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