libstdc++
stl_uninitialized.h
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1// Raw memory manipulators -*- 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
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11// This library is distributed in the hope that it will be useful,
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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) 1996,1997
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_uninitialized.h
52 * This is an internal header file, included by other library headers.
53 * Do not attempt to use it directly. @headername{memory}
54 */
55
56#ifndef _STL_UNINITIALIZED_H
57#define _STL_UNINITIALIZED_H 1
58
59#if __cplusplus >= 201103L
60#include <type_traits>
61#endif
62
63#include <bits/stl_algobase.h> // copy
64#include <ext/alloc_traits.h> // __alloc_traits
65
66#if __cplusplus >= 201703L
67#include <bits/stl_pair.h>
68#endif
69
70namespace std _GLIBCXX_VISIBILITY(default)
71{
72_GLIBCXX_BEGIN_NAMESPACE_VERSION
73
74 /** @addtogroup memory
75 * @{
76 */
77
78 /// @cond undocumented
79
80 template<bool _TrivialValueTypes>
81 struct __uninitialized_copy
82 {
83 template<typename _InputIterator, typename _ForwardIterator>
84 static _ForwardIterator
85 __uninit_copy(_InputIterator __first, _InputIterator __last,
86 _ForwardIterator __result)
87 {
88 _ForwardIterator __cur = __result;
89 __try
90 {
91 for (; __first != __last; ++__first, (void)++__cur)
92 std::_Construct(std::__addressof(*__cur), *__first);
93 return __cur;
94 }
95 __catch(...)
96 {
97 std::_Destroy(__result, __cur);
98 __throw_exception_again;
99 }
100 }
101 };
102
103 template<>
104 struct __uninitialized_copy<true>
105 {
106 template<typename _InputIterator, typename _ForwardIterator>
107 static _ForwardIterator
108 __uninit_copy(_InputIterator __first, _InputIterator __last,
109 _ForwardIterator __result)
110 { return std::copy(__first, __last, __result); }
111 };
112
113 /// @endcond
114
115 /**
116 * @brief Copies the range [first,last) into result.
117 * @param __first An input iterator.
118 * @param __last An input iterator.
119 * @param __result An output iterator.
120 * @return __result + (__first - __last)
121 *
122 * Like copy(), but does not require an initialized output range.
123 */
124 template<typename _InputIterator, typename _ForwardIterator>
125 inline _ForwardIterator
126 uninitialized_copy(_InputIterator __first, _InputIterator __last,
127 _ForwardIterator __result)
128 {
129 typedef typename iterator_traits<_InputIterator>::value_type
130 _ValueType1;
131 typedef typename iterator_traits<_ForwardIterator>::value_type
132 _ValueType2;
133#if __cplusplus < 201103L
134 const bool __assignable = true;
135#else
136 // Trivial types can have deleted copy constructor, but the std::copy
137 // optimization that uses memmove would happily "copy" them anyway.
138 static_assert(is_constructible<_ValueType2, decltype(*__first)>::value,
139 "result type must be constructible from value type of input range");
140
141 typedef typename iterator_traits<_InputIterator>::reference _RefType1;
142 typedef typename iterator_traits<_ForwardIterator>::reference _RefType2;
143 // Trivial types can have deleted assignment, so using std::copy
144 // would be ill-formed. Require assignability before using std::copy:
145 const bool __assignable = is_assignable<_RefType2, _RefType1>::value;
146#endif
147
148 return std::__uninitialized_copy<__is_trivial(_ValueType1)
149 && __is_trivial(_ValueType2)
150 && __assignable>::
151 __uninit_copy(__first, __last, __result);
152 }
153
154 /// @cond undocumented
155
156 template<bool _TrivialValueType>
157 struct __uninitialized_fill
158 {
159 template<typename _ForwardIterator, typename _Tp>
160 static void
161 __uninit_fill(_ForwardIterator __first, _ForwardIterator __last,
162 const _Tp& __x)
163 {
164 _ForwardIterator __cur = __first;
165 __try
166 {
167 for (; __cur != __last; ++__cur)
168 std::_Construct(std::__addressof(*__cur), __x);
169 }
170 __catch(...)
171 {
172 std::_Destroy(__first, __cur);
173 __throw_exception_again;
174 }
175 }
176 };
177
178 template<>
179 struct __uninitialized_fill<true>
180 {
181 template<typename _ForwardIterator, typename _Tp>
182 static void
183 __uninit_fill(_ForwardIterator __first, _ForwardIterator __last,
184 const _Tp& __x)
185 { std::fill(__first, __last, __x); }
186 };
187
188 /// @endcond
189
190 /**
191 * @brief Copies the value x into the range [first,last).
192 * @param __first An input iterator.
193 * @param __last An input iterator.
194 * @param __x The source value.
195 * @return Nothing.
196 *
197 * Like fill(), but does not require an initialized output range.
198 */
199 template<typename _ForwardIterator, typename _Tp>
200 inline void
201 uninitialized_fill(_ForwardIterator __first, _ForwardIterator __last,
202 const _Tp& __x)
203 {
204 typedef typename iterator_traits<_ForwardIterator>::value_type
205 _ValueType;
206#if __cplusplus < 201103L
207 const bool __assignable = true;
208#else
209 // Trivial types can have deleted copy constructor, but the std::fill
210 // optimization that uses memmove would happily "copy" them anyway.
211 static_assert(is_constructible<_ValueType, const _Tp&>::value,
212 "result type must be constructible from input type");
213
214 // Trivial types can have deleted assignment, so using std::fill
215 // would be ill-formed. Require assignability before using std::fill:
216 const bool __assignable = is_copy_assignable<_ValueType>::value;
217#endif
218
219 std::__uninitialized_fill<__is_trivial(_ValueType) && __assignable>::
220 __uninit_fill(__first, __last, __x);
221 }
222
223 /// @cond undocumented
224
225 template<bool _TrivialValueType>
226 struct __uninitialized_fill_n
227 {
228 template<typename _ForwardIterator, typename _Size, typename _Tp>
229 static _ForwardIterator
230 __uninit_fill_n(_ForwardIterator __first, _Size __n,
231 const _Tp& __x)
232 {
233 _ForwardIterator __cur = __first;
234 __try
235 {
236 for (; __n > 0; --__n, (void) ++__cur)
237 std::_Construct(std::__addressof(*__cur), __x);
238 return __cur;
239 }
240 __catch(...)
241 {
242 std::_Destroy(__first, __cur);
243 __throw_exception_again;
244 }
245 }
246 };
247
248 template<>
249 struct __uninitialized_fill_n<true>
250 {
251 template<typename _ForwardIterator, typename _Size, typename _Tp>
252 static _ForwardIterator
253 __uninit_fill_n(_ForwardIterator __first, _Size __n,
254 const _Tp& __x)
255 { return std::fill_n(__first, __n, __x); }
256 };
257
258 /// @endcond
259
260 // _GLIBCXX_RESOLVE_LIB_DEFECTS
261 // DR 1339. uninitialized_fill_n should return the end of its range
262 /**
263 * @brief Copies the value x into the range [first,first+n).
264 * @param __first An input iterator.
265 * @param __n The number of copies to make.
266 * @param __x The source value.
267 * @return Nothing.
268 *
269 * Like fill_n(), but does not require an initialized output range.
270 */
271 template<typename _ForwardIterator, typename _Size, typename _Tp>
272 inline _ForwardIterator
273 uninitialized_fill_n(_ForwardIterator __first, _Size __n, const _Tp& __x)
274 {
275 typedef typename iterator_traits<_ForwardIterator>::value_type
276 _ValueType;
277
278 // Trivial types do not need a constructor to begin their lifetime,
279 // so try to use std::fill_n to benefit from its memmove optimization.
280 // For arbitrary class types and floating point types we can't assume
281 // that __n > 0 and std::__size_to_integer(__n) > 0 are equivalent,
282 // so only use std::fill_n when _Size is already an integral type.
283#if __cplusplus < 201103L
284 const bool __can_fill = __is_integer<_Size>::__value;
285#else
286 // Trivial types can have deleted copy constructor, but the std::fill_n
287 // optimization that uses memmove would happily "copy" them anyway.
288 static_assert(is_constructible<_ValueType, const _Tp&>::value,
289 "result type must be constructible from input type");
290
291 // Trivial types can have deleted assignment, so using std::fill_n
292 // would be ill-formed. Require assignability before using std::fill_n:
293 constexpr bool __can_fill
294 = __and_<is_integral<_Size>, is_copy_assignable<_ValueType>>::value;
295#endif
296 return __uninitialized_fill_n<__is_trivial(_ValueType) && __can_fill>::
297 __uninit_fill_n(__first, __n, __x);
298 }
299
300 /// @cond undocumented
301
302 // Extensions: versions of uninitialized_copy, uninitialized_fill,
303 // and uninitialized_fill_n that take an allocator parameter.
304 // We dispatch back to the standard versions when we're given the
305 // default allocator. For nondefault allocators we do not use
306 // any of the POD optimizations.
307
308 template<typename _InputIterator, typename _ForwardIterator,
309 typename _Allocator>
310 _ForwardIterator
311 __uninitialized_copy_a(_InputIterator __first, _InputIterator __last,
312 _ForwardIterator __result, _Allocator& __alloc)
313 {
314 _ForwardIterator __cur = __result;
315 __try
316 {
317 typedef __gnu_cxx::__alloc_traits<_Allocator> __traits;
318 for (; __first != __last; ++__first, (void)++__cur)
319 __traits::construct(__alloc, std::__addressof(*__cur), *__first);
320 return __cur;
321 }
322 __catch(...)
323 {
324 std::_Destroy(__result, __cur, __alloc);
325 __throw_exception_again;
326 }
327 }
328
329 template<typename _InputIterator, typename _ForwardIterator, typename _Tp>
330 inline _ForwardIterator
331 __uninitialized_copy_a(_InputIterator __first, _InputIterator __last,
332 _ForwardIterator __result, allocator<_Tp>&)
333 { return std::uninitialized_copy(__first, __last, __result); }
334
335 template<typename _InputIterator, typename _ForwardIterator,
336 typename _Allocator>
337 inline _ForwardIterator
338 __uninitialized_move_a(_InputIterator __first, _InputIterator __last,
339 _ForwardIterator __result, _Allocator& __alloc)
340 {
341 return std::__uninitialized_copy_a(_GLIBCXX_MAKE_MOVE_ITERATOR(__first),
342 _GLIBCXX_MAKE_MOVE_ITERATOR(__last),
343 __result, __alloc);
344 }
345
346 template<typename _InputIterator, typename _ForwardIterator,
347 typename _Allocator>
348 inline _ForwardIterator
349 __uninitialized_move_if_noexcept_a(_InputIterator __first,
350 _InputIterator __last,
351 _ForwardIterator __result,
352 _Allocator& __alloc)
353 {
354 return std::__uninitialized_copy_a
355 (_GLIBCXX_MAKE_MOVE_IF_NOEXCEPT_ITERATOR(__first),
356 _GLIBCXX_MAKE_MOVE_IF_NOEXCEPT_ITERATOR(__last), __result, __alloc);
357 }
358
359 template<typename _ForwardIterator, typename _Tp, typename _Allocator>
360 void
361 __uninitialized_fill_a(_ForwardIterator __first, _ForwardIterator __last,
362 const _Tp& __x, _Allocator& __alloc)
363 {
364 _ForwardIterator __cur = __first;
365 __try
366 {
367 typedef __gnu_cxx::__alloc_traits<_Allocator> __traits;
368 for (; __cur != __last; ++__cur)
369 __traits::construct(__alloc, std::__addressof(*__cur), __x);
370 }
371 __catch(...)
372 {
373 std::_Destroy(__first, __cur, __alloc);
374 __throw_exception_again;
375 }
376 }
377
378 template<typename _ForwardIterator, typename _Tp, typename _Tp2>
379 inline void
380 __uninitialized_fill_a(_ForwardIterator __first, _ForwardIterator __last,
381 const _Tp& __x, allocator<_Tp2>&)
382 { std::uninitialized_fill(__first, __last, __x); }
383
384 template<typename _ForwardIterator, typename _Size, typename _Tp,
385 typename _Allocator>
386 _ForwardIterator
387 __uninitialized_fill_n_a(_ForwardIterator __first, _Size __n,
388 const _Tp& __x, _Allocator& __alloc)
389 {
390 _ForwardIterator __cur = __first;
391 __try
392 {
393 typedef __gnu_cxx::__alloc_traits<_Allocator> __traits;
394 for (; __n > 0; --__n, (void) ++__cur)
395 __traits::construct(__alloc, std::__addressof(*__cur), __x);
396 return __cur;
397 }
398 __catch(...)
399 {
400 std::_Destroy(__first, __cur, __alloc);
401 __throw_exception_again;
402 }
403 }
404
405 template<typename _ForwardIterator, typename _Size, typename _Tp,
406 typename _Tp2>
407 inline _ForwardIterator
408 __uninitialized_fill_n_a(_ForwardIterator __first, _Size __n,
409 const _Tp& __x, allocator<_Tp2>&)
410 { return std::uninitialized_fill_n(__first, __n, __x); }
411
412
413 // Extensions: __uninitialized_copy_move, __uninitialized_move_copy,
414 // __uninitialized_fill_move, __uninitialized_move_fill.
415 // All of these algorithms take a user-supplied allocator, which is used
416 // for construction and destruction.
417
418 // __uninitialized_copy_move
419 // Copies [first1, last1) into [result, result + (last1 - first1)), and
420 // move [first2, last2) into
421 // [result, result + (last1 - first1) + (last2 - first2)).
422 template<typename _InputIterator1, typename _InputIterator2,
423 typename _ForwardIterator, typename _Allocator>
424 inline _ForwardIterator
425 __uninitialized_copy_move(_InputIterator1 __first1,
426 _InputIterator1 __last1,
427 _InputIterator2 __first2,
428 _InputIterator2 __last2,
429 _ForwardIterator __result,
430 _Allocator& __alloc)
431 {
432 _ForwardIterator __mid = std::__uninitialized_copy_a(__first1, __last1,
433 __result,
434 __alloc);
435 __try
436 {
437 return std::__uninitialized_move_a(__first2, __last2, __mid, __alloc);
438 }
439 __catch(...)
440 {
441 std::_Destroy(__result, __mid, __alloc);
442 __throw_exception_again;
443 }
444 }
445
446 // __uninitialized_move_copy
447 // Moves [first1, last1) into [result, result + (last1 - first1)), and
448 // copies [first2, last2) into
449 // [result, result + (last1 - first1) + (last2 - first2)).
450 template<typename _InputIterator1, typename _InputIterator2,
451 typename _ForwardIterator, typename _Allocator>
452 inline _ForwardIterator
453 __uninitialized_move_copy(_InputIterator1 __first1,
454 _InputIterator1 __last1,
455 _InputIterator2 __first2,
456 _InputIterator2 __last2,
457 _ForwardIterator __result,
458 _Allocator& __alloc)
459 {
460 _ForwardIterator __mid = std::__uninitialized_move_a(__first1, __last1,
461 __result,
462 __alloc);
463 __try
464 {
465 return std::__uninitialized_copy_a(__first2, __last2, __mid, __alloc);
466 }
467 __catch(...)
468 {
469 std::_Destroy(__result, __mid, __alloc);
470 __throw_exception_again;
471 }
472 }
473
474 // __uninitialized_fill_move
475 // Fills [result, mid) with x, and moves [first, last) into
476 // [mid, mid + (last - first)).
477 template<typename _ForwardIterator, typename _Tp, typename _InputIterator,
478 typename _Allocator>
479 inline _ForwardIterator
480 __uninitialized_fill_move(_ForwardIterator __result, _ForwardIterator __mid,
481 const _Tp& __x, _InputIterator __first,
482 _InputIterator __last, _Allocator& __alloc)
483 {
484 std::__uninitialized_fill_a(__result, __mid, __x, __alloc);
485 __try
486 {
487 return std::__uninitialized_move_a(__first, __last, __mid, __alloc);
488 }
489 __catch(...)
490 {
491 std::_Destroy(__result, __mid, __alloc);
492 __throw_exception_again;
493 }
494 }
495
496 // __uninitialized_move_fill
497 // Moves [first1, last1) into [first2, first2 + (last1 - first1)), and
498 // fills [first2 + (last1 - first1), last2) with x.
499 template<typename _InputIterator, typename _ForwardIterator, typename _Tp,
500 typename _Allocator>
501 inline void
502 __uninitialized_move_fill(_InputIterator __first1, _InputIterator __last1,
503 _ForwardIterator __first2,
504 _ForwardIterator __last2, const _Tp& __x,
505 _Allocator& __alloc)
506 {
507 _ForwardIterator __mid2 = std::__uninitialized_move_a(__first1, __last1,
508 __first2,
509 __alloc);
510 __try
511 {
512 std::__uninitialized_fill_a(__mid2, __last2, __x, __alloc);
513 }
514 __catch(...)
515 {
516 std::_Destroy(__first2, __mid2, __alloc);
517 __throw_exception_again;
518 }
519 }
520
521 /// @endcond
522
523#if __cplusplus >= 201103L
524 /// @cond undocumented
525
526 // Extensions: __uninitialized_default, __uninitialized_default_n,
527 // __uninitialized_default_a, __uninitialized_default_n_a.
528
529 template<bool _TrivialValueType>
530 struct __uninitialized_default_1
531 {
532 template<typename _ForwardIterator>
533 static void
534 __uninit_default(_ForwardIterator __first, _ForwardIterator __last)
535 {
536 _ForwardIterator __cur = __first;
537 __try
538 {
539 for (; __cur != __last; ++__cur)
540 std::_Construct(std::__addressof(*__cur));
541 }
542 __catch(...)
543 {
544 std::_Destroy(__first, __cur);
545 __throw_exception_again;
546 }
547 }
548 };
549
550 template<>
551 struct __uninitialized_default_1<true>
552 {
553 template<typename _ForwardIterator>
554 static void
555 __uninit_default(_ForwardIterator __first, _ForwardIterator __last)
556 {
557 if (__first == __last)
558 return;
559
560 typename iterator_traits<_ForwardIterator>::value_type* __val
561 = std::__addressof(*__first);
562 std::_Construct(__val);
563 if (++__first != __last)
564 std::fill(__first, __last, *__val);
565 }
566 };
567
568 template<bool _TrivialValueType>
569 struct __uninitialized_default_n_1
570 {
571 template<typename _ForwardIterator, typename _Size>
572 static _ForwardIterator
573 __uninit_default_n(_ForwardIterator __first, _Size __n)
574 {
575 _ForwardIterator __cur = __first;
576 __try
577 {
578 for (; __n > 0; --__n, (void) ++__cur)
579 std::_Construct(std::__addressof(*__cur));
580 return __cur;
581 }
582 __catch(...)
583 {
584 std::_Destroy(__first, __cur);
585 __throw_exception_again;
586 }
587 }
588 };
589
590 template<>
591 struct __uninitialized_default_n_1<true>
592 {
593 template<typename _ForwardIterator, typename _Size>
594 static _ForwardIterator
595 __uninit_default_n(_ForwardIterator __first, _Size __n)
596 {
597 if (__n > 0)
598 {
599 typename iterator_traits<_ForwardIterator>::value_type* __val
600 = std::__addressof(*__first);
601 std::_Construct(__val);
602 ++__first;
603 __first = std::fill_n(__first, __n - 1, *__val);
604 }
605 return __first;
606 }
607 };
608
609 // __uninitialized_default
610 // Fills [first, last) with value-initialized value_types.
611 template<typename _ForwardIterator>
612 inline void
613 __uninitialized_default(_ForwardIterator __first,
614 _ForwardIterator __last)
615 {
616 typedef typename iterator_traits<_ForwardIterator>::value_type
617 _ValueType;
618 // trivial types can have deleted assignment
619 const bool __assignable = is_copy_assignable<_ValueType>::value;
620
621 std::__uninitialized_default_1<__is_trivial(_ValueType)
622 && __assignable>::
623 __uninit_default(__first, __last);
624 }
625
626 // __uninitialized_default_n
627 // Fills [first, first + n) with value-initialized value_types.
628 template<typename _ForwardIterator, typename _Size>
629 inline _ForwardIterator
630 __uninitialized_default_n(_ForwardIterator __first, _Size __n)
631 {
632 typedef typename iterator_traits<_ForwardIterator>::value_type
633 _ValueType;
634 // See uninitialized_fill_n for the conditions for using std::fill_n.
635 constexpr bool __can_fill
636 = __and_<is_integral<_Size>, is_copy_assignable<_ValueType>>::value;
637
638 return __uninitialized_default_n_1<__is_trivial(_ValueType)
639 && __can_fill>::
640 __uninit_default_n(__first, __n);
641 }
642
643
644 // __uninitialized_default_a
645 // Fills [first, last) with value_types constructed by the allocator
646 // alloc, with no arguments passed to the construct call.
647 template<typename _ForwardIterator, typename _Allocator>
648 void
649 __uninitialized_default_a(_ForwardIterator __first,
650 _ForwardIterator __last,
651 _Allocator& __alloc)
652 {
653 _ForwardIterator __cur = __first;
654 __try
655 {
656 typedef __gnu_cxx::__alloc_traits<_Allocator> __traits;
657 for (; __cur != __last; ++__cur)
658 __traits::construct(__alloc, std::__addressof(*__cur));
659 }
660 __catch(...)
661 {
662 std::_Destroy(__first, __cur, __alloc);
663 __throw_exception_again;
664 }
665 }
666
667 template<typename _ForwardIterator, typename _Tp>
668 inline void
669 __uninitialized_default_a(_ForwardIterator __first,
670 _ForwardIterator __last,
671 allocator<_Tp>&)
672 { std::__uninitialized_default(__first, __last); }
673
674
675 // __uninitialized_default_n_a
676 // Fills [first, first + n) with value_types constructed by the allocator
677 // alloc, with no arguments passed to the construct call.
678 template<typename _ForwardIterator, typename _Size, typename _Allocator>
679 _ForwardIterator
680 __uninitialized_default_n_a(_ForwardIterator __first, _Size __n,
681 _Allocator& __alloc)
682 {
683 _ForwardIterator __cur = __first;
684 __try
685 {
686 typedef __gnu_cxx::__alloc_traits<_Allocator> __traits;
687 for (; __n > 0; --__n, (void) ++__cur)
688 __traits::construct(__alloc, std::__addressof(*__cur));
689 return __cur;
690 }
691 __catch(...)
692 {
693 std::_Destroy(__first, __cur, __alloc);
694 __throw_exception_again;
695 }
696 }
697
698 // __uninitialized_default_n_a specialization for std::allocator,
699 // which ignores the allocator and value-initializes the elements.
700 template<typename _ForwardIterator, typename _Size, typename _Tp>
701 inline _ForwardIterator
702 __uninitialized_default_n_a(_ForwardIterator __first, _Size __n,
703 allocator<_Tp>&)
704 { return std::__uninitialized_default_n(__first, __n); }
705
706 template<bool _TrivialValueType>
707 struct __uninitialized_default_novalue_1
708 {
709 template<typename _ForwardIterator>
710 static void
711 __uninit_default_novalue(_ForwardIterator __first,
712 _ForwardIterator __last)
713 {
714 _ForwardIterator __cur = __first;
715 __try
716 {
717 for (; __cur != __last; ++__cur)
718 std::_Construct_novalue(std::__addressof(*__cur));
719 }
720 __catch(...)
721 {
722 std::_Destroy(__first, __cur);
723 __throw_exception_again;
724 }
725 }
726 };
727
728 template<>
729 struct __uninitialized_default_novalue_1<true>
730 {
731 template<typename _ForwardIterator>
732 static void
733 __uninit_default_novalue(_ForwardIterator __first,
734 _ForwardIterator __last)
735 {
736 }
737 };
738
739 template<bool _TrivialValueType>
740 struct __uninitialized_default_novalue_n_1
741 {
742 template<typename _ForwardIterator, typename _Size>
743 static _ForwardIterator
744 __uninit_default_novalue_n(_ForwardIterator __first, _Size __n)
745 {
746 _ForwardIterator __cur = __first;
747 __try
748 {
749 for (; __n > 0; --__n, (void) ++__cur)
750 std::_Construct_novalue(std::__addressof(*__cur));
751 return __cur;
752 }
753 __catch(...)
754 {
755 std::_Destroy(__first, __cur);
756 __throw_exception_again;
757 }
758 }
759 };
760
761 template<>
762 struct __uninitialized_default_novalue_n_1<true>
763 {
764 template<typename _ForwardIterator, typename _Size>
765 static _ForwardIterator
766 __uninit_default_novalue_n(_ForwardIterator __first, _Size __n)
767 { return std::next(__first, __n); }
768 };
769
770 // __uninitialized_default_novalue
771 // Fills [first, last) with default-initialized value_types.
772 template<typename _ForwardIterator>
773 inline void
774 __uninitialized_default_novalue(_ForwardIterator __first,
775 _ForwardIterator __last)
776 {
777 typedef typename iterator_traits<_ForwardIterator>::value_type
778 _ValueType;
779
780 std::__uninitialized_default_novalue_1<
781 is_trivially_default_constructible<_ValueType>::value>::
782 __uninit_default_novalue(__first, __last);
783 }
784
785 // __uninitialized_default_novalue_n
786 // Fills [first, first + n) with default-initialized value_types.
787 template<typename _ForwardIterator, typename _Size>
788 inline _ForwardIterator
789 __uninitialized_default_novalue_n(_ForwardIterator __first, _Size __n)
790 {
791 typedef typename iterator_traits<_ForwardIterator>::value_type
792 _ValueType;
793
794 return __uninitialized_default_novalue_n_1<
795 is_trivially_default_constructible<_ValueType>::value>::
796 __uninit_default_novalue_n(__first, __n);
797 }
798
799 template<typename _InputIterator, typename _Size,
800 typename _ForwardIterator>
801 _ForwardIterator
802 __uninitialized_copy_n(_InputIterator __first, _Size __n,
803 _ForwardIterator __result, input_iterator_tag)
804 {
805 _ForwardIterator __cur = __result;
806 __try
807 {
808 for (; __n > 0; --__n, (void) ++__first, ++__cur)
809 std::_Construct(std::__addressof(*__cur), *__first);
810 return __cur;
811 }
812 __catch(...)
813 {
814 std::_Destroy(__result, __cur);
815 __throw_exception_again;
816 }
817 }
818
819 template<typename _RandomAccessIterator, typename _Size,
820 typename _ForwardIterator>
821 inline _ForwardIterator
822 __uninitialized_copy_n(_RandomAccessIterator __first, _Size __n,
823 _ForwardIterator __result,
824 random_access_iterator_tag)
825 { return std::uninitialized_copy(__first, __first + __n, __result); }
826
827 template<typename _InputIterator, typename _Size,
828 typename _ForwardIterator>
829 pair<_InputIterator, _ForwardIterator>
830 __uninitialized_copy_n_pair(_InputIterator __first, _Size __n,
831 _ForwardIterator __result, input_iterator_tag)
832 {
833 _ForwardIterator __cur = __result;
834 __try
835 {
836 for (; __n > 0; --__n, (void) ++__first, ++__cur)
837 std::_Construct(std::__addressof(*__cur), *__first);
838 return {__first, __cur};
839 }
840 __catch(...)
841 {
842 std::_Destroy(__result, __cur);
843 __throw_exception_again;
844 }
845 }
846
847 template<typename _RandomAccessIterator, typename _Size,
848 typename _ForwardIterator>
849 inline pair<_RandomAccessIterator, _ForwardIterator>
850 __uninitialized_copy_n_pair(_RandomAccessIterator __first, _Size __n,
851 _ForwardIterator __result,
852 random_access_iterator_tag)
853 {
854 auto __second_res = uninitialized_copy(__first, __first + __n, __result);
855 auto __first_res = std::next(__first, __n);
856 return {__first_res, __second_res};
857 }
858
859 /// @endcond
860
861 /**
862 * @brief Copies the range [first,first+n) into result.
863 * @param __first An input iterator.
864 * @param __n The number of elements to copy.
865 * @param __result An output iterator.
866 * @return __result + __n
867 *
868 * Like copy_n(), but does not require an initialized output range.
869 */
870 template<typename _InputIterator, typename _Size, typename _ForwardIterator>
871 inline _ForwardIterator
872 uninitialized_copy_n(_InputIterator __first, _Size __n,
873 _ForwardIterator __result)
874 { return std::__uninitialized_copy_n(__first, __n, __result,
875 std::__iterator_category(__first)); }
876
877 /// @cond undocumented
878 template<typename _InputIterator, typename _Size, typename _ForwardIterator>
879 inline pair<_InputIterator, _ForwardIterator>
880 __uninitialized_copy_n_pair(_InputIterator __first, _Size __n,
881 _ForwardIterator __result)
882 {
883 return
884 std::__uninitialized_copy_n_pair(__first, __n, __result,
885 std::__iterator_category(__first));
886 }
887 /// @endcond
888#endif
889
890#if __cplusplus >= 201703L
891# define __cpp_lib_raw_memory_algorithms 201606L
892
893 /**
894 * @brief Default-initializes objects in the range [first,last).
895 * @param __first A forward iterator.
896 * @param __last A forward iterator.
897 */
898 template <typename _ForwardIterator>
899 inline void
900 uninitialized_default_construct(_ForwardIterator __first,
901 _ForwardIterator __last)
902 {
903 __uninitialized_default_novalue(__first, __last);
904 }
905
906 /**
907 * @brief Default-initializes objects in the range [first,first+count).
908 * @param __first A forward iterator.
909 * @param __count The number of objects to construct.
910 * @return __first + __count
911 */
912 template <typename _ForwardIterator, typename _Size>
913 inline _ForwardIterator
914 uninitialized_default_construct_n(_ForwardIterator __first, _Size __count)
915 {
916 return __uninitialized_default_novalue_n(__first, __count);
917 }
918
919 /**
920 * @brief Value-initializes objects in the range [first,last).
921 * @param __first A forward iterator.
922 * @param __last A forward iterator.
923 */
924 template <typename _ForwardIterator>
925 inline void
926 uninitialized_value_construct(_ForwardIterator __first,
927 _ForwardIterator __last)
928 {
929 return __uninitialized_default(__first, __last);
930 }
931
932 /**
933 * @brief Value-initializes objects in the range [first,first+count).
934 * @param __first A forward iterator.
935 * @param __count The number of objects to construct.
936 * @return __result + __count
937 */
938 template <typename _ForwardIterator, typename _Size>
939 inline _ForwardIterator
940 uninitialized_value_construct_n(_ForwardIterator __first, _Size __count)
941 {
942 return __uninitialized_default_n(__first, __count);
943 }
944
945 /**
946 * @brief Move-construct from the range [first,last) into result.
947 * @param __first An input iterator.
948 * @param __last An input iterator.
949 * @param __result An output iterator.
950 * @return __result + (__first - __last)
951 */
952 template <typename _InputIterator, typename _ForwardIterator>
953 inline _ForwardIterator
954 uninitialized_move(_InputIterator __first, _InputIterator __last,
955 _ForwardIterator __result)
956 {
957 return std::uninitialized_copy
958 (_GLIBCXX_MAKE_MOVE_ITERATOR(__first),
959 _GLIBCXX_MAKE_MOVE_ITERATOR(__last), __result);
960 }
961
962 /**
963 * @brief Move-construct from the range [first,first+count) into result.
964 * @param __first An input iterator.
965 * @param __count The number of objects to initialize.
966 * @param __result An output iterator.
967 * @return __result + __count
968 */
969 template <typename _InputIterator, typename _Size, typename _ForwardIterator>
970 inline pair<_InputIterator, _ForwardIterator>
971 uninitialized_move_n(_InputIterator __first, _Size __count,
972 _ForwardIterator __result)
973 {
974 auto __res = std::__uninitialized_copy_n_pair
975 (_GLIBCXX_MAKE_MOVE_ITERATOR(__first),
976 __count, __result);
977 return {__res.first.base(), __res.second};
978 }
979#endif // C++17
980
981#if __cplusplus >= 201103L
982 /// @cond undocumented
983
984 template<typename _Tp, typename _Up, typename _Allocator>
985 inline void
986 __relocate_object_a(_Tp* __restrict __dest, _Up* __restrict __orig,
987 _Allocator& __alloc)
988 noexcept(noexcept(std::allocator_traits<_Allocator>::construct(__alloc,
989 __dest, std::move(*__orig)))
990 && noexcept(std::allocator_traits<_Allocator>::destroy(
991 __alloc, std::__addressof(*__orig))))
992 {
993 typedef std::allocator_traits<_Allocator> __traits;
994 __traits::construct(__alloc, __dest, std::move(*__orig));
995 __traits::destroy(__alloc, std::__addressof(*__orig));
996 }
997
998 // This class may be specialized for specific types.
999 // Also known as is_trivially_relocatable.
1000 template<typename _Tp, typename = void>
1001 struct __is_bitwise_relocatable
1002 : is_trivial<_Tp> { };
1003
1004 template <typename _Tp, typename _Up>
1005 inline __enable_if_t<std::__is_bitwise_relocatable<_Tp>::value, _Tp*>
1006 __relocate_a_1(_Tp* __first, _Tp* __last,
1007 _Tp* __result, allocator<_Up>&) noexcept
1008 {
1009 ptrdiff_t __count = __last - __first;
1010 if (__count > 0)
1011 __builtin_memmove(__result, __first, __count * sizeof(_Tp));
1012 return __result + __count;
1013 }
1014
1015 template <typename _InputIterator, typename _ForwardIterator,
1016 typename _Allocator>
1017 inline _ForwardIterator
1018 __relocate_a_1(_InputIterator __first, _InputIterator __last,
1019 _ForwardIterator __result, _Allocator& __alloc)
1020 noexcept(noexcept(std::__relocate_object_a(std::addressof(*__result),
1021 std::addressof(*__first),
1022 __alloc)))
1023 {
1024 typedef typename iterator_traits<_InputIterator>::value_type
1025 _ValueType;
1026 typedef typename iterator_traits<_ForwardIterator>::value_type
1027 _ValueType2;
1028 static_assert(std::is_same<_ValueType, _ValueType2>::value,
1029 "relocation is only possible for values of the same type");
1030 _ForwardIterator __cur = __result;
1031 for (; __first != __last; ++__first, (void)++__cur)
1032 std::__relocate_object_a(std::__addressof(*__cur),
1033 std::__addressof(*__first), __alloc);
1034 return __cur;
1035 }
1036
1037 template <typename _InputIterator, typename _ForwardIterator,
1038 typename _Allocator>
1039 inline _ForwardIterator
1040 __relocate_a(_InputIterator __first, _InputIterator __last,
1041 _ForwardIterator __result, _Allocator& __alloc)
1042 noexcept(noexcept(__relocate_a_1(std::__niter_base(__first),
1043 std::__niter_base(__last),
1044 std::__niter_base(__result), __alloc)))
1045 {
1046 return __relocate_a_1(std::__niter_base(__first),
1047 std::__niter_base(__last),
1048 std::__niter_base(__result), __alloc);
1049 }
1050
1051 /// @endcond
1052#endif
1053
1054 /// @} group memory
1055
1056_GLIBCXX_END_NAMESPACE_VERSION
1057} // namespace
1058
1059#endif /* _STL_UNINITIALIZED_H */
std::uninitialized_copy_n
_ForwardIterator uninitialized_copy_n(_InputIterator __first, _Size __n, _ForwardIterator __result)
Copies the range [first,first+n) into result.
Definition: stl_uninitialized.h:872
std::uninitialized_fill
void uninitialized_fill(_ForwardIterator __first, _ForwardIterator __last, const _Tp &__x)
Copies the value x into the range [first,last).
Definition: stl_uninitialized.h:201
std::uninitialized_value_construct_n
_ForwardIterator uninitialized_value_construct_n(_ForwardIterator __first, _Size __count)
Value-initializes objects in the range [first,first+count).
Definition: stl_uninitialized.h:940
std::uninitialized_move
_ForwardIterator uninitialized_move(_InputIterator __first, _InputIterator __last, _ForwardIterator __result)
Move-construct from the range [first,last) into result.
Definition: stl_uninitialized.h:954
std::uninitialized_fill_n
_ForwardIterator uninitialized_fill_n(_ForwardIterator __first, _Size __n, const _Tp &__x)
Copies the value x into the range [first,first+n).
Definition: stl_uninitialized.h:273
std::uninitialized_default_construct_n
_ForwardIterator uninitialized_default_construct_n(_ForwardIterator __first, _Size __count)
Default-initializes objects in the range [first,first+count).
Definition: stl_uninitialized.h:914
std::uninitialized_default_construct
void uninitialized_default_construct(_ForwardIterator __first, _ForwardIterator __last)
Default-initializes objects in the range [first,last).
Definition: stl_uninitialized.h:900
std::uninitialized_copy
_ForwardIterator uninitialized_copy(_InputIterator __first, _InputIterator __last, _ForwardIterator __result)
Copies the range [first,last) into result.
Definition: stl_uninitialized.h:126
std::uninitialized_value_construct
void uninitialized_value_construct(_ForwardIterator __first, _ForwardIterator __last)
Value-initializes objects in the range [first,last).
Definition: stl_uninitialized.h:926
std::uninitialized_move_n
pair< _InputIterator, _ForwardIterator > uninitialized_move_n(_InputIterator __first, _Size __count, _ForwardIterator __result)
Move-construct from the range [first,first+count) into result.
Definition: stl_uninitialized.h:971
std::addressof
constexpr _Tp * addressof(_Tp &__r) noexcept
Returns the actual address of the object or function referenced by r, even in the presence of an over...
Definition: move.h:145
std::move
constexpr std::remove_reference< _Tp >::type && move(_Tp &&__t) noexcept
Convert a value to an rvalue.
Definition: move.h:104
std::__addressof
constexpr _Tp * __addressof(_Tp &__r) noexcept
Same as C++11 std::addressof.
Definition: move.h:49
std::__iterator_category
constexpr iterator_traits< _Iter >::iterator_category __iterator_category(const _Iter &)
Definition: stl_iterator_base_types.h:238
std
ISO C++ entities toplevel namespace is std.
std::_Construct
constexpr void _Construct(_Tp *__p, _Args &&... __args)
Definition: stl_construct.h:109
std::_Destroy
void _Destroy(_ForwardIterator __first, _ForwardIterator __last, _Allocator &__alloc)
Definition: bits/alloc_traits.h:831
std::is_same
is_same
Definition: type_traits:1410
std::is_constructible
is_constructible
Definition: type_traits:954
std::is_assignable
is_assignable
Definition: type_traits:1088
std::is_copy_assignable
is_copy_assignable
Definition: type_traits:1109
std::allocator_traits
Uniform interface to all allocator types.
Definition: bits/alloc_traits.h:91
std::allocator_traits::construct
static constexpr auto construct(_Alloc &__a, _Tp *__p, _Args &&... __args) noexcept(noexcept(_S_construct(__a, __p, std::forward< _Args >(__args)...))) -> decltype(_S_construct(__a, __p, std::forward< _Args >(__args)...))
Construct an object of type _Tp
Definition: bits/alloc_traits.h:360
std::iterator_traits
Traits class for iterators.
Definition: stl_iterator_base_types.h:178
__gnu_cxx::__alloc_traits
Uniform interface to C++98 and C++11 allocators.
Definition: ext/alloc_traits.h:52