2 #ifndef _LIBCPP_SPLIT_BUFFER
3 #define _LIBCPP_SPLIT_BUFFER
9 #include <__undef_min_max>
11 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
12 #pragma GCC system_header
15 _LIBCPP_BEGIN_NAMESPACE_STD
18 class __split_buffer_common
21 void __throw_length_error() const;
22 void __throw_out_of_range() const;
25 template <class _Tp, class _Allocator = allocator<_Tp> >
27 : private __split_buffer_common<true>
30 __split_buffer(const __split_buffer&);
31 __split_buffer& operator=(const __split_buffer&);
33 typedef _Tp value_type;
34 typedef _Allocator allocator_type;
35 typedef typename remove_reference<allocator_type>::type __alloc_rr;
36 typedef allocator_traits<__alloc_rr> __alloc_traits;
37 typedef value_type& reference;
38 typedef const value_type& const_reference;
39 typedef typename __alloc_traits::size_type size_type;
40 typedef typename __alloc_traits::difference_type difference_type;
41 typedef typename __alloc_traits::pointer pointer;
42 typedef typename __alloc_traits::const_pointer const_pointer;
43 typedef pointer iterator;
44 typedef const_pointer const_iterator;
49 __compressed_pair<pointer, allocator_type> __end_cap_;
51 typedef typename add_lvalue_reference<allocator_type>::type __alloc_ref;
52 typedef typename add_lvalue_reference<allocator_type>::type __alloc_const_ref;
54 _LIBCPP_INLINE_VISIBILITY __alloc_rr& __alloc() _NOEXCEPT {return __end_cap_.second();}
55 _LIBCPP_INLINE_VISIBILITY const __alloc_rr& __alloc() const _NOEXCEPT {return __end_cap_.second();}
56 _LIBCPP_INLINE_VISIBILITY pointer& __end_cap() _NOEXCEPT {return __end_cap_.first();}
57 _LIBCPP_INLINE_VISIBILITY const pointer& __end_cap() const _NOEXCEPT {return __end_cap_.first();}
60 _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value);
61 explicit __split_buffer(__alloc_rr& __a);
62 explicit __split_buffer(const __alloc_rr& __a);
63 __split_buffer(size_type __cap, size_type __start, __alloc_rr& __a);
66 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
67 __split_buffer(__split_buffer&& __c)
68 _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value);
69 __split_buffer(__split_buffer&& __c, const __alloc_rr& __a);
70 __split_buffer& operator=(__split_buffer&& __c)
71 _NOEXCEPT_((__alloc_traits::propagate_on_container_move_assignment::value &&
72 is_nothrow_move_assignable<allocator_type>::value) ||
73 !__alloc_traits::propagate_on_container_move_assignment::value);
74 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
76 _LIBCPP_INLINE_VISIBILITY iterator begin() _NOEXCEPT {return __begin_;}
77 _LIBCPP_INLINE_VISIBILITY const_iterator begin() const _NOEXCEPT {return __begin_;}
78 _LIBCPP_INLINE_VISIBILITY iterator end() _NOEXCEPT {return __end_;}
79 _LIBCPP_INLINE_VISIBILITY const_iterator end() const _NOEXCEPT {return __end_;}
81 _LIBCPP_INLINE_VISIBILITY
82 void clear() _NOEXCEPT
83 {__destruct_at_end(__begin_);}
84 _LIBCPP_INLINE_VISIBILITY size_type size() const {return static_cast<size_type>(__end_ - __begin_);}
85 _LIBCPP_INLINE_VISIBILITY bool empty() const {return __end_ == __begin_;}
86 _LIBCPP_INLINE_VISIBILITY size_type capacity() const {return static_cast<size_type>(__end_cap() - __first_);}
87 _LIBCPP_INLINE_VISIBILITY size_type __front_spare() const {return static_cast<size_type>(__begin_ - __first_);}
88 _LIBCPP_INLINE_VISIBILITY size_type __back_spare() const {return static_cast<size_type>(__end_cap() - __end_);}
90 _LIBCPP_INLINE_VISIBILITY reference front() {return *__begin_;}
91 _LIBCPP_INLINE_VISIBILITY const_reference front() const {return *__begin_;}
92 _LIBCPP_INLINE_VISIBILITY reference back() {return *(__end_ - 1);}
93 _LIBCPP_INLINE_VISIBILITY const_reference back() const {return *(__end_ - 1);}
95 void reserve(size_type __n);
96 void shrink_to_fit() _NOEXCEPT;
97 void push_front(const_reference __x);
98 _LIBCPP_INLINE_VISIBILITY void push_back(const_reference __x);
99 #if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
100 void push_front(value_type&& __x);
101 void push_back(value_type&& __x);
102 #if !defined(_LIBCPP_HAS_NO_VARIADICS)
103 template <class... _Args>
104 void emplace_back(_Args&&... __args);
105 #endif // !defined(_LIBCPP_HAS_NO_VARIADICS)
106 #endif // !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
108 _LIBCPP_INLINE_VISIBILITY void pop_front() {__destruct_at_begin(__begin_+1);}
109 _LIBCPP_INLINE_VISIBILITY void pop_back() {__destruct_at_end(__end_-1);}
111 void __construct_at_end(size_type __n);
112 void __construct_at_end(size_type __n, const_reference __x);
113 template <class _InputIter>
116 __is_input_iterator<_InputIter>::value &&
117 !__is_forward_iterator<_InputIter>::value,
120 __construct_at_end(_InputIter __first, _InputIter __last);
121 template <class _ForwardIterator>
124 __is_forward_iterator<_ForwardIterator>::value,
127 __construct_at_end(_ForwardIterator __first, _ForwardIterator __last);
129 _LIBCPP_INLINE_VISIBILITY void __destruct_at_begin(pointer __new_begin)
130 {__destruct_at_begin(__new_begin, is_trivially_destructible<value_type>());}
131 void __destruct_at_begin(pointer __new_begin, false_type);
132 void __destruct_at_begin(pointer __new_begin, true_type);
134 _LIBCPP_INLINE_VISIBILITY
135 void __destruct_at_end(pointer __new_last) _NOEXCEPT
136 {__destruct_at_end(__new_last, false_type());}
137 _LIBCPP_INLINE_VISIBILITY
138 void __destruct_at_end(pointer __new_last, false_type) _NOEXCEPT;
139 _LIBCPP_INLINE_VISIBILITY
140 void __destruct_at_end(pointer __new_last, true_type) _NOEXCEPT;
142 void swap(__split_buffer& __x)
143 _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value||
144 __is_nothrow_swappable<__alloc_rr>::value);
146 bool __invariants() const;
149 _LIBCPP_INLINE_VISIBILITY
150 void __move_assign_alloc(__split_buffer& __c, true_type)
151 _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
153 __alloc() = _VSTD::move(__c.__alloc());
156 _LIBCPP_INLINE_VISIBILITY
157 void __move_assign_alloc(__split_buffer&, false_type) _NOEXCEPT
161 template <class _Tp, class _Allocator>
163 __split_buffer<_Tp, _Allocator>::__invariants() const
165 if (__first_ == nullptr)
167 if (__begin_ != nullptr)
169 if (__end_ != nullptr)
171 if (__end_cap() != nullptr)
176 if (__begin_ < __first_)
178 if (__end_ < __begin_)
180 if (__end_cap() < __end_)
186 // Default constructs __n objects starting at __end_
187 // throws if construction throws
188 // Precondition: __n > 0
189 // Precondition: size() + __n <= capacity()
190 // Postcondition: size() == size() + __n
191 template <class _Tp, class _Allocator>
193 __split_buffer<_Tp, _Allocator>::__construct_at_end(size_type __n)
195 __alloc_rr& __a = this->__alloc();
198 __alloc_traits::construct(__a, _VSTD::__to_raw_pointer(this->__end_));
204 // Copy constructs __n objects starting at __end_ from __x
205 // throws if construction throws
206 // Precondition: __n > 0
207 // Precondition: size() + __n <= capacity()
208 // Postcondition: size() == old size() + __n
209 // Postcondition: [i] == __x for all i in [size() - __n, __n)
210 template <class _Tp, class _Allocator>
212 __split_buffer<_Tp, _Allocator>::__construct_at_end(size_type __n, const_reference __x)
214 __alloc_rr& __a = this->__alloc();
217 __alloc_traits::construct(__a, _VSTD::__to_raw_pointer(this->__end_), __x);
223 template <class _Tp, class _Allocator>
224 template <class _InputIter>
227 __is_input_iterator<_InputIter>::value &&
228 !__is_forward_iterator<_InputIter>::value,
231 __split_buffer<_Tp, _Allocator>::__construct_at_end(_InputIter __first, _InputIter __last)
233 __alloc_rr& __a = this->__alloc();
234 for (; __first != __last; ++__first)
236 if (__end_ == __end_cap())
238 size_type __old_cap = __end_cap() - __first_;
239 size_type __new_cap = _VSTD::max<size_type>(2 * __old_cap, 8);
240 __split_buffer __buf(__new_cap, 0, __a);
241 for (pointer __p = __begin_; __p != __end_; ++__p, ++__buf.__end_)
242 __alloc_traits::construct(__buf.__alloc(),
243 _VSTD::__to_raw_pointer(__buf.__end_), _VSTD::move(*__p));
246 __alloc_traits::construct(__a, _VSTD::__to_raw_pointer(this->__end_), *__first);
251 template <class _Tp, class _Allocator>
252 template <class _ForwardIterator>
255 __is_forward_iterator<_ForwardIterator>::value,
258 __split_buffer<_Tp, _Allocator>::__construct_at_end(_ForwardIterator __first, _ForwardIterator __last)
260 __alloc_rr& __a = this->__alloc();
261 for (; __first != __last; ++__first)
263 __alloc_traits::construct(__a, _VSTD::__to_raw_pointer(this->__end_), *__first);
268 template <class _Tp, class _Allocator>
269 inline _LIBCPP_INLINE_VISIBILITY
271 __split_buffer<_Tp, _Allocator>::__destruct_at_begin(pointer __new_begin, false_type)
273 while (__begin_ != __new_begin)
274 __alloc_traits::destroy(__alloc(), __to_raw_pointer(__begin_++));
277 template <class _Tp, class _Allocator>
278 inline _LIBCPP_INLINE_VISIBILITY
280 __split_buffer<_Tp, _Allocator>::__destruct_at_begin(pointer __new_begin, true_type)
282 __begin_ = __new_begin;
285 template <class _Tp, class _Allocator>
286 inline _LIBCPP_INLINE_VISIBILITY
288 __split_buffer<_Tp, _Allocator>::__destruct_at_end(pointer __new_last, false_type) _NOEXCEPT
290 while (__new_last != __end_)
291 __alloc_traits::destroy(__alloc(), __to_raw_pointer(--__end_));
294 template <class _Tp, class _Allocator>
295 inline _LIBCPP_INLINE_VISIBILITY
297 __split_buffer<_Tp, _Allocator>::__destruct_at_end(pointer __new_last, true_type) _NOEXCEPT
302 template <class _Tp, class _Allocator>
303 __split_buffer<_Tp, _Allocator>::__split_buffer(size_type __cap, size_type __start, __alloc_rr& __a)
304 : __end_cap_(nullptr, __a)
306 __first_ = __cap != 0 ? __alloc_traits::allocate(__alloc(), __cap) : nullptr;
307 __begin_ = __end_ = __first_ + __start;
308 __end_cap() = __first_ + __cap;
311 template <class _Tp, class _Allocator>
312 inline _LIBCPP_INLINE_VISIBILITY
313 __split_buffer<_Tp, _Allocator>::__split_buffer()
314 _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
315 : __first_(nullptr), __begin_(nullptr), __end_(nullptr), __end_cap_(nullptr)
319 template <class _Tp, class _Allocator>
320 inline _LIBCPP_INLINE_VISIBILITY
321 __split_buffer<_Tp, _Allocator>::__split_buffer(__alloc_rr& __a)
322 : __first_(nullptr), __begin_(nullptr), __end_(nullptr), __end_cap_(nullptr, __a)
326 template <class _Tp, class _Allocator>
327 inline _LIBCPP_INLINE_VISIBILITY
328 __split_buffer<_Tp, _Allocator>::__split_buffer(const __alloc_rr& __a)
329 : __first_(nullptr), __begin_(nullptr), __end_(nullptr), __end_cap_(nullptr, __a)
333 template <class _Tp, class _Allocator>
334 __split_buffer<_Tp, _Allocator>::~__split_buffer()
338 __alloc_traits::deallocate(__alloc(), __first_, capacity());
341 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
343 template <class _Tp, class _Allocator>
344 __split_buffer<_Tp, _Allocator>::__split_buffer(__split_buffer&& __c)
345 _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value)
346 : __first_(_VSTD::move(__c.__first_)),
347 __begin_(_VSTD::move(__c.__begin_)),
348 __end_(_VSTD::move(__c.__end_)),
349 __end_cap_(_VSTD::move(__c.__end_cap_))
351 __c.__first_ = nullptr;
352 __c.__begin_ = nullptr;
353 __c.__end_ = nullptr;
354 __c.__end_cap() = nullptr;
357 template <class _Tp, class _Allocator>
358 __split_buffer<_Tp, _Allocator>::__split_buffer(__split_buffer&& __c, const __alloc_rr& __a)
361 if (__a == __c.__alloc())
363 __first_ = __c.__first_;
364 __begin_ = __c.__begin_;
366 __end_cap() = __c.__end_cap();
367 __c.__first_ = nullptr;
368 __c.__begin_ = nullptr;
369 __c.__end_ = nullptr;
370 __c.__end_cap() = nullptr;
374 size_type __cap = __c.size();
375 __first_ = __alloc_traits::allocate(__alloc(), __cap);
376 __begin_ = __end_ = __first_;
377 __end_cap() = __first_ + __cap;
378 typedef move_iterator<iterator> _Ip;
379 __construct_at_end(_Ip(__c.begin()), _Ip(__c.end()));
383 template <class _Tp, class _Allocator>
384 __split_buffer<_Tp, _Allocator>&
385 __split_buffer<_Tp, _Allocator>::operator=(__split_buffer&& __c)
386 _NOEXCEPT_((__alloc_traits::propagate_on_container_move_assignment::value &&
387 is_nothrow_move_assignable<allocator_type>::value) ||
388 !__alloc_traits::propagate_on_container_move_assignment::value)
392 __first_ = __c.__first_;
393 __begin_ = __c.__begin_;
395 __end_cap() = __c.__end_cap();
396 __move_assign_alloc(__c,
397 integral_constant<bool,
398 __alloc_traits::propagate_on_container_move_assignment::value>());
399 __c.__first_ = __c.__begin_ = __c.__end_ = __c.__end_cap() = nullptr;
403 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
405 template <class _Tp, class _Allocator>
407 __split_buffer<_Tp, _Allocator>::swap(__split_buffer& __x)
408 _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value||
409 __is_nothrow_swappable<__alloc_rr>::value)
411 _VSTD::swap(__first_, __x.__first_);
412 _VSTD::swap(__begin_, __x.__begin_);
413 _VSTD::swap(__end_, __x.__end_);
414 _VSTD::swap(__end_cap(), __x.__end_cap());
415 __swap_allocator(__alloc(), __x.__alloc());
418 template <class _Tp, class _Allocator>
420 __split_buffer<_Tp, _Allocator>::reserve(size_type __n)
422 if (__n < capacity())
424 __split_buffer<value_type, __alloc_rr&> __t(__n, 0, __alloc());
425 __t.__construct_at_end(move_iterator<pointer>(__begin_),
426 move_iterator<pointer>(__end_));
427 _VSTD::swap(__first_, __t.__first_);
428 _VSTD::swap(__begin_, __t.__begin_);
429 _VSTD::swap(__end_, __t.__end_);
430 _VSTD::swap(__end_cap(), __t.__end_cap());
434 template <class _Tp, class _Allocator>
436 __split_buffer<_Tp, _Allocator>::shrink_to_fit() _NOEXCEPT
438 if (capacity() > size())
440 #ifndef _LIBCPP_NO_EXCEPTIONS
443 #endif // _LIBCPP_NO_EXCEPTIONS
444 __split_buffer<value_type, __alloc_rr&> __t(size(), 0, __alloc());
445 __t.__construct_at_end(move_iterator<pointer>(__begin_),
446 move_iterator<pointer>(__end_));
447 __t.__end_ = __t.__begin_ + (__end_ - __begin_);
448 _VSTD::swap(__first_, __t.__first_);
449 _VSTD::swap(__begin_, __t.__begin_);
450 _VSTD::swap(__end_, __t.__end_);
451 _VSTD::swap(__end_cap(), __t.__end_cap());
452 #ifndef _LIBCPP_NO_EXCEPTIONS
457 #endif // _LIBCPP_NO_EXCEPTIONS
461 template <class _Tp, class _Allocator>
463 __split_buffer<_Tp, _Allocator>::push_front(const_reference __x)
465 if (__begin_ == __first_)
467 if (__end_ < __end_cap())
469 difference_type __d = __end_cap() - __end_;
471 __begin_ = _VSTD::move_backward(__begin_, __end_, __end_ + __d);
476 size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1);
477 __split_buffer<value_type, __alloc_rr&> __t(__c, (__c + 3) / 4, __alloc());
478 __t.__construct_at_end(move_iterator<pointer>(__begin_),
479 move_iterator<pointer>(__end_));
480 _VSTD::swap(__first_, __t.__first_);
481 _VSTD::swap(__begin_, __t.__begin_);
482 _VSTD::swap(__end_, __t.__end_);
483 _VSTD::swap(__end_cap(), __t.__end_cap());
486 __alloc_traits::construct(__alloc(), _VSTD::__to_raw_pointer(__begin_-1), __x);
490 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
492 template <class _Tp, class _Allocator>
494 __split_buffer<_Tp, _Allocator>::push_front(value_type&& __x)
496 if (__begin_ == __first_)
498 if (__end_ < __end_cap())
500 difference_type __d = __end_cap() - __end_;
502 __begin_ = _VSTD::move_backward(__begin_, __end_, __end_ + __d);
507 size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1);
508 __split_buffer<value_type, __alloc_rr&> __t(__c, (__c + 3) / 4, __alloc());
509 __t.__construct_at_end(move_iterator<pointer>(__begin_),
510 move_iterator<pointer>(__end_));
511 _VSTD::swap(__first_, __t.__first_);
512 _VSTD::swap(__begin_, __t.__begin_);
513 _VSTD::swap(__end_, __t.__end_);
514 _VSTD::swap(__end_cap(), __t.__end_cap());
517 __alloc_traits::construct(__alloc(), _VSTD::__to_raw_pointer(__begin_-1),
522 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
524 template <class _Tp, class _Allocator>
525 inline _LIBCPP_INLINE_VISIBILITY
527 __split_buffer<_Tp, _Allocator>::push_back(const_reference __x)
529 if (__end_ == __end_cap())
531 if (__begin_ > __first_)
533 difference_type __d = __begin_ - __first_;
535 __end_ = _VSTD::move(__begin_, __end_, __begin_ - __d);
540 size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1);
541 __split_buffer<value_type, __alloc_rr&> __t(__c, __c / 4, __alloc());
542 __t.__construct_at_end(move_iterator<pointer>(__begin_),
543 move_iterator<pointer>(__end_));
544 _VSTD::swap(__first_, __t.__first_);
545 _VSTD::swap(__begin_, __t.__begin_);
546 _VSTD::swap(__end_, __t.__end_);
547 _VSTD::swap(__end_cap(), __t.__end_cap());
550 __alloc_traits::construct(__alloc(), _VSTD::__to_raw_pointer(__end_), __x);
554 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
556 template <class _Tp, class _Allocator>
558 __split_buffer<_Tp, _Allocator>::push_back(value_type&& __x)
560 if (__end_ == __end_cap())
562 if (__begin_ > __first_)
564 difference_type __d = __begin_ - __first_;
566 __end_ = _VSTD::move(__begin_, __end_, __begin_ - __d);
571 size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1);
572 __split_buffer<value_type, __alloc_rr&> __t(__c, __c / 4, __alloc());
573 __t.__construct_at_end(move_iterator<pointer>(__begin_),
574 move_iterator<pointer>(__end_));
575 _VSTD::swap(__first_, __t.__first_);
576 _VSTD::swap(__begin_, __t.__begin_);
577 _VSTD::swap(__end_, __t.__end_);
578 _VSTD::swap(__end_cap(), __t.__end_cap());
581 __alloc_traits::construct(__alloc(), _VSTD::__to_raw_pointer(__end_),
586 #ifndef _LIBCPP_HAS_NO_VARIADICS
588 template <class _Tp, class _Allocator>
589 template <class... _Args>
591 __split_buffer<_Tp, _Allocator>::emplace_back(_Args&&... __args)
593 if (__end_ == __end_cap())
595 if (__begin_ > __first_)
597 difference_type __d = __begin_ - __first_;
599 __end_ = _VSTD::move(__begin_, __end_, __begin_ - __d);
604 size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1);
605 __split_buffer<value_type, __alloc_rr&> __t(__c, __c / 4, __alloc());
606 __t.__construct_at_end(move_iterator<pointer>(__begin_),
607 move_iterator<pointer>(__end_));
608 _VSTD::swap(__first_, __t.__first_);
609 _VSTD::swap(__begin_, __t.__begin_);
610 _VSTD::swap(__end_, __t.__end_);
611 _VSTD::swap(__end_cap(), __t.__end_cap());
614 __alloc_traits::construct(__alloc(), _VSTD::__to_raw_pointer(__end_),
615 _VSTD::forward<_Args>(__args)...);
619 #endif // _LIBCPP_HAS_NO_VARIADICS
621 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
623 template <class _Tp, class _Allocator>
624 inline _LIBCPP_INLINE_VISIBILITY
626 swap(__split_buffer<_Tp, _Allocator>& __x, __split_buffer<_Tp, _Allocator>& __y)
627 _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
633 _LIBCPP_END_NAMESPACE_STD
635 #endif // _LIBCPP_SPLIT_BUFFER