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_RESULT_OF_H
10 #define _LIBCPP___TYPE_TRAITS_RESULT_OF_H
11 
12 #include <__config>
13 #include <__functional/invoke.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 
21 // result_of
22 
23 #if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS)
24 template <class _Callable> class _LIBCPP_DEPRECATED_IN_CXX17 result_of;
25 
26 template <class _Fp, class ..._Args>
27 class _LIBCPP_TEMPLATE_VIS result_of<_Fp(_Args...)>
28     : public __invoke_of<_Fp, _Args...>
29 {
30 };
31 
32 #if _LIBCPP_STD_VER > 11
33 template <class _Tp> using result_of_t _LIBCPP_DEPRECATED_IN_CXX17 = typename result_of<_Tp>::type;
34 #endif // _LIBCPP_STD_VER > 11
35 #endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS)
36 
37 _LIBCPP_END_NAMESPACE_STD
38 
39 #endif // _LIBCPP___TYPE_TRAITS_RESULT_OF_H
40