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_MISMATCH_H 10 #define _LIBCPP___ALGORITHM_RANGES_MISMATCH_H 11 12 #include <__algorithm/in_in_result.h> 13 #include <__config> 14 #include <__functional/identity.h> 15 #include <__functional/invoke.h> 16 #include <__functional/ranges_operations.h> 17 #include <__iterator/concepts.h> 18 #include <__iterator/indirectly_comparable.h> 19 #include <__ranges/access.h> 20 #include <__ranges/concepts.h> 21 #include <__ranges/dangling.h> 22 #include <__utility/move.h> 23 24 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 25 # pragma GCC system_header 26 #endif 27 28 _LIBCPP_PUSH_MACROS 29 #include <__undef_macros> 30 31 _LIBCPP_BEGIN_NAMESPACE_STD 32 33 #if _LIBCPP_STD_VER >= 20 34 35 namespace ranges { 36 37 template <class _I1, class _I2> 38 using mismatch_result = in_in_result<_I1, _I2>; 39 40 namespace __mismatch { 41 struct __fn { 42 template <class _I1, class _S1, class _I2, class _S2, class _Pred, class _Proj1, class _Proj2> 43 static _LIBCPP_HIDE_FROM_ABI constexpr mismatch_result<_I1, _I2> 44 __go(_I1 __first1, _S1 __last1, _I2 __first2, _S2 __last2, _Pred& __pred, _Proj1& __proj1, _Proj2& __proj2) { 45 while (__first1 != __last1 && __first2 != __last2) { 46 if (!std::invoke(__pred, std::invoke(__proj1, *__first1), std::invoke(__proj2, *__first2))) 47 break; 48 ++__first1; 49 ++__first2; 50 } 51 return {std::move(__first1), std::move(__first2)}; 52 } 53 54 template <input_iterator _I1, 55 sentinel_for<_I1> _S1, 56 input_iterator _I2, 57 sentinel_for<_I2> _S2, 58 class _Pred = ranges::equal_to, 59 class _Proj1 = identity, 60 class _Proj2 = identity> 61 requires indirectly_comparable<_I1, _I2, _Pred, _Proj1, _Proj2> 62 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr mismatch_result<_I1, _I2> operator()( 63 _I1 __first1, _S1 __last1, _I2 __first2, _S2 __last2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) 64 const { 65 return __go(std::move(__first1), __last1, std::move(__first2), __last2, __pred, __proj1, __proj2); 66 } 67 68 template <input_range _R1, 69 input_range _R2, 70 class _Pred = ranges::equal_to, 71 class _Proj1 = identity, 72 class _Proj2 = identity> 73 requires indirectly_comparable<iterator_t<_R1>, iterator_t<_R2>, _Pred, _Proj1, _Proj2> 74 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr mismatch_result<borrowed_iterator_t<_R1>, 75 borrowed_iterator_t<_R2>> 76 operator()(_R1&& __r1, _R2&& __r2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const { 77 return __go( 78 ranges::begin(__r1), ranges::end(__r1), ranges::begin(__r2), ranges::end(__r2), __pred, __proj1, __proj2); 79 } 80 }; 81 } // namespace __mismatch 82 83 inline namespace __cpo { 84 constexpr inline auto mismatch = __mismatch::__fn{}; 85 } // namespace __cpo 86 } // namespace ranges 87 88 #endif // _LIBCPP_STD_VER >= 20 89 90 _LIBCPP_END_NAMESPACE_STD 91 92 _LIBCPP_POP_MACROS 93 94 #endif // _LIBCPP___ALGORITHM_RANGES_MISMATCH_H 95