libcxx/include/__cxx03/__algorithm/ranges_is_permutation.h

   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_IS_PERMUTATION_H
  10 #define _LIBCPP___ALGORITHM_RANGES_IS_PERMUTATION_H
  11
  12 #include <__cxx03/__algorithm/is_permutation.h>
  13 #include <__cxx03/__algorithm/iterator_operations.h>
  14 #include <__cxx03/__config>
  15 #include <__cxx03/__functional/identity.h>
  16 #include <__cxx03/__functional/ranges_operations.h>
  17 #include <__cxx03/__iterator/concepts.h>
  18 #include <__cxx03/__iterator/distance.h>
  19 #include <__cxx03/__iterator/projected.h>
  20 #include <__cxx03/__ranges/access.h>
  21 #include <__cxx03/__ranges/concepts.h>
  22 #include <__cxx03/__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 <__cxx03/__undef_macros>
  30
  31 #if _LIBCPP_STD_VER >= 20
  32
  33 _LIBCPP_BEGIN_NAMESPACE_STD
  34
  35 namespace ranges {
  36 namespace __is_permutation {
  37 struct __fn {
  38   template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Proj1, class _Proj2, class _Pred>
  39   _LIBCPP_HIDE_FROM_ABI constexpr static bool __is_permutation_func_impl(
  40       _Iter1 __first1,
  41       _Sent1 __last1,
  42       _Iter2 __first2,
  43       _Sent2 __last2,
  44       _Pred& __pred,
  45       _Proj1& __proj1,
  46       _Proj2& __proj2) {
  47     return std::__is_permutation<_RangeAlgPolicy>(
  48         std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __pred, __proj1, __proj2);
  49   }
  50
  51   template <
  52       forward_iterator _Iter1,
  53       sentinel_for<_Iter1> _Sent1,
  54       forward_iterator _Iter2,
  55       sentinel_for<_Iter2> _Sent2,
  56       class _Proj1                                                                              = identity,
  57       class _Proj2                                                                              = identity,
  58       indirect_equivalence_relation<projected<_Iter1, _Proj1>, projected<_Iter2, _Proj2>> _Pred = ranges::equal_to>
  59   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
  60       _Iter1 __first1,
  61       _Sent1 __last1,
  62       _Iter2 __first2,
  63       _Sent2 __last2,
  64       _Pred __pred   = {},
  65       _Proj1 __proj1 = {},
  66       _Proj2 __proj2 = {}) const {
  67     return __is_permutation_func_impl(
  68         std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __pred, __proj1, __proj2);
  69   }
  70
  71   template <forward_range _Range1,
  72             forward_range _Range2,
  73             class _Proj1                                                                = identity,
  74             class _Proj2                                                                = identity,
  75             indirect_equivalence_relation<projected<iterator_t<_Range1>, _Proj1>,
  76                                           projected<iterator_t<_Range2>, _Proj2>> _Pred = ranges::equal_to>
  77   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
  78       _Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const {
  79     if constexpr (sized_range<_Range1> && sized_range<_Range2>) {
  80       if (ranges::distance(__range1) != ranges::distance(__range2))
  81         return false;
  82     }
  83
  84     return __is_permutation_func_impl(
  85         ranges::begin(__range1),
  86         ranges::end(__range1),
  87         ranges::begin(__range2),
  88         ranges::end(__range2),
  89         __pred,
  90         __proj1,
  91         __proj2);
  92   }
  93 };
  94 } // namespace __is_permutation
  95
  96 inline namespace __cpo {
  97 inline constexpr auto is_permutation = __is_permutation::__fn{};
  98 } // namespace __cpo
  99 } // namespace ranges
 100
 101 _LIBCPP_END_NAMESPACE_STD
 102
 103 #endif // _LIBCPP_STD_VER >= 20
 104
 105 _LIBCPP_POP_MACROS
 106
 107 #endif // _LIBCPP___ALGORITHM_RANGES_IS_PERMUTATION_H