1 | // Deque implementation -*- C++ -*- |
2 | |
3 | // Copyright (C) 2001-2021 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 | /* |
26 | * |
27 | * Copyright (c) 1994 |
28 | * Hewlett-Packard Company |
29 | * |
30 | * Permission to use, copy, modify, distribute and sell this software |
31 | * and its documentation for any purpose is hereby granted without fee, |
32 | * provided that the above copyright notice appear in all copies and |
33 | * that both that copyright notice and this permission notice appear |
34 | * in supporting documentation. Hewlett-Packard Company makes no |
35 | * representations about the suitability of this software for any |
36 | * purpose. It is provided "as is" without express or implied warranty. |
37 | * |
38 | * |
39 | * Copyright (c) 1997 |
40 | * Silicon Graphics Computer Systems, Inc. |
41 | * |
42 | * Permission to use, copy, modify, distribute and sell this software |
43 | * and its documentation for any purpose is hereby granted without fee, |
44 | * provided that the above copyright notice appear in all copies and |
45 | * that both that copyright notice and this permission notice appear |
46 | * in supporting documentation. Silicon Graphics makes no |
47 | * representations about the suitability of this software for any |
48 | * purpose. It is provided "as is" without express or implied warranty. |
49 | */ |
50 | |
51 | /** @file bits/stl_deque.h |
52 | * This is an internal header file, included by other library headers. |
53 | * Do not attempt to use it directly. @headername{deque} |
54 | */ |
55 | |
56 | #ifndef _STL_DEQUE_H |
57 | #define _STL_DEQUE_H 1 |
58 | |
59 | #include <bits/concept_check.h> |
60 | #include <bits/stl_iterator_base_types.h> |
61 | #include <bits/stl_iterator_base_funcs.h> |
62 | #if __cplusplus >= 201103L |
63 | #include <initializer_list> |
64 | #include <bits/stl_uninitialized.h> // for __is_bitwise_relocatable |
65 | #endif |
66 | #if __cplusplus > 201703L |
67 | # include <compare> |
68 | #endif |
69 | |
70 | #include <debug/assertions.h> |
71 | |
72 | namespace std _GLIBCXX_VISIBILITY(default) |
73 | { |
74 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
75 | _GLIBCXX_BEGIN_NAMESPACE_CONTAINER |
76 | |
77 | /** |
78 | * @brief This function controls the size of memory nodes. |
79 | * @param __size The size of an element. |
80 | * @return The number (not byte size) of elements per node. |
81 | * |
82 | * This function started off as a compiler kludge from SGI, but |
83 | * seems to be a useful wrapper around a repeated constant |
84 | * expression. The @b 512 is tunable (and no other code needs to |
85 | * change), but no investigation has been done since inheriting the |
86 | * SGI code. Touch _GLIBCXX_DEQUE_BUF_SIZE only if you know what |
87 | * you are doing, however: changing it breaks the binary |
88 | * compatibility!! |
89 | */ |
90 | |
91 | #ifndef _GLIBCXX_DEQUE_BUF_SIZE |
92 | #define _GLIBCXX_DEQUE_BUF_SIZE 512 |
93 | #endif |
94 | |
95 | _GLIBCXX_CONSTEXPR inline size_t |
96 | __deque_buf_size(size_t __size) |
97 | { return (__size < _GLIBCXX_DEQUE_BUF_SIZE |
98 | ? size_t(_GLIBCXX_DEQUE_BUF_SIZE / __size) : size_t(1)); } |
99 | |
100 | |
101 | /** |
102 | * @brief A deque::iterator. |
103 | * |
104 | * Quite a bit of intelligence here. Much of the functionality of |
105 | * deque is actually passed off to this class. A deque holds two |
106 | * of these internally, marking its valid range. Access to |
107 | * elements is done as offsets of either of those two, relying on |
108 | * operator overloading in this class. |
109 | * |
110 | * All the functions are op overloads except for _M_set_node. |
111 | */ |
112 | template<typename _Tp, typename _Ref, typename _Ptr> |
113 | struct _Deque_iterator |
114 | { |
115 | #if __cplusplus < 201103L |
116 | typedef _Deque_iterator<_Tp, _Tp&, _Tp*> iterator; |
117 | typedef _Deque_iterator<_Tp, const _Tp&, const _Tp*> const_iterator; |
118 | typedef _Tp* _Elt_pointer; |
119 | typedef _Tp** _Map_pointer; |
120 | #else |
121 | private: |
122 | template<typename _CvTp> |
123 | using __iter = _Deque_iterator<_Tp, _CvTp&, __ptr_rebind<_Ptr, _CvTp>>; |
124 | public: |
125 | typedef __iter<_Tp> iterator; |
126 | typedef __iter<const _Tp> const_iterator; |
127 | typedef __ptr_rebind<_Ptr, _Tp> _Elt_pointer; |
128 | typedef __ptr_rebind<_Ptr, _Elt_pointer> _Map_pointer; |
129 | #endif |
130 | |
131 | static size_t _S_buffer_size() _GLIBCXX_NOEXCEPT |
132 | { return __deque_buf_size(size: sizeof(_Tp)); } |
133 | |
134 | typedef std::random_access_iterator_tag iterator_category; |
135 | typedef _Tp value_type; |
136 | typedef _Ptr pointer; |
137 | typedef _Ref reference; |
138 | typedef size_t size_type; |
139 | typedef ptrdiff_t difference_type; |
140 | typedef _Deque_iterator _Self; |
141 | |
142 | _Elt_pointer _M_cur; |
143 | _Elt_pointer _M_first; |
144 | _Elt_pointer _M_last; |
145 | _Map_pointer _M_node; |
146 | |
147 | _Deque_iterator(_Elt_pointer __x, _Map_pointer __y) _GLIBCXX_NOEXCEPT |
148 | : _M_cur(__x), _M_first(*__y), |
149 | _M_last(*__y + _S_buffer_size()), _M_node(__y) { } |
150 | |
151 | _Deque_iterator() _GLIBCXX_NOEXCEPT |
152 | : _M_cur(), _M_first(), _M_last(), _M_node() { } |
153 | |
154 | #if __cplusplus < 201103L |
155 | // Conversion from iterator to const_iterator. |
156 | _Deque_iterator(const iterator& __x) _GLIBCXX_NOEXCEPT |
157 | : _M_cur(__x._M_cur), _M_first(__x._M_first), |
158 | _M_last(__x._M_last), _M_node(__x._M_node) { } |
159 | #else |
160 | // Conversion from iterator to const_iterator. |
161 | template<typename _Iter, |
162 | typename = _Require<is_same<_Self, const_iterator>, |
163 | is_same<_Iter, iterator>>> |
164 | _Deque_iterator(const _Iter& __x) noexcept |
165 | : _M_cur(__x._M_cur), _M_first(__x._M_first), |
166 | _M_last(__x._M_last), _M_node(__x._M_node) { } |
167 | |
168 | _Deque_iterator(const _Deque_iterator& __x) noexcept |
169 | : _M_cur(__x._M_cur), _M_first(__x._M_first), |
170 | _M_last(__x._M_last), _M_node(__x._M_node) { } |
171 | |
172 | _Deque_iterator& operator=(const _Deque_iterator&) = default; |
173 | #endif |
174 | |
175 | iterator |
176 | _M_const_cast() const _GLIBCXX_NOEXCEPT |
177 | { return iterator(_M_cur, _M_node); } |
178 | |
179 | reference |
180 | operator*() const _GLIBCXX_NOEXCEPT |
181 | { return *_M_cur; } |
182 | |
183 | pointer |
184 | operator->() const _GLIBCXX_NOEXCEPT |
185 | { return _M_cur; } |
186 | |
187 | _Self& |
188 | operator++() _GLIBCXX_NOEXCEPT |
189 | { |
190 | ++_M_cur; |
191 | if (_M_cur == _M_last) |
192 | { |
193 | _M_set_node(new_node: _M_node + 1); |
194 | _M_cur = _M_first; |
195 | } |
196 | return *this; |
197 | } |
198 | |
199 | _Self |
200 | operator++(int) _GLIBCXX_NOEXCEPT |
201 | { |
202 | _Self __tmp = *this; |
203 | ++*this; |
204 | return __tmp; |
205 | } |
206 | |
207 | _Self& |
208 | operator--() _GLIBCXX_NOEXCEPT |
209 | { |
210 | if (_M_cur == _M_first) |
211 | { |
212 | _M_set_node(new_node: _M_node - 1); |
213 | _M_cur = _M_last; |
214 | } |
215 | --_M_cur; |
216 | return *this; |
217 | } |
218 | |
219 | _Self |
220 | operator--(int) _GLIBCXX_NOEXCEPT |
221 | { |
222 | _Self __tmp = *this; |
223 | --*this; |
224 | return __tmp; |
225 | } |
226 | |
227 | _Self& |
228 | operator+=(difference_type __n) _GLIBCXX_NOEXCEPT |
229 | { |
230 | const difference_type __offset = __n + (_M_cur - _M_first); |
231 | if (__offset >= 0 && __offset < difference_type(_S_buffer_size())) |
232 | _M_cur += __n; |
233 | else |
234 | { |
235 | const difference_type __node_offset = |
236 | __offset > 0 ? __offset / difference_type(_S_buffer_size()) |
237 | : -difference_type((-__offset - 1) |
238 | / _S_buffer_size()) - 1; |
239 | _M_set_node(new_node: _M_node + __node_offset); |
240 | _M_cur = _M_first + (__offset - __node_offset |
241 | * difference_type(_S_buffer_size())); |
242 | } |
243 | return *this; |
244 | } |
245 | |
246 | _Self& |
247 | operator-=(difference_type __n) _GLIBCXX_NOEXCEPT |
248 | { return *this += -__n; } |
249 | |
250 | reference |
251 | operator[](difference_type __n) const _GLIBCXX_NOEXCEPT |
252 | { return *(*this + __n); } |
253 | |
254 | /** |
255 | * Prepares to traverse new_node. Sets everything except |
256 | * _M_cur, which should therefore be set by the caller |
257 | * immediately afterwards, based on _M_first and _M_last. |
258 | */ |
259 | void |
260 | _M_set_node(_Map_pointer __new_node) _GLIBCXX_NOEXCEPT |
261 | { |
262 | _M_node = __new_node; |
263 | _M_first = *__new_node; |
264 | _M_last = _M_first + difference_type(_S_buffer_size()); |
265 | } |
266 | |
267 | friend bool |
268 | operator==(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT |
269 | { return __x._M_cur == __y._M_cur; } |
270 | |
271 | // Note: we also provide overloads whose operands are of the same type in |
272 | // order to avoid ambiguous overload resolution when std::rel_ops |
273 | // operators are in scope (for additional details, see libstdc++/3628) |
274 | template<typename _RefR, typename _PtrR> |
275 | friend bool |
276 | operator==(const _Self& __x, |
277 | const _Deque_iterator<_Tp, _RefR, _PtrR>& __y) |
278 | _GLIBCXX_NOEXCEPT |
279 | { return __x._M_cur == __y._M_cur; } |
280 | |
281 | #if __cpp_lib_three_way_comparison |
282 | friend strong_ordering |
283 | operator<=>(const _Self& __x, const _Self& __y) noexcept |
284 | { |
285 | if (const auto __cmp = __x._M_node <=> __y._M_node; __cmp != 0) |
286 | return __cmp; |
287 | return __x._M_cur <=> __y._M_cur; |
288 | } |
289 | #else |
290 | friend bool |
291 | operator!=(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT |
292 | { return !(__x == __y); } |
293 | |
294 | template<typename _RefR, typename _PtrR> |
295 | friend bool |
296 | operator!=(const _Self& __x, |
297 | const _Deque_iterator<_Tp, _RefR, _PtrR>& __y) |
298 | _GLIBCXX_NOEXCEPT |
299 | { return !(__x == __y); } |
300 | |
301 | friend bool |
302 | operator<(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT |
303 | { |
304 | return (__x._M_node == __y._M_node) |
305 | ? (__x._M_cur < __y._M_cur) : (__x._M_node < __y._M_node); |
306 | } |
307 | |
308 | template<typename _RefR, typename _PtrR> |
309 | friend bool |
310 | operator<(const _Self& __x, |
311 | const _Deque_iterator<_Tp, _RefR, _PtrR>& __y) |
312 | _GLIBCXX_NOEXCEPT |
313 | { |
314 | return (__x._M_node == __y._M_node) |
315 | ? (__x._M_cur < __y._M_cur) : (__x._M_node < __y._M_node); |
316 | } |
317 | |
318 | friend bool |
319 | operator>(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT |
320 | { return __y < __x; } |
321 | |
322 | template<typename _RefR, typename _PtrR> |
323 | friend bool |
324 | operator>(const _Self& __x, |
325 | const _Deque_iterator<_Tp, _RefR, _PtrR>& __y) |
326 | _GLIBCXX_NOEXCEPT |
327 | { return __y < __x; } |
328 | |
329 | friend bool |
330 | operator<=(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT |
331 | { return !(__y < __x); } |
332 | |
333 | template<typename _RefR, typename _PtrR> |
334 | friend bool |
335 | operator<=(const _Self& __x, |
336 | const _Deque_iterator<_Tp, _RefR, _PtrR>& __y) |
337 | _GLIBCXX_NOEXCEPT |
338 | { return !(__y < __x); } |
339 | |
340 | friend bool |
341 | operator>=(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT |
342 | { return !(__x < __y); } |
343 | |
344 | template<typename _RefR, typename _PtrR> |
345 | friend bool |
346 | operator>=(const _Self& __x, |
347 | const _Deque_iterator<_Tp, _RefR, _PtrR>& __y) |
348 | _GLIBCXX_NOEXCEPT |
349 | { return !(__x < __y); } |
350 | #endif // three-way comparison |
351 | |
352 | friend difference_type |
353 | operator-(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT |
354 | { |
355 | return difference_type(_S_buffer_size()) |
356 | * (__x._M_node - __y._M_node - bool(__x._M_node)) |
357 | + (__x._M_cur - __x._M_first) |
358 | + (__y._M_last - __y._M_cur); |
359 | } |
360 | |
361 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
362 | // According to the resolution of DR179 not only the various comparison |
363 | // operators but also operator- must accept mixed iterator/const_iterator |
364 | // parameters. |
365 | template<typename _RefR, typename _PtrR> |
366 | friend difference_type |
367 | operator-(const _Self& __x, |
368 | const _Deque_iterator<_Tp, _RefR, _PtrR>& __y) |
369 | _GLIBCXX_NOEXCEPT |
370 | { |
371 | return difference_type(_S_buffer_size()) |
372 | * (__x._M_node - __y._M_node - bool(__x._M_node)) |
373 | + (__x._M_cur - __x._M_first) |
374 | + (__y._M_last - __y._M_cur); |
375 | } |
376 | |
377 | friend _Self |
378 | operator+(const _Self& __x, difference_type __n) _GLIBCXX_NOEXCEPT |
379 | { |
380 | _Self __tmp = __x; |
381 | __tmp += __n; |
382 | return __tmp; |
383 | } |
384 | |
385 | friend _Self |
386 | operator-(const _Self& __x, difference_type __n) _GLIBCXX_NOEXCEPT |
387 | { |
388 | _Self __tmp = __x; |
389 | __tmp -= __n; |
390 | return __tmp; |
391 | } |
392 | |
393 | friend _Self |
394 | operator+(difference_type __n, const _Self& __x) _GLIBCXX_NOEXCEPT |
395 | { return __x + __n; } |
396 | }; |
397 | |
398 | /** |
399 | * Deque base class. This class provides the unified face for %deque's |
400 | * allocation. This class's constructor and destructor allocate and |
401 | * deallocate (but do not initialize) storage. This makes %exception |
402 | * safety easier. |
403 | * |
404 | * Nothing in this class ever constructs or destroys an actual Tp element. |
405 | * (Deque handles that itself.) Only/All memory management is performed |
406 | * here. |
407 | */ |
408 | template<typename _Tp, typename _Alloc> |
409 | class _Deque_base |
410 | { |
411 | protected: |
412 | typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template |
413 | rebind<_Tp>::other _Tp_alloc_type; |
414 | typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Alloc_traits; |
415 | |
416 | #if __cplusplus < 201103L |
417 | typedef _Tp* _Ptr; |
418 | typedef const _Tp* _Ptr_const; |
419 | #else |
420 | typedef typename _Alloc_traits::pointer _Ptr; |
421 | typedef typename _Alloc_traits::const_pointer _Ptr_const; |
422 | #endif |
423 | |
424 | typedef typename _Alloc_traits::template rebind<_Ptr>::other |
425 | _Map_alloc_type; |
426 | typedef __gnu_cxx::__alloc_traits<_Map_alloc_type> _Map_alloc_traits; |
427 | |
428 | typedef _Alloc allocator_type; |
429 | |
430 | allocator_type |
431 | get_allocator() const _GLIBCXX_NOEXCEPT |
432 | { return allocator_type(_M_get_Tp_allocator()); } |
433 | |
434 | typedef _Deque_iterator<_Tp, _Tp&, _Ptr> iterator; |
435 | typedef _Deque_iterator<_Tp, const _Tp&, _Ptr_const> const_iterator; |
436 | |
437 | _Deque_base() |
438 | : _M_impl() |
439 | { _M_initialize_map(0); } |
440 | |
441 | _Deque_base(size_t __num_elements) |
442 | : _M_impl() |
443 | { _M_initialize_map(__num_elements); } |
444 | |
445 | _Deque_base(const allocator_type& __a, size_t __num_elements) |
446 | : _M_impl(__a) |
447 | { _M_initialize_map(__num_elements); } |
448 | |
449 | _Deque_base(const allocator_type& __a) |
450 | : _M_impl(__a) |
451 | { /* Caller must initialize map. */ } |
452 | |
453 | #if __cplusplus >= 201103L |
454 | _Deque_base(_Deque_base&& __x) |
455 | : _M_impl(std::move(__x._M_get_Tp_allocator())) |
456 | { |
457 | _M_initialize_map(0); |
458 | if (__x._M_impl._M_map) |
459 | this->_M_impl._M_swap_data(__x._M_impl); |
460 | } |
461 | |
462 | _Deque_base(_Deque_base&& __x, const allocator_type& __a) |
463 | : _M_impl(std::move(__x._M_impl), _Tp_alloc_type(__a)) |
464 | { __x._M_initialize_map(0); } |
465 | |
466 | _Deque_base(_Deque_base&& __x, const allocator_type& __a, size_t __n) |
467 | : _M_impl(__a) |
468 | { |
469 | if (__x.get_allocator() == __a) |
470 | { |
471 | if (__x._M_impl._M_map) |
472 | { |
473 | _M_initialize_map(0); |
474 | this->_M_impl._M_swap_data(__x._M_impl); |
475 | } |
476 | } |
477 | else |
478 | { |
479 | _M_initialize_map(__n); |
480 | } |
481 | } |
482 | #endif |
483 | |
484 | ~_Deque_base() _GLIBCXX_NOEXCEPT; |
485 | |
486 | typedef typename iterator::_Map_pointer _Map_pointer; |
487 | |
488 | struct _Deque_impl_data |
489 | { |
490 | _Map_pointer _M_map; |
491 | size_t _M_map_size; |
492 | iterator _M_start; |
493 | iterator _M_finish; |
494 | |
495 | _Deque_impl_data() _GLIBCXX_NOEXCEPT |
496 | : _M_map(), _M_map_size(), _M_start(), _M_finish() |
497 | { } |
498 | |
499 | #if __cplusplus >= 201103L |
500 | _Deque_impl_data(const _Deque_impl_data&) = default; |
501 | _Deque_impl_data& |
502 | operator=(const _Deque_impl_data&) = default; |
503 | |
504 | _Deque_impl_data(_Deque_impl_data&& __x) noexcept |
505 | : _Deque_impl_data(__x) |
506 | { __x = _Deque_impl_data(); } |
507 | #endif |
508 | |
509 | void |
510 | _M_swap_data(_Deque_impl_data& __x) _GLIBCXX_NOEXCEPT |
511 | { |
512 | // Do not use std::swap(_M_start, __x._M_start), etc as it loses |
513 | // information used by TBAA. |
514 | std::swap(*this, __x); |
515 | } |
516 | }; |
517 | |
518 | // This struct encapsulates the implementation of the std::deque |
519 | // standard container and at the same time makes use of the EBO |
520 | // for empty allocators. |
521 | struct _Deque_impl |
522 | : public _Tp_alloc_type, public _Deque_impl_data |
523 | { |
524 | _Deque_impl() _GLIBCXX_NOEXCEPT_IF( |
525 | is_nothrow_default_constructible<_Tp_alloc_type>::value) |
526 | : _Tp_alloc_type() |
527 | { } |
528 | |
529 | _Deque_impl(const _Tp_alloc_type& __a) _GLIBCXX_NOEXCEPT |
530 | : _Tp_alloc_type(__a) |
531 | { } |
532 | |
533 | #if __cplusplus >= 201103L |
534 | _Deque_impl(_Deque_impl&&) = default; |
535 | |
536 | _Deque_impl(_Tp_alloc_type&& __a) noexcept |
537 | : _Tp_alloc_type(std::move(__a)) |
538 | { } |
539 | |
540 | _Deque_impl(_Deque_impl&& __d, _Tp_alloc_type&& __a) |
541 | : _Tp_alloc_type(std::move(__a)), _Deque_impl_data(std::move(__d)) |
542 | { } |
543 | #endif |
544 | }; |
545 | |
546 | _Tp_alloc_type& |
547 | _M_get_Tp_allocator() _GLIBCXX_NOEXCEPT |
548 | { return this->_M_impl; } |
549 | |
550 | const _Tp_alloc_type& |
551 | _M_get_Tp_allocator() const _GLIBCXX_NOEXCEPT |
552 | { return this->_M_impl; } |
553 | |
554 | _Map_alloc_type |
555 | _M_get_map_allocator() const _GLIBCXX_NOEXCEPT |
556 | { return _Map_alloc_type(_M_get_Tp_allocator()); } |
557 | |
558 | _Ptr |
559 | _M_allocate_node() |
560 | { |
561 | typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Traits; |
562 | return _Traits::allocate(_M_impl, __deque_buf_size(size: sizeof(_Tp))); |
563 | } |
564 | |
565 | void |
566 | _M_deallocate_node(_Ptr __p) _GLIBCXX_NOEXCEPT |
567 | { |
568 | typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Traits; |
569 | _Traits::deallocate(_M_impl, __p, __deque_buf_size(size: sizeof(_Tp))); |
570 | } |
571 | |
572 | _Map_pointer |
573 | _M_allocate_map(size_t __n) |
574 | { |
575 | _Map_alloc_type __map_alloc = _M_get_map_allocator(); |
576 | return _Map_alloc_traits::allocate(__map_alloc, __n); |
577 | } |
578 | |
579 | void |
580 | _M_deallocate_map(_Map_pointer __p, size_t __n) _GLIBCXX_NOEXCEPT |
581 | { |
582 | _Map_alloc_type __map_alloc = _M_get_map_allocator(); |
583 | _Map_alloc_traits::deallocate(__map_alloc, __p, __n); |
584 | } |
585 | |
586 | void _M_initialize_map(size_t); |
587 | void _M_create_nodes(_Map_pointer __nstart, _Map_pointer __nfinish); |
588 | void _M_destroy_nodes(_Map_pointer __nstart, |
589 | _Map_pointer __nfinish) _GLIBCXX_NOEXCEPT; |
590 | enum { _S_initial_map_size = 8 }; |
591 | |
592 | _Deque_impl _M_impl; |
593 | }; |
594 | |
595 | template<typename _Tp, typename _Alloc> |
596 | _Deque_base<_Tp, _Alloc>:: |
597 | ~_Deque_base() _GLIBCXX_NOEXCEPT |
598 | { |
599 | if (this->_M_impl._M_map) |
600 | { |
601 | _M_destroy_nodes(nstart: this->_M_impl._M_start._M_node, |
602 | nfinish: this->_M_impl._M_finish._M_node + 1); |
603 | _M_deallocate_map(p: this->_M_impl._M_map, n: this->_M_impl._M_map_size); |
604 | } |
605 | } |
606 | |
607 | /** |
608 | * @brief Layout storage. |
609 | * @param __num_elements The count of T's for which to allocate space |
610 | * at first. |
611 | * @return Nothing. |
612 | * |
613 | * The initial underlying memory layout is a bit complicated... |
614 | */ |
615 | template<typename _Tp, typename _Alloc> |
616 | void |
617 | _Deque_base<_Tp, _Alloc>:: |
618 | _M_initialize_map(size_t __num_elements) |
619 | { |
620 | const size_t __num_nodes = (__num_elements / __deque_buf_size(size: sizeof(_Tp)) |
621 | + 1); |
622 | |
623 | this->_M_impl._M_map_size = std::max(a: (size_t) _S_initial_map_size, |
624 | b: size_t(__num_nodes + 2)); |
625 | this->_M_impl._M_map = _M_allocate_map(n: this->_M_impl._M_map_size); |
626 | |
627 | // For "small" maps (needing less than _M_map_size nodes), allocation |
628 | // starts in the middle elements and grows outwards. So nstart may be |
629 | // the beginning of _M_map, but for small maps it may be as far in as |
630 | // _M_map+3. |
631 | |
632 | _Map_pointer __nstart = (this->_M_impl._M_map |
633 | + (this->_M_impl._M_map_size - __num_nodes) / 2); |
634 | _Map_pointer __nfinish = __nstart + __num_nodes; |
635 | |
636 | __try |
637 | { _M_create_nodes(__nstart, __nfinish); } |
638 | __catch(...) |
639 | { |
640 | _M_deallocate_map(p: this->_M_impl._M_map, n: this->_M_impl._M_map_size); |
641 | this->_M_impl._M_map = _Map_pointer(); |
642 | this->_M_impl._M_map_size = 0; |
643 | __throw_exception_again; |
644 | } |
645 | |
646 | this->_M_impl._M_start._M_set_node(__nstart); |
647 | this->_M_impl._M_finish._M_set_node(__nfinish - 1); |
648 | this->_M_impl._M_start._M_cur = _M_impl._M_start._M_first; |
649 | this->_M_impl._M_finish._M_cur = (this->_M_impl._M_finish._M_first |
650 | + __num_elements |
651 | % __deque_buf_size(size: sizeof(_Tp))); |
652 | } |
653 | |
654 | template<typename _Tp, typename _Alloc> |
655 | void |
656 | _Deque_base<_Tp, _Alloc>:: |
657 | _M_create_nodes(_Map_pointer __nstart, _Map_pointer __nfinish) |
658 | { |
659 | _Map_pointer __cur; |
660 | __try |
661 | { |
662 | for (__cur = __nstart; __cur < __nfinish; ++__cur) |
663 | *__cur = this->_M_allocate_node(); |
664 | } |
665 | __catch(...) |
666 | { |
667 | _M_destroy_nodes(__nstart, nfinish: __cur); |
668 | __throw_exception_again; |
669 | } |
670 | } |
671 | |
672 | template<typename _Tp, typename _Alloc> |
673 | void |
674 | _Deque_base<_Tp, _Alloc>:: |
675 | _M_destroy_nodes(_Map_pointer __nstart, |
676 | _Map_pointer __nfinish) _GLIBCXX_NOEXCEPT |
677 | { |
678 | for (_Map_pointer __n = __nstart; __n < __nfinish; ++__n) |
679 | _M_deallocate_node(p: *__n); |
680 | } |
681 | |
682 | /** |
683 | * @brief A standard container using fixed-size memory allocation and |
684 | * constant-time manipulation of elements at either end. |
685 | * |
686 | * @ingroup sequences |
687 | * |
688 | * @tparam _Tp Type of element. |
689 | * @tparam _Alloc Allocator type, defaults to allocator<_Tp>. |
690 | * |
691 | * Meets the requirements of a <a href="tables.html#65">container</a>, a |
692 | * <a href="tables.html#66">reversible container</a>, and a |
693 | * <a href="tables.html#67">sequence</a>, including the |
694 | * <a href="tables.html#68">optional sequence requirements</a>. |
695 | * |
696 | * In previous HP/SGI versions of deque, there was an extra template |
697 | * parameter so users could control the node size. This extension turned |
698 | * out to violate the C++ standard (it can be detected using template |
699 | * template parameters), and it was removed. |
700 | * |
701 | * Here's how a deque<Tp> manages memory. Each deque has 4 members: |
702 | * |
703 | * - Tp** _M_map |
704 | * - size_t _M_map_size |
705 | * - iterator _M_start, _M_finish |
706 | * |
707 | * map_size is at least 8. %map is an array of map_size |
708 | * pointers-to-@a nodes. (The name %map has nothing to do with the |
709 | * std::map class, and @b nodes should not be confused with |
710 | * std::list's usage of @a node.) |
711 | * |
712 | * A @a node has no specific type name as such, but it is referred |
713 | * to as @a node in this file. It is a simple array-of-Tp. If Tp |
714 | * is very large, there will be one Tp element per node (i.e., an |
715 | * @a array of one). For non-huge Tp's, node size is inversely |
716 | * related to Tp size: the larger the Tp, the fewer Tp's will fit |
717 | * in a node. The goal here is to keep the total size of a node |
718 | * relatively small and constant over different Tp's, to improve |
719 | * allocator efficiency. |
720 | * |
721 | * Not every pointer in the %map array will point to a node. If |
722 | * the initial number of elements in the deque is small, the |
723 | * /middle/ %map pointers will be valid, and the ones at the edges |
724 | * will be unused. This same situation will arise as the %map |
725 | * grows: available %map pointers, if any, will be on the ends. As |
726 | * new nodes are created, only a subset of the %map's pointers need |
727 | * to be copied @a outward. |
728 | * |
729 | * Class invariants: |
730 | * - For any nonsingular iterator i: |
731 | * - i.node points to a member of the %map array. (Yes, you read that |
732 | * correctly: i.node does not actually point to a node.) The member of |
733 | * the %map array is what actually points to the node. |
734 | * - i.first == *(i.node) (This points to the node (first Tp element).) |
735 | * - i.last == i.first + node_size |
736 | * - i.cur is a pointer in the range [i.first, i.last). NOTE: |
737 | * the implication of this is that i.cur is always a dereferenceable |
738 | * pointer, even if i is a past-the-end iterator. |
739 | * - Start and Finish are always nonsingular iterators. NOTE: this |
740 | * means that an empty deque must have one node, a deque with <N |
741 | * elements (where N is the node buffer size) must have one node, a |
742 | * deque with N through (2N-1) elements must have two nodes, etc. |
743 | * - For every node other than start.node and finish.node, every |
744 | * element in the node is an initialized object. If start.node == |
745 | * finish.node, then [start.cur, finish.cur) are initialized |
746 | * objects, and the elements outside that range are uninitialized |
747 | * storage. Otherwise, [start.cur, start.last) and [finish.first, |
748 | * finish.cur) are initialized objects, and [start.first, start.cur) |
749 | * and [finish.cur, finish.last) are uninitialized storage. |
750 | * - [%map, %map + map_size) is a valid, non-empty range. |
751 | * - [start.node, finish.node] is a valid range contained within |
752 | * [%map, %map + map_size). |
753 | * - A pointer in the range [%map, %map + map_size) points to an allocated |
754 | * node if and only if the pointer is in the range |
755 | * [start.node, finish.node]. |
756 | * |
757 | * Here's the magic: nothing in deque is @b aware of the discontiguous |
758 | * storage! |
759 | * |
760 | * The memory setup and layout occurs in the parent, _Base, and the iterator |
761 | * class is entirely responsible for @a leaping from one node to the next. |
762 | * All the implementation routines for deque itself work only through the |
763 | * start and finish iterators. This keeps the routines simple and sane, |
764 | * and we can use other standard algorithms as well. |
765 | */ |
766 | template<typename _Tp, typename _Alloc = std::allocator<_Tp> > |
767 | class deque : protected _Deque_base<_Tp, _Alloc> |
768 | { |
769 | #ifdef _GLIBCXX_CONCEPT_CHECKS |
770 | // concept requirements |
771 | typedef typename _Alloc::value_type _Alloc_value_type; |
772 | # if __cplusplus < 201103L |
773 | __glibcxx_class_requires(_Tp, _SGIAssignableConcept) |
774 | # endif |
775 | __glibcxx_class_requires2(_Tp, _Alloc_value_type, _SameTypeConcept) |
776 | #endif |
777 | |
778 | #if __cplusplus >= 201103L |
779 | static_assert(is_same<typename remove_cv<_Tp>::type, _Tp>::value, |
780 | "std::deque must have a non-const, non-volatile value_type" ); |
781 | # if __cplusplus > 201703L || defined __STRICT_ANSI__ |
782 | static_assert(is_same<typename _Alloc::value_type, _Tp>::value, |
783 | "std::deque must have the same value_type as its allocator" ); |
784 | # endif |
785 | #endif |
786 | |
787 | typedef _Deque_base<_Tp, _Alloc> _Base; |
788 | typedef typename _Base::_Tp_alloc_type _Tp_alloc_type; |
789 | typedef typename _Base::_Alloc_traits _Alloc_traits; |
790 | typedef typename _Base::_Map_pointer _Map_pointer; |
791 | |
792 | public: |
793 | typedef _Tp value_type; |
794 | typedef typename _Alloc_traits::pointer pointer; |
795 | typedef typename _Alloc_traits::const_pointer const_pointer; |
796 | typedef typename _Alloc_traits::reference reference; |
797 | typedef typename _Alloc_traits::const_reference const_reference; |
798 | typedef typename _Base::iterator iterator; |
799 | typedef typename _Base::const_iterator const_iterator; |
800 | typedef std::reverse_iterator<const_iterator> const_reverse_iterator; |
801 | typedef std::reverse_iterator<iterator> reverse_iterator; |
802 | typedef size_t size_type; |
803 | typedef ptrdiff_t difference_type; |
804 | typedef _Alloc allocator_type; |
805 | |
806 | private: |
807 | static size_t _S_buffer_size() _GLIBCXX_NOEXCEPT |
808 | { return __deque_buf_size(size: sizeof(_Tp)); } |
809 | |
810 | // Functions controlling memory layout, and nothing else. |
811 | using _Base::_M_initialize_map; |
812 | using _Base::_M_create_nodes; |
813 | using _Base::_M_destroy_nodes; |
814 | using _Base::_M_allocate_node; |
815 | using _Base::_M_deallocate_node; |
816 | using _Base::_M_allocate_map; |
817 | using _Base::_M_deallocate_map; |
818 | using _Base::_M_get_Tp_allocator; |
819 | |
820 | /** |
821 | * A total of four data members accumulated down the hierarchy. |
822 | * May be accessed via _M_impl.* |
823 | */ |
824 | using _Base::_M_impl; |
825 | |
826 | public: |
827 | // [23.2.1.1] construct/copy/destroy |
828 | // (assign() and get_allocator() are also listed in this section) |
829 | |
830 | /** |
831 | * @brief Creates a %deque with no elements. |
832 | */ |
833 | #if __cplusplus >= 201103L |
834 | deque() = default; |
835 | #else |
836 | deque() { } |
837 | #endif |
838 | |
839 | /** |
840 | * @brief Creates a %deque with no elements. |
841 | * @param __a An allocator object. |
842 | */ |
843 | explicit |
844 | deque(const allocator_type& __a) |
845 | : _Base(__a, 0) { } |
846 | |
847 | #if __cplusplus >= 201103L |
848 | /** |
849 | * @brief Creates a %deque with default constructed elements. |
850 | * @param __n The number of elements to initially create. |
851 | * @param __a An allocator. |
852 | * |
853 | * This constructor fills the %deque with @a n default |
854 | * constructed elements. |
855 | */ |
856 | explicit |
857 | deque(size_type __n, const allocator_type& __a = allocator_type()) |
858 | : _Base(__a, _S_check_init_len(__n, __a)) |
859 | { _M_default_initialize(); } |
860 | |
861 | /** |
862 | * @brief Creates a %deque with copies of an exemplar element. |
863 | * @param __n The number of elements to initially create. |
864 | * @param __value An element to copy. |
865 | * @param __a An allocator. |
866 | * |
867 | * This constructor fills the %deque with @a __n copies of @a __value. |
868 | */ |
869 | deque(size_type __n, const value_type& __value, |
870 | const allocator_type& __a = allocator_type()) |
871 | : _Base(__a, _S_check_init_len(__n, __a)) |
872 | { _M_fill_initialize(__value); } |
873 | #else |
874 | /** |
875 | * @brief Creates a %deque with copies of an exemplar element. |
876 | * @param __n The number of elements to initially create. |
877 | * @param __value An element to copy. |
878 | * @param __a An allocator. |
879 | * |
880 | * This constructor fills the %deque with @a __n copies of @a __value. |
881 | */ |
882 | explicit |
883 | deque(size_type __n, const value_type& __value = value_type(), |
884 | const allocator_type& __a = allocator_type()) |
885 | : _Base(__a, _S_check_init_len(__n, __a)) |
886 | { _M_fill_initialize(__value); } |
887 | #endif |
888 | |
889 | /** |
890 | * @brief %Deque copy constructor. |
891 | * @param __x A %deque of identical element and allocator types. |
892 | * |
893 | * The newly-created %deque uses a copy of the allocator object used |
894 | * by @a __x (unless the allocator traits dictate a different object). |
895 | */ |
896 | deque(const deque& __x) |
897 | : _Base(_Alloc_traits::_S_select_on_copy(__x._M_get_Tp_allocator()), |
898 | __x.size()) |
899 | { std::__uninitialized_copy_a(__x.begin(), __x.end(), |
900 | this->_M_impl._M_start, |
901 | _M_get_Tp_allocator()); } |
902 | |
903 | #if __cplusplus >= 201103L |
904 | /** |
905 | * @brief %Deque move constructor. |
906 | * |
907 | * The newly-created %deque contains the exact contents of the |
908 | * moved instance. |
909 | * The contents of the moved instance are a valid, but unspecified |
910 | * %deque. |
911 | */ |
912 | deque(deque&&) = default; |
913 | |
914 | /// Copy constructor with alternative allocator |
915 | deque(const deque& __x, const allocator_type& __a) |
916 | : _Base(__a, __x.size()) |
917 | { std::__uninitialized_copy_a(__x.begin(), __x.end(), |
918 | this->_M_impl._M_start, |
919 | _M_get_Tp_allocator()); } |
920 | |
921 | /// Move constructor with alternative allocator |
922 | deque(deque&& __x, const allocator_type& __a) |
923 | : deque(std::move(__x), __a, typename _Alloc_traits::is_always_equal{}) |
924 | { } |
925 | |
926 | private: |
927 | deque(deque&& __x, const allocator_type& __a, true_type) |
928 | : _Base(std::move(__x), __a) |
929 | { } |
930 | |
931 | deque(deque&& __x, const allocator_type& __a, false_type) |
932 | : _Base(std::move(__x), __a, __x.size()) |
933 | { |
934 | if (__x.get_allocator() != __a && !__x.empty()) |
935 | { |
936 | std::__uninitialized_move_a(__x.begin(), __x.end(), |
937 | this->_M_impl._M_start, |
938 | _M_get_Tp_allocator()); |
939 | __x.clear(); |
940 | } |
941 | } |
942 | |
943 | public: |
944 | /** |
945 | * @brief Builds a %deque from an initializer list. |
946 | * @param __l An initializer_list. |
947 | * @param __a An allocator object. |
948 | * |
949 | * Create a %deque consisting of copies of the elements in the |
950 | * initializer_list @a __l. |
951 | * |
952 | * This will call the element type's copy constructor N times |
953 | * (where N is __l.size()) and do no memory reallocation. |
954 | */ |
955 | deque(initializer_list<value_type> __l, |
956 | const allocator_type& __a = allocator_type()) |
957 | : _Base(__a) |
958 | { |
959 | _M_range_initialize(__l.begin(), __l.end(), |
960 | random_access_iterator_tag()); |
961 | } |
962 | #endif |
963 | |
964 | /** |
965 | * @brief Builds a %deque from a range. |
966 | * @param __first An input iterator. |
967 | * @param __last An input iterator. |
968 | * @param __a An allocator object. |
969 | * |
970 | * Create a %deque consisting of copies of the elements from [__first, |
971 | * __last). |
972 | * |
973 | * If the iterators are forward, bidirectional, or random-access, then |
974 | * this will call the elements' copy constructor N times (where N is |
975 | * distance(__first,__last)) and do no memory reallocation. But if only |
976 | * input iterators are used, then this will do at most 2N calls to the |
977 | * copy constructor, and logN memory reallocations. |
978 | */ |
979 | #if __cplusplus >= 201103L |
980 | template<typename _InputIterator, |
981 | typename = std::_RequireInputIter<_InputIterator>> |
982 | deque(_InputIterator __first, _InputIterator __last, |
983 | const allocator_type& __a = allocator_type()) |
984 | : _Base(__a) |
985 | { |
986 | _M_range_initialize(__first, __last, |
987 | std::__iterator_category(__first)); |
988 | } |
989 | #else |
990 | template<typename _InputIterator> |
991 | deque(_InputIterator __first, _InputIterator __last, |
992 | const allocator_type& __a = allocator_type()) |
993 | : _Base(__a) |
994 | { |
995 | // Check whether it's an integral type. If so, it's not an iterator. |
996 | typedef typename std::__is_integer<_InputIterator>::__type _Integral; |
997 | _M_initialize_dispatch(__first, __last, _Integral()); |
998 | } |
999 | #endif |
1000 | |
1001 | /** |
1002 | * The dtor only erases the elements, and note that if the elements |
1003 | * themselves are pointers, the pointed-to memory is not touched in any |
1004 | * way. Managing the pointer is the user's responsibility. |
1005 | */ |
1006 | ~deque() |
1007 | { _M_destroy_data(begin(), end(), _M_get_Tp_allocator()); } |
1008 | |
1009 | /** |
1010 | * @brief %Deque assignment operator. |
1011 | * @param __x A %deque of identical element and allocator types. |
1012 | * |
1013 | * All the elements of @a x are copied. |
1014 | * |
1015 | * The newly-created %deque uses a copy of the allocator object used |
1016 | * by @a __x (unless the allocator traits dictate a different object). |
1017 | */ |
1018 | deque& |
1019 | operator=(const deque& __x); |
1020 | |
1021 | #if __cplusplus >= 201103L |
1022 | /** |
1023 | * @brief %Deque move assignment operator. |
1024 | * @param __x A %deque of identical element and allocator types. |
1025 | * |
1026 | * The contents of @a __x are moved into this deque (without copying, |
1027 | * if the allocators permit it). |
1028 | * @a __x is a valid, but unspecified %deque. |
1029 | */ |
1030 | deque& |
1031 | operator=(deque&& __x) noexcept(_Alloc_traits::_S_always_equal()) |
1032 | { |
1033 | using __always_equal = typename _Alloc_traits::is_always_equal; |
1034 | _M_move_assign1(std::move(__x), __always_equal{}); |
1035 | return *this; |
1036 | } |
1037 | |
1038 | /** |
1039 | * @brief Assigns an initializer list to a %deque. |
1040 | * @param __l An initializer_list. |
1041 | * |
1042 | * This function fills a %deque with copies of the elements in the |
1043 | * initializer_list @a __l. |
1044 | * |
1045 | * Note that the assignment completely changes the %deque and that the |
1046 | * resulting %deque's size is the same as the number of elements |
1047 | * assigned. |
1048 | */ |
1049 | deque& |
1050 | operator=(initializer_list<value_type> __l) |
1051 | { |
1052 | _M_assign_aux(__l.begin(), __l.end(), |
1053 | random_access_iterator_tag()); |
1054 | return *this; |
1055 | } |
1056 | #endif |
1057 | |
1058 | /** |
1059 | * @brief Assigns a given value to a %deque. |
1060 | * @param __n Number of elements to be assigned. |
1061 | * @param __val Value to be assigned. |
1062 | * |
1063 | * This function fills a %deque with @a n copies of the given |
1064 | * value. Note that the assignment completely changes the |
1065 | * %deque and that the resulting %deque's size is the same as |
1066 | * the number of elements assigned. |
1067 | */ |
1068 | void |
1069 | assign(size_type __n, const value_type& __val) |
1070 | { _M_fill_assign(__n, __val); } |
1071 | |
1072 | /** |
1073 | * @brief Assigns a range to a %deque. |
1074 | * @param __first An input iterator. |
1075 | * @param __last An input iterator. |
1076 | * |
1077 | * This function fills a %deque with copies of the elements in the |
1078 | * range [__first,__last). |
1079 | * |
1080 | * Note that the assignment completely changes the %deque and that the |
1081 | * resulting %deque's size is the same as the number of elements |
1082 | * assigned. |
1083 | */ |
1084 | #if __cplusplus >= 201103L |
1085 | template<typename _InputIterator, |
1086 | typename = std::_RequireInputIter<_InputIterator>> |
1087 | void |
1088 | assign(_InputIterator __first, _InputIterator __last) |
1089 | { _M_assign_aux(__first, __last, std::__iterator_category(__first)); } |
1090 | #else |
1091 | template<typename _InputIterator> |
1092 | void |
1093 | assign(_InputIterator __first, _InputIterator __last) |
1094 | { |
1095 | typedef typename std::__is_integer<_InputIterator>::__type _Integral; |
1096 | _M_assign_dispatch(__first, __last, _Integral()); |
1097 | } |
1098 | #endif |
1099 | |
1100 | #if __cplusplus >= 201103L |
1101 | /** |
1102 | * @brief Assigns an initializer list to a %deque. |
1103 | * @param __l An initializer_list. |
1104 | * |
1105 | * This function fills a %deque with copies of the elements in the |
1106 | * initializer_list @a __l. |
1107 | * |
1108 | * Note that the assignment completely changes the %deque and that the |
1109 | * resulting %deque's size is the same as the number of elements |
1110 | * assigned. |
1111 | */ |
1112 | void |
1113 | assign(initializer_list<value_type> __l) |
1114 | { _M_assign_aux(__l.begin(), __l.end(), random_access_iterator_tag()); } |
1115 | #endif |
1116 | |
1117 | /// Get a copy of the memory allocation object. |
1118 | allocator_type |
1119 | get_allocator() const _GLIBCXX_NOEXCEPT |
1120 | { return _Base::get_allocator(); } |
1121 | |
1122 | // iterators |
1123 | /** |
1124 | * Returns a read/write iterator that points to the first element in the |
1125 | * %deque. Iteration is done in ordinary element order. |
1126 | */ |
1127 | iterator |
1128 | begin() _GLIBCXX_NOEXCEPT |
1129 | { return this->_M_impl._M_start; } |
1130 | |
1131 | /** |
1132 | * Returns a read-only (constant) iterator that points to the first |
1133 | * element in the %deque. Iteration is done in ordinary element order. |
1134 | */ |
1135 | const_iterator |
1136 | begin() const _GLIBCXX_NOEXCEPT |
1137 | { return this->_M_impl._M_start; } |
1138 | |
1139 | /** |
1140 | * Returns a read/write iterator that points one past the last |
1141 | * element in the %deque. Iteration is done in ordinary |
1142 | * element order. |
1143 | */ |
1144 | iterator |
1145 | end() _GLIBCXX_NOEXCEPT |
1146 | { return this->_M_impl._M_finish; } |
1147 | |
1148 | /** |
1149 | * Returns a read-only (constant) iterator that points one past |
1150 | * the last element in the %deque. Iteration is done in |
1151 | * ordinary element order. |
1152 | */ |
1153 | const_iterator |
1154 | end() const _GLIBCXX_NOEXCEPT |
1155 | { return this->_M_impl._M_finish; } |
1156 | |
1157 | /** |
1158 | * Returns a read/write reverse iterator that points to the |
1159 | * last element in the %deque. Iteration is done in reverse |
1160 | * element order. |
1161 | */ |
1162 | reverse_iterator |
1163 | rbegin() _GLIBCXX_NOEXCEPT |
1164 | { return reverse_iterator(this->_M_impl._M_finish); } |
1165 | |
1166 | /** |
1167 | * Returns a read-only (constant) reverse iterator that points |
1168 | * to the last element in the %deque. Iteration is done in |
1169 | * reverse element order. |
1170 | */ |
1171 | const_reverse_iterator |
1172 | rbegin() const _GLIBCXX_NOEXCEPT |
1173 | { return const_reverse_iterator(this->_M_impl._M_finish); } |
1174 | |
1175 | /** |
1176 | * Returns a read/write reverse iterator that points to one |
1177 | * before the first element in the %deque. Iteration is done |
1178 | * in reverse element order. |
1179 | */ |
1180 | reverse_iterator |
1181 | rend() _GLIBCXX_NOEXCEPT |
1182 | { return reverse_iterator(this->_M_impl._M_start); } |
1183 | |
1184 | /** |
1185 | * Returns a read-only (constant) reverse iterator that points |
1186 | * to one before the first element in the %deque. Iteration is |
1187 | * done in reverse element order. |
1188 | */ |
1189 | const_reverse_iterator |
1190 | rend() const _GLIBCXX_NOEXCEPT |
1191 | { return const_reverse_iterator(this->_M_impl._M_start); } |
1192 | |
1193 | #if __cplusplus >= 201103L |
1194 | /** |
1195 | * Returns a read-only (constant) iterator that points to the first |
1196 | * element in the %deque. Iteration is done in ordinary element order. |
1197 | */ |
1198 | const_iterator |
1199 | cbegin() const noexcept |
1200 | { return this->_M_impl._M_start; } |
1201 | |
1202 | /** |
1203 | * Returns a read-only (constant) iterator that points one past |
1204 | * the last element in the %deque. Iteration is done in |
1205 | * ordinary element order. |
1206 | */ |
1207 | const_iterator |
1208 | cend() const noexcept |
1209 | { return this->_M_impl._M_finish; } |
1210 | |
1211 | /** |
1212 | * Returns a read-only (constant) reverse iterator that points |
1213 | * to the last element in the %deque. Iteration is done in |
1214 | * reverse element order. |
1215 | */ |
1216 | const_reverse_iterator |
1217 | crbegin() const noexcept |
1218 | { return const_reverse_iterator(this->_M_impl._M_finish); } |
1219 | |
1220 | /** |
1221 | * Returns a read-only (constant) reverse iterator that points |
1222 | * to one before the first element in the %deque. Iteration is |
1223 | * done in reverse element order. |
1224 | */ |
1225 | const_reverse_iterator |
1226 | crend() const noexcept |
1227 | { return const_reverse_iterator(this->_M_impl._M_start); } |
1228 | #endif |
1229 | |
1230 | // [23.2.1.2] capacity |
1231 | /** Returns the number of elements in the %deque. */ |
1232 | size_type |
1233 | size() const _GLIBCXX_NOEXCEPT |
1234 | { return this->_M_impl._M_finish - this->_M_impl._M_start; } |
1235 | |
1236 | /** Returns the size() of the largest possible %deque. */ |
1237 | size_type |
1238 | max_size() const _GLIBCXX_NOEXCEPT |
1239 | { return _S_max_size(a: _M_get_Tp_allocator()); } |
1240 | |
1241 | #if __cplusplus >= 201103L |
1242 | /** |
1243 | * @brief Resizes the %deque to the specified number of elements. |
1244 | * @param __new_size Number of elements the %deque should contain. |
1245 | * |
1246 | * This function will %resize the %deque to the specified |
1247 | * number of elements. If the number is smaller than the |
1248 | * %deque's current size the %deque is truncated, otherwise |
1249 | * default constructed elements are appended. |
1250 | */ |
1251 | void |
1252 | resize(size_type __new_size) |
1253 | { |
1254 | const size_type __len = size(); |
1255 | if (__new_size > __len) |
1256 | _M_default_append(n: __new_size - __len); |
1257 | else if (__new_size < __len) |
1258 | _M_erase_at_end(pos: this->_M_impl._M_start |
1259 | + difference_type(__new_size)); |
1260 | } |
1261 | |
1262 | /** |
1263 | * @brief Resizes the %deque to the specified number of elements. |
1264 | * @param __new_size Number of elements the %deque should contain. |
1265 | * @param __x Data with which new elements should be populated. |
1266 | * |
1267 | * This function will %resize the %deque to the specified |
1268 | * number of elements. If the number is smaller than the |
1269 | * %deque's current size the %deque is truncated, otherwise the |
1270 | * %deque is extended and new elements are populated with given |
1271 | * data. |
1272 | */ |
1273 | void |
1274 | resize(size_type __new_size, const value_type& __x) |
1275 | #else |
1276 | /** |
1277 | * @brief Resizes the %deque to the specified number of elements. |
1278 | * @param __new_size Number of elements the %deque should contain. |
1279 | * @param __x Data with which new elements should be populated. |
1280 | * |
1281 | * This function will %resize the %deque to the specified |
1282 | * number of elements. If the number is smaller than the |
1283 | * %deque's current size the %deque is truncated, otherwise the |
1284 | * %deque is extended and new elements are populated with given |
1285 | * data. |
1286 | */ |
1287 | void |
1288 | resize(size_type __new_size, value_type __x = value_type()) |
1289 | #endif |
1290 | { |
1291 | const size_type __len = size(); |
1292 | if (__new_size > __len) |
1293 | _M_fill_insert(pos: this->_M_impl._M_finish, n: __new_size - __len, __x); |
1294 | else if (__new_size < __len) |
1295 | _M_erase_at_end(pos: this->_M_impl._M_start |
1296 | + difference_type(__new_size)); |
1297 | } |
1298 | |
1299 | #if __cplusplus >= 201103L |
1300 | /** A non-binding request to reduce memory use. */ |
1301 | void |
1302 | shrink_to_fit() noexcept |
1303 | { _M_shrink_to_fit(); } |
1304 | #endif |
1305 | |
1306 | /** |
1307 | * Returns true if the %deque is empty. (Thus begin() would |
1308 | * equal end().) |
1309 | */ |
1310 | _GLIBCXX_NODISCARD bool |
1311 | empty() const _GLIBCXX_NOEXCEPT |
1312 | { return this->_M_impl._M_finish == this->_M_impl._M_start; } |
1313 | |
1314 | // element access |
1315 | /** |
1316 | * @brief Subscript access to the data contained in the %deque. |
1317 | * @param __n The index of the element for which data should be |
1318 | * accessed. |
1319 | * @return Read/write reference to data. |
1320 | * |
1321 | * This operator allows for easy, array-style, data access. |
1322 | * Note that data access with this operator is unchecked and |
1323 | * out_of_range lookups are not defined. (For checked lookups |
1324 | * see at().) |
1325 | */ |
1326 | reference |
1327 | operator[](size_type __n) _GLIBCXX_NOEXCEPT |
1328 | { |
1329 | __glibcxx_requires_subscript(__n); |
1330 | return this->_M_impl._M_start[difference_type(__n)]; |
1331 | } |
1332 | |
1333 | /** |
1334 | * @brief Subscript access to the data contained in the %deque. |
1335 | * @param __n The index of the element for which data should be |
1336 | * accessed. |
1337 | * @return Read-only (constant) reference to data. |
1338 | * |
1339 | * This operator allows for easy, array-style, data access. |
1340 | * Note that data access with this operator is unchecked and |
1341 | * out_of_range lookups are not defined. (For checked lookups |
1342 | * see at().) |
1343 | */ |
1344 | const_reference |
1345 | operator[](size_type __n) const _GLIBCXX_NOEXCEPT |
1346 | { |
1347 | __glibcxx_requires_subscript(__n); |
1348 | return this->_M_impl._M_start[difference_type(__n)]; |
1349 | } |
1350 | |
1351 | protected: |
1352 | /// Safety check used only from at(). |
1353 | void |
1354 | _M_range_check(size_type __n) const |
1355 | { |
1356 | if (__n >= this->size()) |
1357 | __throw_out_of_range_fmt(__N("deque::_M_range_check: __n " |
1358 | "(which is %zu)>= this->size() " |
1359 | "(which is %zu)" ), |
1360 | __n, this->size()); |
1361 | } |
1362 | |
1363 | public: |
1364 | /** |
1365 | * @brief Provides access to the data contained in the %deque. |
1366 | * @param __n The index of the element for which data should be |
1367 | * accessed. |
1368 | * @return Read/write reference to data. |
1369 | * @throw std::out_of_range If @a __n is an invalid index. |
1370 | * |
1371 | * This function provides for safer data access. The parameter |
1372 | * is first checked that it is in the range of the deque. The |
1373 | * function throws out_of_range if the check fails. |
1374 | */ |
1375 | reference |
1376 | at(size_type __n) |
1377 | { |
1378 | _M_range_check(__n); |
1379 | return (*this)[__n]; |
1380 | } |
1381 | |
1382 | /** |
1383 | * @brief Provides access to the data contained in the %deque. |
1384 | * @param __n The index of the element for which data should be |
1385 | * accessed. |
1386 | * @return Read-only (constant) reference to data. |
1387 | * @throw std::out_of_range If @a __n is an invalid index. |
1388 | * |
1389 | * This function provides for safer data access. The parameter is first |
1390 | * checked that it is in the range of the deque. The function throws |
1391 | * out_of_range if the check fails. |
1392 | */ |
1393 | const_reference |
1394 | at(size_type __n) const |
1395 | { |
1396 | _M_range_check(__n); |
1397 | return (*this)[__n]; |
1398 | } |
1399 | |
1400 | /** |
1401 | * Returns a read/write reference to the data at the first |
1402 | * element of the %deque. |
1403 | */ |
1404 | reference |
1405 | front() _GLIBCXX_NOEXCEPT |
1406 | { |
1407 | __glibcxx_requires_nonempty(); |
1408 | return *begin(); |
1409 | } |
1410 | |
1411 | /** |
1412 | * Returns a read-only (constant) reference to the data at the first |
1413 | * element of the %deque. |
1414 | */ |
1415 | const_reference |
1416 | front() const _GLIBCXX_NOEXCEPT |
1417 | { |
1418 | __glibcxx_requires_nonempty(); |
1419 | return *begin(); |
1420 | } |
1421 | |
1422 | /** |
1423 | * Returns a read/write reference to the data at the last element of the |
1424 | * %deque. |
1425 | */ |
1426 | reference |
1427 | back() _GLIBCXX_NOEXCEPT |
1428 | { |
1429 | __glibcxx_requires_nonempty(); |
1430 | iterator __tmp = end(); |
1431 | --__tmp; |
1432 | return *__tmp; |
1433 | } |
1434 | |
1435 | /** |
1436 | * Returns a read-only (constant) reference to the data at the last |
1437 | * element of the %deque. |
1438 | */ |
1439 | const_reference |
1440 | back() const _GLIBCXX_NOEXCEPT |
1441 | { |
1442 | __glibcxx_requires_nonempty(); |
1443 | const_iterator __tmp = end(); |
1444 | --__tmp; |
1445 | return *__tmp; |
1446 | } |
1447 | |
1448 | // [23.2.1.2] modifiers |
1449 | /** |
1450 | * @brief Add data to the front of the %deque. |
1451 | * @param __x Data to be added. |
1452 | * |
1453 | * This is a typical stack operation. The function creates an |
1454 | * element at the front of the %deque and assigns the given |
1455 | * data to it. Due to the nature of a %deque this operation |
1456 | * can be done in constant time. |
1457 | */ |
1458 | void |
1459 | push_front(const value_type& __x) |
1460 | { |
1461 | if (this->_M_impl._M_start._M_cur != this->_M_impl._M_start._M_first) |
1462 | { |
1463 | _Alloc_traits::construct(this->_M_impl, |
1464 | this->_M_impl._M_start._M_cur - 1, |
1465 | __x); |
1466 | --this->_M_impl._M_start._M_cur; |
1467 | } |
1468 | else |
1469 | _M_push_front_aux(__x); |
1470 | } |
1471 | |
1472 | #if __cplusplus >= 201103L |
1473 | void |
1474 | push_front(value_type&& __x) |
1475 | { emplace_front(std::move(__x)); } |
1476 | |
1477 | template<typename... _Args> |
1478 | #if __cplusplus > 201402L |
1479 | reference |
1480 | #else |
1481 | void |
1482 | #endif |
1483 | emplace_front(_Args&&... __args); |
1484 | #endif |
1485 | |
1486 | /** |
1487 | * @brief Add data to the end of the %deque. |
1488 | * @param __x Data to be added. |
1489 | * |
1490 | * This is a typical stack operation. The function creates an |
1491 | * element at the end of the %deque and assigns the given data |
1492 | * to it. Due to the nature of a %deque this operation can be |
1493 | * done in constant time. |
1494 | */ |
1495 | void |
1496 | push_back(const value_type& __x) |
1497 | { |
1498 | if (this->_M_impl._M_finish._M_cur |
1499 | != this->_M_impl._M_finish._M_last - 1) |
1500 | { |
1501 | _Alloc_traits::construct(this->_M_impl, |
1502 | this->_M_impl._M_finish._M_cur, __x); |
1503 | ++this->_M_impl._M_finish._M_cur; |
1504 | } |
1505 | else |
1506 | _M_push_back_aux(__x); |
1507 | } |
1508 | |
1509 | #if __cplusplus >= 201103L |
1510 | void |
1511 | push_back(value_type&& __x) |
1512 | { emplace_back(std::move(__x)); } |
1513 | |
1514 | template<typename... _Args> |
1515 | #if __cplusplus > 201402L |
1516 | reference |
1517 | #else |
1518 | void |
1519 | #endif |
1520 | emplace_back(_Args&&... __args); |
1521 | #endif |
1522 | |
1523 | /** |
1524 | * @brief Removes first element. |
1525 | * |
1526 | * This is a typical stack operation. It shrinks the %deque by one. |
1527 | * |
1528 | * Note that no data is returned, and if the first element's data is |
1529 | * needed, it should be retrieved before pop_front() is called. |
1530 | */ |
1531 | void |
1532 | pop_front() _GLIBCXX_NOEXCEPT |
1533 | { |
1534 | __glibcxx_requires_nonempty(); |
1535 | if (this->_M_impl._M_start._M_cur |
1536 | != this->_M_impl._M_start._M_last - 1) |
1537 | { |
1538 | _Alloc_traits::destroy(_M_get_Tp_allocator(), |
1539 | this->_M_impl._M_start._M_cur); |
1540 | ++this->_M_impl._M_start._M_cur; |
1541 | } |
1542 | else |
1543 | _M_pop_front_aux(); |
1544 | } |
1545 | |
1546 | /** |
1547 | * @brief Removes last element. |
1548 | * |
1549 | * This is a typical stack operation. It shrinks the %deque by one. |
1550 | * |
1551 | * Note that no data is returned, and if the last element's data is |
1552 | * needed, it should be retrieved before pop_back() is called. |
1553 | */ |
1554 | void |
1555 | pop_back() _GLIBCXX_NOEXCEPT |
1556 | { |
1557 | __glibcxx_requires_nonempty(); |
1558 | if (this->_M_impl._M_finish._M_cur |
1559 | != this->_M_impl._M_finish._M_first) |
1560 | { |
1561 | --this->_M_impl._M_finish._M_cur; |
1562 | _Alloc_traits::destroy(_M_get_Tp_allocator(), |
1563 | this->_M_impl._M_finish._M_cur); |
1564 | } |
1565 | else |
1566 | _M_pop_back_aux(); |
1567 | } |
1568 | |
1569 | #if __cplusplus >= 201103L |
1570 | /** |
1571 | * @brief Inserts an object in %deque before specified iterator. |
1572 | * @param __position A const_iterator into the %deque. |
1573 | * @param __args Arguments. |
1574 | * @return An iterator that points to the inserted data. |
1575 | * |
1576 | * This function will insert an object of type T constructed |
1577 | * with T(std::forward<Args>(args)...) before the specified location. |
1578 | */ |
1579 | template<typename... _Args> |
1580 | iterator |
1581 | emplace(const_iterator __position, _Args&&... __args); |
1582 | |
1583 | /** |
1584 | * @brief Inserts given value into %deque before specified iterator. |
1585 | * @param __position A const_iterator into the %deque. |
1586 | * @param __x Data to be inserted. |
1587 | * @return An iterator that points to the inserted data. |
1588 | * |
1589 | * This function will insert a copy of the given value before the |
1590 | * specified location. |
1591 | */ |
1592 | iterator |
1593 | insert(const_iterator __position, const value_type& __x); |
1594 | #else |
1595 | /** |
1596 | * @brief Inserts given value into %deque before specified iterator. |
1597 | * @param __position An iterator into the %deque. |
1598 | * @param __x Data to be inserted. |
1599 | * @return An iterator that points to the inserted data. |
1600 | * |
1601 | * This function will insert a copy of the given value before the |
1602 | * specified location. |
1603 | */ |
1604 | iterator |
1605 | insert(iterator __position, const value_type& __x); |
1606 | #endif |
1607 | |
1608 | #if __cplusplus >= 201103L |
1609 | /** |
1610 | * @brief Inserts given rvalue into %deque before specified iterator. |
1611 | * @param __position A const_iterator into the %deque. |
1612 | * @param __x Data to be inserted. |
1613 | * @return An iterator that points to the inserted data. |
1614 | * |
1615 | * This function will insert a copy of the given rvalue before the |
1616 | * specified location. |
1617 | */ |
1618 | iterator |
1619 | insert(const_iterator __position, value_type&& __x) |
1620 | { return emplace(__position, std::move(__x)); } |
1621 | |
1622 | /** |
1623 | * @brief Inserts an initializer list into the %deque. |
1624 | * @param __p An iterator into the %deque. |
1625 | * @param __l An initializer_list. |
1626 | * @return An iterator that points to the inserted data. |
1627 | * |
1628 | * This function will insert copies of the data in the |
1629 | * initializer_list @a __l into the %deque before the location |
1630 | * specified by @a __p. This is known as <em>list insert</em>. |
1631 | */ |
1632 | iterator |
1633 | insert(const_iterator __p, initializer_list<value_type> __l) |
1634 | { |
1635 | auto __offset = __p - cbegin(); |
1636 | _M_range_insert_aux(__p._M_const_cast(), __l.begin(), __l.end(), |
1637 | std::random_access_iterator_tag()); |
1638 | return begin() + __offset; |
1639 | } |
1640 | |
1641 | /** |
1642 | * @brief Inserts a number of copies of given data into the %deque. |
1643 | * @param __position A const_iterator into the %deque. |
1644 | * @param __n Number of elements to be inserted. |
1645 | * @param __x Data to be inserted. |
1646 | * @return An iterator that points to the inserted data. |
1647 | * |
1648 | * This function will insert a specified number of copies of the given |
1649 | * data before the location specified by @a __position. |
1650 | */ |
1651 | iterator |
1652 | insert(const_iterator __position, size_type __n, const value_type& __x) |
1653 | { |
1654 | difference_type __offset = __position - cbegin(); |
1655 | _M_fill_insert(pos: __position._M_const_cast(), __n, __x); |
1656 | return begin() + __offset; |
1657 | } |
1658 | #else |
1659 | /** |
1660 | * @brief Inserts a number of copies of given data into the %deque. |
1661 | * @param __position An iterator into the %deque. |
1662 | * @param __n Number of elements to be inserted. |
1663 | * @param __x Data to be inserted. |
1664 | * |
1665 | * This function will insert a specified number of copies of the given |
1666 | * data before the location specified by @a __position. |
1667 | */ |
1668 | void |
1669 | insert(iterator __position, size_type __n, const value_type& __x) |
1670 | { _M_fill_insert(__position, __n, __x); } |
1671 | #endif |
1672 | |
1673 | #if __cplusplus >= 201103L |
1674 | /** |
1675 | * @brief Inserts a range into the %deque. |
1676 | * @param __position A const_iterator into the %deque. |
1677 | * @param __first An input iterator. |
1678 | * @param __last An input iterator. |
1679 | * @return An iterator that points to the inserted data. |
1680 | * |
1681 | * This function will insert copies of the data in the range |
1682 | * [__first,__last) into the %deque before the location specified |
1683 | * by @a __position. This is known as <em>range insert</em>. |
1684 | */ |
1685 | template<typename _InputIterator, |
1686 | typename = std::_RequireInputIter<_InputIterator>> |
1687 | iterator |
1688 | insert(const_iterator __position, _InputIterator __first, |
1689 | _InputIterator __last) |
1690 | { |
1691 | difference_type __offset = __position - cbegin(); |
1692 | _M_range_insert_aux(__position._M_const_cast(), __first, __last, |
1693 | std::__iterator_category(__first)); |
1694 | return begin() + __offset; |
1695 | } |
1696 | #else |
1697 | /** |
1698 | * @brief Inserts a range into the %deque. |
1699 | * @param __position An iterator into the %deque. |
1700 | * @param __first An input iterator. |
1701 | * @param __last An input iterator. |
1702 | * |
1703 | * This function will insert copies of the data in the range |
1704 | * [__first,__last) into the %deque before the location specified |
1705 | * by @a __position. This is known as <em>range insert</em>. |
1706 | */ |
1707 | template<typename _InputIterator> |
1708 | void |
1709 | insert(iterator __position, _InputIterator __first, |
1710 | _InputIterator __last) |
1711 | { |
1712 | // Check whether it's an integral type. If so, it's not an iterator. |
1713 | typedef typename std::__is_integer<_InputIterator>::__type _Integral; |
1714 | _M_insert_dispatch(__position, __first, __last, _Integral()); |
1715 | } |
1716 | #endif |
1717 | |
1718 | /** |
1719 | * @brief Remove element at given position. |
1720 | * @param __position Iterator pointing to element to be erased. |
1721 | * @return An iterator pointing to the next element (or end()). |
1722 | * |
1723 | * This function will erase the element at the given position and thus |
1724 | * shorten the %deque by one. |
1725 | * |
1726 | * The user is cautioned that |
1727 | * this function only erases the element, and that if the element is |
1728 | * itself a pointer, the pointed-to memory is not touched in any way. |
1729 | * Managing the pointer is the user's responsibility. |
1730 | */ |
1731 | iterator |
1732 | #if __cplusplus >= 201103L |
1733 | erase(const_iterator __position) |
1734 | #else |
1735 | erase(iterator __position) |
1736 | #endif |
1737 | { return _M_erase(__position._M_const_cast()); } |
1738 | |
1739 | /** |
1740 | * @brief Remove a range of elements. |
1741 | * @param __first Iterator pointing to the first element to be erased. |
1742 | * @param __last Iterator pointing to one past the last element to be |
1743 | * erased. |
1744 | * @return An iterator pointing to the element pointed to by @a last |
1745 | * prior to erasing (or end()). |
1746 | * |
1747 | * This function will erase the elements in the range |
1748 | * [__first,__last) and shorten the %deque accordingly. |
1749 | * |
1750 | * The user is cautioned that |
1751 | * this function only erases the elements, and that if the elements |
1752 | * themselves are pointers, the pointed-to memory is not touched in any |
1753 | * way. Managing the pointer is the user's responsibility. |
1754 | */ |
1755 | iterator |
1756 | #if __cplusplus >= 201103L |
1757 | erase(const_iterator __first, const_iterator __last) |
1758 | #else |
1759 | erase(iterator __first, iterator __last) |
1760 | #endif |
1761 | { return _M_erase(__first._M_const_cast(), __last._M_const_cast()); } |
1762 | |
1763 | /** |
1764 | * @brief Swaps data with another %deque. |
1765 | * @param __x A %deque of the same element and allocator types. |
1766 | * |
1767 | * This exchanges the elements between two deques in constant time. |
1768 | * (Four pointers, so it should be quite fast.) |
1769 | * Note that the global std::swap() function is specialized such that |
1770 | * std::swap(d1,d2) will feed to this function. |
1771 | * |
1772 | * Whether the allocators are swapped depends on the allocator traits. |
1773 | */ |
1774 | void |
1775 | swap(deque& __x) _GLIBCXX_NOEXCEPT |
1776 | { |
1777 | #if __cplusplus >= 201103L |
1778 | __glibcxx_assert(_Alloc_traits::propagate_on_container_swap::value |
1779 | || _M_get_Tp_allocator() == __x._M_get_Tp_allocator()); |
1780 | #endif |
1781 | _M_impl._M_swap_data(__x._M_impl); |
1782 | _Alloc_traits::_S_on_swap(_M_get_Tp_allocator(), |
1783 | __x._M_get_Tp_allocator()); |
1784 | } |
1785 | |
1786 | /** |
1787 | * Erases all the elements. Note that this function only erases the |
1788 | * elements, and that if the elements themselves are pointers, the |
1789 | * pointed-to memory is not touched in any way. Managing the pointer is |
1790 | * the user's responsibility. |
1791 | */ |
1792 | void |
1793 | clear() _GLIBCXX_NOEXCEPT |
1794 | { _M_erase_at_end(pos: begin()); } |
1795 | |
1796 | protected: |
1797 | // Internal constructor functions follow. |
1798 | |
1799 | #if __cplusplus < 201103L |
1800 | // called by the range constructor to implement [23.1.1]/9 |
1801 | |
1802 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
1803 | // 438. Ambiguity in the "do the right thing" clause |
1804 | template<typename _Integer> |
1805 | void |
1806 | _M_initialize_dispatch(_Integer __n, _Integer __x, __true_type) |
1807 | { |
1808 | _M_initialize_map(_S_check_init_len(static_cast<size_type>(__n), |
1809 | _M_get_Tp_allocator())); |
1810 | _M_fill_initialize(__x); |
1811 | } |
1812 | |
1813 | // called by the range constructor to implement [23.1.1]/9 |
1814 | template<typename _InputIterator> |
1815 | void |
1816 | _M_initialize_dispatch(_InputIterator __first, _InputIterator __last, |
1817 | __false_type) |
1818 | { |
1819 | _M_range_initialize(__first, __last, |
1820 | std::__iterator_category(__first)); |
1821 | } |
1822 | #endif |
1823 | |
1824 | static size_t |
1825 | _S_check_init_len(size_t __n, const allocator_type& __a) |
1826 | { |
1827 | if (__n > _S_max_size(__a)) |
1828 | __throw_length_error( |
1829 | __N("cannot create std::deque larger than max_size()" )); |
1830 | return __n; |
1831 | } |
1832 | |
1833 | static size_type |
1834 | _S_max_size(const _Tp_alloc_type& __a) _GLIBCXX_NOEXCEPT |
1835 | { |
1836 | const size_t __diffmax = __gnu_cxx::__numeric_traits<ptrdiff_t>::__max; |
1837 | const size_t __allocmax = _Alloc_traits::max_size(__a); |
1838 | return (std::min)(a: __diffmax, b: __allocmax); |
1839 | } |
1840 | |
1841 | // called by the second initialize_dispatch above |
1842 | ///@{ |
1843 | /** |
1844 | * @brief Fills the deque with whatever is in [first,last). |
1845 | * @param __first An input iterator. |
1846 | * @param __last An input iterator. |
1847 | * @return Nothing. |
1848 | * |
1849 | * If the iterators are actually forward iterators (or better), then the |
1850 | * memory layout can be done all at once. Else we move forward using |
1851 | * push_back on each value from the iterator. |
1852 | */ |
1853 | template<typename _InputIterator> |
1854 | void |
1855 | _M_range_initialize(_InputIterator __first, _InputIterator __last, |
1856 | std::input_iterator_tag); |
1857 | |
1858 | // called by the second initialize_dispatch above |
1859 | template<typename _ForwardIterator> |
1860 | void |
1861 | _M_range_initialize(_ForwardIterator __first, _ForwardIterator __last, |
1862 | std::forward_iterator_tag); |
1863 | ///@} |
1864 | |
1865 | /** |
1866 | * @brief Fills the %deque with copies of value. |
1867 | * @param __value Initial value. |
1868 | * @return Nothing. |
1869 | * @pre _M_start and _M_finish have already been initialized, |
1870 | * but none of the %deque's elements have yet been constructed. |
1871 | * |
1872 | * This function is called only when the user provides an explicit size |
1873 | * (with or without an explicit exemplar value). |
1874 | */ |
1875 | void |
1876 | _M_fill_initialize(const value_type& __value); |
1877 | |
1878 | #if __cplusplus >= 201103L |
1879 | // called by deque(n). |
1880 | void |
1881 | _M_default_initialize(); |
1882 | #endif |
1883 | |
1884 | // Internal assign functions follow. The *_aux functions do the actual |
1885 | // assignment work for the range versions. |
1886 | |
1887 | #if __cplusplus < 201103L |
1888 | // called by the range assign to implement [23.1.1]/9 |
1889 | |
1890 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
1891 | // 438. Ambiguity in the "do the right thing" clause |
1892 | template<typename _Integer> |
1893 | void |
1894 | _M_assign_dispatch(_Integer __n, _Integer __val, __true_type) |
1895 | { _M_fill_assign(__n, __val); } |
1896 | |
1897 | // called by the range assign to implement [23.1.1]/9 |
1898 | template<typename _InputIterator> |
1899 | void |
1900 | _M_assign_dispatch(_InputIterator __first, _InputIterator __last, |
1901 | __false_type) |
1902 | { _M_assign_aux(__first, __last, std::__iterator_category(__first)); } |
1903 | #endif |
1904 | |
1905 | // called by the second assign_dispatch above |
1906 | template<typename _InputIterator> |
1907 | void |
1908 | _M_assign_aux(_InputIterator __first, _InputIterator __last, |
1909 | std::input_iterator_tag); |
1910 | |
1911 | // called by the second assign_dispatch above |
1912 | template<typename _ForwardIterator> |
1913 | void |
1914 | _M_assign_aux(_ForwardIterator __first, _ForwardIterator __last, |
1915 | std::forward_iterator_tag) |
1916 | { |
1917 | const size_type __len = std::distance(__first, __last); |
1918 | if (__len > size()) |
1919 | { |
1920 | _ForwardIterator __mid = __first; |
1921 | std::advance(__mid, size()); |
1922 | std::copy(__first, __mid, begin()); |
1923 | _M_range_insert_aux(end(), __mid, __last, |
1924 | std::__iterator_category(__first)); |
1925 | } |
1926 | else |
1927 | _M_erase_at_end(pos: std::copy(__first, __last, begin())); |
1928 | } |
1929 | |
1930 | // Called by assign(n,t), and the range assign when it turns out |
1931 | // to be the same thing. |
1932 | void |
1933 | _M_fill_assign(size_type __n, const value_type& __val) |
1934 | { |
1935 | if (__n > size()) |
1936 | { |
1937 | std::fill(begin(), end(), __val); |
1938 | _M_fill_insert(pos: end(), n: __n - size(), x: __val); |
1939 | } |
1940 | else |
1941 | { |
1942 | _M_erase_at_end(pos: begin() + difference_type(__n)); |
1943 | std::fill(begin(), end(), __val); |
1944 | } |
1945 | } |
1946 | |
1947 | ///@{ |
1948 | /// Helper functions for push_* and pop_*. |
1949 | #if __cplusplus < 201103L |
1950 | void _M_push_back_aux(const value_type&); |
1951 | |
1952 | void _M_push_front_aux(const value_type&); |
1953 | #else |
1954 | template<typename... _Args> |
1955 | void _M_push_back_aux(_Args&&... __args); |
1956 | |
1957 | template<typename... _Args> |
1958 | void _M_push_front_aux(_Args&&... __args); |
1959 | #endif |
1960 | |
1961 | void _M_pop_back_aux(); |
1962 | |
1963 | void _M_pop_front_aux(); |
1964 | ///@} |
1965 | |
1966 | // Internal insert functions follow. The *_aux functions do the actual |
1967 | // insertion work when all shortcuts fail. |
1968 | |
1969 | #if __cplusplus < 201103L |
1970 | // called by the range insert to implement [23.1.1]/9 |
1971 | |
1972 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
1973 | // 438. Ambiguity in the "do the right thing" clause |
1974 | template<typename _Integer> |
1975 | void |
1976 | _M_insert_dispatch(iterator __pos, |
1977 | _Integer __n, _Integer __x, __true_type) |
1978 | { _M_fill_insert(__pos, __n, __x); } |
1979 | |
1980 | // called by the range insert to implement [23.1.1]/9 |
1981 | template<typename _InputIterator> |
1982 | void |
1983 | _M_insert_dispatch(iterator __pos, |
1984 | _InputIterator __first, _InputIterator __last, |
1985 | __false_type) |
1986 | { |
1987 | _M_range_insert_aux(__pos, __first, __last, |
1988 | std::__iterator_category(__first)); |
1989 | } |
1990 | #endif |
1991 | |
1992 | // called by the second insert_dispatch above |
1993 | template<typename _InputIterator> |
1994 | void |
1995 | _M_range_insert_aux(iterator __pos, _InputIterator __first, |
1996 | _InputIterator __last, std::input_iterator_tag); |
1997 | |
1998 | // called by the second insert_dispatch above |
1999 | template<typename _ForwardIterator> |
2000 | void |
2001 | _M_range_insert_aux(iterator __pos, _ForwardIterator __first, |
2002 | _ForwardIterator __last, std::forward_iterator_tag); |
2003 | |
2004 | // Called by insert(p,n,x), and the range insert when it turns out to be |
2005 | // the same thing. Can use fill functions in optimal situations, |
2006 | // otherwise passes off to insert_aux(p,n,x). |
2007 | void |
2008 | _M_fill_insert(iterator __pos, size_type __n, const value_type& __x); |
2009 | |
2010 | // called by insert(p,x) |
2011 | #if __cplusplus < 201103L |
2012 | iterator |
2013 | _M_insert_aux(iterator __pos, const value_type& __x); |
2014 | #else |
2015 | template<typename... _Args> |
2016 | iterator |
2017 | _M_insert_aux(iterator __pos, _Args&&... __args); |
2018 | #endif |
2019 | |
2020 | // called by insert(p,n,x) via fill_insert |
2021 | void |
2022 | _M_insert_aux(iterator __pos, size_type __n, const value_type& __x); |
2023 | |
2024 | // called by range_insert_aux for forward iterators |
2025 | template<typename _ForwardIterator> |
2026 | void |
2027 | _M_insert_aux(iterator __pos, |
2028 | _ForwardIterator __first, _ForwardIterator __last, |
2029 | size_type __n); |
2030 | |
2031 | |
2032 | // Internal erase functions follow. |
2033 | |
2034 | void |
2035 | _M_destroy_data_aux(iterator __first, iterator __last); |
2036 | |
2037 | // Called by ~deque(). |
2038 | // NB: Doesn't deallocate the nodes. |
2039 | template<typename _Alloc1> |
2040 | void |
2041 | _M_destroy_data(iterator __first, iterator __last, const _Alloc1&) |
2042 | { _M_destroy_data_aux(__first, __last); } |
2043 | |
2044 | void |
2045 | _M_destroy_data(iterator __first, iterator __last, |
2046 | const std::allocator<_Tp>&) |
2047 | { |
2048 | if (!__has_trivial_destructor(value_type)) |
2049 | _M_destroy_data_aux(__first, __last); |
2050 | } |
2051 | |
2052 | // Called by erase(q1, q2). |
2053 | void |
2054 | _M_erase_at_begin(iterator __pos) |
2055 | { |
2056 | _M_destroy_data(begin(), __pos, _M_get_Tp_allocator()); |
2057 | _M_destroy_nodes(this->_M_impl._M_start._M_node, __pos._M_node); |
2058 | this->_M_impl._M_start = __pos; |
2059 | } |
2060 | |
2061 | // Called by erase(q1, q2), resize(), clear(), _M_assign_aux, |
2062 | // _M_fill_assign, operator=. |
2063 | void |
2064 | _M_erase_at_end(iterator __pos) |
2065 | { |
2066 | _M_destroy_data(__pos, end(), _M_get_Tp_allocator()); |
2067 | _M_destroy_nodes(__pos._M_node + 1, |
2068 | this->_M_impl._M_finish._M_node + 1); |
2069 | this->_M_impl._M_finish = __pos; |
2070 | } |
2071 | |
2072 | iterator |
2073 | _M_erase(iterator __pos); |
2074 | |
2075 | iterator |
2076 | _M_erase(iterator __first, iterator __last); |
2077 | |
2078 | #if __cplusplus >= 201103L |
2079 | // Called by resize(sz). |
2080 | void |
2081 | _M_default_append(size_type __n); |
2082 | |
2083 | bool |
2084 | _M_shrink_to_fit(); |
2085 | #endif |
2086 | |
2087 | ///@{ |
2088 | /// Memory-handling helpers for the previous internal insert functions. |
2089 | iterator |
2090 | _M_reserve_elements_at_front(size_type __n) |
2091 | { |
2092 | const size_type __vacancies = this->_M_impl._M_start._M_cur |
2093 | - this->_M_impl._M_start._M_first; |
2094 | if (__n > __vacancies) |
2095 | _M_new_elements_at_front(new_elements: __n - __vacancies); |
2096 | return this->_M_impl._M_start - difference_type(__n); |
2097 | } |
2098 | |
2099 | iterator |
2100 | _M_reserve_elements_at_back(size_type __n) |
2101 | { |
2102 | const size_type __vacancies = (this->_M_impl._M_finish._M_last |
2103 | - this->_M_impl._M_finish._M_cur) - 1; |
2104 | if (__n > __vacancies) |
2105 | _M_new_elements_at_back(new_elements: __n - __vacancies); |
2106 | return this->_M_impl._M_finish + difference_type(__n); |
2107 | } |
2108 | |
2109 | void |
2110 | _M_new_elements_at_front(size_type __new_elements); |
2111 | |
2112 | void |
2113 | _M_new_elements_at_back(size_type __new_elements); |
2114 | ///@} |
2115 | |
2116 | |
2117 | ///@{ |
2118 | /** |
2119 | * @brief Memory-handling helpers for the major %map. |
2120 | * |
2121 | * Makes sure the _M_map has space for new nodes. Does not |
2122 | * actually add the nodes. Can invalidate _M_map pointers. |
2123 | * (And consequently, %deque iterators.) |
2124 | */ |
2125 | void |
2126 | _M_reserve_map_at_back(size_type __nodes_to_add = 1) |
2127 | { |
2128 | if (__nodes_to_add + 1 > this->_M_impl._M_map_size |
2129 | - (this->_M_impl._M_finish._M_node - this->_M_impl._M_map)) |
2130 | _M_reallocate_map(__nodes_to_add, add_at_front: false); |
2131 | } |
2132 | |
2133 | void |
2134 | _M_reserve_map_at_front(size_type __nodes_to_add = 1) |
2135 | { |
2136 | if (__nodes_to_add > size_type(this->_M_impl._M_start._M_node |
2137 | - this->_M_impl._M_map)) |
2138 | _M_reallocate_map(__nodes_to_add, add_at_front: true); |
2139 | } |
2140 | |
2141 | void |
2142 | _M_reallocate_map(size_type __nodes_to_add, bool __add_at_front); |
2143 | ///@} |
2144 | |
2145 | #if __cplusplus >= 201103L |
2146 | // Constant-time, nothrow move assignment when source object's memory |
2147 | // can be moved because the allocators are equal. |
2148 | void |
2149 | _M_move_assign1(deque&& __x, /* always equal: */ true_type) noexcept |
2150 | { |
2151 | this->_M_impl._M_swap_data(__x._M_impl); |
2152 | __x.clear(); |
2153 | std::__alloc_on_move(_M_get_Tp_allocator(), __x._M_get_Tp_allocator()); |
2154 | } |
2155 | |
2156 | // When the allocators are not equal the operation could throw, because |
2157 | // we might need to allocate a new map for __x after moving from it |
2158 | // or we might need to allocate new elements for *this. |
2159 | void |
2160 | _M_move_assign1(deque&& __x, /* always equal: */ false_type) |
2161 | { |
2162 | if (_M_get_Tp_allocator() == __x._M_get_Tp_allocator()) |
2163 | return _M_move_assign1(std::move(__x), true_type()); |
2164 | |
2165 | constexpr bool __move_storage = |
2166 | _Alloc_traits::_S_propagate_on_move_assign(); |
2167 | _M_move_assign2(std::move(__x), __bool_constant<__move_storage>()); |
2168 | } |
2169 | |
2170 | // Destroy all elements and deallocate all memory, then replace |
2171 | // with elements created from __args. |
2172 | template<typename... _Args> |
2173 | void |
2174 | _M_replace_map(_Args&&... __args) |
2175 | { |
2176 | // Create new data first, so if allocation fails there are no effects. |
2177 | deque __newobj(std::forward<_Args>(__args)...); |
2178 | // Free existing storage using existing allocator. |
2179 | clear(); |
2180 | _M_deallocate_node(*begin()._M_node); // one node left after clear() |
2181 | _M_deallocate_map(this->_M_impl._M_map, this->_M_impl._M_map_size); |
2182 | this->_M_impl._M_map = nullptr; |
2183 | this->_M_impl._M_map_size = 0; |
2184 | // Take ownership of replacement memory. |
2185 | this->_M_impl._M_swap_data(__newobj._M_impl); |
2186 | } |
2187 | |
2188 | // Do move assignment when the allocator propagates. |
2189 | void |
2190 | _M_move_assign2(deque&& __x, /* propagate: */ true_type) |
2191 | { |
2192 | // Make a copy of the original allocator state. |
2193 | auto __alloc = __x._M_get_Tp_allocator(); |
2194 | // The allocator propagates so storage can be moved from __x, |
2195 | // leaving __x in a valid empty state with a moved-from allocator. |
2196 | _M_replace_map(std::move(__x)); |
2197 | // Move the corresponding allocator state too. |
2198 | _M_get_Tp_allocator() = std::move(__alloc); |
2199 | } |
2200 | |
2201 | // Do move assignment when it may not be possible to move source |
2202 | // object's memory, resulting in a linear-time operation. |
2203 | void |
2204 | _M_move_assign2(deque&& __x, /* propagate: */ false_type) |
2205 | { |
2206 | if (__x._M_get_Tp_allocator() == this->_M_get_Tp_allocator()) |
2207 | { |
2208 | // The allocators are equal so storage can be moved from __x, |
2209 | // leaving __x in a valid empty state with its current allocator. |
2210 | _M_replace_map(std::move(__x), __x.get_allocator()); |
2211 | } |
2212 | else |
2213 | { |
2214 | // The rvalue's allocator cannot be moved and is not equal, |
2215 | // so we need to individually move each element. |
2216 | _M_assign_aux(std::make_move_iterator(__x.begin()), |
2217 | std::make_move_iterator(__x.end()), |
2218 | std::random_access_iterator_tag()); |
2219 | __x.clear(); |
2220 | } |
2221 | } |
2222 | #endif |
2223 | }; |
2224 | |
2225 | #if __cpp_deduction_guides >= 201606 |
2226 | template<typename _InputIterator, typename _ValT |
2227 | = typename iterator_traits<_InputIterator>::value_type, |
2228 | typename _Allocator = allocator<_ValT>, |
2229 | typename = _RequireInputIter<_InputIterator>, |
2230 | typename = _RequireAllocator<_Allocator>> |
2231 | deque(_InputIterator, _InputIterator, _Allocator = _Allocator()) |
2232 | -> deque<_ValT, _Allocator>; |
2233 | #endif |
2234 | |
2235 | /** |
2236 | * @brief Deque equality comparison. |
2237 | * @param __x A %deque. |
2238 | * @param __y A %deque of the same type as @a __x. |
2239 | * @return True iff the size and elements of the deques are equal. |
2240 | * |
2241 | * This is an equivalence relation. It is linear in the size of the |
2242 | * deques. Deques are considered equivalent if their sizes are equal, |
2243 | * and if corresponding elements compare equal. |
2244 | */ |
2245 | template<typename _Tp, typename _Alloc> |
2246 | inline bool |
2247 | operator==(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y) |
2248 | { return __x.size() == __y.size() |
2249 | && std::equal(__x.begin(), __x.end(), __y.begin()); } |
2250 | |
2251 | #if __cpp_lib_three_way_comparison |
2252 | /** |
2253 | * @brief Deque ordering relation. |
2254 | * @param __x A `deque`. |
2255 | * @param __y A `deque` of the same type as `__x`. |
2256 | * @return A value indicating whether `__x` is less than, equal to, |
2257 | * greater than, or incomparable with `__y`. |
2258 | * |
2259 | * See `std::lexicographical_compare_three_way()` for how the determination |
2260 | * is made. This operator is used to synthesize relational operators like |
2261 | * `<` and `>=` etc. |
2262 | */ |
2263 | template<typename _Tp, typename _Alloc> |
2264 | inline __detail::__synth3way_t<_Tp> |
2265 | operator<=>(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y) |
2266 | { |
2267 | return std::lexicographical_compare_three_way(__x.begin(), __x.end(), |
2268 | __y.begin(), __y.end(), |
2269 | __detail::__synth3way); |
2270 | } |
2271 | #else |
2272 | /** |
2273 | * @brief Deque ordering relation. |
2274 | * @param __x A %deque. |
2275 | * @param __y A %deque of the same type as @a __x. |
2276 | * @return True iff @a x is lexicographically less than @a __y. |
2277 | * |
2278 | * This is a total ordering relation. It is linear in the size of the |
2279 | * deques. The elements must be comparable with @c <. |
2280 | * |
2281 | * See std::lexicographical_compare() for how the determination is made. |
2282 | */ |
2283 | template<typename _Tp, typename _Alloc> |
2284 | inline bool |
2285 | operator<(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y) |
2286 | { return std::lexicographical_compare(__x.begin(), __x.end(), |
2287 | __y.begin(), __y.end()); } |
2288 | |
2289 | /// Based on operator== |
2290 | template<typename _Tp, typename _Alloc> |
2291 | inline bool |
2292 | operator!=(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y) |
2293 | { return !(__x == __y); } |
2294 | |
2295 | /// Based on operator< |
2296 | template<typename _Tp, typename _Alloc> |
2297 | inline bool |
2298 | operator>(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y) |
2299 | { return __y < __x; } |
2300 | |
2301 | /// Based on operator< |
2302 | template<typename _Tp, typename _Alloc> |
2303 | inline bool |
2304 | operator<=(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y) |
2305 | { return !(__y < __x); } |
2306 | |
2307 | /// Based on operator< |
2308 | template<typename _Tp, typename _Alloc> |
2309 | inline bool |
2310 | operator>=(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y) |
2311 | { return !(__x < __y); } |
2312 | #endif // three-way comparison |
2313 | |
2314 | /// See std::deque::swap(). |
2315 | template<typename _Tp, typename _Alloc> |
2316 | inline void |
2317 | swap(deque<_Tp,_Alloc>& __x, deque<_Tp,_Alloc>& __y) |
2318 | _GLIBCXX_NOEXCEPT_IF(noexcept(__x.swap(__y))) |
2319 | { __x.swap(__y); } |
2320 | |
2321 | #undef _GLIBCXX_DEQUE_BUF_SIZE |
2322 | |
2323 | _GLIBCXX_END_NAMESPACE_CONTAINER |
2324 | |
2325 | #if __cplusplus >= 201103L |
2326 | // std::allocator is safe, but it is not the only allocator |
2327 | // for which this is valid. |
2328 | template<class _Tp> |
2329 | struct __is_bitwise_relocatable<_GLIBCXX_STD_C::deque<_Tp>> |
2330 | : true_type { }; |
2331 | #endif |
2332 | |
2333 | _GLIBCXX_END_NAMESPACE_VERSION |
2334 | } // namespace std |
2335 | |
2336 | #endif /* _STL_DEQUE_H */ |
2337 | |