1// -*- C++ -*-
2#ifndef _LIBCPP_SPLIT_BUFFER
3#define _LIBCPP_SPLIT_BUFFER
4
5#include <__config>
6#include <type_traits>
7#include <algorithm>
8
9#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
10#pragma GCC system_header
11#endif
12
13_LIBCPP_PUSH_MACROS
14#include <__undef_macros>
15
16
17_LIBCPP_BEGIN_NAMESPACE_STD
18
19template <bool>
20class __split_buffer_common
21{
22protected:
23 void __throw_length_error() const;
24 void __throw_out_of_range() const;
25};
26
27template <class _Tp, class _Allocator = allocator<_Tp> >
28struct __split_buffer
29 : private __split_buffer_common<true>
30{
31private:
32 __split_buffer(const __split_buffer&);
33 __split_buffer& operator=(const __split_buffer&);
34public:
35 typedef _Tp value_type;
36 typedef _Allocator allocator_type;
37 typedef typename remove_reference<allocator_type>::type __alloc_rr;
38 typedef allocator_traits<__alloc_rr> __alloc_traits;
39 typedef value_type& reference;
40 typedef const value_type& const_reference;
41 typedef typename __alloc_traits::size_type size_type;
42 typedef typename __alloc_traits::difference_type difference_type;
43 typedef typename __alloc_traits::pointer pointer;
44 typedef typename __alloc_traits::const_pointer const_pointer;
45 typedef pointer iterator;
46 typedef const_pointer const_iterator;
47
48 pointer __first_;
49 pointer __begin_;
50 pointer __end_;
51 __compressed_pair<pointer, allocator_type> __end_cap_;
52
53 typedef typename add_lvalue_reference<allocator_type>::type __alloc_ref;
54 typedef typename add_lvalue_reference<allocator_type>::type __alloc_const_ref;
55
56 _LIBCPP_INLINE_VISIBILITY __alloc_rr& __alloc() _NOEXCEPT {return __end_cap_.second();}
57 _LIBCPP_INLINE_VISIBILITY const __alloc_rr& __alloc() const _NOEXCEPT {return __end_cap_.second();}
58 _LIBCPP_INLINE_VISIBILITY pointer& __end_cap() _NOEXCEPT {return __end_cap_.first();}
59 _LIBCPP_INLINE_VISIBILITY const pointer& __end_cap() const _NOEXCEPT {return __end_cap_.first();}
60
61 _LIBCPP_INLINE_VISIBILITY
62 __split_buffer()
63 _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value);
64 _LIBCPP_INLINE_VISIBILITY
65 explicit __split_buffer(__alloc_rr& __a);
66 _LIBCPP_INLINE_VISIBILITY
67 explicit __split_buffer(const __alloc_rr& __a);
68 __split_buffer(size_type __cap, size_type __start, __alloc_rr& __a);
69 ~__split_buffer();
70
71#ifndef _LIBCPP_CXX03_LANG
72 __split_buffer(__split_buffer&& __c)
73 _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value);
74 __split_buffer(__split_buffer&& __c, const __alloc_rr& __a);
75 __split_buffer& operator=(__split_buffer&& __c)
76 _NOEXCEPT_((__alloc_traits::propagate_on_container_move_assignment::value &&
77 is_nothrow_move_assignable<allocator_type>::value) ||
78 !__alloc_traits::propagate_on_container_move_assignment::value);
79#endif // _LIBCPP_CXX03_LANG
80
81 _LIBCPP_INLINE_VISIBILITY iterator begin() _NOEXCEPT {return __begin_;}
82 _LIBCPP_INLINE_VISIBILITY const_iterator begin() const _NOEXCEPT {return __begin_;}
83 _LIBCPP_INLINE_VISIBILITY iterator end() _NOEXCEPT {return __end_;}
84 _LIBCPP_INLINE_VISIBILITY const_iterator end() const _NOEXCEPT {return __end_;}
85
86 _LIBCPP_INLINE_VISIBILITY
87 void clear() _NOEXCEPT
88 {__destruct_at_end(__begin_);}
89 _LIBCPP_INLINE_VISIBILITY size_type size() const {return static_cast<size_type>(__end_ - __begin_);}
90 _LIBCPP_INLINE_VISIBILITY bool empty() const {return __end_ == __begin_;}
91 _LIBCPP_INLINE_VISIBILITY size_type capacity() const {return static_cast<size_type>(__end_cap() - __first_);}
92 _LIBCPP_INLINE_VISIBILITY size_type __front_spare() const {return static_cast<size_type>(__begin_ - __first_);}
93 _LIBCPP_INLINE_VISIBILITY size_type __back_spare() const {return static_cast<size_type>(__end_cap() - __end_);}
94
95 _LIBCPP_INLINE_VISIBILITY reference front() {return *__begin_;}
96 _LIBCPP_INLINE_VISIBILITY const_reference front() const {return *__begin_;}
97 _LIBCPP_INLINE_VISIBILITY reference back() {return *(__end_ - 1);}
98 _LIBCPP_INLINE_VISIBILITY const_reference back() const {return *(__end_ - 1);}
99
100 void reserve(size_type __n);
101 void shrink_to_fit() _NOEXCEPT;
102 void push_front(const_reference __x);
103 _LIBCPP_INLINE_VISIBILITY void push_back(const_reference __x);
104#ifndef _LIBCPP_CXX03_LANG
105 void push_front(value_type&& __x);
106 void push_back(value_type&& __x);
107 template <class... _Args>
108 void emplace_back(_Args&&... __args);
109#endif // !defined(_LIBCPP_CXX03_LANG)
110
111 _LIBCPP_INLINE_VISIBILITY void pop_front() {__destruct_at_begin(__begin_+1);}
112 _LIBCPP_INLINE_VISIBILITY void pop_back() {__destruct_at_end(__end_-1);}
113
114 void __construct_at_end(size_type __n);
115 void __construct_at_end(size_type __n, const_reference __x);
116 template <class _InputIter>
117 typename enable_if
118 <
119 __is_cpp17_input_iterator<_InputIter>::value &&
120 !__is_cpp17_forward_iterator<_InputIter>::value,
121 void
122 >::type
123 __construct_at_end(_InputIter __first, _InputIter __last);
124 template <class _ForwardIterator>
125 typename enable_if
126 <
127 __is_cpp17_forward_iterator<_ForwardIterator>::value,
128 void
129 >::type
130 __construct_at_end(_ForwardIterator __first, _ForwardIterator __last);
131
132 _LIBCPP_INLINE_VISIBILITY void __destruct_at_begin(pointer __new_begin)
133 {__destruct_at_begin(__new_begin, is_trivially_destructible<value_type>());}
134 _LIBCPP_INLINE_VISIBILITY
135 void __destruct_at_begin(pointer __new_begin, false_type);
136 _LIBCPP_INLINE_VISIBILITY
137 void __destruct_at_begin(pointer __new_begin, true_type);
138
139 _LIBCPP_INLINE_VISIBILITY
140 void __destruct_at_end(pointer __new_last) _NOEXCEPT
141 {__destruct_at_end(__new_last, false_type());}
142 _LIBCPP_INLINE_VISIBILITY
143 void __destruct_at_end(pointer __new_last, false_type) _NOEXCEPT;
144 _LIBCPP_INLINE_VISIBILITY
145 void __destruct_at_end(pointer __new_last, true_type) _NOEXCEPT;
146
147 void swap(__split_buffer& __x)
148 _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value||
149 __is_nothrow_swappable<__alloc_rr>::value);
150
151 bool __invariants() const;
152
153private:
154 _LIBCPP_INLINE_VISIBILITY
155 void __move_assign_alloc(__split_buffer& __c, true_type)
156 _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
157 {
158 __alloc() = _VSTD::move(__c.__alloc());
159 }
160
161 _LIBCPP_INLINE_VISIBILITY
162 void __move_assign_alloc(__split_buffer&, false_type) _NOEXCEPT
163 {}
164
165 struct _ConstructTransaction {
166 explicit _ConstructTransaction(pointer* __p, size_type __n) _NOEXCEPT
167 : __pos_(*__p), __end_(*__p + __n), __dest_(__p) {
168 }
169 ~_ConstructTransaction() {
170 *__dest_ = __pos_;
171 }
172 pointer __pos_;
173 const pointer __end_;
174 private:
175 pointer *__dest_;
176 };
177};
178
179template <class _Tp, class _Allocator>
180bool
181__split_buffer<_Tp, _Allocator>::__invariants() const
182{
183 if (__first_ == nullptr)
184 {
185 if (__begin_ != nullptr)
186 return false;
187 if (__end_ != nullptr)
188 return false;
189 if (__end_cap() != nullptr)
190 return false;
191 }
192 else
193 {
194 if (__begin_ < __first_)
195 return false;
196 if (__end_ < __begin_)
197 return false;
198 if (__end_cap() < __end_)
199 return false;
200 }
201 return true;
202}
203
204// Default constructs __n objects starting at __end_
205// throws if construction throws
206// Precondition: __n > 0
207// Precondition: size() + __n <= capacity()
208// Postcondition: size() == size() + __n
209template <class _Tp, class _Allocator>
210void
211__split_buffer<_Tp, _Allocator>::__construct_at_end(size_type __n)
212{
213 _ConstructTransaction __tx(&this->__end_, __n);
214 for (; __tx.__pos_ != __tx.__end_; ++__tx.__pos_) {
215 __alloc_traits::construct(this->__alloc(), _VSTD::__to_address(__tx.__pos_));
216 }
217}
218
219// Copy constructs __n objects starting at __end_ from __x
220// throws if construction throws
221// Precondition: __n > 0
222// Precondition: size() + __n <= capacity()
223// Postcondition: size() == old size() + __n
224// Postcondition: [i] == __x for all i in [size() - __n, __n)
225template <class _Tp, class _Allocator>
226void
227__split_buffer<_Tp, _Allocator>::__construct_at_end(size_type __n, const_reference __x)
228{
229 _ConstructTransaction __tx(&this->__end_, __n);
230 for (; __tx.__pos_ != __tx.__end_; ++__tx.__pos_) {
231 __alloc_traits::construct(this->__alloc(),
232 _VSTD::__to_address(__tx.__pos_), __x);
233 }
234}
235
236template <class _Tp, class _Allocator>
237template <class _InputIter>
238typename enable_if
239<
240 __is_cpp17_input_iterator<_InputIter>::value &&
241 !__is_cpp17_forward_iterator<_InputIter>::value,
242 void
243>::type
244__split_buffer<_Tp, _Allocator>::__construct_at_end(_InputIter __first, _InputIter __last)
245{
246 __alloc_rr& __a = this->__alloc();
247 for (; __first != __last; ++__first)
248 {
249 if (__end_ == __end_cap())
250 {
251 size_type __old_cap = __end_cap() - __first_;
252 size_type __new_cap = _VSTD::max<size_type>(2 * __old_cap, 8);
253 __split_buffer __buf(__new_cap, 0, __a);
254 for (pointer __p = __begin_; __p != __end_; ++__p, ++__buf.__end_)
255 __alloc_traits::construct(__buf.__alloc(),
256 _VSTD::__to_address(__buf.__end_), _VSTD::move(*__p));
257 swap(__buf);
258 }
259 __alloc_traits::construct(__a, _VSTD::__to_address(this->__end_), *__first);
260 ++this->__end_;
261 }
262}
263
264template <class _Tp, class _Allocator>
265template <class _ForwardIterator>
266typename enable_if
267<
268 __is_cpp17_forward_iterator<_ForwardIterator>::value,
269 void
270>::type
271__split_buffer<_Tp, _Allocator>::__construct_at_end(_ForwardIterator __first, _ForwardIterator __last)
272{
273 _ConstructTransaction __tx(&this->__end_, std::distance(__first, __last));
274 for (; __tx.__pos_ != __tx.__end_; ++__tx.__pos_, ++__first) {
275 __alloc_traits::construct(this->__alloc(),
276 _VSTD::__to_address(__tx.__pos_), *__first);
277 }
278}
279
280template <class _Tp, class _Allocator>
281inline
282void
283__split_buffer<_Tp, _Allocator>::__destruct_at_begin(pointer __new_begin, false_type)
284{
285 while (__begin_ != __new_begin)
286 __alloc_traits::destroy(__alloc(), __to_address(__begin_++));
287}
288
289template <class _Tp, class _Allocator>
290inline
291void
292__split_buffer<_Tp, _Allocator>::__destruct_at_begin(pointer __new_begin, true_type)
293{
294 __begin_ = __new_begin;
295}
296
297template <class _Tp, class _Allocator>
298inline _LIBCPP_INLINE_VISIBILITY
299void
300__split_buffer<_Tp, _Allocator>::__destruct_at_end(pointer __new_last, false_type) _NOEXCEPT
301{
302 while (__new_last != __end_)
303 __alloc_traits::destroy(__alloc(), __to_address(--__end_));
304}
305
306template <class _Tp, class _Allocator>
307inline _LIBCPP_INLINE_VISIBILITY
308void
309__split_buffer<_Tp, _Allocator>::__destruct_at_end(pointer __new_last, true_type) _NOEXCEPT
310{
311 __end_ = __new_last;
312}
313
314template <class _Tp, class _Allocator>
315__split_buffer<_Tp, _Allocator>::__split_buffer(size_type __cap, size_type __start, __alloc_rr& __a)
316 : __end_cap_(nullptr, __a)
317{
318 __first_ = __cap != 0 ? __alloc_traits::allocate(__alloc(), __cap) : nullptr;
319 __begin_ = __end_ = __first_ + __start;
320 __end_cap() = __first_ + __cap;
321}
322
323template <class _Tp, class _Allocator>
324inline
325__split_buffer<_Tp, _Allocator>::__split_buffer()
326 _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
327 : __first_(nullptr), __begin_(nullptr), __end_(nullptr), __end_cap_(nullptr, __default_init_tag())
328{
329}
330
331template <class _Tp, class _Allocator>
332inline
333__split_buffer<_Tp, _Allocator>::__split_buffer(__alloc_rr& __a)
334 : __first_(nullptr), __begin_(nullptr), __end_(nullptr), __end_cap_(nullptr, __a)
335{
336}
337
338template <class _Tp, class _Allocator>
339inline
340__split_buffer<_Tp, _Allocator>::__split_buffer(const __alloc_rr& __a)
341 : __first_(nullptr), __begin_(nullptr), __end_(nullptr), __end_cap_(nullptr, __a)
342{
343}
344
345template <class _Tp, class _Allocator>
346__split_buffer<_Tp, _Allocator>::~__split_buffer()
347{
348 clear();
349 if (__first_)
350 __alloc_traits::deallocate(__alloc(), __first_, capacity());
351}
352
353#ifndef _LIBCPP_CXX03_LANG
354
355template <class _Tp, class _Allocator>
356__split_buffer<_Tp, _Allocator>::__split_buffer(__split_buffer&& __c)
357 _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value)
358 : __first_(_VSTD::move(__c.__first_)),
359 __begin_(_VSTD::move(__c.__begin_)),
360 __end_(_VSTD::move(__c.__end_)),
361 __end_cap_(_VSTD::move(__c.__end_cap_))
362{
363 __c.__first_ = nullptr;
364 __c.__begin_ = nullptr;
365 __c.__end_ = nullptr;
366 __c.__end_cap() = nullptr;
367}
368
369template <class _Tp, class _Allocator>
370__split_buffer<_Tp, _Allocator>::__split_buffer(__split_buffer&& __c, const __alloc_rr& __a)
371 : __end_cap_(nullptr, __a)
372{
373 if (__a == __c.__alloc())
374 {
375 __first_ = __c.__first_;
376 __begin_ = __c.__begin_;
377 __end_ = __c.__end_;
378 __end_cap() = __c.__end_cap();
379 __c.__first_ = nullptr;
380 __c.__begin_ = nullptr;
381 __c.__end_ = nullptr;
382 __c.__end_cap() = nullptr;
383 }
384 else
385 {
386 size_type __cap = __c.size();
387 __first_ = __alloc_traits::allocate(__alloc(), __cap);
388 __begin_ = __end_ = __first_;
389 __end_cap() = __first_ + __cap;
390 typedef move_iterator<iterator> _Ip;
391 __construct_at_end(_Ip(__c.begin()), _Ip(__c.end()));
392 }
393}
394
395template <class _Tp, class _Allocator>
396__split_buffer<_Tp, _Allocator>&
397__split_buffer<_Tp, _Allocator>::operator=(__split_buffer&& __c)
398 _NOEXCEPT_((__alloc_traits::propagate_on_container_move_assignment::value &&
399 is_nothrow_move_assignable<allocator_type>::value) ||
400 !__alloc_traits::propagate_on_container_move_assignment::value)
401{
402 clear();
403 shrink_to_fit();
404 __first_ = __c.__first_;
405 __begin_ = __c.__begin_;
406 __end_ = __c.__end_;
407 __end_cap() = __c.__end_cap();
408 __move_assign_alloc(__c,
409 integral_constant<bool,
410 __alloc_traits::propagate_on_container_move_assignment::value>());
411 __c.__first_ = __c.__begin_ = __c.__end_ = __c.__end_cap() = nullptr;
412 return *this;
413}
414
415#endif // _LIBCPP_CXX03_LANG
416
417template <class _Tp, class _Allocator>
418void
419__split_buffer<_Tp, _Allocator>::swap(__split_buffer& __x)
420 _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value||
421 __is_nothrow_swappable<__alloc_rr>::value)
422{
423 _VSTD::swap(__first_, __x.__first_);
424 _VSTD::swap(__begin_, __x.__begin_);
425 _VSTD::swap(__end_, __x.__end_);
426 _VSTD::swap(__end_cap(), __x.__end_cap());
427 __swap_allocator(__alloc(), __x.__alloc());
428}
429
430template <class _Tp, class _Allocator>
431void
432__split_buffer<_Tp, _Allocator>::reserve(size_type __n)
433{
434 if (__n < capacity())
435 {
436 __split_buffer<value_type, __alloc_rr&> __t(__n, 0, __alloc());
437 __t.__construct_at_end(move_iterator<pointer>(__begin_),
438 move_iterator<pointer>(__end_));
439 _VSTD::swap(__first_, __t.__first_);
440 _VSTD::swap(__begin_, __t.__begin_);
441 _VSTD::swap(__end_, __t.__end_);
442 _VSTD::swap(__end_cap(), __t.__end_cap());
443 }
444}
445
446template <class _Tp, class _Allocator>
447void
448__split_buffer<_Tp, _Allocator>::shrink_to_fit() _NOEXCEPT
449{
450 if (capacity() > size())
451 {
452#ifndef _LIBCPP_NO_EXCEPTIONS
453 try
454 {
455#endif // _LIBCPP_NO_EXCEPTIONS
456 __split_buffer<value_type, __alloc_rr&> __t(size(), 0, __alloc());
457 __t.__construct_at_end(move_iterator<pointer>(__begin_),
458 move_iterator<pointer>(__end_));
459 __t.__end_ = __t.__begin_ + (__end_ - __begin_);
460 _VSTD::swap(__first_, __t.__first_);
461 _VSTD::swap(__begin_, __t.__begin_);
462 _VSTD::swap(__end_, __t.__end_);
463 _VSTD::swap(__end_cap(), __t.__end_cap());
464#ifndef _LIBCPP_NO_EXCEPTIONS
465 }
466 catch (...)
467 {
468 }
469#endif // _LIBCPP_NO_EXCEPTIONS
470 }
471}
472
473template <class _Tp, class _Allocator>
474void
475__split_buffer<_Tp, _Allocator>::push_front(const_reference __x)
476{
477 if (__begin_ == __first_)
478 {
479 if (__end_ < __end_cap())
480 {
481 difference_type __d = __end_cap() - __end_;
482 __d = (__d + 1) / 2;
483 __begin_ = _VSTD::move_backward(__begin_, __end_, __end_ + __d);
484 __end_ += __d;
485 }
486 else
487 {
488 size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1);
489 __split_buffer<value_type, __alloc_rr&> __t(__c, (__c + 3) / 4, __alloc());
490 __t.__construct_at_end(move_iterator<pointer>(__begin_),
491 move_iterator<pointer>(__end_));
492 _VSTD::swap(__first_, __t.__first_);
493 _VSTD::swap(__begin_, __t.__begin_);
494 _VSTD::swap(__end_, __t.__end_);
495 _VSTD::swap(__end_cap(), __t.__end_cap());
496 }
497 }
498 __alloc_traits::construct(__alloc(), _VSTD::__to_address(__begin_-1), __x);
499 --__begin_;
500}
501
502#ifndef _LIBCPP_CXX03_LANG
503
504template <class _Tp, class _Allocator>
505void
506__split_buffer<_Tp, _Allocator>::push_front(value_type&& __x)
507{
508 if (__begin_ == __first_)
509 {
510 if (__end_ < __end_cap())
511 {
512 difference_type __d = __end_cap() - __end_;
513 __d = (__d + 1) / 2;
514 __begin_ = _VSTD::move_backward(__begin_, __end_, __end_ + __d);
515 __end_ += __d;
516 }
517 else
518 {
519 size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1);
520 __split_buffer<value_type, __alloc_rr&> __t(__c, (__c + 3) / 4, __alloc());
521 __t.__construct_at_end(move_iterator<pointer>(__begin_),
522 move_iterator<pointer>(__end_));
523 _VSTD::swap(__first_, __t.__first_);
524 _VSTD::swap(__begin_, __t.__begin_);
525 _VSTD::swap(__end_, __t.__end_);
526 _VSTD::swap(__end_cap(), __t.__end_cap());
527 }
528 }
529 __alloc_traits::construct(__alloc(), _VSTD::__to_address(__begin_-1),
530 _VSTD::move(__x));
531 --__begin_;
532}
533
534#endif // _LIBCPP_CXX03_LANG
535
536template <class _Tp, class _Allocator>
537inline _LIBCPP_INLINE_VISIBILITY
538void
539__split_buffer<_Tp, _Allocator>::push_back(const_reference __x)
540{
541 if (__end_ == __end_cap())
542 {
543 if (__begin_ > __first_)
544 {
545 difference_type __d = __begin_ - __first_;
546 __d = (__d + 1) / 2;
547 __end_ = _VSTD::move(__begin_, __end_, __begin_ - __d);
548 __begin_ -= __d;
549 }
550 else
551 {
552 size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1);
553 __split_buffer<value_type, __alloc_rr&> __t(__c, __c / 4, __alloc());
554 __t.__construct_at_end(move_iterator<pointer>(__begin_),
555 move_iterator<pointer>(__end_));
556 _VSTD::swap(__first_, __t.__first_);
557 _VSTD::swap(__begin_, __t.__begin_);
558 _VSTD::swap(__end_, __t.__end_);
559 _VSTD::swap(__end_cap(), __t.__end_cap());
560 }
561 }
562 __alloc_traits::construct(__alloc(), _VSTD::__to_address(__end_), __x);
563 ++__end_;
564}
565
566#ifndef _LIBCPP_CXX03_LANG
567
568template <class _Tp, class _Allocator>
569void
570__split_buffer<_Tp, _Allocator>::push_back(value_type&& __x)
571{
572 if (__end_ == __end_cap())
573 {
574 if (__begin_ > __first_)
575 {
576 difference_type __d = __begin_ - __first_;
577 __d = (__d + 1) / 2;
578 __end_ = _VSTD::move(__begin_, __end_, __begin_ - __d);
579 __begin_ -= __d;
580 }
581 else
582 {
583 size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1);
584 __split_buffer<value_type, __alloc_rr&> __t(__c, __c / 4, __alloc());
585 __t.__construct_at_end(move_iterator<pointer>(__begin_),
586 move_iterator<pointer>(__end_));
587 _VSTD::swap(__first_, __t.__first_);
588 _VSTD::swap(__begin_, __t.__begin_);
589 _VSTD::swap(__end_, __t.__end_);
590 _VSTD::swap(__end_cap(), __t.__end_cap());
591 }
592 }
593 __alloc_traits::construct(__alloc(), _VSTD::__to_address(__end_),
594 _VSTD::move(__x));
595 ++__end_;
596}
597
598template <class _Tp, class _Allocator>
599template <class... _Args>
600void
601__split_buffer<_Tp, _Allocator>::emplace_back(_Args&&... __args)
602{
603 if (__end_ == __end_cap())
604 {
605 if (__begin_ > __first_)
606 {
607 difference_type __d = __begin_ - __first_;
608 __d = (__d + 1) / 2;
609 __end_ = _VSTD::move(__begin_, __end_, __begin_ - __d);
610 __begin_ -= __d;
611 }
612 else
613 {
614 size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1);
615 __split_buffer<value_type, __alloc_rr&> __t(__c, __c / 4, __alloc());
616 __t.__construct_at_end(move_iterator<pointer>(__begin_),
617 move_iterator<pointer>(__end_));
618 _VSTD::swap(__first_, __t.__first_);
619 _VSTD::swap(__begin_, __t.__begin_);
620 _VSTD::swap(__end_, __t.__end_);
621 _VSTD::swap(__end_cap(), __t.__end_cap());
622 }
623 }
624 __alloc_traits::construct(__alloc(), _VSTD::__to_address(__end_),
625 _VSTD::forward<_Args>(__args)...);
626 ++__end_;
627}
628
629#endif // _LIBCPP_CXX03_LANG
630
631template <class _Tp, class _Allocator>
632inline _LIBCPP_INLINE_VISIBILITY
633void
634swap(__split_buffer<_Tp, _Allocator>& __x, __split_buffer<_Tp, _Allocator>& __y)
635 _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
636{
637 __x.swap(__y);
638}
639
640_LIBCPP_END_NAMESPACE_STD
641
642_LIBCPP_POP_MACROS
643
644#endif // _LIBCPP_SPLIT_BUFFER
645