1// -*- C++ -*- 2//===-------------------------- utility -----------------------------------===// 3// 4// The LLVM Compiler Infrastructure 5// 6// This file is dual licensed under the MIT and the University of Illinois Open 7// Source Licenses. See LICENSE.TXT for details. 8// 9//===----------------------------------------------------------------------===// 10 11#ifndef _LIBCPP_UTILITY 12#define _LIBCPP_UTILITY 13 14/* 15 utility synopsis 16 17namespace std 18{ 19 20template <class T> 21 void 22 swap(T& a, T& b); 23 24namespace rel_ops 25{ 26 template<class T> bool operator!=(const T&, const T&); 27 template<class T> bool operator> (const T&, const T&); 28 template<class T> bool operator<=(const T&, const T&); 29 template<class T> bool operator>=(const T&, const T&); 30} 31 32template<class T> 33void 34swap(T& a, T& b) noexcept(is_nothrow_move_constructible<T>::value && 35 is_nothrow_move_assignable<T>::value); 36 37template <class T, size_t N> 38void 39swap(T (&a)[N], T (&b)[N]) noexcept(noexcept(swap(*a, *b))); 40 41template <class T> T&& forward(typename remove_reference<T>::type& t) noexcept; // constexpr in C++14 42template <class T> T&& forward(typename remove_reference<T>::type&& t) noexcept; // constexpr in C++14 43 44template <class T> typename remove_reference<T>::type&& move(T&&) noexcept; // constexpr in C++14 45 46template <class T> 47 typename conditional 48 < 49 !is_nothrow_move_constructible<T>::value && is_copy_constructible<T>::value, 50 const T&, 51 T&& 52 >::type 53 move_if_noexcept(T& x) noexcept; // constexpr in C++14 54 55template <class T> constexpr add_const<T>_t& as_const(T& t) noexcept; // C++17 56template <class T> void as_const(const T&&) = delete; // C++17 57 58template <class T> typename add_rvalue_reference<T>::type declval() noexcept; 59 60template <class T1, class T2> 61struct pair 62{ 63 typedef T1 first_type; 64 typedef T2 second_type; 65 66 T1 first; 67 T2 second; 68 69 pair(const pair&) = default; 70 pair(pair&&) = default; 71 constexpr pair(); 72 pair(const T1& x, const T2& y); // constexpr in C++14 73 template <class U, class V> pair(U&& x, V&& y); // constexpr in C++14 74 template <class U, class V> pair(const pair<U, V>& p); // constexpr in C++14 75 template <class U, class V> pair(pair<U, V>&& p); // constexpr in C++14 76 template <class... Args1, class... Args2> 77 pair(piecewise_construct_t, tuple<Args1...> first_args, 78 tuple<Args2...> second_args); 79 80 template <class U, class V> pair& operator=(const pair<U, V>& p); 81 pair& operator=(pair&& p) noexcept(is_nothrow_move_assignable<T1>::value && 82 is_nothrow_move_assignable<T2>::value); 83 template <class U, class V> pair& operator=(pair<U, V>&& p); 84 85 void swap(pair& p) noexcept(is_nothrow_swappable_v<T1> && 86 is_nothrow_swappable_v<T2>); 87}; 88 89template <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 90template <class T1, class T2> bool operator!=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 91template <class T1, class T2> bool operator< (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 92template <class T1, class T2> bool operator> (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 93template <class T1, class T2> bool operator>=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 94template <class T1, class T2> bool operator<=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 95 96template <class T1, class T2> pair<V1, V2> make_pair(T1&&, T2&&); // constexpr in C++14 97template <class T1, class T2> 98void 99swap(pair<T1, T2>& x, pair<T1, T2>& y) noexcept(noexcept(x.swap(y))); 100 101struct piecewise_construct_t { }; 102constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t(); 103 104template <class T> class tuple_size; 105template <size_t I, class T> class tuple_element; 106 107template <class T1, class T2> struct tuple_size<pair<T1, T2> >; 108template <class T1, class T2> struct tuple_element<0, pair<T1, T2> >; 109template <class T1, class T2> struct tuple_element<1, pair<T1, T2> >; 110 111template<size_t I, class T1, class T2> 112 typename tuple_element<I, pair<T1, T2> >::type& 113 get(pair<T1, T2>&) noexcept; // constexpr in C++14 114 115template<size_t I, class T1, class T2> 116 const typename tuple_element<I, pair<T1, T2> >::type& 117 get(const pair<T1, T2>&) noexcept; // constexpr in C++14 118 119template<size_t I, class T1, class T2> 120 typename tuple_element<I, pair<T1, T2> >::type&& 121 get(pair<T1, T2>&&) noexcept; // constexpr in C++14 122 123template<size_t I, class T1, class T2> 124 const typename tuple_element<I, pair<T1, T2> >::type&& 125 get(const pair<T1, T2>&&) noexcept; // constexpr in C++14 126 127template<class T1, class T2> 128 constexpr T1& get(pair<T1, T2>&) noexcept; // C++14 129 130template<class T1, class T2> 131 constexpr const T1& get(const pair<T1, T2>&) noexcept; // C++14 132 133template<class T1, class T2> 134 constexpr T1&& get(pair<T1, T2>&&) noexcept; // C++14 135 136template<class T1, class T2> 137 constexpr const T1&& get(const pair<T1, T2>&&) noexcept; // C++14 138 139template<class T1, class T2> 140 constexpr T1& get(pair<T2, T1>&) noexcept; // C++14 141 142template<class T1, class T2> 143 constexpr const T1& get(const pair<T2, T1>&) noexcept; // C++14 144 145template<class T1, class T2> 146 constexpr T1&& get(pair<T2, T1>&&) noexcept; // C++14 147 148template<class T1, class T2> 149 constexpr const T1&& get(const pair<T2, T1>&&) noexcept; // C++14 150 151// C++14 152 153template<class T, T... I> 154struct integer_sequence 155{ 156 typedef T value_type; 157 158 static constexpr size_t size() noexcept; 159}; 160 161template<size_t... I> 162 using index_sequence = integer_sequence<size_t, I...>; 163 164template<class T, T N> 165 using make_integer_sequence = integer_sequence<T, 0, 1, ..., N-1>; 166template<size_t N> 167 using make_index_sequence = make_integer_sequence<size_t, N>; 168 169template<class... T> 170 using index_sequence_for = make_index_sequence<sizeof...(T)>; 171 172template<class T, class U=T> 173 T exchange(T& obj, U&& new_value); 174} // std 175 176*/ 177 178#include <__config> 179#include <__tuple> 180#include <type_traits> 181#include <initializer_list> 182 183#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 184#pragma GCC system_header 185#endif 186 187_LIBCPP_BEGIN_NAMESPACE_STD 188 189namespace rel_ops 190{ 191 192template<class _Tp> 193inline _LIBCPP_INLINE_VISIBILITY 194bool 195operator!=(const _Tp& __x, const _Tp& __y) 196{ 197 return !(__x == __y); 198} 199 200template<class _Tp> 201inline _LIBCPP_INLINE_VISIBILITY 202bool 203operator> (const _Tp& __x, const _Tp& __y) 204{ 205 return __y < __x; 206} 207 208template<class _Tp> 209inline _LIBCPP_INLINE_VISIBILITY 210bool 211operator<=(const _Tp& __x, const _Tp& __y) 212{ 213 return !(__y < __x); 214} 215 216template<class _Tp> 217inline _LIBCPP_INLINE_VISIBILITY 218bool 219operator>=(const _Tp& __x, const _Tp& __y) 220{ 221 return !(__x < __y); 222} 223 224} // rel_ops 225 226// swap_ranges 227 228 229template <class _ForwardIterator1, class _ForwardIterator2> 230inline _LIBCPP_INLINE_VISIBILITY 231_ForwardIterator2 232swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2) 233{ 234 for(; __first1 != __last1; ++__first1, (void) ++__first2) 235 swap(*__first1, *__first2); 236 return __first2; 237} 238 239// forward declared in <type_traits> 240template<class _Tp, size_t _Np> 241inline _LIBCPP_INLINE_VISIBILITY 242typename enable_if< 243 __is_swappable<_Tp>::value 244>::type 245swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value) 246{ 247 _VSTD::swap_ranges(__a, __a + _Np, __b); 248} 249 250template <class _Tp> 251inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 252#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 253typename conditional 254< 255 !is_nothrow_move_constructible<_Tp>::value && is_copy_constructible<_Tp>::value, 256 const _Tp&, 257 _Tp&& 258>::type 259#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES 260const _Tp& 261#endif 262move_if_noexcept(_Tp& __x) _NOEXCEPT 263{ 264 return _VSTD::move(__x); 265} 266 267#if _LIBCPP_STD_VER > 14 268template <class _Tp> constexpr add_const_t<_Tp>& as_const(_Tp& __t) noexcept { return __t; } 269template <class _Tp> void as_const(const _Tp&&) = delete; 270#endif 271 272struct _LIBCPP_TYPE_VIS_ONLY piecewise_construct_t { }; 273#if defined(_LIBCPP_HAS_NO_CONSTEXPR) || defined(_LIBCPP_BUILDING_UTILITY) 274extern const piecewise_construct_t piecewise_construct;// = piecewise_construct_t(); 275#else 276constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t(); 277#endif 278 279template <class _T1, class _T2> 280struct _LIBCPP_TYPE_VIS_ONLY pair 281{ 282 typedef _T1 first_type; 283 typedef _T2 second_type; 284 285 _T1 first; 286 _T2 second; 287 288#ifndef _LIBCPP_HAS_NO_DEFAULT_FUNCTION_TEMPLATE_ARGS 289 template <bool _Dummy = true, class = typename enable_if< 290 __dependent_type<is_default_constructible<_T1>, _Dummy>::value && 291 __dependent_type<is_default_constructible<_T2>, _Dummy>::value 292 >::type> 293#endif 294 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR pair() : first(), second() {} 295 296 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 297 pair(const _T1& __x, const _T2& __y) 298 : first(__x), second(__y) {} 299 300 template<class _U1, class _U2> 301 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 302 pair(const pair<_U1, _U2>& __p 303#ifndef _LIBCPP_HAS_NO_ADVANCED_SFINAE 304 ,typename enable_if<is_convertible<const _U1&, _T1>::value && 305 is_convertible<const _U2&, _T2>::value>::type* = 0 306#endif 307 ) 308 : first(__p.first), second(__p.second) {} 309 310#if defined(_LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR) 311 _LIBCPP_INLINE_VISIBILITY 312 pair(const pair& __p) 313 _NOEXCEPT_(is_nothrow_copy_constructible<first_type>::value && 314 is_nothrow_copy_constructible<second_type>::value) 315 : first(__p.first), 316 second(__p.second) 317 { 318 } 319 320# ifndef _LIBCPP_CXX03_LANG 321 _LIBCPP_INLINE_VISIBILITY 322 pair(pair&& __p) _NOEXCEPT_(is_nothrow_move_constructible<first_type>::value && 323 is_nothrow_move_constructible<second_type>::value) 324 : first(_VSTD::forward<first_type>(__p.first)), 325 second(_VSTD::forward<second_type>(__p.second)) 326 { 327 } 328# endif 329#elif !defined(_LIBCPP_CXX03_LANG) 330 pair(pair const&) = default; 331 pair(pair&&) = default; 332#else 333 // Use the implicitly declared copy constructor in C++03 334#endif 335 336 _LIBCPP_INLINE_VISIBILITY 337 pair& operator=(const pair& __p) 338 _NOEXCEPT_(is_nothrow_copy_assignable<first_type>::value && 339 is_nothrow_copy_assignable<second_type>::value) 340 { 341 first = __p.first; 342 second = __p.second; 343 return *this; 344 } 345 346#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 347 348 template <class _U1, class _U2, 349 class = typename enable_if<is_convertible<_U1, first_type>::value && 350 is_convertible<_U2, second_type>::value>::type> 351 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 352 pair(_U1&& __u1, _U2&& __u2) 353 : first(_VSTD::forward<_U1>(__u1)), 354 second(_VSTD::forward<_U2>(__u2)) 355 {} 356 357 template<class _U1, class _U2> 358 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 359 pair(pair<_U1, _U2>&& __p, 360 typename enable_if<is_convertible<_U1, _T1>::value && 361 is_convertible<_U2, _T2>::value>::type* = 0) 362 : first(_VSTD::forward<_U1>(__p.first)), 363 second(_VSTD::forward<_U2>(__p.second)) {} 364 365 _LIBCPP_INLINE_VISIBILITY 366 pair& 367 operator=(pair&& __p) _NOEXCEPT_(is_nothrow_move_assignable<first_type>::value && 368 is_nothrow_move_assignable<second_type>::value) 369 { 370 first = _VSTD::forward<first_type>(__p.first); 371 second = _VSTD::forward<second_type>(__p.second); 372 return *this; 373 } 374 375#ifndef _LIBCPP_HAS_NO_VARIADICS 376 377 template<class _Tuple, 378 class = typename enable_if<__tuple_convertible<_Tuple, pair>::value>::type> 379 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 380 pair(_Tuple&& __p) 381 : first(_VSTD::forward<typename tuple_element<0, 382 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<0>(__p))), 383 second(_VSTD::forward<typename tuple_element<1, 384 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<1>(__p))) 385 {} 386 387 388 389 template <class... _Args1, class... _Args2> 390 _LIBCPP_INLINE_VISIBILITY 391 pair(piecewise_construct_t __pc, tuple<_Args1...> __first_args, 392 tuple<_Args2...> __second_args) 393 : pair(__pc, __first_args, __second_args, 394 typename __make_tuple_indices<sizeof...(_Args1)>::type(), 395 typename __make_tuple_indices<sizeof...(_Args2) >::type()) 396 {} 397 398 template <class _Tuple, 399 class = typename enable_if<__tuple_assignable<_Tuple, pair>::value>::type> 400 _LIBCPP_INLINE_VISIBILITY 401 pair& 402 operator=(_Tuple&& __p) 403 { 404 typedef typename __make_tuple_types<_Tuple>::type _TupleRef; 405 typedef typename tuple_element<0, _TupleRef>::type _U0; 406 typedef typename tuple_element<1, _TupleRef>::type _U1; 407 first = _VSTD::forward<_U0>(_VSTD::get<0>(__p)); 408 second = _VSTD::forward<_U1>(_VSTD::get<1>(__p)); 409 return *this; 410 } 411 412#endif // _LIBCPP_HAS_NO_VARIADICS 413 414#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 415 _LIBCPP_INLINE_VISIBILITY 416 void 417 swap(pair& __p) _NOEXCEPT_(__is_nothrow_swappable<first_type>::value && 418 __is_nothrow_swappable<second_type>::value) 419 { 420 using _VSTD::swap; 421 swap(first, __p.first); 422 swap(second, __p.second); 423 } 424private: 425 426#ifndef _LIBCPP_HAS_NO_VARIADICS 427 template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2> 428 _LIBCPP_INLINE_VISIBILITY 429 pair(piecewise_construct_t, 430 tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args, 431 __tuple_indices<_I1...>, __tuple_indices<_I2...>); 432#endif // _LIBCPP_HAS_NO_VARIADICS 433}; 434 435template <class _T1, class _T2> 436inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 437bool 438operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 439{ 440 return __x.first == __y.first && __x.second == __y.second; 441} 442 443template <class _T1, class _T2> 444inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 445bool 446operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 447{ 448 return !(__x == __y); 449} 450 451template <class _T1, class _T2> 452inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 453bool 454operator< (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 455{ 456 return __x.first < __y.first || (!(__y.first < __x.first) && __x.second < __y.second); 457} 458 459template <class _T1, class _T2> 460inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 461bool 462operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 463{ 464 return __y < __x; 465} 466 467template <class _T1, class _T2> 468inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 469bool 470operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 471{ 472 return !(__x < __y); 473} 474 475template <class _T1, class _T2> 476inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 477bool 478operator<=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 479{ 480 return !(__y < __x); 481} 482 483template <class _T1, class _T2> 484inline _LIBCPP_INLINE_VISIBILITY 485typename enable_if 486< 487 __is_swappable<_T1>::value && 488 __is_swappable<_T2>::value, 489 void 490>::type 491swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y) 492 _NOEXCEPT_((__is_nothrow_swappable<_T1>::value && 493 __is_nothrow_swappable<_T2>::value)) 494{ 495 __x.swap(__y); 496} 497 498#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 499 500 501template <class _Tp> 502struct __make_pair_return_impl 503{ 504 typedef _Tp type; 505}; 506 507template <class _Tp> 508struct __make_pair_return_impl<reference_wrapper<_Tp>> 509{ 510 typedef _Tp& type; 511}; 512 513template <class _Tp> 514struct __make_pair_return 515{ 516 typedef typename __make_pair_return_impl<typename decay<_Tp>::type>::type type; 517}; 518 519template <class _T1, class _T2> 520inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 521pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type> 522make_pair(_T1&& __t1, _T2&& __t2) 523{ 524 return pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type> 525 (_VSTD::forward<_T1>(__t1), _VSTD::forward<_T2>(__t2)); 526} 527 528#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES 529 530template <class _T1, class _T2> 531inline _LIBCPP_INLINE_VISIBILITY 532pair<_T1,_T2> 533make_pair(_T1 __x, _T2 __y) 534{ 535 return pair<_T1, _T2>(__x, __y); 536} 537 538#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 539 540template <class _T1, class _T2> 541 class _LIBCPP_TYPE_VIS_ONLY tuple_size<pair<_T1, _T2> > 542 : public integral_constant<size_t, 2> {}; 543 544template <class _T1, class _T2> 545class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, pair<_T1, _T2> > 546{ 547public: 548 typedef _T1 type; 549}; 550 551template <class _T1, class _T2> 552class _LIBCPP_TYPE_VIS_ONLY tuple_element<1, pair<_T1, _T2> > 553{ 554public: 555 typedef _T2 type; 556}; 557 558template <size_t _Ip> struct __get_pair; 559 560template <> 561struct __get_pair<0> 562{ 563 template <class _T1, class _T2> 564 static 565 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 566 _T1& 567 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;} 568 569 template <class _T1, class _T2> 570 static 571 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 572 const _T1& 573 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;} 574 575#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 576 577 template <class _T1, class _T2> 578 static 579 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 580 _T1&& 581 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T1>(__p.first);} 582 583 template <class _T1, class _T2> 584 static 585 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 586 const _T1&& 587 get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<const _T1>(__p.first);} 588 589#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 590}; 591 592template <> 593struct __get_pair<1> 594{ 595 template <class _T1, class _T2> 596 static 597 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 598 _T2& 599 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;} 600 601 template <class _T1, class _T2> 602 static 603 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 604 const _T2& 605 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;} 606 607#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 608 609 template <class _T1, class _T2> 610 static 611 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 612 _T2&& 613 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T2>(__p.second);} 614 615 template <class _T1, class _T2> 616 static 617 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 618 const _T2&& 619 get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<const _T2>(__p.second);} 620 621#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 622}; 623 624template <size_t _Ip, class _T1, class _T2> 625inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 626typename tuple_element<_Ip, pair<_T1, _T2> >::type& 627get(pair<_T1, _T2>& __p) _NOEXCEPT 628{ 629 return __get_pair<_Ip>::get(__p); 630} 631 632template <size_t _Ip, class _T1, class _T2> 633inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 634const typename tuple_element<_Ip, pair<_T1, _T2> >::type& 635get(const pair<_T1, _T2>& __p) _NOEXCEPT 636{ 637 return __get_pair<_Ip>::get(__p); 638} 639 640#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 641 642template <size_t _Ip, class _T1, class _T2> 643inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 644typename tuple_element<_Ip, pair<_T1, _T2> >::type&& 645get(pair<_T1, _T2>&& __p) _NOEXCEPT 646{ 647 return __get_pair<_Ip>::get(_VSTD::move(__p)); 648} 649 650template <size_t _Ip, class _T1, class _T2> 651inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 652const typename tuple_element<_Ip, pair<_T1, _T2> >::type&& 653get(const pair<_T1, _T2>&& __p) _NOEXCEPT 654{ 655 return __get_pair<_Ip>::get(_VSTD::move(__p)); 656} 657 658#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 659 660#if _LIBCPP_STD_VER > 11 661template <class _T1, class _T2> 662inline _LIBCPP_INLINE_VISIBILITY 663constexpr _T1 & get(pair<_T1, _T2>& __p) _NOEXCEPT 664{ 665 return __get_pair<0>::get(__p); 666} 667 668template <class _T1, class _T2> 669inline _LIBCPP_INLINE_VISIBILITY 670constexpr _T1 const & get(pair<_T1, _T2> const& __p) _NOEXCEPT 671{ 672 return __get_pair<0>::get(__p); 673} 674 675template <class _T1, class _T2> 676inline _LIBCPP_INLINE_VISIBILITY 677constexpr _T1 && get(pair<_T1, _T2>&& __p) _NOEXCEPT 678{ 679 return __get_pair<0>::get(_VSTD::move(__p)); 680} 681 682template <class _T1, class _T2> 683inline _LIBCPP_INLINE_VISIBILITY 684constexpr _T1 const && get(pair<_T1, _T2> const&& __p) _NOEXCEPT 685{ 686 return __get_pair<0>::get(_VSTD::move(__p)); 687} 688 689template <class _T1, class _T2> 690inline _LIBCPP_INLINE_VISIBILITY 691constexpr _T1 & get(pair<_T2, _T1>& __p) _NOEXCEPT 692{ 693 return __get_pair<1>::get(__p); 694} 695 696template <class _T1, class _T2> 697inline _LIBCPP_INLINE_VISIBILITY 698constexpr _T1 const & get(pair<_T2, _T1> const& __p) _NOEXCEPT 699{ 700 return __get_pair<1>::get(__p); 701} 702 703template <class _T1, class _T2> 704inline _LIBCPP_INLINE_VISIBILITY 705constexpr _T1 && get(pair<_T2, _T1>&& __p) _NOEXCEPT 706{ 707 return __get_pair<1>::get(_VSTD::move(__p)); 708} 709 710template <class _T1, class _T2> 711inline _LIBCPP_INLINE_VISIBILITY 712constexpr _T1 const && get(pair<_T2, _T1> const&& __p) _NOEXCEPT 713{ 714 return __get_pair<1>::get(_VSTD::move(__p)); 715} 716 717#endif 718 719#if _LIBCPP_STD_VER > 11 720 721template<class _Tp, _Tp... _Ip> 722struct _LIBCPP_TYPE_VIS_ONLY integer_sequence 723{ 724 typedef _Tp value_type; 725 static_assert( is_integral<_Tp>::value, 726 "std::integer_sequence can only be instantiated with an integral type" ); 727 static 728 _LIBCPP_INLINE_VISIBILITY 729 constexpr 730 size_t 731 size() noexcept { return sizeof...(_Ip); } 732}; 733 734template<size_t... _Ip> 735 using index_sequence = integer_sequence<size_t, _Ip...>; 736 737#if __has_builtin(__make_integer_seq) && !defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE) 738 739template <class _Tp, _Tp _Ep> 740using __make_integer_sequence = __make_integer_seq<integer_sequence, _Tp, _Ep>; 741 742#else 743 744template<typename _Tp, _Tp _Np> using __make_integer_sequence_unchecked = 745 typename __detail::__make<_Np>::type::template __convert<integer_sequence, _Tp>; 746 747template <class _Tp, _Tp _Ep> 748struct __make_integer_sequence_checked 749{ 750 static_assert(is_integral<_Tp>::value, 751 "std::make_integer_sequence can only be instantiated with an integral type" ); 752 static_assert(0 <= _Ep, "std::make_integer_sequence must have a non-negative sequence length"); 753 // Workaround GCC bug by preventing bad installations when 0 <= _Ep 754 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68929 755 typedef __make_integer_sequence_unchecked<_Tp, 0 <= _Ep ? _Ep : 0> type; 756}; 757 758template <class _Tp, _Tp _Ep> 759using __make_integer_sequence = typename __make_integer_sequence_checked<_Tp, _Ep>::type; 760 761#endif 762 763template<class _Tp, _Tp _Np> 764 using make_integer_sequence = __make_integer_sequence<_Tp, _Np>; 765 766template<size_t _Np> 767 using make_index_sequence = make_integer_sequence<size_t, _Np>; 768 769template<class... _Tp> 770 using index_sequence_for = make_index_sequence<sizeof...(_Tp)>; 771 772#endif // _LIBCPP_STD_VER > 11 773 774#if _LIBCPP_STD_VER > 11 775template<class _T1, class _T2 = _T1> 776inline _LIBCPP_INLINE_VISIBILITY 777_T1 exchange(_T1& __obj, _T2 && __new_value) 778{ 779 _T1 __old_value = _VSTD::move(__obj); 780 __obj = _VSTD::forward<_T2>(__new_value); 781 return __old_value; 782} 783#endif // _LIBCPP_STD_VER > 11 784 785_LIBCPP_END_NAMESPACE_STD 786 787#endif // _LIBCPP_UTILITY 788