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_SCALAR_H
10 #define _LIBCPP___TYPE_TRAITS_IS_SCALAR_H
11 
12 #include <__config>
13 #include <__type_traits/integral_constant.h>
14 #include <__type_traits/is_arithmetic.h>
15 #include <__type_traits/is_enum.h>
16 #include <__type_traits/is_member_pointer.h>
17 #include <__type_traits/is_null_pointer.h>
18 #include <__type_traits/is_pointer.h>
19 
20 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
21 #  pragma GCC system_header
22 #endif
23 
24 _LIBCPP_BEGIN_NAMESPACE_STD
25 
26 #if __has_builtin(__is_scalar)
27 
28 template <class _Tp>
29 struct _LIBCPP_TEMPLATE_VIS is_scalar : _BoolConstant<__is_scalar(_Tp)> {};
30 
31 #  if _LIBCPP_STD_VER >= 17
32 template <class _Tp>
33 inline constexpr bool is_scalar_v = __is_scalar(_Tp);
34 #  endif
35 
36 #else // __has_builtin(__is_scalar)
37 
38 template <class _Tp>
39 struct __is_block : false_type {};
40 #  if defined(_LIBCPP_HAS_EXTENSION_BLOCKS)
41 template <class _Rp, class... _Args>
42 struct __is_block<_Rp (^)(_Args...)> : true_type {};
43 #  endif
44 
45 // clang-format off
46 template <class _Tp>
47 struct _LIBCPP_TEMPLATE_VIS is_scalar
48     : public integral_constant<
49           bool, is_arithmetic<_Tp>::value ||
50                 is_member_pointer<_Tp>::value ||
51                 is_pointer<_Tp>::value ||
52                 __is_nullptr_t<_Tp>::value ||
53                 __is_block<_Tp>::value ||
54                 is_enum<_Tp>::value> {};
55 // clang-format on
56 
57 template <>
58 struct _LIBCPP_TEMPLATE_VIS is_scalar<nullptr_t> : public true_type {};
59 
60 #  if _LIBCPP_STD_VER >= 17
61 template <class _Tp>
62 inline constexpr bool is_scalar_v = is_scalar<_Tp>::value;
63 #  endif
64 
65 #endif // __has_builtin(__is_scalar)
66 
67 _LIBCPP_END_NAMESPACE_STD
68 
69 #endif // _LIBCPP___TYPE_TRAITS_IS_SCALAR_H
70