__cxx03/__algorithm/ranges_is_permutation.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___CXX03___ALGORITHM_RANGES_IS_PERMUTATION_H
0010 #define _LIBCPP___CXX03___ALGORITHM_RANGES_IS_PERMUTATION_H
0011
0012 #include <__cxx03/__algorithm/is_permutation.h>
0013 #include <__cxx03/__algorithm/iterator_operations.h>
0014 #include <__cxx03/__config>
0015 #include <__cxx03/__functional/identity.h>
0016 #include <__cxx03/__functional/ranges_operations.h>
0017 #include <__cxx03/__iterator/concepts.h>
0018 #include <__cxx03/__iterator/distance.h>
0019 #include <__cxx03/__iterator/projected.h>
0020 #include <__cxx03/__ranges/access.h>
0021 #include <__cxx03/__ranges/concepts.h>
0022 #include <__cxx03/__utility/move.h>
0023
0024 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0025 #  pragma GCC system_header
0026 #endif
0027
0028 _LIBCPP_PUSH_MACROS
0029 #include <__cxx03/__undef_macros>
0030
0031 #if _LIBCPP_STD_VER >= 20
0032
0033 _LIBCPP_BEGIN_NAMESPACE_STD
0034
0035 namespace ranges {
0036 namespace __is_permutation {
0037 struct __fn {
0038   template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Proj1, class _Proj2, class _Pred>
0039   _LIBCPP_HIDE_FROM_ABI constexpr static bool __is_permutation_func_impl(
0040       _Iter1 __first1,
0041       _Sent1 __last1,
0042       _Iter2 __first2,
0043       _Sent2 __last2,
0044       _Pred& __pred,
0045       _Proj1& __proj1,
0046       _Proj2& __proj2) {
0047     return std::__is_permutation<_RangeAlgPolicy>(
0048         std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __pred, __proj1, __proj2);
0049   }
0050
0051   template <
0052       forward_iterator _Iter1,
0053       sentinel_for<_Iter1> _Sent1,
0054       forward_iterator _Iter2,
0055       sentinel_for<_Iter2> _Sent2,
0056       class _Proj1                                                                              = identity,
0057       class _Proj2                                                                              = identity,
0058       indirect_equivalence_relation<projected<_Iter1, _Proj1>, projected<_Iter2, _Proj2>> _Pred = ranges::equal_to>
0059   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
0060       _Iter1 __first1,
0061       _Sent1 __last1,
0062       _Iter2 __first2,
0063       _Sent2 __last2,
0064       _Pred __pred   = {},
0065       _Proj1 __proj1 = {},
0066       _Proj2 __proj2 = {}) const {
0067     return __is_permutation_func_impl(
0068         std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __pred, __proj1, __proj2);
0069   }
0070
0071   template <forward_range _Range1,
0072             forward_range _Range2,
0073             class _Proj1                                                                = identity,
0074             class _Proj2                                                                = identity,
0075             indirect_equivalence_relation<projected<iterator_t<_Range1>, _Proj1>,
0076                                           projected<iterator_t<_Range2>, _Proj2>> _Pred = ranges::equal_to>
0077   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
0078       _Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const {
0079     if constexpr (sized_range<_Range1> && sized_range<_Range2>) {
0080       if (ranges::distance(__range1) != ranges::distance(__range2))
0081         return false;
0082     }
0083
0084     return __is_permutation_func_impl(
0085         ranges::begin(__range1),
0086         ranges::end(__range1),
0087         ranges::begin(__range2),
0088         ranges::end(__range2),
0089         __pred,
0090         __proj1,
0091         __proj2);
0092   }
0093 };
0094 } // namespace __is_permutation
0095
0096 inline namespace __cpo {
0097 inline constexpr auto is_permutation = __is_permutation::__fn{};
0098 } // namespace __cpo
0099 } // namespace ranges
0100
0101 _LIBCPP_END_NAMESPACE_STD
0102
0103 #endif // _LIBCPP_STD_VER >= 20
0104
0105 _LIBCPP_POP_MACROS
0106
0107 #endif // _LIBCPP___CXX03___ALGORITHM_RANGES_IS_PERMUTATION_H