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); 174 175// 20.2.7, in-place construction // C++17 176struct in_place_t { 177 explicit in_place_t() = default; 178}; 179inline constexpr in_place_t in_place{}; 180template <class T> 181 struct in_place_type_t { 182 explicit in_place_type_t() = default; 183 }; 184template <class T> 185 inline constexpr in_place_type_t<T> in_place_type{}; 186template <size_t I> 187 struct in_place_index_t { 188 explicit in_place_index_t() = default; 189 }; 190template <size_t I> 191 inline constexpr in_place_index_t<I> in_place_index{}; 192 193} // std 194 195*/ 196 197#include <__config> 198#include <__tuple> 199#include <type_traits> 200#include <initializer_list> 201#include <__debug> 202 203#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 204#pragma GCC system_header 205#endif 206 207_LIBCPP_BEGIN_NAMESPACE_STD 208 209namespace rel_ops 210{ 211 212template<class _Tp> 213inline _LIBCPP_INLINE_VISIBILITY 214bool 215operator!=(const _Tp& __x, const _Tp& __y) 216{ 217 return !(__x == __y); 218} 219 220template<class _Tp> 221inline _LIBCPP_INLINE_VISIBILITY 222bool 223operator> (const _Tp& __x, const _Tp& __y) 224{ 225 return __y < __x; 226} 227 228template<class _Tp> 229inline _LIBCPP_INLINE_VISIBILITY 230bool 231operator<=(const _Tp& __x, const _Tp& __y) 232{ 233 return !(__y < __x); 234} 235 236template<class _Tp> 237inline _LIBCPP_INLINE_VISIBILITY 238bool 239operator>=(const _Tp& __x, const _Tp& __y) 240{ 241 return !(__x < __y); 242} 243 244} // rel_ops 245 246// swap_ranges 247 248 249template <class _ForwardIterator1, class _ForwardIterator2> 250inline _LIBCPP_INLINE_VISIBILITY 251_ForwardIterator2 252swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2) 253{ 254 for(; __first1 != __last1; ++__first1, (void) ++__first2) 255 swap(*__first1, *__first2); 256 return __first2; 257} 258 259// forward declared in <type_traits> 260template<class _Tp, size_t _Np> 261inline _LIBCPP_INLINE_VISIBILITY 262typename enable_if< 263 __is_swappable<_Tp>::value 264>::type 265swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value) 266{ 267 _VSTD::swap_ranges(__a, __a + _Np, __b); 268} 269 270template <class _Tp> 271inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 272#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 273typename conditional 274< 275 !is_nothrow_move_constructible<_Tp>::value && is_copy_constructible<_Tp>::value, 276 const _Tp&, 277 _Tp&& 278>::type 279#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES 280const _Tp& 281#endif 282move_if_noexcept(_Tp& __x) _NOEXCEPT 283{ 284 return _VSTD::move(__x); 285} 286 287#if _LIBCPP_STD_VER > 14 288template <class _Tp> constexpr add_const_t<_Tp>& as_const(_Tp& __t) noexcept { return __t; } 289template <class _Tp> void as_const(const _Tp&&) = delete; 290#endif 291 292struct _LIBCPP_TEMPLATE_VIS piecewise_construct_t { }; 293#if defined(_LIBCPP_HAS_NO_CONSTEXPR) || defined(_LIBCPP_BUILDING_UTILITY) 294extern const piecewise_construct_t piecewise_construct;// = piecewise_construct_t(); 295#else 296constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t(); 297#endif 298 299#if defined(_LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR) 300struct __non_trivially_copyable_base { 301 _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY 302 __non_trivially_copyable_base() _NOEXCEPT {} 303 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 304 __non_trivially_copyable_base(__non_trivially_copyable_base const&) _NOEXCEPT {} 305}; 306#endif 307 308template <class _T1, class _T2> 309struct _LIBCPP_TEMPLATE_VIS pair 310#if defined(_LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR) 311: private __non_trivially_copyable_base 312#endif 313{ 314 typedef _T1 first_type; 315 typedef _T2 second_type; 316 317 _T1 first; 318 _T2 second; 319 320#if !defined(_LIBCPP_CXX03_LANG) 321 pair(pair const&) = default; 322 pair(pair&&) = default; 323#else 324 // Use the implicitly declared copy constructor in C++03 325#endif 326 327#ifdef _LIBCPP_CXX03_LANG 328 _LIBCPP_INLINE_VISIBILITY 329 pair() : first(), second() {} 330 331 _LIBCPP_INLINE_VISIBILITY 332 pair(_T1 const& __t1, _T2 const& __t2) : first(__t1), second(__t2) {} 333 334 template <class _U1, class _U2> 335 _LIBCPP_INLINE_VISIBILITY 336 pair(const pair<_U1, _U2>& __p) : first(__p.first), second(__p.second) {} 337 338 _LIBCPP_INLINE_VISIBILITY 339 pair& operator=(pair const& __p) { 340 first = __p.first; 341 second = __p.second; 342 return *this; 343 } 344#else 345 template <bool _Val> 346 using _EnableB = typename enable_if<_Val, bool>::type; 347 348 struct _CheckArgs { 349 template <class _U1, class _U2> 350 static constexpr bool __enable_default() { 351 return is_default_constructible<_U1>::value 352 && is_default_constructible<_U2>::value; 353 } 354 355 template <class _U1, class _U2> 356 static constexpr bool __enable_explicit() { 357 return is_constructible<first_type, _U1>::value 358 && is_constructible<second_type, _U2>::value 359 && (!is_convertible<_U1, first_type>::value 360 || !is_convertible<_U2, second_type>::value); 361 } 362 363 template <class _U1, class _U2> 364 static constexpr bool __enable_implicit() { 365 return is_constructible<first_type, _U1>::value 366 && is_constructible<second_type, _U2>::value 367 && is_convertible<_U1, first_type>::value 368 && is_convertible<_U2, second_type>::value; 369 } 370 }; 371 372 template <bool _MaybeEnable> 373 using _CheckArgsDep = typename conditional< 374 _MaybeEnable, _CheckArgs, __check_tuple_constructor_fail>::type; 375 376 struct _CheckTupleLikeConstructor { 377 template <class _Tuple> 378 static constexpr bool __enable_implicit() { 379 return __tuple_convertible<_Tuple, pair>::value; 380 } 381 382 template <class _Tuple> 383 static constexpr bool __enable_explicit() { 384 return __tuple_constructible<_Tuple, pair>::value 385 && !__tuple_convertible<_Tuple, pair>::value; 386 } 387 388 template <class _Tuple> 389 static constexpr bool __enable_assign() { 390 return __tuple_assignable<_Tuple, pair>::value; 391 } 392 }; 393 394 template <class _Tuple> 395 using _CheckTLC = typename conditional< 396 __tuple_like_with_size<_Tuple, 2>::value 397 && !is_same<typename decay<_Tuple>::type, pair>::value, 398 _CheckTupleLikeConstructor, 399 __check_tuple_constructor_fail 400 >::type; 401 402 template<bool _Dummy = true, _EnableB< 403 _CheckArgsDep<_Dummy>::template __enable_default<_T1, _T2>() 404 > = false> 405 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 406 pair() : first(), second() {} 407 408 template <bool _Dummy = true, _EnableB< 409 _CheckArgsDep<_Dummy>::template __enable_explicit<_T1 const&, _T2 const&>() 410 > = false> 411 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 412 explicit pair(_T1 const& __t1, _T2 const& __t2) 413 : first(__t1), second(__t2) {} 414 415 template<bool _Dummy = true, _EnableB< 416 _CheckArgsDep<_Dummy>::template __enable_implicit<_T1 const&, _T2 const&>() 417 > = false> 418 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 419 pair(_T1 const& __t1, _T2 const& __t2) 420 : first(__t1), second(__t2) {} 421 422 template<class _U1, class _U2, _EnableB< 423 _CheckArgs::template __enable_explicit<_U1, _U2>() 424 > = false> 425 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 426 explicit pair(_U1&& __u1, _U2&& __u2) 427 : first(_VSTD::forward<_U1>(__u1)), second(_VSTD::forward<_U2>(__u2)) {} 428 429 template<class _U1, class _U2, _EnableB< 430 _CheckArgs::template __enable_implicit<_U1, _U2>() 431 > = false> 432 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 433 pair(_U1&& __u1, _U2&& __u2) 434 : first(_VSTD::forward<_U1>(__u1)), second(_VSTD::forward<_U2>(__u2)) {} 435 436 template<class _U1, class _U2, _EnableB< 437 _CheckArgs::template __enable_explicit<_U1 const&, _U2 const&>() 438 > = false> 439 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 440 explicit pair(pair<_U1, _U2> const& __p) 441 : first(__p.first), second(__p.second) {} 442 443 template<class _U1, class _U2, _EnableB< 444 _CheckArgs::template __enable_implicit<_U1 const&, _U2 const&>() 445 > = false> 446 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 447 pair(pair<_U1, _U2> const& __p) 448 : first(__p.first), second(__p.second) {} 449 450 template<class _U1, class _U2, _EnableB< 451 _CheckArgs::template __enable_explicit<_U1, _U2>() 452 > = false> 453 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 454 explicit pair(pair<_U1, _U2>&&__p) 455 : first(_VSTD::forward<_U1>(__p.first)), second(_VSTD::forward<_U2>(__p.second)) {} 456 457 template<class _U1, class _U2, _EnableB< 458 _CheckArgs::template __enable_implicit<_U1, _U2>() 459 > = false> 460 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 461 pair(pair<_U1, _U2>&& __p) 462 : first(_VSTD::forward<_U1>(__p.first)), second(_VSTD::forward<_U2>(__p.second)) {} 463 464 template<class _Tuple, _EnableB< 465 _CheckTLC<_Tuple>::template __enable_explicit<_Tuple>() 466 > = false> 467 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 468 explicit pair(_Tuple&& __p) 469 : first(_VSTD::get<0>(_VSTD::forward<_Tuple>(__p))), 470 second(_VSTD::get<1>(_VSTD::forward<_Tuple>(__p))) {} 471 472 template<class _Tuple, _EnableB< 473 _CheckTLC<_Tuple>::template __enable_implicit<_Tuple>() 474 > = false> 475 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 476 pair(_Tuple&& __p) 477 : first(_VSTD::get<0>(_VSTD::forward<_Tuple>(__p))), 478 second(_VSTD::get<1>(_VSTD::forward<_Tuple>(__p))) {} 479 480 template <class... _Args1, class... _Args2> 481 _LIBCPP_INLINE_VISIBILITY 482 pair(piecewise_construct_t __pc, 483 tuple<_Args1...> __first_args, tuple<_Args2...> __second_args) 484 : pair(__pc, __first_args, __second_args, 485 typename __make_tuple_indices<sizeof...(_Args1)>::type(), 486 typename __make_tuple_indices<sizeof...(_Args2) >::type()) {} 487 488 _LIBCPP_INLINE_VISIBILITY 489 pair& operator=(typename conditional< 490 is_copy_assignable<first_type>::value && 491 is_copy_assignable<second_type>::value, 492 pair, __nat>::type const& __p) 493 _NOEXCEPT_(is_nothrow_copy_assignable<first_type>::value && 494 is_nothrow_copy_assignable<second_type>::value) 495 { 496 first = __p.first; 497 second = __p.second; 498 return *this; 499 } 500 501 _LIBCPP_INLINE_VISIBILITY 502 pair& operator=(typename conditional< 503 is_move_assignable<first_type>::value && 504 is_move_assignable<second_type>::value, 505 pair, __nat>::type&& __p) 506 _NOEXCEPT_(is_nothrow_move_assignable<first_type>::value && 507 is_nothrow_move_assignable<second_type>::value) 508 { 509 first = _VSTD::forward<first_type>(__p.first); 510 second = _VSTD::forward<second_type>(__p.second); 511 return *this; 512 } 513 514 template <class _Tuple, _EnableB< 515 _CheckTLC<_Tuple>::template __enable_assign<_Tuple>() 516 > = false> 517 _LIBCPP_INLINE_VISIBILITY 518 pair& operator=(_Tuple&& __p) { 519 first = _VSTD::get<0>(_VSTD::forward<_Tuple>(__p)); 520 second = _VSTD::get<1>(_VSTD::forward<_Tuple>(__p)); 521 return *this; 522 } 523#endif 524 525 _LIBCPP_INLINE_VISIBILITY 526 void 527 swap(pair& __p) _NOEXCEPT_(__is_nothrow_swappable<first_type>::value && 528 __is_nothrow_swappable<second_type>::value) 529 { 530 using _VSTD::swap; 531 swap(first, __p.first); 532 swap(second, __p.second); 533 } 534private: 535 536#ifndef _LIBCPP_CXX03_LANG 537 template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2> 538 _LIBCPP_INLINE_VISIBILITY 539 pair(piecewise_construct_t, 540 tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args, 541 __tuple_indices<_I1...>, __tuple_indices<_I2...>); 542#endif 543}; 544 545template <class _T1, class _T2> 546inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 547bool 548operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 549{ 550 return __x.first == __y.first && __x.second == __y.second; 551} 552 553template <class _T1, class _T2> 554inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 555bool 556operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 557{ 558 return !(__x == __y); 559} 560 561template <class _T1, class _T2> 562inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 563bool 564operator< (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 565{ 566 return __x.first < __y.first || (!(__y.first < __x.first) && __x.second < __y.second); 567} 568 569template <class _T1, class _T2> 570inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 571bool 572operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 573{ 574 return __y < __x; 575} 576 577template <class _T1, class _T2> 578inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 579bool 580operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 581{ 582 return !(__x < __y); 583} 584 585template <class _T1, class _T2> 586inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 587bool 588operator<=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 589{ 590 return !(__y < __x); 591} 592 593template <class _T1, class _T2> 594inline _LIBCPP_INLINE_VISIBILITY 595typename enable_if 596< 597 __is_swappable<_T1>::value && 598 __is_swappable<_T2>::value, 599 void 600>::type 601swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y) 602 _NOEXCEPT_((__is_nothrow_swappable<_T1>::value && 603 __is_nothrow_swappable<_T2>::value)) 604{ 605 __x.swap(__y); 606} 607 608#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 609 610 611template <class _Tp> 612struct __make_pair_return_impl 613{ 614 typedef _Tp type; 615}; 616 617template <class _Tp> 618struct __make_pair_return_impl<reference_wrapper<_Tp>> 619{ 620 typedef _Tp& type; 621}; 622 623template <class _Tp> 624struct __make_pair_return 625{ 626 typedef typename __make_pair_return_impl<typename decay<_Tp>::type>::type type; 627}; 628 629template <class _T1, class _T2> 630inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 631pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type> 632make_pair(_T1&& __t1, _T2&& __t2) 633{ 634 return pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type> 635 (_VSTD::forward<_T1>(__t1), _VSTD::forward<_T2>(__t2)); 636} 637 638#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES 639 640template <class _T1, class _T2> 641inline _LIBCPP_INLINE_VISIBILITY 642pair<_T1,_T2> 643make_pair(_T1 __x, _T2 __y) 644{ 645 return pair<_T1, _T2>(__x, __y); 646} 647 648#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 649 650template <class _T1, class _T2> 651 class _LIBCPP_TEMPLATE_VIS tuple_size<pair<_T1, _T2> > 652 : public integral_constant<size_t, 2> {}; 653 654template <class _T1, class _T2> 655class _LIBCPP_TEMPLATE_VIS tuple_element<0, pair<_T1, _T2> > 656{ 657public: 658 typedef _T1 type; 659}; 660 661template <class _T1, class _T2> 662class _LIBCPP_TEMPLATE_VIS tuple_element<1, pair<_T1, _T2> > 663{ 664public: 665 typedef _T2 type; 666}; 667 668template <size_t _Ip> struct __get_pair; 669 670template <> 671struct __get_pair<0> 672{ 673 template <class _T1, class _T2> 674 static 675 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 676 _T1& 677 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;} 678 679 template <class _T1, class _T2> 680 static 681 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 682 const _T1& 683 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;} 684 685#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 686 687 template <class _T1, class _T2> 688 static 689 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 690 _T1&& 691 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T1>(__p.first);} 692 693 template <class _T1, class _T2> 694 static 695 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 696 const _T1&& 697 get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<const _T1>(__p.first);} 698 699#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 700}; 701 702template <> 703struct __get_pair<1> 704{ 705 template <class _T1, class _T2> 706 static 707 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 708 _T2& 709 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;} 710 711 template <class _T1, class _T2> 712 static 713 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 714 const _T2& 715 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;} 716 717#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 718 719 template <class _T1, class _T2> 720 static 721 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 722 _T2&& 723 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T2>(__p.second);} 724 725 template <class _T1, class _T2> 726 static 727 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 728 const _T2&& 729 get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<const _T2>(__p.second);} 730 731#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 732}; 733 734template <size_t _Ip, class _T1, class _T2> 735inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 736typename tuple_element<_Ip, pair<_T1, _T2> >::type& 737get(pair<_T1, _T2>& __p) _NOEXCEPT 738{ 739 return __get_pair<_Ip>::get(__p); 740} 741 742template <size_t _Ip, class _T1, class _T2> 743inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 744const typename tuple_element<_Ip, pair<_T1, _T2> >::type& 745get(const pair<_T1, _T2>& __p) _NOEXCEPT 746{ 747 return __get_pair<_Ip>::get(__p); 748} 749 750#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 751 752template <size_t _Ip, class _T1, class _T2> 753inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 754typename tuple_element<_Ip, pair<_T1, _T2> >::type&& 755get(pair<_T1, _T2>&& __p) _NOEXCEPT 756{ 757 return __get_pair<_Ip>::get(_VSTD::move(__p)); 758} 759 760template <size_t _Ip, class _T1, class _T2> 761inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 762const typename tuple_element<_Ip, pair<_T1, _T2> >::type&& 763get(const pair<_T1, _T2>&& __p) _NOEXCEPT 764{ 765 return __get_pair<_Ip>::get(_VSTD::move(__p)); 766} 767 768#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 769 770#if _LIBCPP_STD_VER > 11 771template <class _T1, class _T2> 772inline _LIBCPP_INLINE_VISIBILITY 773constexpr _T1 & get(pair<_T1, _T2>& __p) _NOEXCEPT 774{ 775 return __get_pair<0>::get(__p); 776} 777 778template <class _T1, class _T2> 779inline _LIBCPP_INLINE_VISIBILITY 780constexpr _T1 const & get(pair<_T1, _T2> const& __p) _NOEXCEPT 781{ 782 return __get_pair<0>::get(__p); 783} 784 785template <class _T1, class _T2> 786inline _LIBCPP_INLINE_VISIBILITY 787constexpr _T1 && get(pair<_T1, _T2>&& __p) _NOEXCEPT 788{ 789 return __get_pair<0>::get(_VSTD::move(__p)); 790} 791 792template <class _T1, class _T2> 793inline _LIBCPP_INLINE_VISIBILITY 794constexpr _T1 const && get(pair<_T1, _T2> const&& __p) _NOEXCEPT 795{ 796 return __get_pair<0>::get(_VSTD::move(__p)); 797} 798 799template <class _T1, class _T2> 800inline _LIBCPP_INLINE_VISIBILITY 801constexpr _T1 & get(pair<_T2, _T1>& __p) _NOEXCEPT 802{ 803 return __get_pair<1>::get(__p); 804} 805 806template <class _T1, class _T2> 807inline _LIBCPP_INLINE_VISIBILITY 808constexpr _T1 const & get(pair<_T2, _T1> const& __p) _NOEXCEPT 809{ 810 return __get_pair<1>::get(__p); 811} 812 813template <class _T1, class _T2> 814inline _LIBCPP_INLINE_VISIBILITY 815constexpr _T1 && get(pair<_T2, _T1>&& __p) _NOEXCEPT 816{ 817 return __get_pair<1>::get(_VSTD::move(__p)); 818} 819 820template <class _T1, class _T2> 821inline _LIBCPP_INLINE_VISIBILITY 822constexpr _T1 const && get(pair<_T2, _T1> const&& __p) _NOEXCEPT 823{ 824 return __get_pair<1>::get(_VSTD::move(__p)); 825} 826 827#endif 828 829#if _LIBCPP_STD_VER > 11 830 831template<class _Tp, _Tp... _Ip> 832struct _LIBCPP_TEMPLATE_VIS integer_sequence 833{ 834 typedef _Tp value_type; 835 static_assert( is_integral<_Tp>::value, 836 "std::integer_sequence can only be instantiated with an integral type" ); 837 static 838 _LIBCPP_INLINE_VISIBILITY 839 constexpr 840 size_t 841 size() noexcept { return sizeof...(_Ip); } 842}; 843 844template<size_t... _Ip> 845 using index_sequence = integer_sequence<size_t, _Ip...>; 846 847#if __has_builtin(__make_integer_seq) && !defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE) 848 849template <class _Tp, _Tp _Ep> 850using __make_integer_sequence = __make_integer_seq<integer_sequence, _Tp, _Ep>; 851 852#else 853 854template<typename _Tp, _Tp _Np> using __make_integer_sequence_unchecked = 855 typename __detail::__make<_Np>::type::template __convert<integer_sequence, _Tp>; 856 857template <class _Tp, _Tp _Ep> 858struct __make_integer_sequence_checked 859{ 860 static_assert(is_integral<_Tp>::value, 861 "std::make_integer_sequence can only be instantiated with an integral type" ); 862 static_assert(0 <= _Ep, "std::make_integer_sequence must have a non-negative sequence length"); 863 // Workaround GCC bug by preventing bad installations when 0 <= _Ep 864 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68929 865 typedef __make_integer_sequence_unchecked<_Tp, 0 <= _Ep ? _Ep : 0> type; 866}; 867 868template <class _Tp, _Tp _Ep> 869using __make_integer_sequence = typename __make_integer_sequence_checked<_Tp, _Ep>::type; 870 871#endif 872 873template<class _Tp, _Tp _Np> 874 using make_integer_sequence = __make_integer_sequence<_Tp, _Np>; 875 876template<size_t _Np> 877 using make_index_sequence = make_integer_sequence<size_t, _Np>; 878 879template<class... _Tp> 880 using index_sequence_for = make_index_sequence<sizeof...(_Tp)>; 881 882#endif // _LIBCPP_STD_VER > 11 883 884#if _LIBCPP_STD_VER > 11 885template<class _T1, class _T2 = _T1> 886inline _LIBCPP_INLINE_VISIBILITY 887_T1 exchange(_T1& __obj, _T2 && __new_value) 888{ 889 _T1 __old_value = _VSTD::move(__obj); 890 __obj = _VSTD::forward<_T2>(__new_value); 891 return __old_value; 892} 893#endif // _LIBCPP_STD_VER > 11 894 895#if _LIBCPP_STD_VER > 14 896 897struct _LIBCPP_TYPE_VIS in_place_t { 898 explicit in_place_t() = default; 899}; 900#ifndef _LIBCPP_HAS_NO_INLINE_VARIABLES 901inline 902#endif 903constexpr in_place_t in_place{}; 904 905template <class _Tp> 906struct _LIBCPP_TYPE_VIS in_place_type_t { 907 explicit in_place_type_t() = default; 908}; 909template <class _Tp> 910#ifndef _LIBCPP_HAS_NO_INLINE_VARIABLES 911inline 912#endif 913constexpr in_place_type_t<_Tp> in_place_type{}; 914 915template <size_t _Idx> 916struct _LIBCPP_TYPE_VIS in_place_index_t { 917 explicit in_place_index_t() = default; 918}; 919template <size_t _Idx> 920#ifndef _LIBCPP_HAS_NO_INLINE_VARIABLES 921inline 922#endif 923constexpr in_place_index_t<_Idx> in_place_index{}; 924 925template <class _Tp> struct __is_inplace_type_imp : false_type {}; 926template <class _Tp> struct __is_inplace_type_imp<in_place_type_t<_Tp>> : true_type {}; 927 928template <class _Tp> 929using __is_inplace_type = __is_inplace_type_imp<__uncvref_t<_Tp>>; 930 931#endif // _LIBCPP_STD_VER > 14 932 933_LIBCPP_END_NAMESPACE_STD 934 935#endif // _LIBCPP_UTILITY 936