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 17 namespace std 18 { 19 20 template <class T> 21 void 22 swap(T& a, T& b); 23 24 namespace 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 32 template<class T> 33 void 34 swap(T& a, T& b) noexcept(is_nothrow_move_constructible<T>::value && 35 is_nothrow_move_assignable<T>::value); 36 37 template <class T, size_t N> 38 void 39 swap(T (&a)[N], T (&b)[N]) noexcept(noexcept(swap(*a, *b))); 40 41 template <class T> T&& forward(typename remove_reference<T>::type& t) noexcept; // constexpr in C++14 42 template <class T> T&& forward(typename remove_reference<T>::type&& t) noexcept; // constexpr in C++14 43 44 template <class T> typename remove_reference<T>::type&& move(T&&) noexcept; // constexpr in C++14 45 46 template <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 55 template <class T> constexpr add_const<T>_t& as_const(T& t) noexcept; // C++17 56 template <class T> void as_const(const T&&) = delete; // C++17 57 58 template <class T> typename add_rvalue_reference<T>::type declval() noexcept; 59 60 template <class T1, class T2> 61 struct 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 89 template <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 90 template <class T1, class T2> bool operator!=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 91 template <class T1, class T2> bool operator< (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 92 template <class T1, class T2> bool operator> (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 93 template <class T1, class T2> bool operator>=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 94 template <class T1, class T2> bool operator<=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 95 96 template <class T1, class T2> pair<V1, V2> make_pair(T1&&, T2&&); // constexpr in C++14 97 template <class T1, class T2> 98 void 99 swap(pair<T1, T2>& x, pair<T1, T2>& y) noexcept(noexcept(x.swap(y))); 100 101 struct piecewise_construct_t { }; 102 constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t(); 103 104 template <class T> class tuple_size; 105 template <size_t I, class T> class tuple_element; 106 107 template <class T1, class T2> struct tuple_size<pair<T1, T2> >; 108 template <class T1, class T2> struct tuple_element<0, pair<T1, T2> >; 109 template <class T1, class T2> struct tuple_element<1, pair<T1, T2> >; 110 111 template<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++14 114 115 template<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++14 118 119 template<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++14 122 123 template<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++14 126 127 template<class T1, class T2> 128 constexpr T1& get(pair<T1, T2>&) noexcept; // C++14 129 130 template<class T1, class T2> 131 constexpr const T1& get(const pair<T1, T2>&) noexcept; // C++14 132 133 template<class T1, class T2> 134 constexpr T1&& get(pair<T1, T2>&&) noexcept; // C++14 135 136 template<class T1, class T2> 137 constexpr const T1&& get(const pair<T1, T2>&&) noexcept; // C++14 138 139 template<class T1, class T2> 140 constexpr T1& get(pair<T2, T1>&) noexcept; // C++14 141 142 template<class T1, class T2> 143 constexpr const T1& get(const pair<T2, T1>&) noexcept; // C++14 144 145 template<class T1, class T2> 146 constexpr T1&& get(pair<T2, T1>&&) noexcept; // C++14 147 148 template<class T1, class T2> 149 constexpr const T1&& get(const pair<T2, T1>&&) noexcept; // C++14 150 151 // C++14 152 153 template<class T, T... I> 154 struct integer_sequence 155 { 156 typedef T value_type; 157 158 static constexpr size_t size() noexcept; 159 }; 160 161 template<size_t... I> 162 using index_sequence = integer_sequence<size_t, I...>; 163 164 template<class T, T N> 165 using make_integer_sequence = integer_sequence<T, 0, 1, ..., N-1>; 166 template<size_t N> 167 using make_index_sequence = make_integer_sequence<size_t, N>; 168 169 template<class... T> 170 using index_sequence_for = make_index_sequence<sizeof...(T)>; 171 172 template<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 188 189 namespace rel_ops 190 { 191 192 template<class _Tp> 193 inline _LIBCPP_INLINE_VISIBILITY 194 bool 195 operator!=(const _Tp& __x, const _Tp& __y) 196 { 197 return !(__x == __y); 198 } 199 200 template<class _Tp> 201 inline _LIBCPP_INLINE_VISIBILITY 202 bool 203 operator> (const _Tp& __x, const _Tp& __y) 204 { 205 return __y < __x; 206 } 207 208 template<class _Tp> 209 inline _LIBCPP_INLINE_VISIBILITY 210 bool 211 operator<=(const _Tp& __x, const _Tp& __y) 212 { 213 return !(__y < __x); 214 } 215 216 template<class _Tp> 217 inline _LIBCPP_INLINE_VISIBILITY 218 bool 219 operator>=(const _Tp& __x, const _Tp& __y) 220 { 221 return !(__x < __y); 222 } 223 224 } // rel_ops 225 226 // swap_ranges 227 228 229 template <class _ForwardIterator1, class _ForwardIterator2> 230 inline _LIBCPP_INLINE_VISIBILITY 231 _ForwardIterator2 232 swap_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> 240 template<class _Tp, size_t _Np> 241 inline _LIBCPP_INLINE_VISIBILITY 242 typename enable_if< 243 __is_swappable<_Tp>::value 244 >::type 245 swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value) 246 { 247 _VSTD::swap_ranges(__a, __a + _Np, __b); 248 } 249 250 template <class _Tp> 251 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 252 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 253 typename 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 260 const _Tp& 261 #endif 262 move_if_noexcept(_Tp& __x) _NOEXCEPT 263 { 264 return _VSTD::move(__x); 265 } 266 267 #if _LIBCPP_STD_VER > 14 268 template <class _Tp> constexpr add_const_t<_Tp>& as_const(_Tp& __t) noexcept { return __t; } 269 template <class _Tp> void as_const(const _Tp&&) = delete; 270 #endif 271 272 struct _LIBCPP_TYPE_VIS_ONLY piecewise_construct_t { }; 273 #if defined(_LIBCPP_HAS_NO_CONSTEXPR) || defined(_LIBCPP_BUILDING_UTILITY) 274 extern const piecewise_construct_t piecewise_construct;// = piecewise_construct_t(); 275 #else 276 constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t(); 277 #endif 278 279 template <class _T1, class _T2> 280 struct _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 // pair(const pair&) = default; 289 // pair(pair&&) = default; 290 291 #ifndef _LIBCPP_HAS_NO_DEFAULT_FUNCTION_TEMPLATE_ARGS 292 template <bool _Dummy = true, class = typename enable_if< 293 __dependent_type<is_default_constructible<_T1>, _Dummy>::value && 294 __dependent_type<is_default_constructible<_T2>, _Dummy>::value 295 >::type> 296 #endif 297 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR pair() : first(), second() {} 298 299 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 300 pair(const _T1& __x, const _T2& __y) 301 : first(__x), second(__y) {} 302 303 template<class _U1, class _U2> 304 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 305 pair(const pair<_U1, _U2>& __p 306 #ifndef _LIBCPP_HAS_NO_ADVANCED_SFINAE 307 ,typename enable_if<is_convertible<const _U1&, _T1>::value && 308 is_convertible<const _U2&, _T2>::value>::type* = 0 309 #endif 310 ) 311 : first(__p.first), second(__p.second) {} 312 313 #if !defined(_LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS) && _LIBCPP_TRIVIAL_PAIR_COPY_CTOR 314 _LIBCPP_INLINE_VISIBILITY 315 pair(const pair& __p) = default; 316 #elif !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) || !_LIBCPP_TRIVIAL_PAIR_COPY_CTOR 317 _LIBCPP_INLINE_VISIBILITY 318 pair(const pair& __p) 319 _NOEXCEPT_(is_nothrow_copy_constructible<first_type>::value && 320 is_nothrow_copy_constructible<second_type>::value) 321 : first(__p.first), 322 second(__p.second) 323 { 324 } 325 #endif 326 327 _LIBCPP_INLINE_VISIBILITY 328 pair& operator=(const pair& __p) 329 _NOEXCEPT_(is_nothrow_copy_assignable<first_type>::value && 330 is_nothrow_copy_assignable<second_type>::value) 331 { 332 first = __p.first; 333 second = __p.second; 334 return *this; 335 } 336 337 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 338 339 template <class _U1, class _U2, 340 class = typename enable_if<is_convertible<_U1, first_type>::value && 341 is_convertible<_U2, second_type>::value>::type> 342 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 343 pair(_U1&& __u1, _U2&& __u2) 344 : first(_VSTD::forward<_U1>(__u1)), 345 second(_VSTD::forward<_U2>(__u2)) 346 {} 347 348 template<class _U1, class _U2> 349 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 350 pair(pair<_U1, _U2>&& __p, 351 typename enable_if<is_convertible<_U1, _T1>::value && 352 is_convertible<_U2, _T2>::value>::type* = 0) 353 : first(_VSTD::forward<_U1>(__p.first)), 354 second(_VSTD::forward<_U2>(__p.second)) {} 355 356 #ifndef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS 357 _LIBCPP_INLINE_VISIBILITY 358 pair(pair&& __p) = default; 359 #else 360 _LIBCPP_INLINE_VISIBILITY 361 pair(pair&& __p) _NOEXCEPT_(is_nothrow_move_constructible<first_type>::value && 362 is_nothrow_move_constructible<second_type>::value) 363 : first(_VSTD::forward<first_type>(__p.first)), 364 second(_VSTD::forward<second_type>(__p.second)) 365 { 366 } 367 #endif 368 369 _LIBCPP_INLINE_VISIBILITY 370 pair& 371 operator=(pair&& __p) _NOEXCEPT_(is_nothrow_move_assignable<first_type>::value && 372 is_nothrow_move_assignable<second_type>::value) 373 { 374 first = _VSTD::forward<first_type>(__p.first); 375 second = _VSTD::forward<second_type>(__p.second); 376 return *this; 377 } 378 379 #ifndef _LIBCPP_HAS_NO_VARIADICS 380 381 template<class _Tuple, 382 class = typename enable_if<__tuple_convertible<_Tuple, pair>::value>::type> 383 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 384 pair(_Tuple&& __p) 385 : first(_VSTD::forward<typename tuple_element<0, 386 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<0>(__p))), 387 second(_VSTD::forward<typename tuple_element<1, 388 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<1>(__p))) 389 {} 390 391 392 393 template <class... _Args1, class... _Args2> 394 _LIBCPP_INLINE_VISIBILITY 395 pair(piecewise_construct_t __pc, tuple<_Args1...> __first_args, 396 tuple<_Args2...> __second_args) 397 : pair(__pc, __first_args, __second_args, 398 typename __make_tuple_indices<sizeof...(_Args1)>::type(), 399 typename __make_tuple_indices<sizeof...(_Args2) >::type()) 400 {} 401 402 template <class _Tuple, 403 class = typename enable_if<__tuple_assignable<_Tuple, pair>::value>::type> 404 _LIBCPP_INLINE_VISIBILITY 405 pair& 406 operator=(_Tuple&& __p) 407 { 408 typedef typename __make_tuple_types<_Tuple>::type _TupleRef; 409 typedef typename tuple_element<0, _TupleRef>::type _U0; 410 typedef typename tuple_element<1, _TupleRef>::type _U1; 411 first = _VSTD::forward<_U0>(_VSTD::get<0>(__p)); 412 second = _VSTD::forward<_U1>(_VSTD::get<1>(__p)); 413 return *this; 414 } 415 416 #endif // _LIBCPP_HAS_NO_VARIADICS 417 418 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 419 _LIBCPP_INLINE_VISIBILITY 420 void 421 swap(pair& __p) _NOEXCEPT_(__is_nothrow_swappable<first_type>::value && 422 __is_nothrow_swappable<second_type>::value) 423 { 424 using _VSTD::swap; 425 swap(first, __p.first); 426 swap(second, __p.second); 427 } 428 private: 429 430 #ifndef _LIBCPP_HAS_NO_VARIADICS 431 template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2> 432 _LIBCPP_INLINE_VISIBILITY 433 pair(piecewise_construct_t, 434 tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args, 435 __tuple_indices<_I1...>, __tuple_indices<_I2...>); 436 #endif // _LIBCPP_HAS_NO_VARIADICS 437 }; 438 439 template <class _T1, class _T2> 440 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 441 bool 442 operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 443 { 444 return __x.first == __y.first && __x.second == __y.second; 445 } 446 447 template <class _T1, class _T2> 448 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 449 bool 450 operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 451 { 452 return !(__x == __y); 453 } 454 455 template <class _T1, class _T2> 456 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 457 bool 458 operator< (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 459 { 460 return __x.first < __y.first || (!(__y.first < __x.first) && __x.second < __y.second); 461 } 462 463 template <class _T1, class _T2> 464 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 465 bool 466 operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 467 { 468 return __y < __x; 469 } 470 471 template <class _T1, class _T2> 472 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 473 bool 474 operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 475 { 476 return !(__x < __y); 477 } 478 479 template <class _T1, class _T2> 480 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 481 bool 482 operator<=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 483 { 484 return !(__y < __x); 485 } 486 487 template <class _T1, class _T2> 488 inline _LIBCPP_INLINE_VISIBILITY 489 typename enable_if 490 < 491 __is_swappable<_T1>::value && 492 __is_swappable<_T2>::value, 493 void 494 >::type 495 swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y) 496 _NOEXCEPT_((__is_nothrow_swappable<_T1>::value && 497 __is_nothrow_swappable<_T2>::value)) 498 { 499 __x.swap(__y); 500 } 501 502 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 503 504 505 template <class _Tp> 506 struct __make_pair_return_impl 507 { 508 typedef _Tp type; 509 }; 510 511 template <class _Tp> 512 struct __make_pair_return_impl<reference_wrapper<_Tp>> 513 { 514 typedef _Tp& type; 515 }; 516 517 template <class _Tp> 518 struct __make_pair_return 519 { 520 typedef typename __make_pair_return_impl<typename decay<_Tp>::type>::type type; 521 }; 522 523 template <class _T1, class _T2> 524 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 525 pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type> 526 make_pair(_T1&& __t1, _T2&& __t2) 527 { 528 return pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type> 529 (_VSTD::forward<_T1>(__t1), _VSTD::forward<_T2>(__t2)); 530 } 531 532 #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES 533 534 template <class _T1, class _T2> 535 inline _LIBCPP_INLINE_VISIBILITY 536 pair<_T1,_T2> 537 make_pair(_T1 __x, _T2 __y) 538 { 539 return pair<_T1, _T2>(__x, __y); 540 } 541 542 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 543 544 template <class _T1, class _T2> 545 class _LIBCPP_TYPE_VIS_ONLY tuple_size<pair<_T1, _T2> > 546 : public integral_constant<size_t, 2> {}; 547 548 template <class _T1, class _T2> 549 class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, pair<_T1, _T2> > 550 { 551 public: 552 typedef _T1 type; 553 }; 554 555 template <class _T1, class _T2> 556 class _LIBCPP_TYPE_VIS_ONLY tuple_element<1, pair<_T1, _T2> > 557 { 558 public: 559 typedef _T2 type; 560 }; 561 562 template <size_t _Ip> struct __get_pair; 563 564 template <> 565 struct __get_pair<0> 566 { 567 template <class _T1, class _T2> 568 static 569 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 570 _T1& 571 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;} 572 573 template <class _T1, class _T2> 574 static 575 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 576 const _T1& 577 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;} 578 579 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 580 581 template <class _T1, class _T2> 582 static 583 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 584 _T1&& 585 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T1>(__p.first);} 586 587 template <class _T1, class _T2> 588 static 589 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 590 const _T1&& 591 get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<const _T1>(__p.first);} 592 593 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 594 }; 595 596 template <> 597 struct __get_pair<1> 598 { 599 template <class _T1, class _T2> 600 static 601 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 602 _T2& 603 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;} 604 605 template <class _T1, class _T2> 606 static 607 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 608 const _T2& 609 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;} 610 611 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 612 613 template <class _T1, class _T2> 614 static 615 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 616 _T2&& 617 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T2>(__p.second);} 618 619 template <class _T1, class _T2> 620 static 621 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 622 const _T2&& 623 get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<const _T2>(__p.second);} 624 625 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 626 }; 627 628 template <size_t _Ip, class _T1, class _T2> 629 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 630 typename tuple_element<_Ip, pair<_T1, _T2> >::type& 631 get(pair<_T1, _T2>& __p) _NOEXCEPT 632 { 633 return __get_pair<_Ip>::get(__p); 634 } 635 636 template <size_t _Ip, class _T1, class _T2> 637 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 638 const typename tuple_element<_Ip, pair<_T1, _T2> >::type& 639 get(const pair<_T1, _T2>& __p) _NOEXCEPT 640 { 641 return __get_pair<_Ip>::get(__p); 642 } 643 644 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 645 646 template <size_t _Ip, class _T1, class _T2> 647 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 648 typename tuple_element<_Ip, pair<_T1, _T2> >::type&& 649 get(pair<_T1, _T2>&& __p) _NOEXCEPT 650 { 651 return __get_pair<_Ip>::get(_VSTD::move(__p)); 652 } 653 654 template <size_t _Ip, class _T1, class _T2> 655 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 656 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&& 657 get(const pair<_T1, _T2>&& __p) _NOEXCEPT 658 { 659 return __get_pair<_Ip>::get(_VSTD::move(__p)); 660 } 661 662 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 663 664 #if _LIBCPP_STD_VER > 11 665 template <class _T1, class _T2> 666 inline _LIBCPP_INLINE_VISIBILITY 667 constexpr _T1 & get(pair<_T1, _T2>& __p) _NOEXCEPT 668 { 669 return __get_pair<0>::get(__p); 670 } 671 672 template <class _T1, class _T2> 673 inline _LIBCPP_INLINE_VISIBILITY 674 constexpr _T1 const & get(pair<_T1, _T2> const& __p) _NOEXCEPT 675 { 676 return __get_pair<0>::get(__p); 677 } 678 679 template <class _T1, class _T2> 680 inline _LIBCPP_INLINE_VISIBILITY 681 constexpr _T1 && get(pair<_T1, _T2>&& __p) _NOEXCEPT 682 { 683 return __get_pair<0>::get(_VSTD::move(__p)); 684 } 685 686 template <class _T1, class _T2> 687 inline _LIBCPP_INLINE_VISIBILITY 688 constexpr _T1 const && get(pair<_T1, _T2> const&& __p) _NOEXCEPT 689 { 690 return __get_pair<0>::get(_VSTD::move(__p)); 691 } 692 693 template <class _T1, class _T2> 694 inline _LIBCPP_INLINE_VISIBILITY 695 constexpr _T1 & get(pair<_T2, _T1>& __p) _NOEXCEPT 696 { 697 return __get_pair<1>::get(__p); 698 } 699 700 template <class _T1, class _T2> 701 inline _LIBCPP_INLINE_VISIBILITY 702 constexpr _T1 const & get(pair<_T2, _T1> const& __p) _NOEXCEPT 703 { 704 return __get_pair<1>::get(__p); 705 } 706 707 template <class _T1, class _T2> 708 inline _LIBCPP_INLINE_VISIBILITY 709 constexpr _T1 && get(pair<_T2, _T1>&& __p) _NOEXCEPT 710 { 711 return __get_pair<1>::get(_VSTD::move(__p)); 712 } 713 714 template <class _T1, class _T2> 715 inline _LIBCPP_INLINE_VISIBILITY 716 constexpr _T1 const && get(pair<_T2, _T1> const&& __p) _NOEXCEPT 717 { 718 return __get_pair<1>::get(_VSTD::move(__p)); 719 } 720 721 #endif 722 723 #if _LIBCPP_STD_VER > 11 724 725 template<class _Tp, _Tp... _Ip> 726 struct _LIBCPP_TYPE_VIS_ONLY integer_sequence 727 { 728 typedef _Tp value_type; 729 static_assert( is_integral<_Tp>::value, 730 "std::integer_sequence can only be instantiated with an integral type" ); 731 static 732 _LIBCPP_INLINE_VISIBILITY 733 constexpr 734 size_t 735 size() noexcept { return sizeof...(_Ip); } 736 }; 737 738 template<size_t... _Ip> 739 using index_sequence = integer_sequence<size_t, _Ip...>; 740 741 #if __has_builtin(__make_integer_seq) && !defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE) 742 743 template <class _Tp, _Tp _Ep> 744 struct __make_integer_sequence 745 { 746 typedef __make_integer_seq<integer_sequence, _Tp, _Ep> type; 747 }; 748 749 #else 750 751 namespace __detail { 752 753 template<typename _Tp, size_t ..._Extra> struct __repeat; 754 template<typename _Tp, _Tp ..._Np, size_t ..._Extra> struct __repeat<integer_sequence<_Tp, _Np...>, _Extra...> { 755 typedef integer_sequence<_Tp, 756 _Np..., 757 sizeof...(_Np) + _Np..., 758 2 * sizeof...(_Np) + _Np..., 759 3 * sizeof...(_Np) + _Np..., 760 4 * sizeof...(_Np) + _Np..., 761 5 * sizeof...(_Np) + _Np..., 762 6 * sizeof...(_Np) + _Np..., 763 7 * sizeof...(_Np) + _Np..., 764 _Extra...> type; 765 }; 766 767 template<size_t _Np> struct __parity; 768 template<size_t _Np> struct __make : __parity<_Np % 8>::template __pmake<_Np> {}; 769 770 template<> struct __make<0> { typedef integer_sequence<size_t> type; }; 771 template<> struct __make<1> { typedef integer_sequence<size_t, 0> type; }; 772 template<> struct __make<2> { typedef integer_sequence<size_t, 0, 1> type; }; 773 template<> struct __make<3> { typedef integer_sequence<size_t, 0, 1, 2> type; }; 774 template<> struct __make<4> { typedef integer_sequence<size_t, 0, 1, 2, 3> type; }; 775 template<> struct __make<5> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4> type; }; 776 template<> struct __make<6> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4, 5> type; }; 777 template<> struct __make<7> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4, 5, 6> type; }; 778 779 template<> struct __parity<0> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type> {}; }; 780 template<> struct __parity<1> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 1> {}; }; 781 template<> struct __parity<2> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 2, _Np - 1> {}; }; 782 template<> struct __parity<3> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 3, _Np - 2, _Np - 1> {}; }; 783 template<> struct __parity<4> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; }; 784 template<> 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> {}; }; 785 template<> 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> {}; }; 786 template<> 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> {}; }; 787 788 template<typename _Tp, typename _Up> struct __convert { 789 template<typename> struct __result; 790 template<_Tp ..._Np> struct __result<integer_sequence<_Tp, _Np...> > { typedef integer_sequence<_Up, _Np...> type; }; 791 }; 792 template<typename _Tp> struct __convert<_Tp, _Tp> { template<typename _Up> struct __result { typedef _Up type; }; }; 793 794 } 795 796 template<typename _Tp, _Tp _Np> using __make_integer_sequence_unchecked = 797 typename __detail::__convert<size_t, _Tp>::template __result<typename __detail::__make<_Np>::type>::type; 798 799 template <class _Tp, _Tp _Ep> 800 struct __make_integer_sequence 801 { 802 static_assert(is_integral<_Tp>::value, 803 "std::make_integer_sequence can only be instantiated with an integral type" ); 804 static_assert(0 <= _Ep, "std::make_integer_sequence must have a non-negative sequence length"); 805 // Workaround GCC bug by preventing bad installations when 0 <= _Ep 806 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68929 807 typedef __make_integer_sequence_unchecked<_Tp, 0 <= _Ep ? _Ep : 0> type; 808 }; 809 810 #endif 811 812 template<class _Tp, _Tp _Np> 813 using make_integer_sequence = typename __make_integer_sequence<_Tp, _Np>::type; 814 815 template<size_t _Np> 816 using make_index_sequence = make_integer_sequence<size_t, _Np>; 817 818 template<class... _Tp> 819 using index_sequence_for = make_index_sequence<sizeof...(_Tp)>; 820 821 #endif // _LIBCPP_STD_VER > 11 822 823 #if _LIBCPP_STD_VER > 11 824 template<class _T1, class _T2 = _T1> 825 inline _LIBCPP_INLINE_VISIBILITY 826 _T1 exchange(_T1& __obj, _T2 && __new_value) 827 { 828 _T1 __old_value = _VSTD::move(__obj); 829 __obj = _VSTD::forward<_T2>(__new_value); 830 return __old_value; 831 } 832 #endif // _LIBCPP_STD_VER > 11 833 834 _LIBCPP_END_NAMESPACE_STD 835 836 #endif // _LIBCPP_UTILITY 837
