1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef _LIBCPP___ALGORITHM_RANGES_EQUAL_H 10 #define _LIBCPP___ALGORITHM_RANGES_EQUAL_H 11 12 #include <__algorithm/equal.h> 13 #include <__algorithm/unwrap_range.h> 14 #include <__config> 15 #include <__functional/identity.h> 16 #include <__functional/invoke.h> 17 #include <__functional/ranges_operations.h> 18 #include <__iterator/concepts.h> 19 #include <__iterator/distance.h> 20 #include <__iterator/indirectly_comparable.h> 21 #include <__ranges/access.h> 22 #include <__ranges/concepts.h> 23 #include <__utility/move.h> 24 25 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 26 # pragma GCC system_header 27 #endif 28 29 #if _LIBCPP_STD_VER >= 20 30 31 _LIBCPP_BEGIN_NAMESPACE_STD 32 33 namespace ranges { 34 namespace __equal { 35 struct __fn { 36 template <input_iterator _Iter1, 37 sentinel_for<_Iter1> _Sent1, 38 input_iterator _Iter2, 39 sentinel_for<_Iter2> _Sent2, 40 class _Pred = ranges::equal_to, 41 class _Proj1 = identity, 42 class _Proj2 = identity> 43 requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2> 44 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool operator()( 45 _Iter1 __first1, 46 _Sent1 __last1, 47 _Iter2 __first2, 48 _Sent2 __last2, 49 _Pred __pred = {}, 50 _Proj1 __proj1 = {}, 51 _Proj2 __proj2 = {}) const { 52 if constexpr (sized_sentinel_for<_Sent1, _Iter1> && sized_sentinel_for<_Sent2, _Iter2>) { 53 if (__last1 - __first1 != __last2 - __first2) 54 return false; 55 } 56 auto __unwrapped1 = std::__unwrap_range(std::move(__first1), std::move(__last1)); 57 auto __unwrapped2 = std::__unwrap_range(std::move(__first2), std::move(__last2)); 58 return std::__equal_impl( 59 std::move(__unwrapped1.first), 60 std::move(__unwrapped1.second), 61 std::move(__unwrapped2.first), 62 std::move(__unwrapped2.second), 63 __pred, 64 __proj1, 65 __proj2); 66 } 67 68 template <input_range _Range1, 69 input_range _Range2, 70 class _Pred = ranges::equal_to, 71 class _Proj1 = identity, 72 class _Proj2 = identity> 73 requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2> 74 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool operator()( 75 _Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const { 76 if constexpr (sized_range<_Range1> && sized_range<_Range2>) { 77 if (ranges::distance(__range1) != ranges::distance(__range2)) 78 return false; 79 } 80 auto __unwrapped1 = std::__unwrap_range(ranges::begin(__range1), ranges::end(__range1)); 81 auto __unwrapped2 = std::__unwrap_range(ranges::begin(__range2), ranges::end(__range2)); 82 return std::__equal_impl( 83 std::move(__unwrapped1.first), 84 std::move(__unwrapped1.second), 85 std::move(__unwrapped2.first), 86 std::move(__unwrapped2.second), 87 __pred, 88 __proj1, 89 __proj2); 90 return false; 91 } 92 }; 93 } // namespace __equal 94 95 inline namespace __cpo { 96 inline constexpr auto equal = __equal::__fn{}; 97 } // namespace __cpo 98 } // namespace ranges 99 100 _LIBCPP_END_NAMESPACE_STD 101 102 #endif // _LIBCPP_STD_VER >= 20 103 104 #endif // _LIBCPP___ALGORITHM_RANGES_EQUAL_H 105