RESOLVE_LIB_DEFECTS
471 // 2788. unintentionally require a default constructible allocator
472 const basic_string __s(__k1, __k2, this->get_allocator());
473 const size_type __n1 = __i2 - __i1;
474 return _M_replace(__i1 - begin(), __n1, __s._M_data(),
475 __s.size());
476 }
477
478 template<typename _CharT, typename _Traits, typename _Alloc>
479 _GLIBCXX20_CONSTEXPR
480 basic_string<_CharT, _Traits, _Alloc>&
481 basic_string<_CharT, _Traits, _Alloc>::
482 _M_replace_aux(size_type __pos1, size_type __n1, size_type __n2,
483 _CharT __c)
484 {
485 _M_check_length(__n1, __n2, "basic_string::_M_replace_aux");
486
487 const size_type __old_size = this->size();
488 const size_type __new_size = __old_size + __n2 - __n1;
489
490 if (__new_size <= this->capacity())
491 {
492 pointer __p = this->_M_data() + __pos1;
493
494 const size_type __how_much = __old_size - __pos1 - __n1;
495 if (__how_much && __n1 != __n2)
496 this->_S_move(__p + __n2, __p + __n1, __how_much);
497 }
498 else
499 this->_M_mutate(__pos1, __n1, 0, __n2);
500
501 if (__n2)
502 this->_S_assign(this->_M_data() + __pos1, __n2, __c);
503
504 this->_M_set_length(__new_size);
505 return *this;
506 }
507
508 template<typename _CharT, typename _Traits, typename _Alloc>
509 __attribute__((__noinline__, __noclone__, __cold__)) void
510 basic_string<_CharT, _Traits, _Alloc>::
511 _M_replace_cold(pointer __p, size_type __len1, const _CharT* __s,
512 const size_type __len2, const size_type __how_much)
513 {
514 // Work in-place.
515 if (__len2 && __len2 <= __len1)
516 this->_S_move(__p, __s, __len2);
517 if (__how_much && __len1 != __len2)
518 this->_S_move(__p + __len2, __p + __len1, __how_much);
519 if (__len2 > __len1)
520 {
521 if (__s + __len2 <= __p + __len1)
522 this->_S_move(__p, __s, __len2);
523 else if (__s >= __p + __len1)
524 {
525 // Hint to middle end that __p and __s overlap
526 // (PR 98465).
527 const size_type __poff = (__s - __p) + (__len2 - __len1);
528 this->_S_copy(__p, __p + __poff, __len2);
529 }
530 else
531 {
532 const size_type __nleft = (__p + __len1) - __s;
533 this->_S_move(__p, __s, __nleft);
534 this->_S_copy(__p + __nleft, __p + __len2, __len2 - __nleft);
535 }
536 }
537 }
538
539 template<typename _CharT, typename _Traits, typename _Alloc>
540 _GLIBCXX20_CONSTEXPR
541 basic_string<_CharT, _Traits, _Alloc>&
542 basic_string<_CharT, _Traits, _Alloc>::
543 _M_replace(size_type __pos, size_type __len1, const _CharT* __s,
544 const size_type __len2)
545 {
546 _M_check_length(__len1, __len2, "basic_string::_M_replace");
547
548 const size_type __old_size = this->size();
549 const size_type __new_size = __old_size + __len2 - __len1;
550
551 if (__new_size <= this->capacity())
552 {
553 pointer __p = this->_M_data() + __pos;
554
555 const size_type __how_much = __old_size - __pos - __len1;
556#if __cpp_lib_is_constant_evaluated
557 if (std::is_constant_evaluated())
558 {
559 auto __newp = _S_allocate(_M_get_allocator(), __new_size);
560 _S_copy(__newp, this->_M_data(), __pos);
561 _S_copy(__newp + __pos, __s, __len2);
562 _S_copy(__newp + __pos + __len2, __p + __len1, __how_much);
563 _S_copy(this->_M_data(), __newp, __new_size);
564 this->_M_get_allocator().deallocate(__newp, __new_size);
565 }
566 else
567#endif
568 if (__builtin_expect(_M_disjunct(__s), true))
569 {
570 if (__how_much && __len1 != __len2)
571 this->_S_move(__p + __len2, __p + __len1, __how_much);
572 if (__len2)
573 this->_S_copy(__p, __s, __len2);
574 }
575 else
576 _M_replace_cold(__p, __len1, __s, __len2, __how_much);
577 }
578 else
579 this->_M_mutate(__pos, __len1, __s, __len2);
580
581 this->_M_set_length(__new_size);
582 return *this;
583 }
584
585 template<typename _CharT, typename _Traits, typename _Alloc>
586 _GLIBCXX20_CONSTEXPR
587 typename basic_string<_CharT, _Traits, _Alloc>::size_type
588 basic_string<_CharT, _Traits, _Alloc>::
589 copy(_CharT* __s, size_type __n, size_type __pos) const
590 {
591 _M_check(__pos, "basic_string::copy");
592 __n = _M_limit(__pos, __n);
593 __glibcxx_requires_string_len(__s, __n);
594 if (__n)
595 _S_copy(__s, _M_data() + __pos, __n);
596 // 21.3.5.7 par 3: do not append null. (good.)
597 return __n;
598 }
599
600#ifdef __glibcxx_string_resize_and_overwrite // C++ >= 23
601 template<typename _CharT, typename _Traits, typename _Alloc>
602 template<typename _Operation>
603 [[__gnu__::__always_inline__]]
604 constexpr void
605 basic_string<_CharT, _Traits, _Alloc>::
606 __resize_and_overwrite(const size_type __n, _Operation __op)
607 { resize_and_overwrite<_Operation&>(__n, __op); }
608#endif
609
610#if __cplusplus >= 201103L
611 template<typename _CharT, typename _Traits, typename _Alloc>
612 template<typename _Operation>
613 _GLIBCXX20_CONSTEXPR void
614 basic_string<_CharT, _Traits, _Alloc>::
615#ifdef __glibcxx_string_resize_and_overwrite // C++ >= 23
616 resize_and_overwrite(const size_type __n, _Operation __op)
617#else
618 __resize_and_overwrite(const size_type __n, _Operation __op)
619#endif
620 {
621 reserve(__n);
622 _CharT* const __p = _M_data();
623#if __cpp_lib_is_constant_evaluated
624 if (std::__is_constant_evaluated() && __n > size())
625 traits_type::assign(__p + size(), __n - size(), _CharT());
626#endif
627 struct _Terminator {
628 _GLIBCXX20_CONSTEXPR ~_Terminator() { _M_this->_M_set_length(_M_r); }
629 basic_string* _M_this;
630 size_type _M_r;
631 };
632 _Terminator __term{this, 0};
633 auto __r = std::move(__op)(__p + 0, __n + 0);
634#ifdef __cpp_lib_concepts
635 static_assert(ranges::__detail::__is_integer_like<decltype(__r)>);
636#else
637 static_assert(__gnu_cxx::__is_integer_nonstrict<decltype(__r)>::__value,
638 "resize_and_overwrite operation must return an integer");
639#endif
640 _GLIBCXX_DEBUG_ASSERT(__r >= 0 && size_type(__r) <= __n);
641 __term._M_r = size_type(__r);
642 if (__term._M_r > __n)
643 __builtin_unreachable();
644 }
645#endif // C++11
646
647#endif // _GLIBCXX_USE_CXX11_ABI
648
649#if __glibcxx_constexpr_string >= 201907L
650# define _GLIBCXX_STRING_CONSTEXPR constexpr
651#else
652# define _GLIBCXX_STRING_CONSTEXPR
653#endif
654 template<typename _CharT, typename _Traits, typename _Alloc>
655 _GLIBCXX_STRING_CONSTEXPR
656 typename basic_string<_CharT, _Traits, _Alloc>::size_type
657 basic_string<_CharT, _Traits, _Alloc>::
658 find(const _CharT* __s, size_type __pos, size_type __n) const
659 _GLIBCXX_NOEXCEPT
660 {
661 __glibcxx_requires_string_len(__s, __n);
662 const size_type __size = this->size();
663
664 if (__n == 0)
665 return __pos <= __size ? __pos : npos;
666 if (__pos >= __size)
667 return npos;
668
669 const _CharT __elem0 = __s[0];
670 const _CharT* const __data = data();
671 const _CharT* __first = __data + __pos;
672 const _CharT* const __last = __data + __size;
673 size_type __len = __size - __pos;
674
675 while (__len >= __n)
676 {
677 // Find the first occurrence of __elem0:
678 __first = traits_type::find(__first, __len - __n + 1, __elem0);
679 if (!__first)
680 return npos;
681 // Compare the full strings from the first occurrence of __elem0.
682 // We already know that __first[0] == __s[0] but compare them again
683 // anyway because __s is probably aligned, which helps memcmp.
684 if (traits_type::compare(__first, __s, __n) == 0)
685 return __first - __data;
686 __len = __last - ++__first;
687 }
688 return npos;
689 }
690
691 template<typename _CharT, typename _Traits, typename _Alloc>
692 _GLIBCXX_STRING_CONSTEXPR
693 typename basic_string<_CharT, _Traits, _Alloc>::size_type
694 basic_string<_CharT, _Traits, _Alloc>::
695 find(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
696 {
697 size_type __ret = npos;
698 const size_type __size = this->size();
699 if (__pos < __size)
700 {
701 const _CharT* __data = _M_data();
702 const size_type __n = __size - __pos;
703 const _CharT* __p = traits_type::find(__data + __pos, __n, __c);
704 if (__p)
705 __ret = __p - __data;
706 }
707 return __ret;
708 }
709
710 template<typename _CharT, typename _Traits, typename _Alloc>
711 _GLIBCXX_STRING_CONSTEXPR
712 typename basic_string<_CharT, _Traits, _Alloc>::size_type
713 basic_string<_CharT, _Traits, _Alloc>::
714 rfind(const _CharT* __s, size_type __pos, size_type __n) const
715 _GLIBCXX_NOEXCEPT
716 {
717 __glibcxx_requires_string_len(__s, __n);
718 const size_type __size = this->size();
719 if (__n <= __size)
720 {
721 __pos = std::min(size_type(__size - __n), __pos);
722 const _CharT* __data = _M_data();
723 do
724 {
725 if (traits_type::compare(__data + __pos, __s, __n) == 0)
726 return __pos;
727 }
728 while (__pos-- > 0);
729 }
730 return npos;
731 }
732
733 template<typename _CharT, typename _Traits, typename _Alloc>
734 _GLIBCXX_STRING_CONSTEXPR
735 typename basic_string<_CharT, _Traits, _Alloc>::size_type
736 basic_string<_CharT, _Traits, _Alloc>::
737 rfind(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
738 {
739 size_type __size = this->size();
740 if (__size)
741 {
742 if (--__size > __pos)
743 __size = __pos;
744 for (++__size; __size-- > 0; )
745 if (traits_type::eq(_M_data()[__size], __c))
746 return __size;
747 }
748 return npos;
749 }
750
751 template<typename _CharT, typename _Traits, typename _Alloc>
752 _GLIBCXX_STRING_CONSTEXPR
753 typename basic_string<_CharT, _Traits, _Alloc>::size_type
754 basic_string<_CharT, _Traits, _Alloc>::
755 find_first_of(const _CharT* __s, size_type __pos, size_type __n) const
756 _GLIBCXX_NOEXCEPT
757 {
758 __glibcxx_requires_string_len(__s, __n);
759 for (; __n && __pos < this->size(); ++__pos)
760 {
761 const _CharT* __p = traits_type::find(__s, __n, _M_data()[__pos]);
762 if (__p)
763 return __pos;
764 }
765 return npos;
766 }
767
768 template<typename _CharT, typename _Traits, typename _Alloc>
769 _GLIBCXX_STRING_CONSTEXPR
770 typename basic_string<_CharT, _Traits, _Alloc>::size_type
771 basic_string<_CharT, _Traits, _Alloc>::
772 find_last_of(const _CharT* __s, size_type __pos, size_type __n) const
773 _GLIBCXX_NOEXCEPT
774 {
775 __glibcxx_requires_string_len(__s, __n);
776 size_type __size = this->size();
777 if (__size && __n)
778 {
779 if (--__size > __pos)
780 __size = __pos;
781 do
782 {
783 if (traits_type::find(__s, __n, _M_data()[__size]))
784 return __size;
785 }
786 while (__size-- != 0);
787 }
788 return npos;
789 }
790
791 template<typename _CharT, typename _Traits, typename _Alloc>
792 _GLIBCXX_STRING_CONSTEXPR
793 typename basic_string<_CharT, _Traits, _Alloc>::size_type
794 basic_string<_CharT, _Traits, _Alloc>::
795 find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const
796 _GLIBCXX_NOEXCEPT
797 {
798 __glibcxx_requires_string_len(__s, __n);
799 for (; __pos < this->size(); ++__pos)
800 if (!traits_type::find(__s, __n, _M_data()[__pos]))
801 return __pos;
802 return npos;
803 }
804
805 template<typename _CharT, typename _Traits, typename _Alloc>
806 _GLIBCXX_STRING_CONSTEXPR
807 typename basic_string<_CharT, _Traits, _Alloc>::size_type
808 basic_string<_CharT, _Traits, _Alloc>::
809 find_first_not_of(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
810 {
811 for (; __pos < this->size(); ++__pos)
812 if (!traits_type::eq(_M_data()[__pos], __c))
813 return __pos;
814 return npos;
815 }
816
817 template<typename _CharT, typename _Traits, typename _Alloc>
818 _GLIBCXX_STRING_CONSTEXPR
819 typename basic_string<_CharT, _Traits, _Alloc>::size_type
820 basic_string<_CharT, _Traits, _Alloc>::
821 find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const
822 _GLIBCXX_NOEXCEPT
823 {
824 __glibcxx_requires_string_len(__s, __n);
825 size_type __size = this->size();
826 if (__size)
827 {
828 if (--__size > __pos)
829 __size = __pos;
830 do
831 {
832 if (!traits_type::find(__s, __n, _M_data()[__size]))
833 return __size;
834 }
835 while (__size--);
836 }
837 return npos;
838 }
839
840 template<typename _CharT, typename _Traits, typename _Alloc>
841 _GLIBCXX_STRING_CONSTEXPR
842 typename basic_string<_CharT, _Traits, _Alloc>::size_type
843 basic_string<_CharT, _Traits, _Alloc>::
844 find_last_not_of(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
845 {
846 size_type __size = this->size();
847 if (__size)
848 {
849 if (--__size > __pos)
850 __size = __pos;
851 do
852 {
853 if (!traits_type::eq(_M_data()[__size], __c))
854 return __size;
855 }
856 while (__size--);
857 }
858 return npos;
859 }
860
861#undef _GLIBCXX_STRING_CONSTEXPR
862
863 // 21.3.7.9 basic_string::getline and operators
864 template<typename _CharT, typename _Traits, typename _Alloc>
865 basic_istream<_CharT, _Traits>&
866 operator>>(basic_istream<_CharT, _Traits>& __in,
867 basic_string<_CharT, _Traits, _Alloc>& __str)
868 {
869 typedef basic_istream<_CharT, _Traits> __istream_type;
870 typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
871 typedef typename __istream_type::ios_base __ios_base;
872 typedef typename __istream_type::int_type __int_type;
873 typedef typename __string_type::size_type __size_type;
874 typedef ctype<_CharT> __ctype_type;
875 typedef typename __ctype_type::ctype_base __ctype_base;
876
877 __size_type __extracted = 0;
878 typename __ios_base::iostate __err = __ios_base::goodbit;
879 typename __istream_type::sentry __cerb(__in, false);
880 if (__cerb)
881 {
882 __try
883 {
884 // Avoid reallocation for common case.
885 __str.erase();
886 _CharT __buf[128];
887 __size_type __len = 0;
888 const streamsize __w = __in.width();
889 const __size_type __n = __w > 0 ? static_cast<__size_type>(__w)
890 : __str.max_size();
891 const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
892 const __int_type __eof = _Traits::eof();
893 __int_type __c = __in.rdbuf()->sgetc();
894
895 while (__extracted < __n
896 && !_Traits::eq_int_type(__c, __eof)
897 && !__ct.is(__ctype_base::space,
898 _Traits::to_char_type(__c)))
899 {
900 if (__len == sizeof(__buf) / sizeof(_CharT))
901 {
902 __str.append(__buf, sizeof(__buf) / sizeof(_CharT));
903 __len = 0;
904 }
905 __buf[__len++] = _Traits::to_char_type(__c);
906 ++__extracted;
907 __c = __in.rdbuf()->snextc();
908 }
909 __str.append(__buf, __len);
910
911 if (__extracted < __n && _Traits::eq_int_type(__c, __eof))
912 __err |= __ios_base::eofbit;
913 __in.width(0);
914 }
915 __catch(__cxxabiv1::__forced_unwind&)
916 {
917 __in._M_setstate(__ios_base::badbit);
918 __throw_exception_again;
919 }
920 __catch(...)
921 {
922 // _GLIBCXX_RESOLVE_LIB_DEFECTS
923 // 91. Description of operator>> and getline() for string<>
924 // might cause endless loop
925 __in._M_setstate(__ios_base::badbit);
926 }
927 }
928 // 211. operator>>(istream&, string&) doesn't set failbit
929 if (!__extracted)
930 __err |= __ios_base::failbit;
931 if (__err)
932 __in.setstate(__err);
933 return __in;
934 }
935
936 template<typename _CharT, typename _Traits, typename _Alloc>
937 basic_istream<_CharT, _Traits>&
938 getline(basic_istream<_CharT, _Traits>& __in,
939 basic_string<_CharT, _Traits, _Alloc>& __str, _CharT __delim)
940 {
941 typedef basic_istream<_CharT, _Traits> __istream_type;
942 typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
943 typedef typename __istream_type::ios_base __ios_base;
944 typedef typename __istream_type::int_type __int_type;
945 typedef typename __string_type::size_type __size_type;
946
947 __size_type __extracted = 0;
948 const __size_type __n = __str.max_size();
949 typename __ios_base::iostate __err = __ios_base::goodbit;
950 typename __istream_type::sentry __cerb(__in, true);
951 if (__cerb)
952 {
953 __try
954 {
955 __str.erase();
956 const __int_type __idelim = _Traits::to_int_type(__delim);
957 const __int_type __eof = _Traits::eof();
958 __int_type __c = __in.rdbuf()->sgetc();
959
960 while (__extracted < __n
961 && !_Traits::eq_int_type(__c, __eof)
962 && !_Traits::eq_int_type(__c, __idelim))
963 {
964 __str += _Traits::to_char_type(__c);
965 ++__extracted;
966 __c = __in.rdbuf()->snextc();
967 }
968
969 if (_Traits::eq_int_type(__c, __eof))
970 __err |= __ios_base::eofbit;
971 else if (_Traits::eq_int_type(__c, __idelim))
972 {
973 ++__extracted;
974 __in.rdbuf()->sbumpc();
975 }
976 else
977 __err |= __ios_base::failbit;
978 }
979 __catch(__cxxabiv1::__forced_unwind&)
980 {
981 __in._M_setstate(__ios_base::badbit);
982 __throw_exception_again;
983 }
984 __catch(...)
985 {
986 // _GLIBCXX_RESOLVE_LIB_DEFECTS
987 // 91. Description of operator>> and getline() for string<>
988 // might cause endless loop
989 __in._M_setstate(__ios_base::badbit);
990 }
991 }
992 if (!__extracted)
993 __err |= __ios_base::failbit;
994 if (__err)
995 __in.setstate(__err);
996 return __in;
997 }
998
999 // Inhibit implicit instantiations for required instantiations,
1000 // which are defined via explicit instantiations elsewhere.
1001#if _GLIBCXX_EXTERN_TEMPLATE
1002 // The explicit instantiation definitions in src/c++11/string-inst.cc and
1003 // src/c++17/string-inst.cc only instantiate the members required for C++17
1004 // and earlier standards (so not C++20's starts_with and ends_with).
1005 // Suppress the explicit instantiation declarations for C++20, so C++20
1006 // code will implicitly instantiate std::string and std::wstring as needed.
1007# if __cplusplus <= 201703L && _GLIBCXX_EXTERN_TEMPLATE > 0
1008 extern template class basic_string<char>;
1009# elif ! _GLIBCXX_USE_CXX11_ABI
1010 // Still need to prevent implicit instantiation of the COW empty rep,
1011 // to ensure the definition in libstdc++.so is unique (PR 86138).
1012 extern template basic_string<char>::size_type
1013 basic_string<char>::_Rep::_S_empty_rep_storage[];
1014# elif _GLIBCXX_EXTERN_TEMPLATE > 0
1015 // Export _M_replace_cold even for C++20.
1016 extern template void
1017 basic_string<char>::_M_replace_cold(char *, size_type, const char*,
1018 const size_type, const size_type);
1019# endif
1020
1021 extern template
1022 basic_istream<char>&
1023 operator>>(basic_istream<char>&, string&);
1024 extern template
1025 basic_ostream<char>&
1026 operator<<(basic_ostream<char>&, const string&);
1027 extern template
1028 basic_istream<char>&
1029 getline(basic_istream<char>&, string&, char);
1030 extern template
1031 basic_istream<char>&
1032 getline(basic_istream<char>&, string&);
1033
1034#ifdef _GLIBCXX_USE_WCHAR_T
1035# if __cplusplus <= 201703L && _GLIBCXX_EXTERN_TEMPLATE > 0
1036 extern template class basic_string<wchar_t>;
1037# elif ! _GLIBCXX_USE_CXX11_ABI
1038 extern template basic_string<wchar_t>::size_type
1039 basic_string<wchar_t>::_Rep::_S_empty_rep_storage[];
1040# elif _GLIBCXX_EXTERN_TEMPLATE > 0
1041 // Export _M_replace_cold even for C++20.
1042 extern template void
1043 basic_string<wchar_t>::_M_replace_cold(wchar_t*, size_type, const wchar_t*,
1044 const size_type, const size_type);
1045# endif
1046
1047 extern template
1048 basic_istream<wchar_t>&
1049 operator>>(basic_istream<wchar_t>&, wstring&);
1050 extern template
1051 basic_ostream<wchar_t>&
1052 operator<<(basic_ostream<wchar_t>&, const wstring&);
1053 extern template
1054 basic_istream<wchar_t>&
1055 getline(basic_istream<wchar_t>&, wstring&, wchar_t);
1056 extern template
1057 basic_istream<wchar_t>&
1058 getline(basic_istream<wchar_t>&, wstring&);
1059#endif // _GLIBCXX_USE_WCHAR_T
1060#endif // _GLIBCXX_EXTERN_TEMPLATE
1061
1062_GLIBCXX_END_NAMESPACE_VERSION
1063} // namespace std
1064
1065#pragma GCC diagnostic pop
1066#endif
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