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_IS_FUNCTIONAL_H 10 #define _LIBCPP___TYPE_TRAITS_IS_FUNCTIONAL_H 11 12 #include <__config> 13 #include <__type_traits/integral_constant.h> 14 #include <__type_traits/is_const.h> 15 #include <__type_traits/is_reference.h> 16 17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18 # pragma GCC system_header 19 #endif 20 21 _LIBCPP_BEGIN_NAMESPACE_STD 22 23 #if __has_builtin(__is_function) 24 25 template <class _Tp> 26 struct _LIBCPP_TEMPLATE_VIS is_function : integral_constant<bool, __is_function(_Tp)> {}; 27 28 #else 29 30 template <class _Tp> 31 struct _LIBCPP_TEMPLATE_VIS is_function 32 : public integral_constant<bool, !(is_reference<_Tp>::value || is_const<const _Tp>::value)> {}; 33 34 #endif // __has_builtin(__is_function) 35 36 #if _LIBCPP_STD_VER >= 17 37 template <class _Tp> 38 inline constexpr bool is_function_v = is_function<_Tp>::value; 39 #endif 40 41 _LIBCPP_END_NAMESPACE_STD 42 43 #endif // _LIBCPP___TYPE_TRAITS_IS_FUNCTIONAL_H 44