1*4bdff4beSrobert //===----------------------------------------------------------------------===// 2*4bdff4beSrobert // 3*4bdff4beSrobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*4bdff4beSrobert // See https://llvm.org/LICENSE.txt for license information. 5*4bdff4beSrobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*4bdff4beSrobert // 7*4bdff4beSrobert //===----------------------------------------------------------------------===// 8*4bdff4beSrobert 9*4bdff4beSrobert #ifndef _LIBCPP___ALGORITHM_RANGES_EQUAL_H 10*4bdff4beSrobert #define _LIBCPP___ALGORITHM_RANGES_EQUAL_H 11*4bdff4beSrobert 12*4bdff4beSrobert #include <__config> 13*4bdff4beSrobert #include <__functional/identity.h> 14*4bdff4beSrobert #include <__functional/invoke.h> 15*4bdff4beSrobert #include <__functional/ranges_operations.h> 16*4bdff4beSrobert #include <__iterator/concepts.h> 17*4bdff4beSrobert #include <__iterator/distance.h> 18*4bdff4beSrobert #include <__iterator/indirectly_comparable.h> 19*4bdff4beSrobert #include <__ranges/access.h> 20*4bdff4beSrobert #include <__ranges/concepts.h> 21*4bdff4beSrobert #include <__utility/move.h> 22*4bdff4beSrobert 23*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 24*4bdff4beSrobert # pragma GCC system_header 25*4bdff4beSrobert #endif 26*4bdff4beSrobert 27*4bdff4beSrobert #if _LIBCPP_STD_VER > 17 28*4bdff4beSrobert 29*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD 30*4bdff4beSrobert 31*4bdff4beSrobert namespace ranges { 32*4bdff4beSrobert namespace __equal { 33*4bdff4beSrobert struct __fn { 34*4bdff4beSrobert private: 35*4bdff4beSrobert template <class _Iter1, class _Sent1, 36*4bdff4beSrobert class _Iter2, class _Sent2, 37*4bdff4beSrobert class _Pred, 38*4bdff4beSrobert class _Proj1, 39*4bdff4beSrobert class _Proj2> 40*4bdff4beSrobert _LIBCPP_HIDE_FROM_ABI constexpr static __equal_impl__fn41*4bdff4beSrobert bool __equal_impl(_Iter1 __first1, _Sent1 __last1, 42*4bdff4beSrobert _Iter2 __first2, _Sent2 __last2, 43*4bdff4beSrobert _Pred& __pred, 44*4bdff4beSrobert _Proj1& __proj1, 45*4bdff4beSrobert _Proj2& __proj2) { 46*4bdff4beSrobert while (__first1 != __last1 && __first2 != __last2) { 47*4bdff4beSrobert if (!std::invoke(__pred, std::invoke(__proj1, *__first1), std::invoke(__proj2, *__first2))) 48*4bdff4beSrobert return false; 49*4bdff4beSrobert ++__first1; 50*4bdff4beSrobert ++__first2; 51*4bdff4beSrobert } 52*4bdff4beSrobert return __first1 == __last1 && __first2 == __last2; 53*4bdff4beSrobert } 54*4bdff4beSrobert 55*4bdff4beSrobert public: 56*4bdff4beSrobert 57*4bdff4beSrobert template <input_iterator _Iter1, sentinel_for<_Iter1> _Sent1, 58*4bdff4beSrobert input_iterator _Iter2, sentinel_for<_Iter2> _Sent2, 59*4bdff4beSrobert class _Pred = ranges::equal_to, 60*4bdff4beSrobert class _Proj1 = identity, 61*4bdff4beSrobert class _Proj2 = identity> 62*4bdff4beSrobert requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2> 63*4bdff4beSrobert _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr operator__fn64*4bdff4beSrobert bool operator()(_Iter1 __first1, _Sent1 __last1, 65*4bdff4beSrobert _Iter2 __first2, _Sent2 __last2, 66*4bdff4beSrobert _Pred __pred = {}, 67*4bdff4beSrobert _Proj1 __proj1 = {}, 68*4bdff4beSrobert _Proj2 __proj2 = {}) const { 69*4bdff4beSrobert if constexpr (sized_sentinel_for<_Sent1, _Iter1> && sized_sentinel_for<_Sent2, _Iter2>) { 70*4bdff4beSrobert if (__last1 - __first1 != __last2 - __first2) 71*4bdff4beSrobert return false; 72*4bdff4beSrobert } 73*4bdff4beSrobert return __equal_impl(std::move(__first1), std::move(__last1), 74*4bdff4beSrobert std::move(__first2), std::move(__last2), 75*4bdff4beSrobert __pred, 76*4bdff4beSrobert __proj1, 77*4bdff4beSrobert __proj2); 78*4bdff4beSrobert } 79*4bdff4beSrobert 80*4bdff4beSrobert template <input_range _Range1, 81*4bdff4beSrobert input_range _Range2, 82*4bdff4beSrobert class _Pred = ranges::equal_to, 83*4bdff4beSrobert class _Proj1 = identity, 84*4bdff4beSrobert class _Proj2 = identity> 85*4bdff4beSrobert requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2> 86*4bdff4beSrobert _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr operator__fn87*4bdff4beSrobert bool operator()(_Range1&& __range1, 88*4bdff4beSrobert _Range2&& __range2, 89*4bdff4beSrobert _Pred __pred = {}, 90*4bdff4beSrobert _Proj1 __proj1 = {}, 91*4bdff4beSrobert _Proj2 __proj2 = {}) const { 92*4bdff4beSrobert if constexpr (sized_range<_Range1> && sized_range<_Range2>) { 93*4bdff4beSrobert if (ranges::distance(__range1) != ranges::distance(__range2)) 94*4bdff4beSrobert return false; 95*4bdff4beSrobert } 96*4bdff4beSrobert return __equal_impl(ranges::begin(__range1), ranges::end(__range1), 97*4bdff4beSrobert ranges::begin(__range2), ranges::end(__range2), 98*4bdff4beSrobert __pred, 99*4bdff4beSrobert __proj1, 100*4bdff4beSrobert __proj2); 101*4bdff4beSrobert return false; 102*4bdff4beSrobert } 103*4bdff4beSrobert }; 104*4bdff4beSrobert } // namespace __equal 105*4bdff4beSrobert 106*4bdff4beSrobert inline namespace __cpo { 107*4bdff4beSrobert inline constexpr auto equal = __equal::__fn{}; 108*4bdff4beSrobert } // namespace __cpo 109*4bdff4beSrobert } // namespace ranges 110*4bdff4beSrobert 111*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD 112*4bdff4beSrobert 113*4bdff4beSrobert #endif // _LIBCPP_STD_VER > 17 114*4bdff4beSrobert 115*4bdff4beSrobert #endif // _LIBCPP___ALGORITHM_RANGES_EQUAL_H 116