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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_TYPE_IDENTITY_H
10#define _LIBCPP___TYPE_TRAITS_TYPE_IDENTITY_H
11
12#include <__config>
13
14#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
15# pragma GCC system_header
16#endif
17
18_LIBCPP_BEGIN_NAMESPACE_STD
19
20template <class _Tp>
21struct __type_identity {
22 typedef _Tp type;
23};
24
25template <class _Tp>
26using __type_identity_t _LIBCPP_NODEBUG = typename __type_identity<_Tp>::type;
27
28#if _LIBCPP_STD_VER >= 20
29template <class _Tp>
30struct _LIBCPP_NO_SPECIALIZATIONS type_identity {
31 typedef _Tp type;
32};
33template <class _Tp>
34using type_identity_t = typename type_identity<_Tp>::type;
35#endif
36
37_LIBCPP_END_NAMESPACE_STD
38
39#endif // _LIBCPP___TYPE_TRAITS_TYPE_IDENTITY_H
40

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