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 19 template <bool> 20 class __split_buffer_common 21 { 22 protected: 23 void __throw_length_error() const; 24 void __throw_out_of_range() const; 25 }; 26 27 template <class _Tp, class _Allocator = allocator<_Tp> > 28 struct __split_buffer 29 : private __split_buffer_common<true> 30 { 31 private: 32 __split_buffer(const __split_buffer&); 33 __split_buffer& operator=(const __split_buffer&); 34 public: 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_input_iterator<_InputIter>::value && 120 !__is_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_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; 152 153 private: 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 }; 165 166 template <class _Tp, class _Allocator> 167 bool 168 __split_buffer<_Tp, _Allocator>::__invariants() const 169 { 170 if (__first_ == nullptr) 171 { 172 if (__begin_ != nullptr) 173 return false; 174 if (__end_ != nullptr) 175 return false; 176 if (__end_cap() != nullptr) 177 return false; 178 } 179 else 180 { 181 if (__begin_ < __first_) 182 return false; 183 if (__end_ < __begin_) 184 return false; 185 if (__end_cap() < __end_) 186 return false; 187 } 188 return true; 189 } 190 191 // Default constructs __n objects starting at __end_ 192 // throws if construction throws 193 // Precondition: __n > 0 194 // Precondition: size() + __n <= capacity() 195 // Postcondition: size() == size() + __n 196 template <class _Tp, class _Allocator> 197 void 198 __split_buffer<_Tp, _Allocator>::__construct_at_end(size_type __n) 199 { 200 __alloc_rr& __a = this->__alloc(); 201 do 202 { 203 __alloc_traits::construct(__a, _VSTD::__to_raw_pointer(this->__end_)); 204 ++this->__end_; 205 --__n; 206 } while (__n > 0); 207 } 208 209 // Copy constructs __n objects starting at __end_ from __x 210 // throws if construction throws 211 // Precondition: __n > 0 212 // Precondition: size() + __n <= capacity() 213 // Postcondition: size() == old size() + __n 214 // Postcondition: [i] == __x for all i in [size() - __n, __n) 215 template <class _Tp, class _Allocator> 216 void 217 __split_buffer<_Tp, _Allocator>::__construct_at_end(size_type __n, const_reference __x) 218 { 219 __alloc_rr& __a = this->__alloc(); 220 do 221 { 222 __alloc_traits::construct(__a, _VSTD::__to_raw_pointer(this->__end_), __x); 223 ++this->__end_; 224 --__n; 225 } while (__n > 0); 226 } 227 228 template <class _Tp, class _Allocator> 229 template <class _InputIter> 230 typename enable_if 231 < 232 __is_input_iterator<_InputIter>::value && 233 !__is_forward_iterator<_InputIter>::value, 234 void 235 >::type 236 __split_buffer<_Tp, _Allocator>::__construct_at_end(_InputIter __first, _InputIter __last) 237 { 238 __alloc_rr& __a = this->__alloc(); 239 for (; __first != __last; ++__first) 240 { 241 if (__end_ == __end_cap()) 242 { 243 size_type __old_cap = __end_cap() - __first_; 244 size_type __new_cap = _VSTD::max<size_type>(2 * __old_cap, 8); 245 __split_buffer __buf(__new_cap, 0, __a); 246 for (pointer __p = __begin_; __p != __end_; ++__p, ++__buf.__end_) 247 __alloc_traits::construct(__buf.__alloc(), 248 _VSTD::__to_raw_pointer(__buf.__end_), _VSTD::move(*__p)); 249 swap(__buf); 250 } 251 __alloc_traits::construct(__a, _VSTD::__to_raw_pointer(this->__end_), *__first); 252 ++this->__end_; 253 } 254 } 255 256 template <class _Tp, class _Allocator> 257 template <class _ForwardIterator> 258 typename enable_if 259 < 260 __is_forward_iterator<_ForwardIterator>::value, 261 void 262 >::type 263 __split_buffer<_Tp, _Allocator>::__construct_at_end(_ForwardIterator __first, _ForwardIterator __last) 264 { 265 __alloc_rr& __a = this->__alloc(); 266 for (; __first != __last; ++__first) 267 { 268 __alloc_traits::construct(__a, _VSTD::__to_raw_pointer(this->__end_), *__first); 269 ++this->__end_; 270 } 271 } 272 273 template <class _Tp, class _Allocator> 274 inline 275 void 276 __split_buffer<_Tp, _Allocator>::__destruct_at_begin(pointer __new_begin, false_type) 277 { 278 while (__begin_ != __new_begin) 279 __alloc_traits::destroy(__alloc(), __to_raw_pointer(__begin_++)); 280 } 281 282 template <class _Tp, class _Allocator> 283 inline 284 void 285 __split_buffer<_Tp, _Allocator>::__destruct_at_begin(pointer __new_begin, true_type) 286 { 287 __begin_ = __new_begin; 288 } 289 290 template <class _Tp, class _Allocator> 291 inline _LIBCPP_INLINE_VISIBILITY 292 void 293 __split_buffer<_Tp, _Allocator>::__destruct_at_end(pointer __new_last, false_type) _NOEXCEPT 294 { 295 while (__new_last != __end_) 296 __alloc_traits::destroy(__alloc(), __to_raw_pointer(--__end_)); 297 } 298 299 template <class _Tp, class _Allocator> 300 inline _LIBCPP_INLINE_VISIBILITY 301 void 302 __split_buffer<_Tp, _Allocator>::__destruct_at_end(pointer __new_last, true_type) _NOEXCEPT 303 { 304 __end_ = __new_last; 305 } 306 307 template <class _Tp, class _Allocator> 308 __split_buffer<_Tp, _Allocator>::__split_buffer(size_type __cap, size_type __start, __alloc_rr& __a) 309 : __end_cap_(nullptr, __a) 310 { 311 __first_ = __cap != 0 ? __alloc_traits::allocate(__alloc(), __cap) : nullptr; 312 __begin_ = __end_ = __first_ + __start; 313 __end_cap() = __first_ + __cap; 314 } 315 316 template <class _Tp, class _Allocator> 317 inline 318 __split_buffer<_Tp, _Allocator>::__split_buffer() 319 _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value) 320 : __first_(nullptr), __begin_(nullptr), __end_(nullptr), __end_cap_(nullptr) 321 { 322 } 323 324 template <class _Tp, class _Allocator> 325 inline 326 __split_buffer<_Tp, _Allocator>::__split_buffer(__alloc_rr& __a) 327 : __first_(nullptr), __begin_(nullptr), __end_(nullptr), __end_cap_(nullptr, __a) 328 { 329 } 330 331 template <class _Tp, class _Allocator> 332 inline 333 __split_buffer<_Tp, _Allocator>::__split_buffer(const __alloc_rr& __a) 334 : __first_(nullptr), __begin_(nullptr), __end_(nullptr), __end_cap_(nullptr, __a) 335 { 336 } 337 338 template <class _Tp, class _Allocator> 339 __split_buffer<_Tp, _Allocator>::~__split_buffer() 340 { 341 clear(); 342 if (__first_) 343 __alloc_traits::deallocate(__alloc(), __first_, capacity()); 344 } 345 346 #ifndef _LIBCPP_CXX03_LANG 347 348 template <class _Tp, class _Allocator> 349 __split_buffer<_Tp, _Allocator>::__split_buffer(__split_buffer&& __c) 350 _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value) 351 : __first_(_VSTD::move(__c.__first_)), 352 __begin_(_VSTD::move(__c.__begin_)), 353 __end_(_VSTD::move(__c.__end_)), 354 __end_cap_(_VSTD::move(__c.__end_cap_)) 355 { 356 __c.__first_ = nullptr; 357 __c.__begin_ = nullptr; 358 __c.__end_ = nullptr; 359 __c.__end_cap() = nullptr; 360 } 361 362 template <class _Tp, class _Allocator> 363 __split_buffer<_Tp, _Allocator>::__split_buffer(__split_buffer&& __c, const __alloc_rr& __a) 364 : __end_cap_(__second_tag(), __a) 365 { 366 if (__a == __c.__alloc()) 367 { 368 __first_ = __c.__first_; 369 __begin_ = __c.__begin_; 370 __end_ = __c.__end_; 371 __end_cap() = __c.__end_cap(); 372 __c.__first_ = nullptr; 373 __c.__begin_ = nullptr; 374 __c.__end_ = nullptr; 375 __c.__end_cap() = nullptr; 376 } 377 else 378 { 379 size_type __cap = __c.size(); 380 __first_ = __alloc_traits::allocate(__alloc(), __cap); 381 __begin_ = __end_ = __first_; 382 __end_cap() = __first_ + __cap; 383 typedef move_iterator<iterator> _Ip; 384 __construct_at_end(_Ip(__c.begin()), _Ip(__c.end())); 385 } 386 } 387 388 template <class _Tp, class _Allocator> 389 __split_buffer<_Tp, _Allocator>& 390 __split_buffer<_Tp, _Allocator>::operator=(__split_buffer&& __c) 391 _NOEXCEPT_((__alloc_traits::propagate_on_container_move_assignment::value && 392 is_nothrow_move_assignable<allocator_type>::value) || 393 !__alloc_traits::propagate_on_container_move_assignment::value) 394 { 395 clear(); 396 shrink_to_fit(); 397 __first_ = __c.__first_; 398 __begin_ = __c.__begin_; 399 __end_ = __c.__end_; 400 __end_cap() = __c.__end_cap(); 401 __move_assign_alloc(__c, 402 integral_constant<bool, 403 __alloc_traits::propagate_on_container_move_assignment::value>()); 404 __c.__first_ = __c.__begin_ = __c.__end_ = __c.__end_cap() = nullptr; 405 return *this; 406 } 407 408 #endif // _LIBCPP_CXX03_LANG 409 410 template <class _Tp, class _Allocator> 411 void 412 __split_buffer<_Tp, _Allocator>::swap(__split_buffer& __x) 413 _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value|| 414 __is_nothrow_swappable<__alloc_rr>::value) 415 { 416 _VSTD::swap(__first_, __x.__first_); 417 _VSTD::swap(__begin_, __x.__begin_); 418 _VSTD::swap(__end_, __x.__end_); 419 _VSTD::swap(__end_cap(), __x.__end_cap()); 420 __swap_allocator(__alloc(), __x.__alloc()); 421 } 422 423 template <class _Tp, class _Allocator> 424 void 425 __split_buffer<_Tp, _Allocator>::reserve(size_type __n) 426 { 427 if (__n < capacity()) 428 { 429 __split_buffer<value_type, __alloc_rr&> __t(__n, 0, __alloc()); 430 __t.__construct_at_end(move_iterator<pointer>(__begin_), 431 move_iterator<pointer>(__end_)); 432 _VSTD::swap(__first_, __t.__first_); 433 _VSTD::swap(__begin_, __t.__begin_); 434 _VSTD::swap(__end_, __t.__end_); 435 _VSTD::swap(__end_cap(), __t.__end_cap()); 436 } 437 } 438 439 template <class _Tp, class _Allocator> 440 void 441 __split_buffer<_Tp, _Allocator>::shrink_to_fit() _NOEXCEPT 442 { 443 if (capacity() > size()) 444 { 445 #ifndef _LIBCPP_NO_EXCEPTIONS 446 try 447 { 448 #endif // _LIBCPP_NO_EXCEPTIONS 449 __split_buffer<value_type, __alloc_rr&> __t(size(), 0, __alloc()); 450 __t.__construct_at_end(move_iterator<pointer>(__begin_), 451 move_iterator<pointer>(__end_)); 452 __t.__end_ = __t.__begin_ + (__end_ - __begin_); 453 _VSTD::swap(__first_, __t.__first_); 454 _VSTD::swap(__begin_, __t.__begin_); 455 _VSTD::swap(__end_, __t.__end_); 456 _VSTD::swap(__end_cap(), __t.__end_cap()); 457 #ifndef _LIBCPP_NO_EXCEPTIONS 458 } 459 catch (...) 460 { 461 } 462 #endif // _LIBCPP_NO_EXCEPTIONS 463 } 464 } 465 466 template <class _Tp, class _Allocator> 467 void 468 __split_buffer<_Tp, _Allocator>::push_front(const_reference __x) 469 { 470 if (__begin_ == __first_) 471 { 472 if (__end_ < __end_cap()) 473 { 474 difference_type __d = __end_cap() - __end_; 475 __d = (__d + 1) / 2; 476 __begin_ = _VSTD::move_backward(__begin_, __end_, __end_ + __d); 477 __end_ += __d; 478 } 479 else 480 { 481 size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1); 482 __split_buffer<value_type, __alloc_rr&> __t(__c, (__c + 3) / 4, __alloc()); 483 __t.__construct_at_end(move_iterator<pointer>(__begin_), 484 move_iterator<pointer>(__end_)); 485 _VSTD::swap(__first_, __t.__first_); 486 _VSTD::swap(__begin_, __t.__begin_); 487 _VSTD::swap(__end_, __t.__end_); 488 _VSTD::swap(__end_cap(), __t.__end_cap()); 489 } 490 } 491 __alloc_traits::construct(__alloc(), _VSTD::__to_raw_pointer(__begin_-1), __x); 492 --__begin_; 493 } 494 495 #ifndef _LIBCPP_CXX03_LANG 496 497 template <class _Tp, class _Allocator> 498 void 499 __split_buffer<_Tp, _Allocator>::push_front(value_type&& __x) 500 { 501 if (__begin_ == __first_) 502 { 503 if (__end_ < __end_cap()) 504 { 505 difference_type __d = __end_cap() - __end_; 506 __d = (__d + 1) / 2; 507 __begin_ = _VSTD::move_backward(__begin_, __end_, __end_ + __d); 508 __end_ += __d; 509 } 510 else 511 { 512 size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1); 513 __split_buffer<value_type, __alloc_rr&> __t(__c, (__c + 3) / 4, __alloc()); 514 __t.__construct_at_end(move_iterator<pointer>(__begin_), 515 move_iterator<pointer>(__end_)); 516 _VSTD::swap(__first_, __t.__first_); 517 _VSTD::swap(__begin_, __t.__begin_); 518 _VSTD::swap(__end_, __t.__end_); 519 _VSTD::swap(__end_cap(), __t.__end_cap()); 520 } 521 } 522 __alloc_traits::construct(__alloc(), _VSTD::__to_raw_pointer(__begin_-1), 523 _VSTD::move(__x)); 524 --__begin_; 525 } 526 527 #endif // _LIBCPP_CXX03_LANG 528 529 template <class _Tp, class _Allocator> 530 inline _LIBCPP_INLINE_VISIBILITY 531 void 532 __split_buffer<_Tp, _Allocator>::push_back(const_reference __x) 533 { 534 if (__end_ == __end_cap()) 535 { 536 if (__begin_ > __first_) 537 { 538 difference_type __d = __begin_ - __first_; 539 __d = (__d + 1) / 2; 540 __end_ = _VSTD::move(__begin_, __end_, __begin_ - __d); 541 __begin_ -= __d; 542 } 543 else 544 { 545 size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1); 546 __split_buffer<value_type, __alloc_rr&> __t(__c, __c / 4, __alloc()); 547 __t.__construct_at_end(move_iterator<pointer>(__begin_), 548 move_iterator<pointer>(__end_)); 549 _VSTD::swap(__first_, __t.__first_); 550 _VSTD::swap(__begin_, __t.__begin_); 551 _VSTD::swap(__end_, __t.__end_); 552 _VSTD::swap(__end_cap(), __t.__end_cap()); 553 } 554 } 555 __alloc_traits::construct(__alloc(), _VSTD::__to_raw_pointer(__end_), __x); 556 ++__end_; 557 } 558 559 #ifndef _LIBCPP_CXX03_LANG 560 561 template <class _Tp, class _Allocator> 562 void 563 __split_buffer<_Tp, _Allocator>::push_back(value_type&& __x) 564 { 565 if (__end_ == __end_cap()) 566 { 567 if (__begin_ > __first_) 568 { 569 difference_type __d = __begin_ - __first_; 570 __d = (__d + 1) / 2; 571 __end_ = _VSTD::move(__begin_, __end_, __begin_ - __d); 572 __begin_ -= __d; 573 } 574 else 575 { 576 size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1); 577 __split_buffer<value_type, __alloc_rr&> __t(__c, __c / 4, __alloc()); 578 __t.__construct_at_end(move_iterator<pointer>(__begin_), 579 move_iterator<pointer>(__end_)); 580 _VSTD::swap(__first_, __t.__first_); 581 _VSTD::swap(__begin_, __t.__begin_); 582 _VSTD::swap(__end_, __t.__end_); 583 _VSTD::swap(__end_cap(), __t.__end_cap()); 584 } 585 } 586 __alloc_traits::construct(__alloc(), _VSTD::__to_raw_pointer(__end_), 587 _VSTD::move(__x)); 588 ++__end_; 589 } 590 591 template <class _Tp, class _Allocator> 592 template <class... _Args> 593 void 594 __split_buffer<_Tp, _Allocator>::emplace_back(_Args&&... __args) 595 { 596 if (__end_ == __end_cap()) 597 { 598 if (__begin_ > __first_) 599 { 600 difference_type __d = __begin_ - __first_; 601 __d = (__d + 1) / 2; 602 __end_ = _VSTD::move(__begin_, __end_, __begin_ - __d); 603 __begin_ -= __d; 604 } 605 else 606 { 607 size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1); 608 __split_buffer<value_type, __alloc_rr&> __t(__c, __c / 4, __alloc()); 609 __t.__construct_at_end(move_iterator<pointer>(__begin_), 610 move_iterator<pointer>(__end_)); 611 _VSTD::swap(__first_, __t.__first_); 612 _VSTD::swap(__begin_, __t.__begin_); 613 _VSTD::swap(__end_, __t.__end_); 614 _VSTD::swap(__end_cap(), __t.__end_cap()); 615 } 616 } 617 __alloc_traits::construct(__alloc(), _VSTD::__to_raw_pointer(__end_), 618 _VSTD::forward<_Args>(__args)...); 619 ++__end_; 620 } 621 622 #endif // _LIBCPP_CXX03_LANG 623 624 template <class _Tp, class _Allocator> 625 inline _LIBCPP_INLINE_VISIBILITY 626 void 627 swap(__split_buffer<_Tp, _Allocator>& __x, __split_buffer<_Tp, _Allocator>& __y) 628 _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y))) 629 { 630 __x.swap(__y); 631 } 632 633 _LIBCPP_END_NAMESPACE_STD 634 635 _LIBCPP_POP_MACROS 636 637 #endif // _LIBCPP_SPLIT_BUFFER 638
