| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___ALGORITHM_RANGES_CLAMP_H |
| #define _LIBCPP___ALGORITHM_RANGES_CLAMP_H |
| |
| #include <__assert> |
| #include <__config> |
| #include <__functional/identity.h> |
| #include <__functional/invoke.h> |
| #include <__functional/ranges_operations.h> |
| #include <__iterator/concepts.h> |
| #include <__iterator/projected.h> |
| #include <__utility/forward.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_PUSH_MACROS |
| #include <__undef_macros> |
| |
| #if _LIBCPP_STD_VER >= 20 |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| namespace ranges { |
| namespace __clamp { |
| struct __fn { |
| template <class _Type, |
| class _Proj = identity, |
| indirect_strict_weak_order<projected<const _Type*, _Proj>> _Comp = ranges::less> |
| [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr const _Type& operator()( |
| const _Type& __value, const _Type& __low, const _Type& __high, _Comp __comp = {}, _Proj __proj = {}) const { |
| _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN( |
| !bool(std::invoke(__comp, std::invoke(__proj, __high), std::invoke(__proj, __low))), |
| "Bad bounds passed to std::ranges::clamp"); |
| |
| auto&& __projected = std::invoke(__proj, __value); |
| if (std::invoke(__comp, std::forward<decltype(__projected)>(__projected), std::invoke(__proj, __low))) |
| return __low; |
| else if (std::invoke(__comp, std::invoke(__proj, __high), std::forward<decltype(__projected)>(__projected))) |
| return __high; |
| else |
| return __value; |
| } |
| }; |
| } // namespace __clamp |
| |
| inline namespace __cpo { |
| inline constexpr auto clamp = __clamp::__fn{}; |
| } // namespace __cpo |
| } // namespace ranges |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP_STD_VER >= 20 |
| |
| _LIBCPP_POP_MACROS |
| |
| #endif // _LIBCPP___ALGORITHM_RANGES_CLAMP_H |