utility revision 285830
1289177Speter// -*- C++ -*- 2289177Speter//===-------------------------- utility -----------------------------------===// 3289177Speter// 4289177Speter// The LLVM Compiler Infrastructure 5289177Speter// 6289177Speter// This file is dual licensed under the MIT and the University of Illinois Open 7289177Speter// Source Licenses. See LICENSE.TXT for details. 8289177Speter// 9289177Speter//===----------------------------------------------------------------------===// 10289177Speter 11289177Speter#ifndef _LIBCPP_UTILITY 12289177Speter#define _LIBCPP_UTILITY 13289177Speter 14289177Speter/* 15289177Speter utility synopsis 16289177Speter 17289177Speternamespace std 18289177Speter{ 19289177Speter 20289177Spetertemplate <class T> 21289177Speter void 22289177Speter swap(T& a, T& b); 23289177Speter 24289177Speternamespace rel_ops 25289177Speter{ 26289177Speter template<class T> bool operator!=(const T&, const T&); 27289177Speter template<class T> bool operator> (const T&, const T&); 28289177Speter template<class T> bool operator<=(const T&, const T&); 29289177Speter template<class T> bool operator>=(const T&, const T&); 30289177Speter} 31289177Speter 32289177Spetertemplate<class T> 33289177Spetervoid 34289177Speterswap(T& a, T& b) noexcept(is_nothrow_move_constructible<T>::value && 35289177Speter is_nothrow_move_assignable<T>::value); 36289177Speter 37289177Spetertemplate <class T, size_t N> 38289177Spetervoid 39289177Speterswap(T (&a)[N], T (&b)[N]) noexcept(noexcept(swap(*a, *b))); 40289177Speter 41289177Spetertemplate <class T> T&& forward(typename remove_reference<T>::type& t) noexcept; // constexpr in C++14 42289177Spetertemplate <class T> T&& forward(typename remove_reference<T>::type&& t) noexcept; // constexpr in C++14 43289177Speter 44289177Spetertemplate <class T> typename remove_reference<T>::type&& move(T&&) noexcept; // constexpr in C++14 45289177Speter 46289177Spetertemplate <class T> 47289177Speter typename conditional 48289177Speter < 49289177Speter !is_nothrow_move_constructible<T>::value && is_copy_constructible<T>::value, 50289177Speter const T&, 51289177Speter T&& 52289177Speter >::type 53289177Speter move_if_noexcept(T& x) noexcept; // constexpr in C++14 54289177Speter 55289177Spetertemplate <class T> typename add_rvalue_reference<T>::type declval() noexcept; 56289177Speter 57289177Spetertemplate <class T1, class T2> 58289177Speterstruct pair 59289177Speter{ 60289177Speter typedef T1 first_type; 61289177Speter typedef T2 second_type; 62289177Speter 63289177Speter T1 first; 64289177Speter T2 second; 65289177Speter 66289177Speter pair(const pair&) = default; 67289177Speter pair(pair&&) = default; 68289177Speter constexpr pair(); 69289177Speter pair(const T1& x, const T2& y); // constexpr in C++14 70289177Speter template <class U, class V> pair(U&& x, V&& y); // constexpr in C++14 71289177Speter template <class U, class V> pair(const pair<U, V>& p); // constexpr in C++14 72289177Speter template <class U, class V> pair(pair<U, V>&& p); // constexpr in C++14 73289177Speter template <class... Args1, class... Args2> 74289177Speter pair(piecewise_construct_t, tuple<Args1...> first_args, 75289177Speter tuple<Args2...> second_args); 76289177Speter 77289177Speter template <class U, class V> pair& operator=(const pair<U, V>& p); 78289177Speter pair& operator=(pair&& p) noexcept(is_nothrow_move_assignable<T1>::value && 79289177Speter is_nothrow_move_assignable<T2>::value); 80289177Speter template <class U, class V> pair& operator=(pair<U, V>&& p); 81289177Speter 82289177Speter void swap(pair& p) noexcept(noexcept(swap(first, p.first)) && 83289177Speter noexcept(swap(second, p.second))); 84289177Speter}; 85289177Speter 86289177Spetertemplate <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 87289177Spetertemplate <class T1, class T2> bool operator!=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 88289177Spetertemplate <class T1, class T2> bool operator< (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 89289177Spetertemplate <class T1, class T2> bool operator> (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 90289177Spetertemplate <class T1, class T2> bool operator>=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 91289177Spetertemplate <class T1, class T2> bool operator<=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 92289177Speter 93289177Spetertemplate <class T1, class T2> pair<V1, V2> make_pair(T1&&, T2&&); // constexpr in C++14 94289177Spetertemplate <class T1, class T2> 95289177Spetervoid 96289177Speterswap(pair<T1, T2>& x, pair<T1, T2>& y) noexcept(noexcept(x.swap(y))); 97289177Speter 98289177Speterstruct piecewise_construct_t { }; 99289177Speterconstexpr piecewise_construct_t piecewise_construct = piecewise_construct_t(); 100289177Speter 101289177Spetertemplate <class T> class tuple_size; 102289177Spetertemplate <size_t I, class T> class tuple_element; 103289177Speter 104289177Spetertemplate <class T1, class T2> struct tuple_size<pair<T1, T2> >; 105289177Spetertemplate <class T1, class T2> struct tuple_element<0, pair<T1, T2> >; 106289177Spetertemplate <class T1, class T2> struct tuple_element<1, pair<T1, T2> >; 107289177Speter 108289177Spetertemplate<size_t I, class T1, class T2> 109289177Speter typename tuple_element<I, pair<T1, T2> >::type& 110289177Speter get(pair<T1, T2>&) noexcept; // constexpr in C++14 111289177Speter 112289177Spetertemplate<size_t I, class T1, class T2> 113289177Speter const typename const tuple_element<I, pair<T1, T2> >::type& 114289177Speter get(const pair<T1, T2>&) noexcept; // constexpr in C++14 115289177Speter 116289177Spetertemplate<size_t I, class T1, class T2> 117289177Speter typename tuple_element<I, pair<T1, T2> >::type&& 118289177Speter get(pair<T1, T2>&&) noexcept; // constexpr in C++14 119289177Speter 120289177Spetertemplate<class T1, class T2> 121289177Speter constexpr T1& get(pair<T1, T2>&) noexcept; // C++14 122289177Speter 123289177Spetertemplate<size_t I, class T1, class T2> 124289177Speter constexpr T1 const& get(pair<T1, T2> const &) noexcept; // C++14 125289177Speter 126289177Spetertemplate<size_t I, class T1, class T2> 127289177Speter constexpr T1&& get(pair<T1, T2>&&) noexcept; // C++14 128289177Speter 129289177Speter// C++14 130289177Speter 131289177Spetertemplate<class T, T... I> 132289177Speterstruct integer_sequence 133289177Speter{ 134289177Speter typedef T value_type; 135289177Speter 136289177Speter static constexpr size_t size() noexcept; 137289177Speter}; 138289177Speter 139289177Spetertemplate<size_t... I> 140289177Speter using index_sequence = integer_sequence<size_t, I...>; 141289177Speter 142289177Spetertemplate<class T, T N> 143289177Speter using make_integer_sequence = integer_sequence<T, 0, 1, ..., N-1>; 144289177Spetertemplate<size_t N> 145289177Speter using make_index_sequence = make_integer_sequence<size_t, N>; 146289177Speter 147289177Spetertemplate<class... T> 148289177Speter using index_sequence_for = make_index_sequence<sizeof...(T)>; 149289177Speter 150289177Spetertemplate<class T, class U=T> 151289177Speter T exchange(T& obj, U&& new_value); 152289177Speter} // std 153289177Speter 154289177Speter*/ 155289177Speter 156289177Speter#include <__config> 157289177Speter#include <__tuple> 158289177Speter#include <type_traits> 159289177Speter 160289177Speter#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 161289177Speter#pragma GCC system_header 162289177Speter#endif 163289177Speter 164289177Speter_LIBCPP_BEGIN_NAMESPACE_STD 165289177Speter 166289177Speternamespace rel_ops 167289177Speter{ 168289177Speter 169289177Spetertemplate<class _Tp> 170289177Speterinline _LIBCPP_INLINE_VISIBILITY 171289177Speterbool 172289177Speteroperator!=(const _Tp& __x, const _Tp& __y) 173289177Speter{ 174289177Speter return !(__x == __y); 175289177Speter} 176289177Speter 177289177Spetertemplate<class _Tp> 178289177Speterinline _LIBCPP_INLINE_VISIBILITY 179289177Speterbool 180289177Speteroperator> (const _Tp& __x, const _Tp& __y) 181289177Speter{ 182289177Speter return __y < __x; 183289177Speter} 184289177Speter 185289177Spetertemplate<class _Tp> 186289177Speterinline _LIBCPP_INLINE_VISIBILITY 187289177Speterbool 188289177Speteroperator<=(const _Tp& __x, const _Tp& __y) 189289177Speter{ 190289177Speter return !(__y < __x); 191289177Speter} 192289177Speter 193289177Spetertemplate<class _Tp> 194289177Speterinline _LIBCPP_INLINE_VISIBILITY 195289177Speterbool 196289177Speteroperator>=(const _Tp& __x, const _Tp& __y) 197298845Sdim{ 198289177Speter return !(__x < __y); 199289177Speter} 200298845Sdim 201298845Sdim} // rel_ops 202289177Speter 203289177Speter// swap_ranges 204289177Speter 205289177Spetertemplate <class _ForwardIterator1, class _ForwardIterator2> 206289177Speterinline _LIBCPP_INLINE_VISIBILITY 207289177Speter_ForwardIterator2 208298845Sdimswap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2) 209289177Speter{ 210289177Speter for(; __first1 != __last1; ++__first1, (void) ++__first2) 211298845Sdim swap(*__first1, *__first2); 212298845Sdim return __first2; 213289177Speter} 214289177Speter 215289177Spetertemplate<class _Tp, size_t _Np> 216289177Speterinline _LIBCPP_INLINE_VISIBILITY 217289177Spetervoid 218289177Speterswap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value) 219289177Speter{ 220289177Speter _VSTD::swap_ranges(__a, __a + _Np, __b); 221289177Speter} 222 223template <class _Tp> 224inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 225#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 226typename conditional 227< 228 !is_nothrow_move_constructible<_Tp>::value && is_copy_constructible<_Tp>::value, 229 const _Tp&, 230 _Tp&& 231>::type 232#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES 233const _Tp& 234#endif 235move_if_noexcept(_Tp& __x) _NOEXCEPT 236{ 237 return _VSTD::move(__x); 238} 239 240struct _LIBCPP_TYPE_VIS_ONLY piecewise_construct_t { }; 241#if defined(_LIBCPP_HAS_NO_CONSTEXPR) || defined(_LIBCPP_BUILDING_UTILITY) 242extern const piecewise_construct_t piecewise_construct;// = piecewise_construct_t(); 243#else 244constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t(); 245#endif 246 247template <class _T1, class _T2> 248struct _LIBCPP_TYPE_VIS_ONLY pair 249{ 250 typedef _T1 first_type; 251 typedef _T2 second_type; 252 253 _T1 first; 254 _T2 second; 255 256 // pair(const pair&) = default; 257 // pair(pair&&) = default; 258 259 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR pair() : first(), second() {} 260 261 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 262 pair(const _T1& __x, const _T2& __y) 263 : first(__x), second(__y) {} 264 265 template<class _U1, class _U2> 266 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 267 pair(const pair<_U1, _U2>& __p 268#ifndef _LIBCPP_HAS_NO_ADVANCED_SFINAE 269 ,typename enable_if<is_convertible<const _U1&, _T1>::value && 270 is_convertible<const _U2&, _T2>::value>::type* = 0 271#endif 272 ) 273 : first(__p.first), second(__p.second) {} 274 275#if !defined(_LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS) && _LIBCPP_TRIVIAL_PAIR_COPY_CTOR 276 _LIBCPP_INLINE_VISIBILITY 277 pair(const pair& __p) = default; 278#elif !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) || !_LIBCPP_TRIVIAL_PAIR_COPY_CTOR 279 _LIBCPP_INLINE_VISIBILITY 280 pair(const pair& __p) 281 _NOEXCEPT_(is_nothrow_copy_constructible<first_type>::value && 282 is_nothrow_copy_constructible<second_type>::value) 283 : first(__p.first), 284 second(__p.second) 285 { 286 } 287#endif 288 289 _LIBCPP_INLINE_VISIBILITY 290 pair& operator=(const pair& __p) 291 _NOEXCEPT_(is_nothrow_copy_assignable<first_type>::value && 292 is_nothrow_copy_assignable<second_type>::value) 293 { 294 first = __p.first; 295 second = __p.second; 296 return *this; 297 } 298 299#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 300 301 template <class _U1, class _U2, 302 class = typename enable_if<is_convertible<_U1, first_type>::value && 303 is_convertible<_U2, second_type>::value>::type> 304 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 305 pair(_U1&& __u1, _U2&& __u2) 306 : first(_VSTD::forward<_U1>(__u1)), 307 second(_VSTD::forward<_U2>(__u2)) 308 {} 309 310 template<class _U1, class _U2> 311 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 312 pair(pair<_U1, _U2>&& __p, 313 typename enable_if<is_convertible<_U1, _T1>::value && 314 is_convertible<_U2, _T2>::value>::type* = 0) 315 : first(_VSTD::forward<_U1>(__p.first)), 316 second(_VSTD::forward<_U2>(__p.second)) {} 317 318#ifndef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS 319 _LIBCPP_INLINE_VISIBILITY 320 pair(pair&& __p) = default; 321#else 322 _LIBCPP_INLINE_VISIBILITY 323 pair(pair&& __p) _NOEXCEPT_(is_nothrow_move_constructible<first_type>::value && 324 is_nothrow_move_constructible<second_type>::value) 325 : first(_VSTD::forward<first_type>(__p.first)), 326 second(_VSTD::forward<second_type>(__p.second)) 327 { 328 } 329#endif 330 331 _LIBCPP_INLINE_VISIBILITY 332 pair& 333 operator=(pair&& __p) _NOEXCEPT_(is_nothrow_move_assignable<first_type>::value && 334 is_nothrow_move_assignable<second_type>::value) 335 { 336 first = _VSTD::forward<first_type>(__p.first); 337 second = _VSTD::forward<second_type>(__p.second); 338 return *this; 339 } 340 341#ifndef _LIBCPP_HAS_NO_VARIADICS 342 343 template<class _Tuple, 344 class = typename enable_if<__tuple_convertible<_Tuple, pair>::value>::type> 345 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 346 pair(_Tuple&& __p) 347 : first(_VSTD::forward<typename tuple_element<0, 348 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<0>(__p))), 349 second(_VSTD::forward<typename tuple_element<1, 350 typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<1>(__p))) 351 {} 352 353 354 355 template <class... _Args1, class... _Args2> 356 _LIBCPP_INLINE_VISIBILITY 357 pair(piecewise_construct_t __pc, tuple<_Args1...> __first_args, 358 tuple<_Args2...> __second_args) 359 : pair(__pc, __first_args, __second_args, 360 typename __make_tuple_indices<sizeof...(_Args1)>::type(), 361 typename __make_tuple_indices<sizeof...(_Args2) >::type()) 362 {} 363 364 template <class _Tuple, 365 class = typename enable_if<__tuple_assignable<_Tuple, pair>::value>::type> 366 _LIBCPP_INLINE_VISIBILITY 367 pair& 368 operator=(_Tuple&& __p) 369 { 370 typedef typename __make_tuple_types<_Tuple>::type _TupleRef; 371 typedef typename tuple_element<0, _TupleRef>::type _U0; 372 typedef typename tuple_element<1, _TupleRef>::type _U1; 373 first = _VSTD::forward<_U0>(_VSTD::get<0>(__p)); 374 second = _VSTD::forward<_U1>(_VSTD::get<1>(__p)); 375 return *this; 376 } 377 378#endif // _LIBCPP_HAS_NO_VARIADICS 379 380#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 381 _LIBCPP_INLINE_VISIBILITY 382 void 383 swap(pair& __p) _NOEXCEPT_(__is_nothrow_swappable<first_type>::value && 384 __is_nothrow_swappable<second_type>::value) 385 { 386 _VSTD::iter_swap(&first, &__p.first); 387 _VSTD::iter_swap(&second, &__p.second); 388 } 389private: 390 391#ifndef _LIBCPP_HAS_NO_VARIADICS 392 template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2> 393 _LIBCPP_INLINE_VISIBILITY 394 pair(piecewise_construct_t, 395 tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args, 396 __tuple_indices<_I1...>, __tuple_indices<_I2...>); 397#endif // _LIBCPP_HAS_NO_VARIADICS 398}; 399 400template <class _T1, class _T2> 401inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 402bool 403operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 404{ 405 return __x.first == __y.first && __x.second == __y.second; 406} 407 408template <class _T1, class _T2> 409inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 410bool 411operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 412{ 413 return !(__x == __y); 414} 415 416template <class _T1, class _T2> 417inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 418bool 419operator< (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 420{ 421 return __x.first < __y.first || (!(__y.first < __x.first) && __x.second < __y.second); 422} 423 424template <class _T1, class _T2> 425inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 426bool 427operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 428{ 429 return __y < __x; 430} 431 432template <class _T1, class _T2> 433inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 434bool 435operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 436{ 437 return !(__x < __y); 438} 439 440template <class _T1, class _T2> 441inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 442bool 443operator<=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 444{ 445 return !(__y < __x); 446} 447 448template <class _T1, class _T2> 449inline _LIBCPP_INLINE_VISIBILITY 450typename enable_if 451< 452 __is_swappable<_T1>::value && 453 __is_swappable<_T2>::value, 454 void 455>::type 456swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y) 457 _NOEXCEPT_((__is_nothrow_swappable<_T1>::value && 458 __is_nothrow_swappable<_T2>::value)) 459{ 460 __x.swap(__y); 461} 462 463#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 464 465template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY reference_wrapper; 466 467template <class _Tp> 468struct __make_pair_return_impl 469{ 470 typedef _Tp type; 471}; 472 473template <class _Tp> 474struct __make_pair_return_impl<reference_wrapper<_Tp>> 475{ 476 typedef _Tp& type; 477}; 478 479template <class _Tp> 480struct __make_pair_return 481{ 482 typedef typename __make_pair_return_impl<typename decay<_Tp>::type>::type type; 483}; 484 485template <class _T1, class _T2> 486inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 487pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type> 488make_pair(_T1&& __t1, _T2&& __t2) 489{ 490 return pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type> 491 (_VSTD::forward<_T1>(__t1), _VSTD::forward<_T2>(__t2)); 492} 493 494#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES 495 496template <class _T1, class _T2> 497inline _LIBCPP_INLINE_VISIBILITY 498pair<_T1,_T2> 499make_pair(_T1 __x, _T2 __y) 500{ 501 return pair<_T1, _T2>(__x, __y); 502} 503 504#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 505 506template <class _T1, class _T2> 507 class _LIBCPP_TYPE_VIS_ONLY tuple_size<pair<_T1, _T2> > 508 : public integral_constant<size_t, 2> {}; 509 510template <class _T1, class _T2> 511 class _LIBCPP_TYPE_VIS_ONLY tuple_size<const pair<_T1, _T2> > 512 : public integral_constant<size_t, 2> {}; 513 514template <class _T1, class _T2> 515class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, pair<_T1, _T2> > 516{ 517public: 518 typedef _T1 type; 519}; 520 521template <class _T1, class _T2> 522class _LIBCPP_TYPE_VIS_ONLY tuple_element<1, pair<_T1, _T2> > 523{ 524public: 525 typedef _T2 type; 526}; 527 528template <class _T1, class _T2> 529class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, const pair<_T1, _T2> > 530{ 531public: 532 typedef const _T1 type; 533}; 534 535template <class _T1, class _T2> 536class _LIBCPP_TYPE_VIS_ONLY tuple_element<1, const pair<_T1, _T2> > 537{ 538public: 539 typedef const _T2 type; 540}; 541 542template <size_t _Ip> struct __get_pair; 543 544template <> 545struct __get_pair<0> 546{ 547 template <class _T1, class _T2> 548 static 549 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 550 _T1& 551 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;} 552 553 template <class _T1, class _T2> 554 static 555 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 556 const _T1& 557 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;} 558 559#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 560 561 template <class _T1, class _T2> 562 static 563 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 564 _T1&& 565 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T1>(__p.first);} 566 567#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 568}; 569 570template <> 571struct __get_pair<1> 572{ 573 template <class _T1, class _T2> 574 static 575 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 576 _T2& 577 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;} 578 579 template <class _T1, class _T2> 580 static 581 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 582 const _T2& 583 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;} 584 585#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 586 587 template <class _T1, class _T2> 588 static 589 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 590 _T2&& 591 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T2>(__p.second);} 592 593#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 594}; 595 596template <size_t _Ip, class _T1, class _T2> 597inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 598typename tuple_element<_Ip, pair<_T1, _T2> >::type& 599get(pair<_T1, _T2>& __p) _NOEXCEPT 600{ 601 return __get_pair<_Ip>::get(__p); 602} 603 604template <size_t _Ip, class _T1, class _T2> 605inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 606const typename tuple_element<_Ip, pair<_T1, _T2> >::type& 607get(const pair<_T1, _T2>& __p) _NOEXCEPT 608{ 609 return __get_pair<_Ip>::get(__p); 610} 611 612#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 613 614template <size_t _Ip, class _T1, class _T2> 615inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 616typename tuple_element<_Ip, pair<_T1, _T2> >::type&& 617get(pair<_T1, _T2>&& __p) _NOEXCEPT 618{ 619 return __get_pair<_Ip>::get(_VSTD::move(__p)); 620} 621 622#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 623 624#if _LIBCPP_STD_VER > 11 625template <class _T1, class _T2> 626inline _LIBCPP_INLINE_VISIBILITY 627constexpr _T1 & get(pair<_T1, _T2>& __p) _NOEXCEPT 628{ 629 return __get_pair<0>::get(__p); 630} 631 632template <class _T1, class _T2> 633inline _LIBCPP_INLINE_VISIBILITY 634constexpr _T1 const & get(pair<_T1, _T2> const& __p) _NOEXCEPT 635{ 636 return __get_pair<0>::get(__p); 637} 638 639template <class _T1, class _T2> 640inline _LIBCPP_INLINE_VISIBILITY 641constexpr _T1 && get(pair<_T1, _T2>&& __p) _NOEXCEPT 642{ 643 return __get_pair<0>::get(_VSTD::move(__p)); 644} 645 646template <class _T1, class _T2> 647inline _LIBCPP_INLINE_VISIBILITY 648constexpr _T1 & get(pair<_T2, _T1>& __p) _NOEXCEPT 649{ 650 return __get_pair<1>::get(__p); 651} 652 653template <class _T1, class _T2> 654inline _LIBCPP_INLINE_VISIBILITY 655constexpr _T1 const & get(pair<_T2, _T1> const& __p) _NOEXCEPT 656{ 657 return __get_pair<1>::get(__p); 658} 659 660template <class _T1, class _T2> 661inline _LIBCPP_INLINE_VISIBILITY 662constexpr _T1 && get(pair<_T2, _T1>&& __p) _NOEXCEPT 663{ 664 return __get_pair<1>::get(_VSTD::move(__p)); 665} 666 667#endif 668 669#if _LIBCPP_STD_VER > 11 670 671template<class _Tp, _Tp... _Ip> 672struct _LIBCPP_TYPE_VIS_ONLY integer_sequence 673{ 674 typedef _Tp value_type; 675 static_assert( is_integral<_Tp>::value, 676 "std::integer_sequence can only be instantiated with an integral type" ); 677 static 678 _LIBCPP_INLINE_VISIBILITY 679 constexpr 680 size_t 681 size() noexcept { return sizeof...(_Ip); } 682}; 683 684template<size_t... _Ip> 685 using index_sequence = integer_sequence<size_t, _Ip...>; 686 687namespace __detail { 688 689template<typename _Tp, size_t ..._Extra> struct __repeat; 690template<typename _Tp, _Tp ..._Np, size_t ..._Extra> struct __repeat<integer_sequence<_Tp, _Np...>, _Extra...> { 691 typedef integer_sequence<_Tp, 692 _Np..., 693 sizeof...(_Np) + _Np..., 694 2 * sizeof...(_Np) + _Np..., 695 3 * sizeof...(_Np) + _Np..., 696 4 * sizeof...(_Np) + _Np..., 697 5 * sizeof...(_Np) + _Np..., 698 6 * sizeof...(_Np) + _Np..., 699 7 * sizeof...(_Np) + _Np..., 700 _Extra...> type; 701}; 702 703template<size_t _Np> struct __parity; 704template<size_t _Np> struct __make : __parity<_Np % 8>::template __pmake<_Np> {}; 705 706template<> struct __make<0> { typedef integer_sequence<size_t> type; }; 707template<> struct __make<1> { typedef integer_sequence<size_t, 0> type; }; 708template<> struct __make<2> { typedef integer_sequence<size_t, 0, 1> type; }; 709template<> struct __make<3> { typedef integer_sequence<size_t, 0, 1, 2> type; }; 710template<> struct __make<4> { typedef integer_sequence<size_t, 0, 1, 2, 3> type; }; 711template<> struct __make<5> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4> type; }; 712template<> struct __make<6> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4, 5> type; }; 713template<> struct __make<7> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4, 5, 6> type; }; 714 715template<> struct __parity<0> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type> {}; }; 716template<> struct __parity<1> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 1> {}; }; 717template<> struct __parity<2> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 2, _Np - 1> {}; }; 718template<> struct __parity<3> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 3, _Np - 2, _Np - 1> {}; }; 719template<> struct __parity<4> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; }; 720template<> 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> {}; }; 721template<> 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> {}; }; 722template<> 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> {}; }; 723 724template<typename _Tp, typename _Up> struct __convert { 725 template<typename> struct __result; 726 template<_Tp ..._Np> struct __result<integer_sequence<_Tp, _Np...> > { typedef integer_sequence<_Up, _Np...> type; }; 727}; 728template<typename _Tp> struct __convert<_Tp, _Tp> { template<typename _Up> struct __result { typedef _Up type; }; }; 729 730} 731 732template<typename _Tp, _Tp _Np> using __make_integer_sequence_unchecked = 733 typename __detail::__convert<size_t, _Tp>::template __result<typename __detail::__make<_Np>::type>::type; 734 735template <class _Tp, _Tp _Ep> 736struct __make_integer_sequence 737{ 738 static_assert(is_integral<_Tp>::value, 739 "std::make_integer_sequence can only be instantiated with an integral type" ); 740 static_assert(0 <= _Ep, "std::make_integer_sequence input shall not be negative"); 741 typedef __make_integer_sequence_unchecked<_Tp, _Ep> type; 742}; 743 744template<class _Tp, _Tp _Np> 745 using make_integer_sequence = typename __make_integer_sequence<_Tp, _Np>::type; 746 747template<size_t _Np> 748 using make_index_sequence = make_integer_sequence<size_t, _Np>; 749 750template<class... _Tp> 751 using index_sequence_for = make_index_sequence<sizeof...(_Tp)>; 752 753#endif // _LIBCPP_STD_VER > 11 754 755#if _LIBCPP_STD_VER > 11 756template<class _T1, class _T2 = _T1> 757inline _LIBCPP_INLINE_VISIBILITY 758_T1 exchange(_T1& __obj, _T2 && __new_value) 759{ 760 _T1 __old_value = _VSTD::move(__obj); 761 __obj = _VSTD::forward<_T2>(__new_value); 762 return __old_value; 763} 764#endif // _LIBCPP_STD_VER > 11 765 766_LIBCPP_END_NAMESPACE_STD 767 768#endif // _LIBCPP_UTILITY 769