| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___TYPE_TRAITS_IS_CALLABLE_H |
| #define _LIBCPP___TYPE_TRAITS_IS_CALLABLE_H |
| |
| #include <__config> |
| #include <__type_traits/integral_constant.h> |
| #include <__utility/declval.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| template<class _Func, class... _Args, class = decltype(std::declval<_Func>()(std::declval<_Args>()...))> |
| true_type __is_callable_helper(int); |
| template<class...> |
| false_type __is_callable_helper(...); |
| |
| template<class _Func, class... _Args> |
| struct __is_callable : decltype(__is_callable_helper<_Func, _Args...>(0)) {}; |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___TYPE_TRAITS_IS_CALLABLE_H |
