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
23template <class _Tp>
24_LIBCPP_HIDE_FROM_ABI constexpr typename underlying_type<_Tp>::type __to_underlying(_Tp __val) noexcept {
25 return static_cast<typename underlying_type<_Tp>::type>(__val);
26}
27#endif // !_LIBCPP_CXX03_LANG
28
29#if _LIBCPP_STD_VER >= 23
30template <class _Tp>
31[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr underlying_type_t<_Tp> to_underlying(_Tp __val) noexcept {
32 return std::__to_underlying(__val);
33}
34#endif
35
36_LIBCPP_END_NAMESPACE_STD
37
38#endif // _LIBCPP___UTILITY_TO_UNDERLYING_H
39