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> typename add_rvalue_reference<T>::type declval() noexcept; 56 57 template <class T1, class T2> 58 struct 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 86 template <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 87 template <class T1, class T2> bool operator!=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 88 template <class T1, class T2> bool operator< (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 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 93 template <class T1, class T2> pair<V1, V2> make_pair(T1&&, T2&&); // constexpr in C++14 94 template <class T1, class T2> 95 void 96 swap(pair<T1, T2>& x, pair<T1, T2>& y) noexcept(noexcept(x.swap(y))); 97 98 struct piecewise_construct_t { }; 99 constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t(); 100 101 template <class T> class tuple_size; 102 template <size_t I, class T> class tuple_element; 103 104 template <class T1, class T2> struct tuple_size<pair<T1, T2> >; 105 template <class T1, class T2> struct tuple_element<0, pair<T1, T2> >; 106 template <class T1, class T2> struct tuple_element<1, pair<T1, T2> >; 107 108 template<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++14 111 112 template<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++14 115 116 template<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++14 119 120 template<class T1, class T2> 121 constexpr T1& get(pair<T1, T2>&) noexcept; // C++14 122 123 template<size_t I, class T1, class T2> 124 constexpr T1 const& get(pair<T1, T2> const &) noexcept; // C++14 125 126 template<size_t I, class T1, class T2> 127 constexpr T1&& get(pair<T1, T2>&&) noexcept; // C++14 128 129 // C++14 130 131 template<class T, T... I> 132 struct integer_sequence 133 { 134 typedef T value_type; 135 136 static constexpr size_t size() noexcept; 137 }; 138 139 template<size_t... I> 140 using index_sequence = integer_sequence<size_t, I...>; 141 142 template<class T, T N> 143 using make_integer_sequence = integer_sequence<T, 0, 1, ..., N-1>; 144 template<size_t N> 145 using make_index_sequence = make_integer_sequence<size_t, N>; 146 147 template<class... T> 148 using index_sequence_for = make_index_sequence<sizeof...(T)>; 149 150 template<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 165 166 namespace rel_ops 167 { 168 169 template<class _Tp> 170 inline _LIBCPP_INLINE_VISIBILITY 171 bool 172 operator!=(const _Tp& __x, const _Tp& __y) 173 { 174 return !(__x == __y); 175 } 176 177 template<class _Tp> 178 inline _LIBCPP_INLINE_VISIBILITY 179 bool 180 operator> (const _Tp& __x, const _Tp& __y) 181 { 182 return __y < __x; 183 } 184 185 template<class _Tp> 186 inline _LIBCPP_INLINE_VISIBILITY 187 bool 188 operator<=(const _Tp& __x, const _Tp& __y) 189 { 190 return !(__y < __x); 191 } 192 193 template<class _Tp> 194 inline _LIBCPP_INLINE_VISIBILITY 195 bool 196 operator>=(const _Tp& __x, const _Tp& __y) 197 { 198 return !(__x < __y); 199 } 200 201 } // rel_ops 202 203 // swap_ranges 204 205 // forward 206 template<class _Tp, size_t _Np> 207 inline _LIBCPP_INLINE_VISIBILITY 208 void swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value); 209 210 template <class _ForwardIterator1, class _ForwardIterator2> 211 inline _LIBCPP_INLINE_VISIBILITY 212 _ForwardIterator2 213 swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2) 214 { 215 for(; __first1 != __last1; ++__first1, (void) ++__first2) 216 swap(*__first1, *__first2); 217 return __first2; 218 } 219 220 template<class _Tp, size_t _Np> 221 inline _LIBCPP_INLINE_VISIBILITY 222 void 223 swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value) 224 { 225 _VSTD::swap_ranges(__a, __a + _Np, __b); 226 } 227 228 template <class _Tp> 229 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 230 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 231 typename 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 238 const _Tp& 239 #endif 240 move_if_noexcept(_Tp& __x) _NOEXCEPT 241 { 242 return _VSTD::move(__x); 243 } 244 245 struct _LIBCPP_TYPE_VIS_ONLY piecewise_construct_t { }; 246 #if defined(_LIBCPP_HAS_NO_CONSTEXPR) || defined(_LIBCPP_BUILDING_UTILITY) 247 extern const piecewise_construct_t piecewise_construct;// = piecewise_construct_t(); 248 #else 249 constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t(); 250 #endif 251 252 template <class _T1, class _T2> 253 struct _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 } 394 private: 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 }; 404 405 template <class _T1, class _T2> 406 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 407 bool 408 operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 409 { 410 return __x.first == __y.first && __x.second == __y.second; 411 } 412 413 template <class _T1, class _T2> 414 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 415 bool 416 operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 417 { 418 return !(__x == __y); 419 } 420 421 template <class _T1, class _T2> 422 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 423 bool 424 operator< (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 } 428 429 template <class _T1, class _T2> 430 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 431 bool 432 operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 433 { 434 return __y < __x; 435 } 436 437 template <class _T1, class _T2> 438 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 439 bool 440 operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 441 { 442 return !(__x < __y); 443 } 444 445 template <class _T1, class _T2> 446 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 447 bool 448 operator<=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 449 { 450 return !(__y < __x); 451 } 452 453 template <class _T1, class _T2> 454 inline _LIBCPP_INLINE_VISIBILITY 455 typename enable_if 456 < 457 __is_swappable<_T1>::value && 458 __is_swappable<_T2>::value, 459 void 460 >::type 461 swap(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 469 470 template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY reference_wrapper; 471 472 template <class _Tp> 473 struct __make_pair_return_impl 474 { 475 typedef _Tp type; 476 }; 477 478 template <class _Tp> 479 struct __make_pair_return_impl<reference_wrapper<_Tp>> 480 { 481 typedef _Tp& type; 482 }; 483 484 template <class _Tp> 485 struct __make_pair_return 486 { 487 typedef typename __make_pair_return_impl<typename decay<_Tp>::type>::type type; 488 }; 489 490 template <class _T1, class _T2> 491 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 492 pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type> 493 make_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 500 501 template <class _T1, class _T2> 502 inline _LIBCPP_INLINE_VISIBILITY 503 pair<_T1,_T2> 504 make_pair(_T1 __x, _T2 __y) 505 { 506 return pair<_T1, _T2>(__x, __y); 507 } 508 509 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 510 511 template <class _T1, class _T2> 512 class _LIBCPP_TYPE_VIS_ONLY tuple_size<pair<_T1, _T2> > 513 : public integral_constant<size_t, 2> {}; 514 515 template <class _T1, class _T2> 516 class _LIBCPP_TYPE_VIS_ONLY tuple_size<const pair<_T1, _T2> > 517 : public integral_constant<size_t, 2> {}; 518 519 template <class _T1, class _T2> 520 class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, pair<_T1, _T2> > 521 { 522 public: 523 typedef _T1 type; 524 }; 525 526 template <class _T1, class _T2> 527 class _LIBCPP_TYPE_VIS_ONLY tuple_element<1, pair<_T1, _T2> > 528 { 529 public: 530 typedef _T2 type; 531 }; 532 533 template <class _T1, class _T2> 534 class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, const pair<_T1, _T2> > 535 { 536 public: 537 typedef const _T1 type; 538 }; 539 540 template <class _T1, class _T2> 541 class _LIBCPP_TYPE_VIS_ONLY tuple_element<1, const pair<_T1, _T2> > 542 { 543 public: 544 typedef const _T2 type; 545 }; 546 547 template <size_t _Ip> struct __get_pair; 548 549 template <> 550 struct __get_pair<0> 551 { 552 template <class _T1, class _T2> 553 static 554 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 555 _T1& 556 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;} 557 558 template <class _T1, class _T2> 559 static 560 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 561 const _T1& 562 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;} 563 564 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 565 566 template <class _T1, class _T2> 567 static 568 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 569 _T1&& 570 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T1>(__p.first);} 571 572 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 573 }; 574 575 template <> 576 struct __get_pair<1> 577 { 578 template <class _T1, class _T2> 579 static 580 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 581 _T2& 582 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;} 583 584 template <class _T1, class _T2> 585 static 586 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 587 const _T2& 588 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;} 589 590 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 591 592 template <class _T1, class _T2> 593 static 594 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 595 _T2&& 596 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T2>(__p.second);} 597 598 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 599 }; 600 601 template <size_t _Ip, class _T1, class _T2> 602 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 603 typename tuple_element<_Ip, pair<_T1, _T2> >::type& 604 get(pair<_T1, _T2>& __p) _NOEXCEPT 605 { 606 return __get_pair<_Ip>::get(__p); 607 } 608 609 template <size_t _Ip, class _T1, class _T2> 610 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 611 const typename tuple_element<_Ip, pair<_T1, _T2> >::type& 612 get(const pair<_T1, _T2>& __p) _NOEXCEPT 613 { 614 return __get_pair<_Ip>::get(__p); 615 } 616 617 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 618 619 template <size_t _Ip, class _T1, class _T2> 620 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 621 typename tuple_element<_Ip, pair<_T1, _T2> >::type&& 622 get(pair<_T1, _T2>&& __p) _NOEXCEPT 623 { 624 return __get_pair<_Ip>::get(_VSTD::move(__p)); 625 } 626 627 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 628 629 #if _LIBCPP_STD_VER > 11 630 template <class _T1, class _T2> 631 inline _LIBCPP_INLINE_VISIBILITY 632 constexpr _T1 & get(pair<_T1, _T2>& __p) _NOEXCEPT 633 { 634 return __get_pair<0>::get(__p); 635 } 636 637 template <class _T1, class _T2> 638 inline _LIBCPP_INLINE_VISIBILITY 639 constexpr _T1 const & get(pair<_T1, _T2> const& __p) _NOEXCEPT 640 { 641 return __get_pair<0>::get(__p); 642 } 643 644 template <class _T1, class _T2> 645 inline _LIBCPP_INLINE_VISIBILITY 646 constexpr _T1 && get(pair<_T1, _T2>&& __p) _NOEXCEPT 647 { 648 return __get_pair<0>::get(_VSTD::move(__p)); 649 } 650 651 template <class _T1, class _T2> 652 inline _LIBCPP_INLINE_VISIBILITY 653 constexpr _T1 & get(pair<_T2, _T1>& __p) _NOEXCEPT 654 { 655 return __get_pair<1>::get(__p); 656 } 657 658 template <class _T1, class _T2> 659 inline _LIBCPP_INLINE_VISIBILITY 660 constexpr _T1 const & get(pair<_T2, _T1> const& __p) _NOEXCEPT 661 { 662 return __get_pair<1>::get(__p); 663 } 664 665 template <class _T1, class _T2> 666 inline _LIBCPP_INLINE_VISIBILITY 667 constexpr _T1 && get(pair<_T2, _T1>&& __p) _NOEXCEPT 668 { 669 return __get_pair<1>::get(_VSTD::move(__p)); 670 } 671 672 #endif 673 674 #if _LIBCPP_STD_VER > 11 675 676 template<class _Tp, _Tp... _Ip> 677 struct _LIBCPP_TYPE_VIS_ONLY integer_sequence 678 { 679 typedef _Tp value_type; 680 static_assert( is_integral<_Tp>::value, 681 "std::integer_sequence can only be instantiated with an integral type" ); 682 static 683 _LIBCPP_INLINE_VISIBILITY 684 constexpr 685 size_t 686 size() noexcept { return sizeof...(_Ip); } 687 }; 688 689 template<size_t... _Ip> 690 using index_sequence = integer_sequence<size_t, _Ip...>; 691 692 namespace __detail { 693 694 template<typename _Tp, size_t ..._Extra> struct __repeat; 695 template<typename _Tp, _Tp ..._Np, size_t ..._Extra> struct __repeat<integer_sequence<_Tp, _Np...>, _Extra...> { 696 typedef integer_sequence<_Tp, 697 _Np..., 698 sizeof...(_Np) + _Np..., 699 2 * sizeof...(_Np) + _Np..., 700 3 * sizeof...(_Np) + _Np..., 701 4 * sizeof...(_Np) + _Np..., 702 5 * sizeof...(_Np) + _Np..., 703 6 * sizeof...(_Np) + _Np..., 704 7 * sizeof...(_Np) + _Np..., 705 _Extra...> type; 706 }; 707 708 template<size_t _Np> struct __parity; 709 template<size_t _Np> struct __make : __parity<_Np % 8>::template __pmake<_Np> {}; 710 711 template<> struct __make<0> { typedef integer_sequence<size_t> type; }; 712 template<> struct __make<1> { typedef integer_sequence<size_t, 0> type; }; 713 template<> struct __make<2> { typedef integer_sequence<size_t, 0, 1> type; }; 714 template<> struct __make<3> { typedef integer_sequence<size_t, 0, 1, 2> type; }; 715 template<> struct __make<4> { typedef integer_sequence<size_t, 0, 1, 2, 3> type; }; 716 template<> struct __make<5> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4> type; }; 717 template<> struct __make<6> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4, 5> type; }; 718 template<> struct __make<7> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4, 5, 6> type; }; 719 720 template<> struct __parity<0> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type> {}; }; 721 template<> struct __parity<1> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 1> {}; }; 722 template<> struct __parity<2> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 2, _Np - 1> {}; }; 723 template<> struct __parity<3> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 3, _Np - 2, _Np - 1> {}; }; 724 template<> struct __parity<4> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; }; 725 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> {}; }; 726 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> {}; }; 727 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> {}; }; 728 729 template<typename _Tp, typename _Up> struct __convert { 730 template<typename> struct __result; 731 template<_Tp ..._Np> struct __result<integer_sequence<_Tp, _Np...> > { typedef integer_sequence<_Up, _Np...> type; }; 732 }; 733 template<typename _Tp> struct __convert<_Tp, _Tp> { template<typename _Up> struct __result { typedef _Up type; }; }; 734 735 } 736 737 template<typename _Tp, _Tp _Np> using __make_integer_sequence_unchecked = 738 typename __detail::__convert<size_t, _Tp>::template __result<typename __detail::__make<_Np>::type>::type; 739 740 template <class _Tp, _Tp _Ep> 741 struct __make_integer_sequence 742 { 743 static_assert(is_integral<_Tp>::value, 744 "std::make_integer_sequence can only be instantiated with an integral type" ); 745 static_assert(0 <= _Ep, "std::make_integer_sequence input shall not be negative"); 746 typedef __make_integer_sequence_unchecked<_Tp, _Ep> type; 747 }; 748 749 template<class _Tp, _Tp _Np> 750 using make_integer_sequence = typename __make_integer_sequence<_Tp, _Np>::type; 751 752 template<size_t _Np> 753 using make_index_sequence = make_integer_sequence<size_t, _Np>; 754 755 template<class... _Tp> 756 using index_sequence_for = make_index_sequence<sizeof...(_Tp)>; 757 758 #endif // _LIBCPP_STD_VER > 11 759 760 #if _LIBCPP_STD_VER > 11 761 template<class _T1, class _T2 = _T1> 762 inline _LIBCPP_INLINE_VISIBILITY 763 _T1 exchange(_T1& __obj, _T2 && __new_value) 764 { 765 _T1 __old_value = _VSTD::move(__obj); 766 __obj = _VSTD::forward<_T2>(__new_value); 767 return __old_value; 768 } 769 #endif // _LIBCPP_STD_VER > 11 770 771 _LIBCPP_END_NAMESPACE_STD 772 773 #endif // _LIBCPP_UTILITY 774
