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 #if _LIBCPP_STD_VER >= 20
  29
  30 _LIBCPP_BEGIN_NAMESPACE_STD
  31
  32 namespace ranges {
  33 namespace __is_permutation {
  34 struct __fn {
  35   template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Proj1, class _Proj2, class _Pred>
  36   _LIBCPP_HIDE_FROM_ABI constexpr static bool __is_permutation_func_impl(
  37       _Iter1 __first1,
  38       _Sent1 __last1,
  39       _Iter2 __first2,
  40       _Sent2 __last2,
  41       _Pred& __pred,
  42       _Proj1& __proj1,
  43       _Proj2& __proj2) {
  44     return std::__is_permutation<_RangeAlgPolicy>(
  45         std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __pred, __proj1, __proj2);
  46   }
  47
  48   template <
  49       forward_iterator _Iter1,
  50       sentinel_for<_Iter1> _Sent1,
  51       forward_iterator _Iter2,
  52       sentinel_for<_Iter2> _Sent2,
  53       class _Proj1                                                                              = identity,
  54       class _Proj2                                                                              = identity,
  55       indirect_equivalence_relation<projected<_Iter1, _Proj1>, projected<_Iter2, _Proj2>> _Pred = ranges::equal_to>
  56   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
  57       _Iter1 __first1,
  58       _Sent1 __last1,
  59       _Iter2 __first2,
  60       _Sent2 __last2,
  61       _Pred __pred   = {},
  62       _Proj1 __proj1 = {},
  63       _Proj2 __proj2 = {}) const {
  64     return __is_permutation_func_impl(
  65         std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __pred, __proj1, __proj2);
  66   }
  67
  68   template <forward_range _Range1,
  69             forward_range _Range2,
  70             class _Proj1                                                                = identity,
  71             class _Proj2                                                                = identity,
  72             indirect_equivalence_relation<projected<iterator_t<_Range1>, _Proj1>,
  73                                           projected<iterator_t<_Range2>, _Proj2>> _Pred = ranges::equal_to>
  74   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
  75       _Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const {
  76     if constexpr (sized_range<_Range1> && sized_range<_Range2>) {
  77       if (ranges::distance(__range1) != ranges::distance(__range2))
  78         return false;
  79     }
  80
  81     return __is_permutation_func_impl(
  82         ranges::begin(__range1),
  83         ranges::end(__range1),
  84         ranges::begin(__range2),
  85         ranges::end(__range2),
  86         __pred,
  87         __proj1,
  88         __proj2);
  89   }
  90 };
  91 } // namespace __is_permutation
  92
  93 inline namespace __cpo {
  94 inline constexpr auto is_permutation = __is_permutation::__fn{};
  95 } // namespace __cpo
  96 } // namespace ranges
  97
  98 _LIBCPP_END_NAMESPACE_STD
  99
 100 #endif // _LIBCPP_STD_VER >= 20
 101
 102 #endif // _LIBCPP___ALGORITHM_RANGES_IS_PERMUTATION_H