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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-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef _LIBCPP___ALGORITHM_RANGES_CLAMP_H10#define _LIBCPP___ALGORITHM_RANGES_CLAMP_H11 12#include <__assert>13#include <__config>14#include <__functional/identity.h>15#include <__functional/invoke.h>16#include <__functional/ranges_operations.h>17#include <__iterator/concepts.h>18#include <__iterator/projected.h>19#include <__utility/forward.h>20 21#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)22# pragma GCC system_header23#endif24 25_LIBCPP_PUSH_MACROS26#include <__undef_macros>27 28#if _LIBCPP_STD_VER >= 2029 30_LIBCPP_BEGIN_NAMESPACE_STD31 32namespace ranges {33struct __clamp {34 template <class _Type,35 class _Proj = identity,36 indirect_strict_weak_order<projected<const _Type*, _Proj>> _Comp = ranges::less>37 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr const _Type& operator()(38 const _Type& __value, const _Type& __low, const _Type& __high, _Comp __comp = {}, _Proj __proj = {}) const {39 _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(40 !bool(std::invoke(__comp, std::invoke(__proj, __high), std::invoke(__proj, __low))),41 "Bad bounds passed to std::ranges::clamp");42 43 auto&& __projected = std::invoke(__proj, __value);44 if (std::invoke(__comp, std::forward<decltype(__projected)>(__projected), std::invoke(__proj, __low)))45 return __low;46 else if (std::invoke(__comp, std::invoke(__proj, __high), std::forward<decltype(__projected)>(__projected)))47 return __high;48 else49 return __value;50 }51};52 53inline namespace __cpo {54inline constexpr auto clamp = __clamp{};55} // namespace __cpo56} // namespace ranges57 58_LIBCPP_END_NAMESPACE_STD59 60#endif // _LIBCPP_STD_VER >= 2061 62_LIBCPP_POP_MACROS63 64#endif // _LIBCPP___ALGORITHM_RANGES_CLAMP_H65