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_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
31template <class _Tp>
32_LIBCPP_NODISCARD_EXT _LIBCPP_INLINE_VISIBILITY constexpr underlying_type_t<_Tp>
33to_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