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_MEMBER_FUNCTION_POINTER_H
10 #define _LIBCPP___TYPE_TRAITS_IS_MEMBER_FUNCTION_POINTER_H
11 
12 #include <__config>
13 #include <__type_traits/integral_constant.h>
14 #include <__type_traits/is_function.h>
15 #include <__type_traits/remove_cv.h>
16 #include <cstddef>
17 
18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19 #  pragma GCC system_header
20 #endif
21 
22 _LIBCPP_BEGIN_NAMESPACE_STD
23 
24 template <class _Tp>
25 struct __libcpp_is_member_pointer {
26   enum { __is_member = false, __is_func = false, __is_obj = false };
27 };
28 template <class _Tp, class _Up>
29 struct __libcpp_is_member_pointer<_Tp _Up::*> {
30   enum {
31     __is_member = true,
32     __is_func   = is_function<_Tp>::value,
33     __is_obj    = !__is_func,
34   };
35 };
36 
37 #if __has_builtin(__is_member_function_pointer)
38 
39 template <class _Tp>
40 struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer : _BoolConstant<__is_member_function_pointer(_Tp)> {};
41 
42 #  if _LIBCPP_STD_VER >= 17
43 template <class _Tp>
44 inline constexpr bool is_member_function_pointer_v = __is_member_function_pointer(_Tp);
45 #  endif
46 
47 #else // __has_builtin(__is_member_function_pointer)
48 
49 template <class _Tp>
50 struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer
51     : public _BoolConstant<__libcpp_is_member_pointer<__remove_cv_t<_Tp> >::__is_func> {};
52 
53 #  if _LIBCPP_STD_VER >= 17
54 template <class _Tp>
55 inline constexpr bool is_member_function_pointer_v = is_member_function_pointer<_Tp>::value;
56 #  endif
57 
58 #endif // __has_builtin(__is_member_function_pointer)
59 
60 _LIBCPP_END_NAMESPACE_STD
61 
62 #endif // _LIBCPP___TYPE_TRAITS_IS_MEMBER_FUNCTION_POINTER_H
63