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