libcxx/include/__algorithm/ranges_upper_bound.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_UPPER_BOUND_H
  10 #define _LIBCPP___ALGORITHM_RANGES_UPPER_BOUND_H
  11
  12 #include <__algorithm/iterator_operations.h>
  13 #include <__algorithm/lower_bound.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 <__ranges/dangling.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 struct __upper_bound {
  34   template <forward_iterator _Iter,
  35             sentinel_for<_Iter> _Sent,
  36             class _Type,
  37             class _Proj                                                             = identity,
  38             indirect_strict_weak_order<const _Type*, projected<_Iter, _Proj>> _Comp = ranges::less>
  39   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Iter
  40   operator()(_Iter __first, _Sent __last, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const {
  41     auto __comp_lhs_rhs_swapped = [&](const auto& __lhs, const auto& __rhs) -> bool {
  42       return !std::invoke(__comp, __rhs, __lhs);
  43     };
  44
  45     return std::__lower_bound<_RangeAlgPolicy>(__first, __last, __value, __comp_lhs_rhs_swapped, __proj);
  46   }
  47
  48   template <forward_range _Range,
  49             class _Type,
  50             class _Proj                                                                          = identity,
  51             indirect_strict_weak_order<const _Type*, projected<iterator_t<_Range>, _Proj>> _Comp = ranges::less>
  52   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range>
  53   operator()(_Range&& __r, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const {
  54     auto __comp_lhs_rhs_swapped = [&](const auto& __lhs, const auto& __rhs) -> bool {
  55       return !std::invoke(__comp, __rhs, __lhs);
  56     };
  57
  58     return std::__lower_bound<_RangeAlgPolicy>(
  59         ranges::begin(__r), ranges::end(__r), __value, __comp_lhs_rhs_swapped, __proj);
  60   }
  61 };
  62
  63 inline namespace __cpo {
  64 inline constexpr auto upper_bound = __upper_bound{};
  65 } // namespace __cpo
  66 } // namespace ranges
  67
  68 _LIBCPP_END_NAMESPACE_STD
  69
  70 #endif // _LIBCPP_STD_VER >= 20
  71
  72 #endif // _LIBCPP___ALGORITHM_RANGES_UPPER_BOUND_H