libcxx/include/__algorithm/ranges_is_sorted.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_SORTED_H
  10 #define _LIBCPP__ALGORITHM_RANGES_IS_SORTED_H
  11
  12 #include <__algorithm/ranges_is_sorted_until.h>
  13 #include <__config>
  14 #include <__functional/identity.h>
  15 #include <__functional/ranges_operations.h>
  16 #include <__iterator/concepts.h>
  17 #include <__iterator/projected.h>
  18 #include <__ranges/access.h>
  19 #include <__ranges/concepts.h>
  20 #include <__utility/move.h>
  21
  22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  23 #  pragma GCC system_header
  24 #endif
  25
  26 #if _LIBCPP_STD_VER >= 20
  27
  28 _LIBCPP_BEGIN_NAMESPACE_STD
  29
  30 namespace ranges {
  31 namespace __is_sorted {
  32 struct __fn {
  33   template <forward_iterator _Iter,
  34             sentinel_for<_Iter> _Sent,
  35             class _Proj                                               = identity,
  36             indirect_strict_weak_order<projected<_Iter, _Proj>> _Comp = ranges::less>
  37   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool
  38   operator()(_Iter __first, _Sent __last, _Comp __comp = {}, _Proj __proj = {}) const {
  39     return ranges::__is_sorted_until_impl(std::move(__first), __last, __comp, __proj) == __last;
  40   }
  41
  42   template <forward_range _Range,
  43             class _Proj                                                            = identity,
  44             indirect_strict_weak_order<projected<iterator_t<_Range>, _Proj>> _Comp = ranges::less>
  45   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool
  46   operator()(_Range&& __range, _Comp __comp = {}, _Proj __proj = {}) const {
  47     auto __last = ranges::end(__range);
  48     return ranges::__is_sorted_until_impl(ranges::begin(__range), __last, __comp, __proj) == __last;
  49   }
  50 };
  51 } // namespace __is_sorted
  52
  53 inline namespace __cpo {
  54 inline constexpr auto is_sorted = __is_sorted::__fn{};
  55 } // namespace __cpo
  56 } // namespace ranges
  57
  58 _LIBCPP_END_NAMESPACE_STD
  59
  60 #endif // _LIBCPP_STD_VER >= 20
  61
  62 #endif // _LIBCPP__ALGORITHM_RANGES_IS_SORTED_H