2 //===----------------------------------------------------------------------===//
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
8 //===----------------------------------------------------------------------===//
10 #ifndef _LIBCPP___UTILITY_TO_UNDERLYING_H
11 #define _LIBCPP___UTILITY_TO_UNDERLYING_H
14 #include <__type_traits/underlying_type.h>
16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17 # pragma GCC system_header
20 _LIBCPP_BEGIN_NAMESPACE_STD
22 #ifndef _LIBCPP_CXX03_LANG
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
);
28 #endif // !_LIBCPP_CXX03_LANG
30 #if _LIBCPP_STD_VER >= 23
32 _LIBCPP_NODISCARD_EXT _LIBCPP_INLINE_VISIBILITY
constexpr underlying_type_t
<_Tp
>
33 to_underlying(_Tp __val
) noexcept
{
34 return _VSTD::__to_underlying(__val
);
38 _LIBCPP_END_NAMESPACE_STD
40 #endif // _LIBCPP___UTILITY_TO_UNDERLYING_H