libcxx/include/__algorithm/ranges_lexicographical_compare.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_LEXICOGRAPHICAL_COMPARE_H
  10 #define _LIBCPP___ALGORITHM_RANGES_LEXICOGRAPHICAL_COMPARE_H
  11
  12 #include <__algorithm/lexicographical_compare.h>
  13 #include <__algorithm/unwrap_range.h>
  14 #include <__config>
  15 #include <__functional/identity.h>
  16 #include <__functional/invoke.h>
  17 #include <__functional/ranges_operations.h>
  18 #include <__iterator/concepts.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 __lexicographical_compare {
  37   template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Proj1, class _Proj2, class _Comp>
  38   static _LIBCPP_HIDE_FROM_ABI constexpr bool __lexicographical_compare_unwrap(
  39       _Iter1 __first1,
  40       _Sent1 __last1,
  41       _Iter2 __first2,
  42       _Sent2 __last2,
  43       _Comp& __comp,
  44       _Proj1& __proj1,
  45       _Proj2& __proj2) {
  46     auto [__first1_un, __last1_un] = std::__unwrap_range(std::move(__first1), std::move(__last1));
  47     auto [__first2_un, __last2_un] = std::__unwrap_range(std::move(__first2), std::move(__last2));
  48     return std::__lexicographical_compare(
  49         std::move(__first1_un),
  50         std::move(__last1_un),
  51         std::move(__first2_un),
  52         std::move(__last2_un),
  53         __comp,
  54         __proj1,
  55         __proj2);
  56   }
  57
  58   template <input_iterator _Iter1,
  59             sentinel_for<_Iter1> _Sent1,
  60             input_iterator _Iter2,
  61             sentinel_for<_Iter2> _Sent2,
  62             class _Proj1                                                                           = identity,
  63             class _Proj2                                                                           = identity,
  64             indirect_strict_weak_order<projected<_Iter1, _Proj1>, projected<_Iter2, _Proj2>> _Comp = ranges::less>
  65   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
  66       _Iter1 __first1,
  67       _Sent1 __last1,
  68       _Iter2 __first2,
  69       _Sent2 __last2,
  70       _Comp __comp   = {},
  71       _Proj1 __proj1 = {},
  72       _Proj2 __proj2 = {}) const {
  73     return __lexicographical_compare_unwrap(
  74         std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __comp, __proj1, __proj2);
  75   }
  76
  77   template <input_range _Range1,
  78             input_range _Range2,
  79             class _Proj1 = identity,
  80             class _Proj2 = identity,
  81             indirect_strict_weak_order<projected<iterator_t<_Range1>, _Proj1>, projected<iterator_t<_Range2>, _Proj2>>
  82                 _Comp = ranges::less>
  83   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
  84       _Range1&& __range1, _Range2&& __range2, _Comp __comp = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const {
  85     return __lexicographical_compare_unwrap(
  86         ranges::begin(__range1),
  87         ranges::end(__range1),
  88         ranges::begin(__range2),
  89         ranges::end(__range2),
  90         __comp,
  91         __proj1,
  92         __proj2);
  93   }
  94 };
  95
  96 inline namespace __cpo {
  97 inline constexpr auto lexicographical_compare = __lexicographical_compare{};
  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_LEXICOGRAPHICAL_COMPARE_H