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1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef _LIBCPP___TYPE_TRAITS_UNDERLYING_TYPE_H
10#define _LIBCPP___TYPE_TRAITS_UNDERLYING_TYPE_H
11
12#include <__config>
13#include <__type_traits/is_enum.h>
14
15#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
16# pragma GCC system_header
17#endif
18
19_LIBCPP_BEGIN_NAMESPACE_STD
20
21template <class _Tp, bool>
22struct __underlying_type_impl;
23
24template <class _Tp>
25struct __underlying_type_impl<_Tp, false> {};
26
27template <class _Tp>
28struct __underlying_type_impl<_Tp, true> {
29 typedef __underlying_type(_Tp) type;
30};
31
32template <class _Tp>
33struct _LIBCPP_NO_SPECIALIZATIONS underlying_type : __underlying_type_impl<_Tp, is_enum<_Tp>::value> {};
34
35// GCC doesn't SFINAE away when using __underlying_type directly
36#if !defined(_LIBCPP_COMPILER_GCC)
37template <class _Tp>
38using __underlying_type_t _LIBCPP_NODEBUG = __underlying_type(_Tp);
39#else
40template <class _Tp>
41using __underlying_type_t _LIBCPP_NODEBUG = typename underlying_type<_Tp>::type;
42#endif
43
44#if _LIBCPP_STD_VER >= 14
45template <class _Tp>
46using underlying_type_t = __underlying_type_t<_Tp>;
47#endif
48
49_LIBCPP_END_NAMESPACE_STD
50
51#endif // _LIBCPP___TYPE_TRAITS_UNDERLYING_TYPE_H
52

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source code of libcxx/include/__type_traits/underlying_type.h