1e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 2e78f53d1SNikolas Klauser // 3e78f53d1SNikolas Klauser // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4e78f53d1SNikolas Klauser // See https://llvm.org/LICENSE.txt for license information. 5e78f53d1SNikolas Klauser // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6e78f53d1SNikolas Klauser // 7e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 8e78f53d1SNikolas Klauser 9*ce777190SNikolas Klauser #ifndef _LIBCPP___CXX03___ALGORITHM_RANGES_CLAMP_H 10*ce777190SNikolas Klauser #define _LIBCPP___CXX03___ALGORITHM_RANGES_CLAMP_H 11e78f53d1SNikolas Klauser 1273fbae83SNikolas Klauser #include <__cxx03/__assert> 1373fbae83SNikolas Klauser #include <__cxx03/__config> 1473fbae83SNikolas Klauser #include <__cxx03/__functional/identity.h> 1573fbae83SNikolas Klauser #include <__cxx03/__functional/invoke.h> 1673fbae83SNikolas Klauser #include <__cxx03/__functional/ranges_operations.h> 1773fbae83SNikolas Klauser #include <__cxx03/__iterator/concepts.h> 1873fbae83SNikolas Klauser #include <__cxx03/__iterator/projected.h> 1973fbae83SNikolas Klauser #include <__cxx03/__utility/forward.h> 20e78f53d1SNikolas Klauser 21e78f53d1SNikolas Klauser #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 22e78f53d1SNikolas Klauser # pragma GCC system_header 23e78f53d1SNikolas Klauser #endif 24e78f53d1SNikolas Klauser 25e78f53d1SNikolas Klauser _LIBCPP_PUSH_MACROS 2673fbae83SNikolas Klauser #include <__cxx03/__undef_macros> 27e78f53d1SNikolas Klauser 28e78f53d1SNikolas Klauser #if _LIBCPP_STD_VER >= 20 29e78f53d1SNikolas Klauser 30e78f53d1SNikolas Klauser _LIBCPP_BEGIN_NAMESPACE_STD 31e78f53d1SNikolas Klauser 32e78f53d1SNikolas Klauser namespace ranges { 33e78f53d1SNikolas Klauser namespace __clamp { 34e78f53d1SNikolas Klauser struct __fn { 35e78f53d1SNikolas Klauser template <class _Type, 36e78f53d1SNikolas Klauser class _Proj = identity, 37e78f53d1SNikolas Klauser indirect_strict_weak_order<projected<const _Type*, _Proj>> _Comp = ranges::less> 38e78f53d1SNikolas Klauser [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr const _Type& operator()( 39e78f53d1SNikolas Klauser const _Type& __value, const _Type& __low, const _Type& __high, _Comp __comp = {}, _Proj __proj = {}) const { 40e78f53d1SNikolas Klauser _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN( 41e78f53d1SNikolas Klauser !bool(std::invoke(__comp, std::invoke(__proj, __high), std::invoke(__proj, __low))), 42e78f53d1SNikolas Klauser "Bad bounds passed to std::ranges::clamp"); 43e78f53d1SNikolas Klauser 44e78f53d1SNikolas Klauser auto&& __projected = std::invoke(__proj, __value); 45e78f53d1SNikolas Klauser if (std::invoke(__comp, std::forward<decltype(__projected)>(__projected), std::invoke(__proj, __low))) 46e78f53d1SNikolas Klauser return __low; 47e78f53d1SNikolas Klauser else if (std::invoke(__comp, std::invoke(__proj, __high), std::forward<decltype(__projected)>(__projected))) 48e78f53d1SNikolas Klauser return __high; 49e78f53d1SNikolas Klauser else 50e78f53d1SNikolas Klauser return __value; 51e78f53d1SNikolas Klauser } 52e78f53d1SNikolas Klauser }; 53e78f53d1SNikolas Klauser } // namespace __clamp 54e78f53d1SNikolas Klauser 55e78f53d1SNikolas Klauser inline namespace __cpo { 56e78f53d1SNikolas Klauser inline constexpr auto clamp = __clamp::__fn{}; 57e78f53d1SNikolas Klauser } // namespace __cpo 58e78f53d1SNikolas Klauser } // namespace ranges 59e78f53d1SNikolas Klauser 60e78f53d1SNikolas Klauser _LIBCPP_END_NAMESPACE_STD 61e78f53d1SNikolas Klauser 62e78f53d1SNikolas Klauser #endif // _LIBCPP_STD_VER >= 20 63e78f53d1SNikolas Klauser 64e78f53d1SNikolas Klauser _LIBCPP_POP_MACROS 65e78f53d1SNikolas Klauser 66*ce777190SNikolas Klauser #endif // _LIBCPP___CXX03___ALGORITHM_RANGES_CLAMP_H 67