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_BEGIN_NAMESPACE_STD 29 30 #if _LIBCPP_STD_VER > 17 31 32 namespace ranges { 33 34 template <class _I1, class _I2> 35 using mismatch_result = in_in_result<_I1, _I2>; 36 37 namespace __mismatch { 38 struct __fn { 39 template <class _I1, class _S1, class _I2, class _S2, 40 class _Pred, class _Proj1, class _Proj2> 41 static _LIBCPP_HIDE_FROM_ABI constexpr 42 mismatch_result<_I1, _I2> 43 __go(_I1 __first1, _S1 __last1, _I2 __first2, _S2 __last2, 44 _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, sentinel_for<_I1> _S1, 55 input_iterator _I2, sentinel_for<_I2> _S2, 56 class _Pred = ranges::equal_to, class _Proj1 = identity, class _Proj2 = identity> 57 requires indirectly_comparable<_I1, _I2, _Pred, _Proj1, _Proj2> 58 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr 59 mismatch_result<_I1, _I2> operator()(_I1 __first1, _S1 __last1, _I2 __first2, _S2 __last2, 60 _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const { 61 return __go(std::move(__first1), __last1, std::move(__first2), __last2, __pred, __proj1, __proj2); 62 } 63 64 template <input_range _R1, input_range _R2, 65 class _Pred = ranges::equal_to, class _Proj1 = identity, class _Proj2 = identity> 66 requires indirectly_comparable<iterator_t<_R1>, iterator_t<_R2>, _Pred, _Proj1, _Proj2> 67 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr 68 mismatch_result<borrowed_iterator_t<_R1>, borrowed_iterator_t<_R2>> 69 operator()(_R1&& __r1, _R2&& __r2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const { 70 return __go(ranges::begin(__r1), ranges::end(__r1), ranges::begin(__r2), ranges::end(__r2), 71 __pred, __proj1, __proj2); 72 } 73 }; 74 } // namespace __mismatch 75 76 inline namespace __cpo { 77 constexpr inline auto mismatch = __mismatch::__fn{}; 78 } // namespace __cpo 79 } // namespace ranges 80 81 #endif // _LIBCPP_STD_VER > 17 82 83 _LIBCPP_END_NAMESPACE_STD 84 85 #endif // _LIBCPP___ALGORITHM_RANGES_MISMATCH_H 86