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 { typedef _Tp type; };
22 
23 template <class _Tp>
24 using __type_identity_t _LIBCPP_NODEBUG = typename __type_identity<_Tp>::type;
25 
26 #if _LIBCPP_STD_VER > 17
27 template<class _Tp> struct type_identity { typedef _Tp type; };
28 template<class _Tp> using type_identity_t = typename type_identity<_Tp>::type;
29 #endif
30 
31 _LIBCPP_END_NAMESPACE_STD
32 
33 #endif // _LIBCPP___TYPE_TRAITS_TYPE_IDENTITY_H
34