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
28template<class _Tp>
29struct _LIBCPP_TEMPLATE_VIS is_scalar : _BoolConstant<__is_scalar(_Tp)> { };
30
31#if _LIBCPP_STD_VER > 14
32template <class _Tp>
33inline constexpr bool is_scalar_v = __is_scalar(_Tp);
34#endif
35
36#else // __has_builtin(__is_scalar)
37
38template <class _Tp> struct __is_block : false_type {};
39#if defined(_LIBCPP_HAS_EXTENSION_BLOCKS)
40template <class _Rp, class ..._Args> struct __is_block<_Rp (^)(_Args...)> : true_type {};
41#endif
42
43template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_scalar
44    : public integral_constant<bool, is_arithmetic<_Tp>::value     ||
45                                     is_member_pointer<_Tp>::value ||
46                                     is_pointer<_Tp>::value        ||
47                                     __is_nullptr_t<_Tp>::value    ||
48                                     __is_block<_Tp>::value        ||
49                                     is_enum<_Tp>::value           > {};
50
51template <> struct _LIBCPP_TEMPLATE_VIS is_scalar<nullptr_t> : public true_type {};
52
53#if _LIBCPP_STD_VER > 14
54template <class _Tp>
55inline constexpr bool is_scalar_v = is_scalar<_Tp>::value;
56#endif
57
58#endif // __has_builtin(__is_scalar)
59
60_LIBCPP_END_NAMESPACE_STD
61
62#endif // _LIBCPP___TYPE_TRAITS_IS_SCALAR_H
63