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> 25 class _LIBCPP_DEPRECATED_IN_CXX17 result_of; 26 27 template <class _Fp, class... _Args> 28 class _LIBCPP_TEMPLATE_VIS result_of<_Fp(_Args...)> : public __invoke_of<_Fp, _Args...> {}; 29 30 # if _LIBCPP_STD_VER >= 14 31 template <class _Tp> 32 using result_of_t _LIBCPP_DEPRECATED_IN_CXX17 = typename result_of<_Tp>::type; 33 # endif // _LIBCPP_STD_VER >= 14 34 #endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 35 36 _LIBCPP_END_NAMESPACE_STD 37 38 #endif // _LIBCPP___TYPE_TRAITS_RESULT_OF_H 39