v1/__algorithm/ranges_mismatch.h

0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef _LIBCPP___ALGORITHM_RANGES_MISMATCH_H
0010 #define _LIBCPP___ALGORITHM_RANGES_MISMATCH_H
0011
0012 #include <__algorithm/in_in_result.h>
0013 #include <__algorithm/mismatch.h>
0014 #include <__algorithm/unwrap_range.h>
0015 #include <__config>
0016 #include <__functional/identity.h>
0017 #include <__functional/invoke.h>
0018 #include <__functional/ranges_operations.h>
0019 #include <__iterator/concepts.h>
0020 #include <__iterator/indirectly_comparable.h>
0021 #include <__ranges/access.h>
0022 #include <__ranges/concepts.h>
0023 #include <__ranges/dangling.h>
0024 #include <__utility/move.h>
0025
0026 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0027 #  pragma GCC system_header
0028 #endif
0029
0030 _LIBCPP_PUSH_MACROS
0031 #include <__undef_macros>
0032
0033 _LIBCPP_BEGIN_NAMESPACE_STD
0034
0035 #if _LIBCPP_STD_VER >= 20
0036
0037 namespace ranges {
0038
0039 template <class _I1, class _I2>
0040 using mismatch_result = in_in_result<_I1, _I2>;
0041
0042 struct __mismatch {
0043   template <class _I1, class _S1, class _I2, class _S2, class _Pred, class _Proj1, class _Proj2>
0044   static _LIBCPP_HIDE_FROM_ABI constexpr mismatch_result<_I1, _I2>
0045   __go(_I1 __first1, _S1 __last1, _I2 __first2, _S2 __last2, _Pred& __pred, _Proj1& __proj1, _Proj2& __proj2) {
0046     if constexpr (forward_iterator<_I1> && forward_iterator<_I2>) {
0047       auto __range1 = std::__unwrap_range(__first1, __last1);
0048       auto __range2 = std::__unwrap_range(__first2, __last2);
0049       auto __res =
0050           std::__mismatch(__range1.first, __range1.second, __range2.first, __range2.second, __pred, __proj1, __proj2);
0051       return {std::__rewrap_range<_S1>(__first1, __res.first), std::__rewrap_range<_S2>(__first2, __res.second)};
0052     } else {
0053       auto __res = std::__mismatch(
0054           std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __pred, __proj1, __proj2);
0055       return {std::move(__res.first), std::move(__res.second)};
0056     }
0057   }
0058
0059   template <input_iterator _I1,
0060             sentinel_for<_I1> _S1,
0061             input_iterator _I2,
0062             sentinel_for<_I2> _S2,
0063             class _Pred  = ranges::equal_to,
0064             class _Proj1 = identity,
0065             class _Proj2 = identity>
0066     requires indirectly_comparable<_I1, _I2, _Pred, _Proj1, _Proj2>
0067   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr mismatch_result<_I1, _I2> operator()(
0068       _I1 __first1, _S1 __last1, _I2 __first2, _S2 __last2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {})
0069       const {
0070     return __go(std::move(__first1), __last1, std::move(__first2), __last2, __pred, __proj1, __proj2);
0071   }
0072
0073   template <input_range _R1,
0074             input_range _R2,
0075             class _Pred  = ranges::equal_to,
0076             class _Proj1 = identity,
0077             class _Proj2 = identity>
0078     requires indirectly_comparable<iterator_t<_R1>, iterator_t<_R2>, _Pred, _Proj1, _Proj2>
0079   [[nodiscard]]
0080   _LIBCPP_HIDE_FROM_ABI constexpr mismatch_result<borrowed_iterator_t<_R1>, borrowed_iterator_t<_R2>>
0081   operator()(_R1&& __r1, _R2&& __r2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const {
0082     return __go(
0083         ranges::begin(__r1), ranges::end(__r1), ranges::begin(__r2), ranges::end(__r2), __pred, __proj1, __proj2);
0084   }
0085 };
0086
0087 inline namespace __cpo {
0088 constexpr inline auto mismatch = __mismatch{};
0089 } // namespace __cpo
0090 } // namespace ranges
0091
0092 #endif // _LIBCPP_STD_VER >= 20
0093
0094 _LIBCPP_END_NAMESPACE_STD
0095
0096 _LIBCPP_POP_MACROS
0097
0098 #endif // _LIBCPP___ALGORITHM_RANGES_MISMATCH_H