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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 | |
20 | template <class _Tp> |
21 | struct __type_identity { |
22 | typedef _Tp type; |
23 | }; |
24 | |
25 | template <class _Tp> |
26 | using __type_identity_t _LIBCPP_NODEBUG = typename __type_identity<_Tp>::type; |
27 | |
28 | #if _LIBCPP_STD_VER >= 20 |
29 | template <class _Tp> |
30 | struct _LIBCPP_NO_SPECIALIZATIONS type_identity { |
31 | typedef _Tp type; |
32 | }; |
33 | template <class _Tp> |
34 | using 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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