1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___UTILITY_TO_UNDERLYING_H 11 #define _LIBCPP___UTILITY_TO_UNDERLYING_H 12 13 #include <__config> 14 #include <__type_traits/underlying_type.h> 15 16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17 # pragma GCC system_header 18 #endif 19 20 _LIBCPP_BEGIN_NAMESPACE_STD 21 22 #ifndef _LIBCPP_CXX03_LANG 23 template <class _Tp> 24 _LIBCPP_INLINE_VISIBILITY constexpr typename underlying_type<_Tp>::type 25 __to_underlying(_Tp __val) noexcept { 26 return static_cast<typename underlying_type<_Tp>::type>(__val); 27 } 28 #endif // !_LIBCPP_CXX03_LANG 29 30 #if _LIBCPP_STD_VER > 20 31 template <class _Tp> 32 _LIBCPP_NODISCARD_EXT _LIBCPP_INLINE_VISIBILITY constexpr underlying_type_t<_Tp> 33 to_underlying(_Tp __val) noexcept { 34 return _VSTD::__to_underlying(__val); 35 } 36 #endif 37 38 _LIBCPP_END_NAMESPACE_STD 39 40 #endif // _LIBCPP___UTILITY_TO_UNDERLYING_H 41