libstdc++
basic_string.tcc
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1// Components for manipulating sequences of characters -*- C++ -*-
2
3// Copyright (C) 1997-2021 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#pragma GCC system_header
43
44#include <bits/cxxabi_forced.h>
45
46namespace std _GLIBCXX_VISIBILITY(default)
47{
48_GLIBCXX_BEGIN_NAMESPACE_VERSION
49
50#if _GLIBCXX_USE_CXX11_ABI
51
52 template<typename _CharT, typename _Traits, typename _Alloc>
53 const typename basic_string<_CharT, _Traits, _Alloc>::size_type
54 basic_string<_CharT, _Traits, _Alloc>::npos;
55
56 template<typename _CharT, typename _Traits, typename _Alloc>
57 void
58 basic_string<_CharT, _Traits, _Alloc>::
59 swap(basic_string& __s) _GLIBCXX_NOEXCEPT
60 {
61 if (this == &__s)
62 return;
63
64 _Alloc_traits::_S_on_swap(_M_get_allocator(), __s._M_get_allocator());
65
66 if (_M_is_local())
67 if (__s._M_is_local())
68 {
69 if (length() && __s.length())
70 {
71 _CharT __tmp_data[_S_local_capacity + 1];
72 traits_type::copy(__tmp_data, __s._M_local_buf,
73 _S_local_capacity + 1);
74 traits_type::copy(__s._M_local_buf, _M_local_buf,
75 _S_local_capacity + 1);
76 traits_type::copy(_M_local_buf, __tmp_data,
77 _S_local_capacity + 1);
78 }
79 else if (__s.length())
80 {
81 traits_type::copy(_M_local_buf, __s._M_local_buf,
82 _S_local_capacity + 1);
83 _M_length(__s.length());
84 __s._M_set_length(0);
85 return;
86 }
87 else if (length())
88 {
89 traits_type::copy(__s._M_local_buf, _M_local_buf,
90 _S_local_capacity + 1);
91 __s._M_length(length());
92 _M_set_length(0);
93 return;
94 }
95 }
96 else
97 {
98 const size_type __tmp_capacity = __s._M_allocated_capacity;
99 traits_type::copy(__s._M_local_buf, _M_local_buf,
100 _S_local_capacity + 1);
101 _M_data(__s._M_data());
102 __s._M_data(__s._M_local_buf);
103 _M_capacity(__tmp_capacity);
104 }
105 else
106 {
107 const size_type __tmp_capacity = _M_allocated_capacity;
108 if (__s._M_is_local())
109 {
110 traits_type::copy(_M_local_buf, __s._M_local_buf,
111 _S_local_capacity + 1);
112 __s._M_data(_M_data());
113 _M_data(_M_local_buf);
114 }
115 else
116 {
117 pointer __tmp_ptr = _M_data();
118 _M_data(__s._M_data());
119 __s._M_data(__tmp_ptr);
120 _M_capacity(__s._M_allocated_capacity);
121 }
122 __s._M_capacity(__tmp_capacity);
123 }
124
125 const size_type __tmp_length = length();
126 _M_length(__s.length());
127 __s._M_length(__tmp_length);
128 }
129
130 template<typename _CharT, typename _Traits, typename _Alloc>
131 typename basic_string<_CharT, _Traits, _Alloc>::pointer
132 basic_string<_CharT, _Traits, _Alloc>::
133 _M_create(size_type& __capacity, size_type __old_capacity)
134 {
135 // _GLIBCXX_RESOLVE_LIB_DEFECTS
136 // 83. String::npos vs. string::max_size()
137 if (__capacity > max_size())
138 std::__throw_length_error(__N("basic_string::_M_create"));
139
140 // The below implements an exponential growth policy, necessary to
141 // meet amortized linear time requirements of the library: see
142 // http://gcc.gnu.org/ml/libstdc++/2001-07/msg00085.html.
143 if (__capacity > __old_capacity && __capacity < 2 * __old_capacity)
144 {
145 __capacity = 2 * __old_capacity;
146 // Never allocate a string bigger than max_size.
147 if (__capacity > max_size())
148 __capacity = max_size();
149 }
150
151 // NB: Need an array of char_type[__capacity], plus a terminating
152 // null char_type() element.
153 return _Alloc_traits::allocate(_M_get_allocator(), __capacity + 1);
154 }
155
156 // NB: This is the special case for Input Iterators, used in
157 // istreambuf_iterators, etc.
158 // Input Iterators have a cost structure very different from
159 // pointers, calling for a different coding style.
160 template<typename _CharT, typename _Traits, typename _Alloc>
161 template<typename _InIterator>
162 void
163 basic_string<_CharT, _Traits, _Alloc>::
164 _M_construct(_InIterator __beg, _InIterator __end,
165 std::input_iterator_tag)
166 {
167 size_type __len = 0;
168 size_type __capacity = size_type(_S_local_capacity);
169
170 while (__beg != __end && __len < __capacity)
171 {
172 _M_data()[__len++] = *__beg;
173 ++__beg;
174 }
175
176 __try
177 {
178 while (__beg != __end)
179 {
180 if (__len == __capacity)
181 {
182 // Allocate more space.
183 __capacity = __len + 1;
184 pointer __another = _M_create(__capacity, __len);
185 this->_S_copy(__another, _M_data(), __len);
186 _M_dispose();
187 _M_data(__another);
188 _M_capacity(__capacity);
189 }
190 _M_data()[__len++] = *__beg;
191 ++__beg;
192 }
193 }
194 __catch(...)
195 {
196 _M_dispose();
197 __throw_exception_again;
198 }
199
200 _M_set_length(__len);
201 }
202
203 template<typename _CharT, typename _Traits, typename _Alloc>
204 template<typename _InIterator>
205 void
206 basic_string<_CharT, _Traits, _Alloc>::
207 _M_construct(_InIterator __beg, _InIterator __end,
208 std::forward_iterator_tag)
209 {
210 // NB: Not required, but considered best practice.
211 if (__gnu_cxx::__is_null_pointer(__beg) && __beg != __end)
212 std::__throw_logic_error(__N("basic_string::"
213 "_M_construct null not valid"));
214
215 size_type __dnew = static_cast<size_type>(std::distance(__beg, __end));
216
217 if (__dnew > size_type(_S_local_capacity))
218 {
219 _M_data(_M_create(__dnew, size_type(0)));
220 _M_capacity(__dnew);
221 }
222
223 // Check for out_of_range and length_error exceptions.
224 __try
225 { this->_S_copy_chars(_M_data(), __beg, __end); }
226 __catch(...)
227 {
228 _M_dispose();
229 __throw_exception_again;
230 }
231
232 _M_set_length(__dnew);
233 }
234
235 template<typename _CharT, typename _Traits, typename _Alloc>
236 void
237 basic_string<_CharT, _Traits, _Alloc>::
238 _M_construct(size_type __n, _CharT __c)
239 {
240 if (__n > size_type(_S_local_capacity))
241 {
242 _M_data(_M_create(__n, size_type(0)));
243 _M_capacity(__n);
244 }
245
246 if (__n)
247 this->_S_assign(_M_data(), __n, __c);
248
249 _M_set_length(__n);
250 }
251
252 template<typename _CharT, typename _Traits, typename _Alloc>
253 void
254 basic_string<_CharT, _Traits, _Alloc>::
255 _M_assign(const basic_string& __str)
256 {
257 if (this != &__str)
258 {
259 const size_type __rsize = __str.length();
260 const size_type __capacity = capacity();
261
262 if (__rsize > __capacity)
263 {
264 size_type __new_capacity = __rsize;
265 pointer __tmp = _M_create(__new_capacity, __capacity);
266 _M_dispose();
267 _M_data(__tmp);
268 _M_capacity(__new_capacity);
269 }
270
271 if (__rsize)
272 this->_S_copy(_M_data(), __str._M_data(), __rsize);
273
274 _M_set_length(__rsize);
275 }
276 }
277
278 template<typename _CharT, typename _Traits, typename _Alloc>
279 void
280 basic_string<_CharT, _Traits, _Alloc>::
281 reserve(size_type __res)
282 {
283 const size_type __capacity = capacity();
284 // _GLIBCXX_RESOLVE_LIB_DEFECTS
285 // 2968. Inconsistencies between basic_string reserve and
286 // vector/unordered_map/unordered_set reserve functions
287 // P0966 reserve should not shrink
288 if (__res <= __capacity)
289 return;
290
291 pointer __tmp = _M_create(__res, __capacity);
292 this->_S_copy(__tmp, _M_data(), length() + 1);
293 _M_dispose();
294 _M_data(__tmp);
295 _M_capacity(__res);
296 }
297
298 template<typename _CharT, typename _Traits, typename _Alloc>
299 void
300 basic_string<_CharT, _Traits, _Alloc>::
301 _M_mutate(size_type __pos, size_type __len1, const _CharT* __s,
302 size_type __len2)
303 {
304 const size_type __how_much = length() - __pos - __len1;
305
306 size_type __new_capacity = length() + __len2 - __len1;
307 pointer __r = _M_create(__new_capacity, capacity());
308
309 if (__pos)
310 this->_S_copy(__r, _M_data(), __pos);
311 if (__s && __len2)
312 this->_S_copy(__r + __pos, __s, __len2);
313 if (__how_much)
314 this->_S_copy(__r + __pos + __len2,
315 _M_data() + __pos + __len1, __how_much);
316
317 _M_dispose();
318 _M_data(__r);
319 _M_capacity(__new_capacity);
320 }
321
322 template<typename _CharT, typename _Traits, typename _Alloc>
323 void
324 basic_string<_CharT, _Traits, _Alloc>::
325 _M_erase(size_type __pos, size_type __n)
326 {
327 const size_type __how_much = length() - __pos - __n;
328
329 if (__how_much && __n)
330 this->_S_move(_M_data() + __pos, _M_data() + __pos + __n, __how_much);
331
332 _M_set_length(length() - __n);
333 }
334
335 template<typename _CharT, typename _Traits, typename _Alloc>
336 void
337 basic_string<_CharT, _Traits, _Alloc>::
338 reserve()
339 {
340 if (_M_is_local())
341 return;
342
343 const size_type __length = length();
344 const size_type __capacity = _M_allocated_capacity;
345
346 if (__length <= size_type(_S_local_capacity))
347 {
348 this->_S_copy(_M_local_data(), _M_data(), __length + 1);
349 _M_destroy(__capacity);
350 _M_data(_M_local_data());
351 }
352#if __cpp_exceptions
353 else if (__length < __capacity)
354 try
355 {
356 pointer __tmp
357 = _Alloc_traits::allocate(_M_get_allocator(), __length + 1);
358 this->_S_copy(__tmp, _M_data(), __length + 1);
359 _M_dispose();
360 _M_data(__tmp);
361 _M_capacity(__length);
362 }
363 catch (const __cxxabiv1::__forced_unwind&)
364 { throw; }
365 catch (...)
366 { /* swallow the exception */ }
367#endif
368 }
369
370 template<typename _CharT, typename _Traits, typename _Alloc>
371 void
372 basic_string<_CharT, _Traits, _Alloc>::
373 resize(size_type __n, _CharT __c)
374 {
375 const size_type __size = this->size();
376 if (__size < __n)
377 this->append(__n - __size, __c);
378 else if (__n < __size)
379 this->_M_set_length(__n);
380 }
381
382 template<typename _CharT, typename _Traits, typename _Alloc>
383 basic_string<_CharT, _Traits, _Alloc>&
384 basic_string<_CharT, _Traits, _Alloc>::
385 _M_append(const _CharT* __s, size_type __n)
386 {
387 const size_type __len = __n + this->size();
388
389 if (__len <= this->capacity())
390 {
391 if (__n)
392 this->_S_copy(this->_M_data() + this->size(), __s, __n);
393 }
394 else
395 this->_M_mutate(this->size(), size_type(0), __s, __n);
396
397 this->_M_set_length(__len);
398 return *this;
399 }
400
401 template<typename _CharT, typename _Traits, typename _Alloc>
402 template<typename _InputIterator>
403 basic_string<_CharT, _Traits, _Alloc>&
404 basic_string<_CharT, _Traits, _Alloc>::
405 _M_replace_dispatch(const_iterator __i1, const_iterator __i2,
406 _InputIterator __k1, _InputIterator __k2,
407 std::__false_type)
408 {
409 // _GLIBCXX_RESOLVE_LIB_DEFECTS
410 // 2788. unintentionally require a default constructible allocator
411 const basic_string __s(__k1, __k2, this->get_allocator());
412 const size_type __n1 = __i2 - __i1;
413 return _M_replace(__i1 - begin(), __n1, __s._M_data(),
414 __s.size());
415 }
416
417 template<typename _CharT, typename _Traits, typename _Alloc>
418 basic_string<_CharT, _Traits, _Alloc>&
419 basic_string<_CharT, _Traits, _Alloc>::
420 _M_replace_aux(size_type __pos1, size_type __n1, size_type __n2,
421 _CharT __c)
422 {
423 _M_check_length(__n1, __n2, "basic_string::_M_replace_aux");
424
425 const size_type __old_size = this->size();
426 const size_type __new_size = __old_size + __n2 - __n1;
427
428 if (__new_size <= this->capacity())
429 {
430 pointer __p = this->_M_data() + __pos1;
431
432 const size_type __how_much = __old_size - __pos1 - __n1;
433 if (__how_much && __n1 != __n2)
434 this->_S_move(__p + __n2, __p + __n1, __how_much);
435 }
436 else
437 this->_M_mutate(__pos1, __n1, 0, __n2);
438
439 if (__n2)
440 this->_S_assign(this->_M_data() + __pos1, __n2, __c);
441
442 this->_M_set_length(__new_size);
443 return *this;
444 }
445
446 template<typename _CharT, typename _Traits, typename _Alloc>
447 basic_string<_CharT, _Traits, _Alloc>&
448 basic_string<_CharT, _Traits, _Alloc>::
449 _M_replace(size_type __pos, size_type __len1, const _CharT* __s,
450 const size_type __len2)
451 {
452 _M_check_length(__len1, __len2, "basic_string::_M_replace");
453
454 const size_type __old_size = this->size();
455 const size_type __new_size = __old_size + __len2 - __len1;
456
457 if (__new_size <= this->capacity())
458 {
459 pointer __p = this->_M_data() + __pos;
460
461 const size_type __how_much = __old_size - __pos - __len1;
462 if (_M_disjunct(__s))
463 {
464 if (__how_much && __len1 != __len2)
465 this->_S_move(__p + __len2, __p + __len1, __how_much);
466 if (__len2)
467 this->_S_copy(__p, __s, __len2);
468 }
469 else
470 {
471 // Work in-place.
472 if (__len2 && __len2 <= __len1)
473 this->_S_move(__p, __s, __len2);
474 if (__how_much && __len1 != __len2)
475 this->_S_move(__p + __len2, __p + __len1, __how_much);
476 if (__len2 > __len1)
477 {
478 if (__s + __len2 <= __p + __len1)
479 this->_S_move(__p, __s, __len2);
480 else if (__s >= __p + __len1)
481 {
482 // Hint to middle end that __p and __s overlap
483 // (PR 98465).
484 const size_type __poff = (__s - __p) + (__len2 - __len1);
485 this->_S_copy(__p, __p + __poff, __len2);
486 }
487 else
488 {
489 const size_type __nleft = (__p + __len1) - __s;
490 this->_S_move(__p, __s, __nleft);
491 this->_S_copy(__p + __nleft, __p + __len2,
492 __len2 - __nleft);
493 }
494 }
495 }
496 }
497 else
498 this->_M_mutate(__pos, __len1, __s, __len2);
499
500 this->_M_set_length(__new_size);
501 return *this;
502 }
503
504 template<typename _CharT, typename _Traits, typename _Alloc>
505 typename basic_string<_CharT, _Traits, _Alloc>::size_type
506 basic_string<_CharT, _Traits, _Alloc>::
507 copy(_CharT* __s, size_type __n, size_type __pos) const
508 {
509 _M_check(__pos, "basic_string::copy");
510 __n = _M_limit(__pos, __n);
511 __glibcxx_requires_string_len(__s, __n);
512 if (__n)
513 _S_copy(__s, _M_data() + __pos, __n);
514 // 21.3.5.7 par 3: do not append null. (good.)
515 return __n;
516 }
517
518#else // !_GLIBCXX_USE_CXX11_ABI
519
520 template<typename _CharT, typename _Traits, typename _Alloc>
521 const typename basic_string<_CharT, _Traits, _Alloc>::size_type
522 basic_string<_CharT, _Traits, _Alloc>::
523 _Rep::_S_max_size = (((npos - sizeof(_Rep_base))/sizeof(_CharT)) - 1) / 4;
524
525 template<typename _CharT, typename _Traits, typename _Alloc>
526 const _CharT
527 basic_string<_CharT, _Traits, _Alloc>::
528 _Rep::_S_terminal = _CharT();
529
530 template<typename _CharT, typename _Traits, typename _Alloc>
531 const typename basic_string<_CharT, _Traits, _Alloc>::size_type
532 basic_string<_CharT, _Traits, _Alloc>::npos;
533
534 // Linker sets _S_empty_rep_storage to all 0s (one reference, empty string)
535 // at static init time (before static ctors are run).
536 template<typename _CharT, typename _Traits, typename _Alloc>
537 typename basic_string<_CharT, _Traits, _Alloc>::size_type
538 basic_string<_CharT, _Traits, _Alloc>::_Rep::_S_empty_rep_storage[
539 (sizeof(_Rep_base) + sizeof(_CharT) + sizeof(size_type) - 1) /
540 sizeof(size_type)];
541
542 // NB: This is the special case for Input Iterators, used in
543 // istreambuf_iterators, etc.
544 // Input Iterators have a cost structure very different from
545 // pointers, calling for a different coding style.
546 template<typename _CharT, typename _Traits, typename _Alloc>
547 template<typename _InIterator>
548 _CharT*
549 basic_string<_CharT, _Traits, _Alloc>::
550 _S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
551 input_iterator_tag)
552 {
553#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
554 if (__beg == __end && __a == _Alloc())
555 return _S_empty_rep()._M_refdata();
556#endif
557 // Avoid reallocation for common case.
558 _CharT __buf[128];
559 size_type __len = 0;
560 while (__beg != __end && __len < sizeof(__buf) / sizeof(_CharT))
561 {
562 __buf[__len++] = *__beg;
563 ++__beg;
564 }
565 _Rep* __r = _Rep::_S_create(__len, size_type(0), __a);
566 _M_copy(__r->_M_refdata(), __buf, __len);
567 __try
568 {
569 while (__beg != __end)
570 {
571 if (__len == __r->_M_capacity)
572 {
573 // Allocate more space.
574 _Rep* __another = _Rep::_S_create(__len + 1, __len, __a);
575 _M_copy(__another->_M_refdata(), __r->_M_refdata(), __len);
576 __r->_M_destroy(__a);
577 __r = __another;
578 }
579 __r->_M_refdata()[__len++] = *__beg;
580 ++__beg;
581 }
582 }
583 __catch(...)
584 {
585 __r->_M_destroy(__a);
586 __throw_exception_again;
587 }
588 __r->_M_set_length_and_sharable(__len);
589 return __r->_M_refdata();
590 }
591
592 template<typename _CharT, typename _Traits, typename _Alloc>
593 template <typename _InIterator>
594 _CharT*
595 basic_string<_CharT, _Traits, _Alloc>::
596 _S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
597 forward_iterator_tag)
598 {
599#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
600 if (__beg == __end && __a == _Alloc())
601 return _S_empty_rep()._M_refdata();
602#endif
603 // NB: Not required, but considered best practice.
604 if (__gnu_cxx::__is_null_pointer(__beg) && __beg != __end)
605 __throw_logic_error(__N("basic_string::_S_construct null not valid"));
606
607 const size_type __dnew = static_cast<size_type>(std::distance(__beg,
608 __end));
609 // Check for out_of_range and length_error exceptions.
610 _Rep* __r = _Rep::_S_create(__dnew, size_type(0), __a);
611 __try
612 { _S_copy_chars(__r->_M_refdata(), __beg, __end); }
613 __catch(...)
614 {
615 __r->_M_destroy(__a);
616 __throw_exception_again;
617 }
618 __r->_M_set_length_and_sharable(__dnew);
619 return __r->_M_refdata();
620 }
621
622 template<typename _CharT, typename _Traits, typename _Alloc>
623 _CharT*
624 basic_string<_CharT, _Traits, _Alloc>::
625 _S_construct(size_type __n, _CharT __c, const _Alloc& __a)
626 {
627#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
628 if (__n == 0 && __a == _Alloc())
629 return _S_empty_rep()._M_refdata();
630#endif
631 // Check for out_of_range and length_error exceptions.
632 _Rep* __r = _Rep::_S_create(__n, size_type(0), __a);
633 if (__n)
634 _M_assign(__r->_M_refdata(), __n, __c);
635
636 __r->_M_set_length_and_sharable(__n);
637 return __r->_M_refdata();
638 }
639
640 template<typename _CharT, typename _Traits, typename _Alloc>
641 basic_string<_CharT, _Traits, _Alloc>::
642 basic_string(const basic_string& __str, size_type __pos, const _Alloc& __a)
643 : _M_dataplus(_S_construct(__str._M_data()
644 + __str._M_check(__pos,
645 "basic_string::basic_string"),
646 __str._M_data() + __str._M_limit(__pos, npos)
647 + __pos, __a), __a)
648 { }
649
650 template<typename _CharT, typename _Traits, typename _Alloc>
651 basic_string<_CharT, _Traits, _Alloc>::
652 basic_string(const basic_string& __str, size_type __pos, size_type __n)
653 : _M_dataplus(_S_construct(__str._M_data()
654 + __str._M_check(__pos,
655 "basic_string::basic_string"),
656 __str._M_data() + __str._M_limit(__pos, __n)
657 + __pos, _Alloc()), _Alloc())
658 { }
659
660 template<typename _CharT, typename _Traits, typename _Alloc>
661 basic_string<_CharT, _Traits, _Alloc>::
662 basic_string(const basic_string& __str, size_type __pos,
663 size_type __n, const _Alloc& __a)
664 : _M_dataplus(_S_construct(__str._M_data()
665 + __str._M_check(__pos,
666 "basic_string::basic_string"),
667 __str._M_data() + __str._M_limit(__pos, __n)
668 + __pos, __a), __a)
669 { }
670
671 template<typename _CharT, typename _Traits, typename _Alloc>
672 basic_string<_CharT, _Traits, _Alloc>&
673 basic_string<_CharT, _Traits, _Alloc>::
674 assign(const basic_string& __str)
675 {
676 if (_M_rep() != __str._M_rep())
677 {
678 // XXX MT
679 const allocator_type __a = this->get_allocator();
680 _CharT* __tmp = __str._M_rep()->_M_grab(__a, __str.get_allocator());
681 _M_rep()->_M_dispose(__a);
682 _M_data(__tmp);
683 }
684 return *this;
685 }
686
687 template<typename _CharT, typename _Traits, typename _Alloc>
688 basic_string<_CharT, _Traits, _Alloc>&
689 basic_string<_CharT, _Traits, _Alloc>::
690 assign(const _CharT* __s, size_type __n)
691 {
692 __glibcxx_requires_string_len(__s, __n);
693 _M_check_length(this->size(), __n, "basic_string::assign");
694 if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
695 return _M_replace_safe(size_type(0), this->size(), __s, __n);
696 else
697 {
698 // Work in-place.
699 const size_type __pos = __s - _M_data();
700 if (__pos >= __n)
701 _M_copy(_M_data(), __s, __n);
702 else if (__pos)
703 _M_move(_M_data(), __s, __n);
704 _M_rep()->_M_set_length_and_sharable(__n);
705 return *this;
706 }
707 }
708
709 template<typename _CharT, typename _Traits, typename _Alloc>
710 basic_string<_CharT, _Traits, _Alloc>&
711 basic_string<_CharT, _Traits, _Alloc>::
712 append(size_type __n, _CharT __c)
713 {
714 if (__n)
715 {
716 _M_check_length(size_type(0), __n, "basic_string::append");
717 const size_type __len = __n + this->size();
718 if (__len > this->capacity() || _M_rep()->_M_is_shared())
719 this->reserve(__len);
720 _M_assign(_M_data() + this->size(), __n, __c);
721 _M_rep()->_M_set_length_and_sharable(__len);
722 }
723 return *this;
724 }
725
726 template<typename _CharT, typename _Traits, typename _Alloc>
727 basic_string<_CharT, _Traits, _Alloc>&
728 basic_string<_CharT, _Traits, _Alloc>::
729 append(const _CharT* __s, size_type __n)
730 {
731 __glibcxx_requires_string_len(__s, __n);
732 if (__n)
733 {
734 _M_check_length(size_type(0), __n, "basic_string::append");
735 const size_type __len = __n + this->size();
736 if (__len > this->capacity() || _M_rep()->_M_is_shared())
737 {
738 if (_M_disjunct(__s))
739 this->reserve(__len);
740 else
741 {
742 const size_type __off = __s - _M_data();
743 this->reserve(__len);
744 __s = _M_data() + __off;
745 }
746 }
747 _M_copy(_M_data() + this->size(), __s, __n);
748 _M_rep()->_M_set_length_and_sharable(__len);
749 }
750 return *this;
751 }
752
753 template<typename _CharT, typename _Traits, typename _Alloc>
754 basic_string<_CharT, _Traits, _Alloc>&
755 basic_string<_CharT, _Traits, _Alloc>::
756 append(const basic_string& __str)
757 {
758 const size_type __size = __str.size();
759 if (__size)
760 {
761 const size_type __len = __size + this->size();
762 if (__len > this->capacity() || _M_rep()->_M_is_shared())
763 this->reserve(__len);
764 _M_copy(_M_data() + this->size(), __str._M_data(), __size);
765 _M_rep()->_M_set_length_and_sharable(__len);
766 }
767 return *this;
768 }
769
770 template<typename _CharT, typename _Traits, typename _Alloc>
771 basic_string<_CharT, _Traits, _Alloc>&
772 basic_string<_CharT, _Traits, _Alloc>::
773 append(const basic_string& __str, size_type __pos, size_type __n)
774 {
775 __str._M_check(__pos, "basic_string::append");
776 __n = __str._M_limit(__pos, __n);
777 if (__n)
778 {
779 const size_type __len = __n + this->size();
780 if (__len > this->capacity() || _M_rep()->_M_is_shared())
781 this->reserve(__len);
782 _M_copy(_M_data() + this->size(), __str._M_data() + __pos, __n);
783 _M_rep()->_M_set_length_and_sharable(__len);
784 }
785 return *this;
786 }
787
788 template<typename _CharT, typename _Traits, typename _Alloc>
789 basic_string<_CharT, _Traits, _Alloc>&
790 basic_string<_CharT, _Traits, _Alloc>::
791 insert(size_type __pos, const _CharT* __s, size_type __n)
792 {
793 __glibcxx_requires_string_len(__s, __n);
794 _M_check(__pos, "basic_string::insert");
795 _M_check_length(size_type(0), __n, "basic_string::insert");
796 if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
797 return _M_replace_safe(__pos, size_type(0), __s, __n);
798 else
799 {
800 // Work in-place.
801 const size_type __off = __s - _M_data();
802 _M_mutate(__pos, 0, __n);
803 __s = _M_data() + __off;
804 _CharT* __p = _M_data() + __pos;
805 if (__s + __n <= __p)
806 _M_copy(__p, __s, __n);
807 else if (__s >= __p)
808 _M_copy(__p, __s + __n, __n);
809 else
810 {
811 const size_type __nleft = __p - __s;
812 _M_copy(__p, __s, __nleft);
813 _M_copy(__p + __nleft, __p + __n, __n - __nleft);
814 }
815 return *this;
816 }
817 }
818
819 template<typename _CharT, typename _Traits, typename _Alloc>
820 typename basic_string<_CharT, _Traits, _Alloc>::iterator
821 basic_string<_CharT, _Traits, _Alloc>::
822 erase(iterator __first, iterator __last)
823 {
824 _GLIBCXX_DEBUG_PEDASSERT(__first >= _M_ibegin() && __first <= __last
825 && __last <= _M_iend());
826
827 // NB: This isn't just an optimization (bail out early when
828 // there is nothing to do, really), it's also a correctness
829 // issue vs MT, see libstdc++/40518.
830 const size_type __size = __last - __first;
831 if (__size)
832 {
833 const size_type __pos = __first - _M_ibegin();
834 _M_mutate(__pos, __size, size_type(0));
835 _M_rep()->_M_set_leaked();
836 return iterator(_M_data() + __pos);
837 }
838 else
839 return __first;
840 }
841
842 template<typename _CharT, typename _Traits, typename _Alloc>
843 basic_string<_CharT, _Traits, _Alloc>&
844 basic_string<_CharT, _Traits, _Alloc>::
845 replace(size_type __pos, size_type __n1, const _CharT* __s,
846 size_type __n2)
847 {
848 __glibcxx_requires_string_len(__s, __n2);
849 _M_check(__pos, "basic_string::replace");
850 __n1 = _M_limit(__pos, __n1);
851 _M_check_length(__n1, __n2, "basic_string::replace");
852 bool __left;
853 if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
854 return _M_replace_safe(__pos, __n1, __s, __n2);
855 else if ((__left = __s + __n2 <= _M_data() + __pos)
856 || _M_data() + __pos + __n1 <= __s)
857 {
858 // Work in-place: non-overlapping case.
859 size_type __off = __s - _M_data();
860 __left ? __off : (__off += __n2 - __n1);
861 _M_mutate(__pos, __n1, __n2);
862 _M_copy(_M_data() + __pos, _M_data() + __off, __n2);
863 return *this;
864 }
865 else
866 {
867 // Todo: overlapping case.
868 const basic_string __tmp(__s, __n2);
869 return _M_replace_safe(__pos, __n1, __tmp._M_data(), __n2);
870 }
871 }
872
873 template<typename _CharT, typename _Traits, typename _Alloc>
874 void
875 basic_string<_CharT, _Traits, _Alloc>::_Rep::
876 _M_destroy(const _Alloc& __a) throw ()
877 {
878 const size_type __size = sizeof(_Rep_base) +
879 (this->_M_capacity + 1) * sizeof(_CharT);
880 _Raw_bytes_alloc(__a).deallocate(reinterpret_cast<char*>(this), __size);
881 }
882
883 template<typename _CharT, typename _Traits, typename _Alloc>
884 void
885 basic_string<_CharT, _Traits, _Alloc>::
886 _M_leak_hard()
887 {
888#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
889 if (_M_rep() == &_S_empty_rep())
890 return;
891#endif
892 if (_M_rep()->_M_is_shared())
893 _M_mutate(0, 0, 0);
894 _M_rep()->_M_set_leaked();
895 }
896
897 template<typename _CharT, typename _Traits, typename _Alloc>
898 void
899 basic_string<_CharT, _Traits, _Alloc>::
900 _M_mutate(size_type __pos, size_type __len1, size_type __len2)
901 {
902 const size_type __old_size = this->size();
903 const size_type __new_size = __old_size + __len2 - __len1;
904 const size_type __how_much = __old_size - __pos - __len1;
905
906 if (__new_size > this->capacity() || _M_rep()->_M_is_shared())
907 {
908 // Must reallocate.
909 const allocator_type __a = get_allocator();
910 _Rep* __r = _Rep::_S_create(__new_size, this->capacity(), __a);
911
912 if (__pos)
913 _M_copy(__r->_M_refdata(), _M_data(), __pos);
914 if (__how_much)
915 _M_copy(__r->_M_refdata() + __pos + __len2,
916 _M_data() + __pos + __len1, __how_much);
917
918 _M_rep()->_M_dispose(__a);
919 _M_data(__r->_M_refdata());
920 }
921 else if (__how_much && __len1 != __len2)
922 {
923 // Work in-place.
924 _M_move(_M_data() + __pos + __len2,
925 _M_data() + __pos + __len1, __how_much);
926 }
927 _M_rep()->_M_set_length_and_sharable(__new_size);
928 }
929
930 template<typename _CharT, typename _Traits, typename _Alloc>
931 void
932 basic_string<_CharT, _Traits, _Alloc>::
933 reserve(size_type __res)
934 {
935 const size_type __capacity = capacity();
936
937 // _GLIBCXX_RESOLVE_LIB_DEFECTS
938 // 2968. Inconsistencies between basic_string reserve and
939 // vector/unordered_map/unordered_set reserve functions
940 // P0966 reserve should not shrink
941 if (__res <= __capacity)
942 {
943 if (!_M_rep()->_M_is_shared())
944 return;
945
946 // unshare, but keep same capacity
947 __res = __capacity;
948 }
949
950 const allocator_type __a = get_allocator();
951 _CharT* __tmp = _M_rep()->_M_clone(__a, __res - this->size());
952 _M_rep()->_M_dispose(__a);
953 _M_data(__tmp);
954 }
955
956 template<typename _CharT, typename _Traits, typename _Alloc>
957 void
958 basic_string<_CharT, _Traits, _Alloc>::
959 swap(basic_string& __s)
960 _GLIBCXX_NOEXCEPT_IF(allocator_traits<_Alloc>::is_always_equal::value)
961 {
962 if (_M_rep()->_M_is_leaked())
963 _M_rep()->_M_set_sharable();
964 if (__s._M_rep()->_M_is_leaked())
965 __s._M_rep()->_M_set_sharable();
966 if (this->get_allocator() == __s.get_allocator())
967 {
968 _CharT* __tmp = _M_data();
969 _M_data(__s._M_data());
970 __s._M_data(__tmp);
971 }
972 // The code below can usually be optimized away.
973 else
974 {
975 const basic_string __tmp1(_M_ibegin(), _M_iend(),
976 __s.get_allocator());
977 const basic_string __tmp2(__s._M_ibegin(), __s._M_iend(),
978 this->get_allocator());
979 *this = __tmp2;
980 __s = __tmp1;
981 }
982 }
983
984 template<typename _CharT, typename _Traits, typename _Alloc>
985 typename basic_string<_CharT, _Traits, _Alloc>::_Rep*
986 basic_string<_CharT, _Traits, _Alloc>::_Rep::
987 _S_create(size_type __capacity, size_type __old_capacity,
988 const _Alloc& __alloc)
989 {
990 // _GLIBCXX_RESOLVE_LIB_DEFECTS
991 // 83. String::npos vs. string::max_size()
992 if (__capacity > _S_max_size)
993 __throw_length_error(__N("basic_string::_S_create"));
994
995 // The standard places no restriction on allocating more memory
996 // than is strictly needed within this layer at the moment or as
997 // requested by an explicit application call to reserve(n).
998
999 // Many malloc implementations perform quite poorly when an
1000 // application attempts to allocate memory in a stepwise fashion
1001 // growing each allocation size by only 1 char. Additionally,
1002 // it makes little sense to allocate less linear memory than the
1003 // natural blocking size of the malloc implementation.
1004 // Unfortunately, we would need a somewhat low-level calculation
1005 // with tuned parameters to get this perfect for any particular
1006 // malloc implementation. Fortunately, generalizations about
1007 // common features seen among implementations seems to suffice.
1008
1009 // __pagesize need not match the actual VM page size for good
1010 // results in practice, thus we pick a common value on the low
1011 // side. __malloc_header_size is an estimate of the amount of
1012 // overhead per memory allocation (in practice seen N * sizeof
1013 // (void*) where N is 0, 2 or 4). According to folklore,
1014 // picking this value on the high side is better than
1015 // low-balling it (especially when this algorithm is used with
1016 // malloc implementations that allocate memory blocks rounded up
1017 // to a size which is a power of 2).
1018 const size_type __pagesize = 4096;
1019 const size_type __malloc_header_size = 4 * sizeof(void*);
1020
1021 // The below implements an exponential growth policy, necessary to
1022 // meet amortized linear time requirements of the library: see
1023 // http://gcc.gnu.org/ml/libstdc++/2001-07/msg00085.html.
1024 // It's active for allocations requiring an amount of memory above
1025 // system pagesize. This is consistent with the requirements of the
1026 // standard: http://gcc.gnu.org/ml/libstdc++/2001-07/msg00130.html
1027 if (__capacity > __old_capacity && __capacity < 2 * __old_capacity)
1028 __capacity = 2 * __old_capacity;
1029
1030 // NB: Need an array of char_type[__capacity], plus a terminating
1031 // null char_type() element, plus enough for the _Rep data structure.
1032 // Whew. Seemingly so needy, yet so elemental.
1033 size_type __size = (__capacity + 1) * sizeof(_CharT) + sizeof(_Rep);
1034
1035 const size_type __adj_size = __size + __malloc_header_size;
1036 if (__adj_size > __pagesize && __capacity > __old_capacity)
1037 {
1038 const size_type __extra = __pagesize - __adj_size % __pagesize;
1039 __capacity += __extra / sizeof(_CharT);
1040 // Never allocate a string bigger than _S_max_size.
1041 if (__capacity > _S_max_size)
1042 __capacity = _S_max_size;
1043 __size = (__capacity + 1) * sizeof(_CharT) + sizeof(_Rep);
1044 }
1045
1046 // NB: Might throw, but no worries about a leak, mate: _Rep()
1047 // does not throw.
1048 void* __place = _Raw_bytes_alloc(__alloc).allocate(__size);
1049 _Rep *__p = new (__place) _Rep;
1050 __p->_M_capacity = __capacity;
1051 // ABI compatibility - 3.4.x set in _S_create both
1052 // _M_refcount and _M_length. All callers of _S_create
1053 // in basic_string.tcc then set just _M_length.
1054 // In 4.0.x and later both _M_refcount and _M_length
1055 // are initialized in the callers, unfortunately we can
1056 // have 3.4.x compiled code with _S_create callers inlined
1057 // calling 4.0.x+ _S_create.
1058 __p->_M_set_sharable();
1059 return __p;
1060 }
1061
1062 template<typename _CharT, typename _Traits, typename _Alloc>
1063 _CharT*
1064 basic_string<_CharT, _Traits, _Alloc>::_Rep::
1065 _M_clone(const _Alloc& __alloc, size_type __res)
1066 {
1067 // Requested capacity of the clone.
1068 const size_type __requested_cap = this->_M_length + __res;
1069 _Rep* __r = _Rep::_S_create(__requested_cap, this->_M_capacity,
1070 __alloc);
1071 if (this->_M_length)
1072 _M_copy(__r->_M_refdata(), _M_refdata(), this->_M_length);
1073
1074 __r->_M_set_length_and_sharable(this->_M_length);
1075 return __r->_M_refdata();
1076 }
1077
1078 template<typename _CharT, typename _Traits, typename _Alloc>
1079 void
1080 basic_string<_CharT, _Traits, _Alloc>::
1081 resize(size_type __n, _CharT __c)
1082 {
1083 const size_type __size = this->size();
1084 _M_check_length(__size, __n, "basic_string::resize");
1085 if (__size < __n)
1086 this->append(__n - __size, __c);
1087 else if (__n < __size)
1088 this->erase(__n);
1089 // else nothing (in particular, avoid calling _M_mutate() unnecessarily.)
1090 }
1091
1092 template<typename _CharT, typename _Traits, typename _Alloc>
1093 template<typename _InputIterator>
1094 basic_string<_CharT, _Traits, _Alloc>&
1095 basic_string<_CharT, _Traits, _Alloc>::
1096 _M_replace_dispatch(iterator __i1, iterator __i2, _InputIterator __k1,
1097 _InputIterator __k2, __false_type)
1098 {
1099 const basic_string __s(__k1, __k2);
1100 const size_type __n1 = __i2 - __i1;
1101 _M_check_length(__n1, __s.size(), "basic_string::_M_replace_dispatch");
1102 return _M_replace_safe(__i1 - _M_ibegin(), __n1, __s._M_data(),
1103 __s.size());
1104 }
1105
1106 template<typename _CharT, typename _Traits, typename _Alloc>
1107 basic_string<_CharT, _Traits, _Alloc>&
1108 basic_string<_CharT, _Traits, _Alloc>::
1109 _M_replace_aux(size_type __pos1, size_type __n1, size_type __n2,
1110 _CharT __c)
1111 {
1112 _M_check_length(__n1, __n2, "basic_string::_M_replace_aux");
1113 _M_mutate(__pos1, __n1, __n2);
1114 if (__n2)
1115 _M_assign(_M_data() + __pos1, __n2, __c);
1116 return *this;
1117 }
1118
1119 template<typename _CharT, typename _Traits, typename _Alloc>
1120 basic_string<_CharT, _Traits, _Alloc>&
1121 basic_string<_CharT, _Traits, _Alloc>::
1122 _M_replace_safe(size_type __pos1, size_type __n1, const _CharT* __s,
1123 size_type __n2)
1124 {
1125 _M_mutate(__pos1, __n1, __n2);
1126 if (__n2)
1127 _M_copy(_M_data() + __pos1, __s, __n2);
1128 return *this;
1129 }
1130
1131 template<typename _CharT, typename _Traits, typename _Alloc>
1132 void
1133 basic_string<_CharT, _Traits, _Alloc>::
1134 reserve()
1135 {
1136#if __cpp_exceptions
1137 if (length() < capacity() || _M_rep()->_M_is_shared())
1138 try
1139 {
1140 const allocator_type __a = get_allocator();
1141 _CharT* __tmp = _M_rep()->_M_clone(__a);
1142 _M_rep()->_M_dispose(__a);
1143 _M_data(__tmp);
1144 }
1145 catch (const __cxxabiv1::__forced_unwind&)
1146 { throw; }
1147 catch (...)
1148 { /* swallow the exception */ }
1149#endif
1150 }
1151
1152 template<typename _CharT, typename _Traits, typename _Alloc>
1153 typename basic_string<_CharT, _Traits, _Alloc>::size_type
1154 basic_string<_CharT, _Traits, _Alloc>::
1155 copy(_CharT* __s, size_type __n, size_type __pos) const
1156 {
1157 _M_check(__pos, "basic_string::copy");
1158 __n = _M_limit(__pos, __n);
1159 __glibcxx_requires_string_len(__s, __n);
1160 if (__n)
1161 _M_copy(__s, _M_data() + __pos, __n);
1162 // 21.3.5.7 par 3: do not append null. (good.)
1163 return __n;
1164 }
1165#endif // !_GLIBCXX_USE_CXX11_ABI
1166
1167 template<typename _CharT, typename _Traits, typename _Alloc>
1168 basic_string<_CharT, _Traits, _Alloc>
1169 operator+(const _CharT* __lhs,
1170 const basic_string<_CharT, _Traits, _Alloc>& __rhs)
1171 {
1172 __glibcxx_requires_string(__lhs);
1173 typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
1174 typedef typename __string_type::size_type __size_type;
1175 typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template
1176 rebind<_CharT>::other _Char_alloc_type;
1177 typedef __gnu_cxx::__alloc_traits<_Char_alloc_type> _Alloc_traits;
1178 const __size_type __len = _Traits::length(__lhs);
1179 __string_type __str(_Alloc_traits::_S_select_on_copy(
1180 __rhs.get_allocator()));
1181 __str.reserve(__len + __rhs.size());
1182 __str.append(__lhs, __len);
1183 __str.append(__rhs);
1184 return __str;
1185 }
1186
1187 template<typename _CharT, typename _Traits, typename _Alloc>
1188 basic_string<_CharT, _Traits, _Alloc>
1189 operator+(_CharT __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs)
1190 {
1191 typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
1192 typedef typename __string_type::size_type __size_type;
1193 typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template
1194 rebind<_CharT>::other _Char_alloc_type;
1195 typedef __gnu_cxx::__alloc_traits<_Char_alloc_type> _Alloc_traits;
1196 __string_type __str(_Alloc_traits::_S_select_on_copy(
1197 __rhs.get_allocator()));
1198 const __size_type __len = __rhs.size();
1199 __str.reserve(__len + 1);
1200 __str.append(__size_type(1), __lhs);
1201 __str.append(__rhs);
1202 return __str;
1203 }
1204
1205 template<typename _CharT, typename _Traits, typename _Alloc>
1206 typename basic_string<_CharT, _Traits, _Alloc>::size_type
1207 basic_string<_CharT, _Traits, _Alloc>::
1208 find(const _CharT* __s, size_type __pos, size_type __n) const
1209 _GLIBCXX_NOEXCEPT
1210 {
1211 __glibcxx_requires_string_len(__s, __n);
1212 const size_type __size = this->size();
1213
1214 if (__n == 0)
1215 return __pos <= __size ? __pos : npos;
1216 if (__pos >= __size)
1217 return npos;
1218
1219 const _CharT __elem0 = __s[0];
1220 const _CharT* const __data = data();
1221 const _CharT* __first = __data + __pos;
1222 const _CharT* const __last = __data + __size;
1223 size_type __len = __size - __pos;
1224
1225 while (__len >= __n)
1226 {
1227 // Find the first occurrence of __elem0:
1228 __first = traits_type::find(__first, __len - __n + 1, __elem0);
1229 if (!__first)
1230 return npos;
1231 // Compare the full strings from the first occurrence of __elem0.
1232 // We already know that __first[0] == __s[0] but compare them again
1233 // anyway because __s is probably aligned, which helps memcmp.
1234 if (traits_type::compare(__first, __s, __n) == 0)
1235 return __first - __data;
1236 __len = __last - ++__first;
1237 }
1238 return npos;
1239 }
1240
1241 template<typename _CharT, typename _Traits, typename _Alloc>
1242 typename basic_string<_CharT, _Traits, _Alloc>::size_type
1243 basic_string<_CharT, _Traits, _Alloc>::
1244 find(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
1245 {
1246 size_type __ret = npos;
1247 const size_type __size = this->size();
1248 if (__pos < __size)
1249 {
1250 const _CharT* __data = _M_data();
1251 const size_type __n = __size - __pos;
1252 const _CharT* __p = traits_type::find(__data + __pos, __n, __c);
1253 if (__p)
1254 __ret = __p - __data;
1255 }
1256 return __ret;
1257 }
1258
1259 template<typename _CharT, typename _Traits, typename _Alloc>
1260 typename basic_string<_CharT, _Traits, _Alloc>::size_type
1261 basic_string<_CharT, _Traits, _Alloc>::
1262 rfind(const _CharT* __s, size_type __pos, size_type __n) const
1263 _GLIBCXX_NOEXCEPT
1264 {
1265 __glibcxx_requires_string_len(__s, __n);
1266 const size_type __size = this->size();
1267 if (__n <= __size)
1268 {
1269 __pos = std::min(size_type(__size - __n), __pos);
1270 const _CharT* __data = _M_data();
1271 do
1272 {
1273 if (traits_type::compare(__data + __pos, __s, __n) == 0)
1274 return __pos;
1275 }
1276 while (__pos-- > 0);
1277 }
1278 return npos;
1279 }
1280
1281 template<typename _CharT, typename _Traits, typename _Alloc>
1282 typename basic_string<_CharT, _Traits, _Alloc>::size_type
1283 basic_string<_CharT, _Traits, _Alloc>::
1284 rfind(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
1285 {
1286 size_type __size = this->size();
1287 if (__size)
1288 {
1289 if (--__size > __pos)
1290 __size = __pos;
1291 for (++__size; __size-- > 0; )
1292 if (traits_type::eq(_M_data()[__size], __c))
1293 return __size;
1294 }
1295 return npos;
1296 }
1297
1298 template<typename _CharT, typename _Traits, typename _Alloc>
1299 typename basic_string<_CharT, _Traits, _Alloc>::size_type
1300 basic_string<_CharT, _Traits, _Alloc>::
1301 find_first_of(const _CharT* __s, size_type __pos, size_type __n) const
1302 _GLIBCXX_NOEXCEPT
1303 {
1304 __glibcxx_requires_string_len(__s, __n);
1305 for (; __n && __pos < this->size(); ++__pos)
1306 {
1307 const _CharT* __p = traits_type::find(__s, __n, _M_data()[__pos]);
1308 if (__p)
1309 return __pos;
1310 }
1311 return npos;
1312 }
1313
1314 template<typename _CharT, typename _Traits, typename _Alloc>
1315 typename basic_string<_CharT, _Traits, _Alloc>::size_type
1316 basic_string<_CharT, _Traits, _Alloc>::
1317 find_last_of(const _CharT* __s, size_type __pos, size_type __n) const
1318 _GLIBCXX_NOEXCEPT
1319 {
1320 __glibcxx_requires_string_len(__s, __n);
1321 size_type __size = this->size();
1322 if (__size && __n)
1323 {
1324 if (--__size > __pos)
1325 __size = __pos;
1326 do
1327 {
1328 if (traits_type::find(__s, __n, _M_data()[__size]))
1329 return __size;
1330 }
1331 while (__size-- != 0);
1332 }
1333 return npos;
1334 }
1335
1336 template<typename _CharT, typename _Traits, typename _Alloc>
1337 typename basic_string<_CharT, _Traits, _Alloc>::size_type
1338 basic_string<_CharT, _Traits, _Alloc>::
1339 find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const
1340 _GLIBCXX_NOEXCEPT
1341 {
1342 __glibcxx_requires_string_len(__s, __n);
1343 for (; __pos < this->size(); ++__pos)
1344 if (!traits_type::find(__s, __n, _M_data()[__pos]))
1345 return __pos;
1346 return npos;
1347 }
1348
1349 template<typename _CharT, typename _Traits, typename _Alloc>
1350 typename basic_string<_CharT, _Traits, _Alloc>::size_type
1351 basic_string<_CharT, _Traits, _Alloc>::
1352 find_first_not_of(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
1353 {
1354 for (; __pos < this->size(); ++__pos)
1355 if (!traits_type::eq(_M_data()[__pos], __c))
1356 return __pos;
1357 return npos;
1358 }
1359
1360 template<typename _CharT, typename _Traits, typename _Alloc>
1361 typename basic_string<_CharT, _Traits, _Alloc>::size_type
1362 basic_string<_CharT, _Traits, _Alloc>::
1363 find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const
1364 _GLIBCXX_NOEXCEPT
1365 {
1366 __glibcxx_requires_string_len(__s, __n);
1367 size_type __size = this->size();
1368 if (__size)
1369 {
1370 if (--__size > __pos)
1371 __size = __pos;
1372 do
1373 {
1374 if (!traits_type::find(__s, __n, _M_data()[__size]))
1375 return __size;
1376 }
1377 while (__size--);
1378 }
1379 return npos;
1380 }
1381
1382 template<typename _CharT, typename _Traits, typename _Alloc>
1383 typename basic_string<_CharT, _Traits, _Alloc>::size_type
1384 basic_string<_CharT, _Traits, _Alloc>::
1385 find_last_not_of(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
1386 {
1387 size_type __size = this->size();
1388 if (__size)
1389 {
1390 if (--__size > __pos)
1391 __size = __pos;
1392 do
1393 {
1394 if (!traits_type::eq(_M_data()[__size], __c))
1395 return __size;
1396 }
1397 while (__size--);
1398 }
1399 return npos;
1400 }
1401
1402 template<typename _CharT, typename _Traits, typename _Alloc>
1403 int
1404 basic_string<_CharT, _Traits, _Alloc>::
1405 compare(size_type __pos, size_type __n, const basic_string& __str) const
1406 {
1407 _M_check(__pos, "basic_string::compare");
1408 __n = _M_limit(__pos, __n);
1409 const size_type __osize = __str.size();
1410 const size_type __len = std::min(__n, __osize);
1411 int __r = traits_type::compare(_M_data() + __pos, __str.data(), __len);
1412 if (!__r)
1413 __r = _S_compare(__n, __osize);
1414 return __r;
1415 }
1416
1417 template<typename _CharT, typename _Traits, typename _Alloc>
1418 int
1419 basic_string<_CharT, _Traits, _Alloc>::
1420 compare(size_type __pos1, size_type __n1, const basic_string& __str,
1421 size_type __pos2, size_type __n2) const
1422 {
1423 _M_check(__pos1, "basic_string::compare");
1424 __str._M_check(__pos2, "basic_string::compare");
1425 __n1 = _M_limit(__pos1, __n1);
1426 __n2 = __str._M_limit(__pos2, __n2);
1427 const size_type __len = std::min(__n1, __n2);
1428 int __r = traits_type::compare(_M_data() + __pos1,
1429 __str.data() + __pos2, __len);
1430 if (!__r)
1431 __r = _S_compare(__n1, __n2);
1432 return __r;
1433 }
1434
1435 template<typename _CharT, typename _Traits, typename _Alloc>
1436 int
1437 basic_string<_CharT, _Traits, _Alloc>::
1438 compare(const _CharT* __s) const _GLIBCXX_NOEXCEPT
1439 {
1440 __glibcxx_requires_string(__s);
1441 const size_type __size = this->size();
1442 const size_type __osize = traits_type::length(__s);
1443 const size_type __len = std::min(__size, __osize);
1444 int __r = traits_type::compare(_M_data(), __s, __len);
1445 if (!__r)
1446 __r = _S_compare(__size, __osize);
1447 return __r;
1448 }
1449
1450 template<typename _CharT, typename _Traits, typename _Alloc>
1451 int
1452 basic_string <_CharT, _Traits, _Alloc>::
1453 compare(size_type __pos, size_type __n1, const _CharT* __s) const
1454 {
1455 __glibcxx_requires_string(__s);
1456 _M_check(__pos, "basic_string::compare");
1457 __n1 = _M_limit(__pos, __n1);
1458 const size_type __osize = traits_type::length(__s);
1459 const size_type __len = std::min(__n1, __osize);
1460 int __r = traits_type::compare(_M_data() + __pos, __s, __len);
1461 if (!__r)
1462 __r = _S_compare(__n1, __osize);
1463 return __r;
1464 }
1465
1466 template<typename _CharT, typename _Traits, typename _Alloc>
1467 int
1468 basic_string <_CharT, _Traits, _Alloc>::
1469 compare(size_type __pos, size_type __n1, const _CharT* __s,
1470 size_type __n2) const
1471 {
1472 __glibcxx_requires_string_len(__s, __n2);
1473 _M_check(__pos, "basic_string::compare");
1474 __n1 = _M_limit(__pos, __n1);
1475 const size_type __len = std::min(__n1, __n2);
1476 int __r = traits_type::compare(_M_data() + __pos, __s, __len);
1477 if (!__r)
1478 __r = _S_compare(__n1, __n2);
1479 return __r;
1480 }
1481
1482 // 21.3.7.9 basic_string::getline and operators
1483 template<typename _CharT, typename _Traits, typename _Alloc>
1484 basic_istream<_CharT, _Traits>&
1485 operator>>(basic_istream<_CharT, _Traits>& __in,
1486 basic_string<_CharT, _Traits, _Alloc>& __str)
1487 {
1488 typedef basic_istream<_CharT, _Traits> __istream_type;
1489 typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
1490 typedef typename __istream_type::ios_base __ios_base;
1491 typedef typename __istream_type::int_type __int_type;
1492 typedef typename __string_type::size_type __size_type;
1493 typedef ctype<_CharT> __ctype_type;
1494 typedef typename __ctype_type::ctype_base __ctype_base;
1495
1496 __size_type __extracted = 0;
1497 typename __ios_base::iostate __err = __ios_base::goodbit;
1498 typename __istream_type::sentry __cerb(__in, false);
1499 if (__cerb)
1500 {
1501 __try
1502 {
1503 // Avoid reallocation for common case.
1504 __str.erase();
1505 _CharT __buf[128];
1506 __size_type __len = 0;
1507 const streamsize __w = __in.width();
1508 const __size_type __n = __w > 0 ? static_cast<__size_type>(__w)
1509 : __str.max_size();
1510 const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
1511 const __int_type __eof = _Traits::eof();
1512 __int_type __c = __in.rdbuf()->sgetc();
1513
1514 while (__extracted < __n
1515 && !_Traits::eq_int_type(__c, __eof)
1516 && !__ct.is(__ctype_base::space,
1517 _Traits::to_char_type(__c)))
1518 {
1519 if (__len == sizeof(__buf) / sizeof(_CharT))
1520 {
1521 __str.append(__buf, sizeof(__buf) / sizeof(_CharT));
1522 __len = 0;
1523 }
1524 __buf[__len++] = _Traits::to_char_type(__c);
1525 ++__extracted;
1526 __c = __in.rdbuf()->snextc();
1527 }
1528 __str.append(__buf, __len);
1529
1530 if (__extracted < __n && _Traits::eq_int_type(__c, __eof))
1531 __err |= __ios_base::eofbit;
1532 __in.width(0);
1533 }
1534 __catch(__cxxabiv1::__forced_unwind&)
1535 {
1536 __in._M_setstate(__ios_base::badbit);
1537 __throw_exception_again;
1538 }
1539 __catch(...)
1540 {
1541 // _GLIBCXX_RESOLVE_LIB_DEFECTS
1542 // 91. Description of operator>> and getline() for string<>
1543 // might cause endless loop
1544 __in._M_setstate(__ios_base::badbit);
1545 }
1546 }
1547 // 211. operator>>(istream&, string&) doesn't set failbit
1548 if (!__extracted)
1549 __err |= __ios_base::failbit;
1550 if (__err)
1551 __in.setstate(__err);
1552 return __in;
1553 }
1554
1555 template<typename _CharT, typename _Traits, typename _Alloc>
1556 basic_istream<_CharT, _Traits>&
1557 getline(basic_istream<_CharT, _Traits>& __in,
1558 basic_string<_CharT, _Traits, _Alloc>& __str, _CharT __delim)
1559 {
1560 typedef basic_istream<_CharT, _Traits> __istream_type;
1561 typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
1562 typedef typename __istream_type::ios_base __ios_base;
1563 typedef typename __istream_type::int_type __int_type;
1564 typedef typename __string_type::size_type __size_type;
1565
1566 __size_type __extracted = 0;
1567 const __size_type __n = __str.max_size();
1568 typename __ios_base::iostate __err = __ios_base::goodbit;
1569 typename __istream_type::sentry __cerb(__in, true);
1570 if (__cerb)
1571 {
1572 __try
1573 {
1574 __str.erase();
1575 const __int_type __idelim = _Traits::to_int_type(__delim);
1576 const __int_type __eof = _Traits::eof();
1577 __int_type __c = __in.rdbuf()->sgetc();
1578
1579 while (__extracted < __n
1580 && !_Traits::eq_int_type(__c, __eof)
1581 && !_Traits::eq_int_type(__c, __idelim))
1582 {
1583 __str += _Traits::to_char_type(__c);
1584 ++__extracted;
1585 __c = __in.rdbuf()->snextc();
1586 }
1587
1588 if (_Traits::eq_int_type(__c, __eof))
1589 __err |= __ios_base::eofbit;
1590 else if (_Traits::eq_int_type(__c, __idelim))
1591 {
1592 ++__extracted;
1593 __in.rdbuf()->sbumpc();
1594 }
1595 else
1596 __err |= __ios_base::failbit;
1597 }
1598 __catch(__cxxabiv1::__forced_unwind&)
1599 {
1600 __in._M_setstate(__ios_base::badbit);
1601 __throw_exception_again;
1602 }
1603 __catch(...)
1604 {
1605 // _GLIBCXX_RESOLVE_LIB_DEFECTS
1606 // 91. Description of operator>> and getline() for string<>
1607 // might cause endless loop
1608 __in._M_setstate(__ios_base::badbit);
1609 }
1610 }
1611 if (!__extracted)
1612 __err |= __ios_base::failbit;
1613 if (__err)
1614 __in.setstate(__err);
1615 return __in;
1616 }
1617
1618 // Inhibit implicit instantiations for required instantiations,
1619 // which are defined via explicit instantiations elsewhere.
1620#if _GLIBCXX_EXTERN_TEMPLATE
1621 // The explicit instantiation definitions in src/c++11/string-inst.cc and
1622 // src/c++17/string-inst.cc only instantiate the members required for C++17
1623 // and earlier standards (so not C++20's starts_with and ends_with).
1624 // Suppress the explicit instantiation declarations for C++20, so C++20
1625 // code will implicitly instantiate std::string and std::wstring as needed.
1626# if __cplusplus <= 201703L && _GLIBCXX_EXTERN_TEMPLATE > 0
1627 extern template class basic_string<char>;
1628# elif ! _GLIBCXX_USE_CXX11_ABI
1629 // Still need to prevent implicit instantiation of the COW empty rep,
1630 // to ensure the definition in libstdc++.so is unique (PR 86138).
1631 extern template basic_string<char>::size_type
1632 basic_string<char>::_Rep::_S_empty_rep_storage[];
1633# endif
1634
1635 extern template
1636 basic_istream<char>&
1637 operator>>(basic_istream<char>&, string&);
1638 extern template
1639 basic_ostream<char>&
1640 operator<<(basic_ostream<char>&, const string&);
1641 extern template
1642 basic_istream<char>&
1643 getline(basic_istream<char>&, string&, char);
1644 extern template
1645 basic_istream<char>&
1646 getline(basic_istream<char>&, string&);
1647
1648#ifdef _GLIBCXX_USE_WCHAR_T
1649# if __cplusplus <= 201703L && _GLIBCXX_EXTERN_TEMPLATE > 0
1650 extern template class basic_string<wchar_t>;
1651# elif ! _GLIBCXX_USE_CXX11_ABI
1652 extern template basic_string<wchar_t>::size_type
1653 basic_string<wchar_t>::_Rep::_S_empty_rep_storage[];
1654# endif
1655
1656 extern template
1657 basic_istream<wchar_t>&
1658 operator>>(basic_istream<wchar_t>&, wstring&);
1659 extern template
1660 basic_ostream<wchar_t>&
1661 operator<<(basic_ostream<wchar_t>&, const wstring&);
1662 extern template
1663 basic_istream<wchar_t>&
1664 getline(basic_istream<wchar_t>&, wstring&, wchar_t);
1665 extern template
1666 basic_istream<wchar_t>&
1667 getline(basic_istream<wchar_t>&, wstring&);
1668#endif // _GLIBCXX_USE_WCHAR_T
1669#endif // _GLIBCXX_EXTERN_TEMPLATE
1670
1671_GLIBCXX_END_NAMESPACE_VERSION
1672} // namespace std
1673
1674#endif
std::operator+
constexpr complex< _Tp > operator+(const complex< _Tp > &__x, const complex< _Tp > &__y)
Return new complex value x plus y.
Definition: complex:332
std::begin
_Tp * begin(valarray< _Tp > &__va) noexcept
Return an iterator pointing to the first element of the valarray.
Definition: valarray:1217
std::min
constexpr const _Tp & min(const _Tp &, const _Tp &)
This does what you think it does.
Definition: stl_algobase.h:230
std::wstring
basic_string< wchar_t > wstring
A string of wchar_t.
Definition: stringfwd.h:83
std
ISO C++ entities toplevel namespace is std.
std::streamsize
ptrdiff_t streamsize
Integral type for I/O operation counts and buffer sizes.
Definition: postypes.h:98
std::getline
basic_istream< _CharT, _Traits > & getline(basic_istream< _CharT, _Traits > &__is, basic_string< _CharT, _Traits, _Alloc > &__str, _CharT __delim)
Read a line from stream into a string.
Definition: basic_string.tcc:1557
std::distance
constexpr iterator_traits< _InputIterator >::difference_type distance(_InputIterator __first, _InputIterator __last)
A generalization of pointer arithmetic.
Definition: stl_iterator_base_funcs.h:138
std::size
constexpr auto size(const _Container &__cont) noexcept(noexcept(__cont.size())) -> decltype(__cont.size())
Return the size of a container.
Definition: range_access.h:245
std::operator>>
std::basic_istream< _CharT, _Traits > & operator>>(std::basic_istream< _CharT, _Traits > &__is, bitset< _Nb > &__x)
Global I/O operators for bitsets.
Definition: bitset:1472
std::operator<<
std::basic_ostream< _CharT, _Traits > & operator<<(std::basic_ostream< _CharT, _Traits > &__os, const bitset< _Nb > &__x)
Global I/O operators for bitsets.
Definition: bitset:1540
std::data
constexpr auto data(_Container &__cont) noexcept(noexcept(__cont.data())) -> decltype(__cont.data())
Return the data pointer of a container.
Definition: range_access.h:290
std::basic_ios::setstate
void setstate(iostate __state)
Sets additional flags in the error state.
Definition: basic_ios.h:157
std::basic_ios::rdbuf
basic_streambuf< _CharT, _Traits > * rdbuf() const
Accessing the underlying buffer.
Definition: basic_ios.h:321
std::basic_istream
Template class basic_istream.
Definition: istream:59
std::allocator_traits
Uniform interface to all allocator types.
Definition: bits/alloc_traits.h:91
std::basic_string
Managing sequences of characters and character-like objects.
Definition: basic_string.h:3175
std::basic_string::swap
void swap(basic_string &__s) noexcept(/*conditional */)
Swap contents with another string.
Definition: basic_string.tcc:959
std::basic_string::find_first_of
size_type find_first_of(const basic_string &__str, size_type __pos=0) const noexcept
Find position of a character of string.
Definition: basic_string.h:5461
std::basic_string::data
const _CharT * data() const noexcept
Return const pointer to contents.
Definition: basic_string.h:5268
std::basic_string::find
size_type find(const _CharT *__s, size_type __pos, size_type __n) const noexcept
Find position of a C substring.
Definition: basic_string.tcc:1208
std::basic_string::find_last_not_of
size_type find_last_not_of(const basic_string &__str, size_type __pos=npos) const noexcept
Find last position of a character not in string.
Definition: basic_string.h:5710
std::basic_string::compare
int compare(const basic_string &__str) const
Compare to a string.
Definition: basic_string.h:5812
std::basic_string::find_first_not_of
size_type find_first_not_of(const basic_string &__str, size_type __pos=0) const noexcept
Find position of a character not in string.
Definition: basic_string.h:5628
std::basic_string::insert
void insert(iterator __p, size_type __n, _CharT __c)
Insert multiple characters.
Definition: basic_string.h:4547
std::basic_string::assign
basic_string & assign(const basic_string &__str)
Set value to contents of another string.
Definition: basic_string.tcc:674
std::basic_string::copy
size_type copy(_CharT *__s, size_type __n, size_type __pos=0) const
Copy substring into C string.
Definition: basic_string.tcc:1155
std::basic_string::find_last_of
size_type find_last_of(const basic_string &__str, size_type __pos=npos) const noexcept
Find last position of a character of string.
Definition: basic_string.h:5545
std::basic_string::size
size_type size() const noexcept
Returns the number of characters in the string, not including any null-termination.
Definition: basic_string.h:3963
std::basic_string::rfind
size_type rfind(const basic_string &__str, size_type __pos=npos) const noexcept
Find last position of a string.
Definition: basic_string.h:5382
std::basic_string::resize
void resize(size_type __n, _CharT __c)
Resizes the string to the specified number of characters.
Definition: basic_string.tcc:1081
std::basic_string::reserve
void reserve()
Equivalent to shrink_to_fit().
Definition: basic_string.tcc:1134
std::basic_string::append
basic_string & append(const basic_string &__str)
Append a string to this string.
Definition: basic_string.tcc:756
std::basic_string::npos
static const size_type npos
Value returned by various member functions when they fail.
Definition: basic_string.h:3388
std::basic_string::get_allocator
allocator_type get_allocator() const noexcept
Return copy of allocator used to construct this string.
Definition: basic_string.h:5290
std::basic_string::basic_string
basic_string() noexcept
Default constructor creates an empty string.
Definition: basic_string.h:3581
std::basic_string::max_size
size_type max_size() const noexcept
Returns the size() of the largest possible string.
Definition: basic_string.h:3974
std::basic_string::erase
basic_string & erase(size_type __pos=0, size_type __n=npos)
Remove characters.
Definition: basic_string.h:4759
std::basic_string::replace
basic_string & replace(size_type __pos, size_type __n, const basic_string &__str)
Replace characters with value from another string.
Definition: basic_string.h:4829
__cxxabiv1::__forced_unwind
Thrown as part of forced unwinding.
Definition: cxxabi_forced.h:49
std::ios_base::width
streamsize width() const
Flags access.
Definition: ios_base.h:742
std::ios_base::getloc
locale getloc() const
Locale access.
Definition: ios_base.h:793
std::ctype
Primary class template ctype facet.
Definition: locale_facets.h:616
std::input_iterator_tag
Marking input iterators.
Definition: stl_iterator_base_types.h:93
std::forward_iterator_tag
Forward iterators support a superset of input iterator operations.
Definition: stl_iterator_base_types.h:99
std::iterator
Common iterator class.
Definition: stl_iterator_base_types.h:128
__gnu_cxx::__alloc_traits
Uniform interface to C++98 and C++11 allocators.
Definition: ext/alloc_traits.h:52