1fe6060f1SDimitry Andric // -*- C++ -*- 2349cc55cSDimitry Andric //===----------------------------------------------------------------------===// 3fe6060f1SDimitry Andric // 4fe6060f1SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5fe6060f1SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 6fe6060f1SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7fe6060f1SDimitry Andric // 8fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 9fe6060f1SDimitry Andric 10fe6060f1SDimitry Andric #ifndef _LIBCPP___UTILITY_TO_UNDERLYING_H 11fe6060f1SDimitry Andric #define _LIBCPP___UTILITY_TO_UNDERLYING_H 12fe6060f1SDimitry Andric 13fe6060f1SDimitry Andric #include <__config> 14bdd1243dSDimitry Andric #include <__type_traits/underlying_type.h> 15fe6060f1SDimitry Andric 16fe6060f1SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17fe6060f1SDimitry Andric # pragma GCC system_header 18fe6060f1SDimitry Andric #endif 19fe6060f1SDimitry Andric 20fe6060f1SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 21fe6060f1SDimitry Andric 22fe6060f1SDimitry Andric #ifndef _LIBCPP_CXX03_LANG 23fe6060f1SDimitry Andric template <class _Tp> __to_underlying(_Tp __val)24cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr typename underlying_type<_Tp>::type __to_underlying(_Tp __val) noexcept { 25fe6060f1SDimitry Andric return static_cast<typename underlying_type<_Tp>::type>(__val); 26fe6060f1SDimitry Andric } 27fe6060f1SDimitry Andric #endif // !_LIBCPP_CXX03_LANG 28fe6060f1SDimitry Andric 2906c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 23 30fe6060f1SDimitry Andric template <class _Tp> to_underlying(_Tp __val)31*0fca6ea1SDimitry Andric[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr underlying_type_t<_Tp> to_underlying(_Tp __val) noexcept { 325f757f3fSDimitry Andric return std::__to_underlying(__val); 33fe6060f1SDimitry Andric } 34fe6060f1SDimitry Andric #endif 35fe6060f1SDimitry Andric 36fe6060f1SDimitry Andric _LIBCPP_END_NAMESPACE_STD 37fe6060f1SDimitry Andric 38fe6060f1SDimitry Andric #endif // _LIBCPP___UTILITY_TO_UNDERLYING_H 39