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_STANDARD_LAYOUT_H
10 #define _LIBCPP___TYPE_TRAITS_IS_STANDARD_LAYOUT_H
11 
12 #include <__config>
13 #include <__type_traits/integral_constant.h>
14 
15 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
16 #  pragma GCC system_header
17 #endif
18 
19 _LIBCPP_BEGIN_NAMESPACE_STD
20 
21 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_standard_layout
22 #if __has_builtin(__is_standard_layout)
23     : public integral_constant<bool, __is_standard_layout(_Tp)>
24 #else
25     : integral_constant<bool, is_scalar<typename remove_all_extents<_Tp>::type>::value>
26 #endif
27     {};
28 
29 #if _LIBCPP_STD_VER > 14
30 template <class _Tp>
31 inline constexpr bool is_standard_layout_v = is_standard_layout<_Tp>::value;
32 #endif
33 
34 _LIBCPP_END_NAMESPACE_STD
35 
36 #endif // _LIBCPP___TYPE_TRAITS_IS_STANDARD_LAYOUT_H
37