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
25template <class _Tp>
26struct _LIBCPP_TEMPLATE_VIS is_function : integral_constant<bool, __is_function(_Tp)> {};
27
28#else
29
30template <class _Tp>
31struct _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 > 14
37template <class _Tp>
38inline 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