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