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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_EMPTY_H
10#define _LIBCPP___TYPE_TRAITS_IS_EMPTY_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
21template <class _Tp>
22struct _LIBCPP_NO_SPECIALIZATIONS is_empty : integral_constant<bool, __is_empty(_Tp)> {};
23
24#if _LIBCPP_STD_VER >= 17
25template <class _Tp>
26_LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_empty_v = __is_empty(_Tp);
27#endif
28
29_LIBCPP_END_NAMESPACE_STD
30
31#endif // _LIBCPP___TYPE_TRAITS_IS_EMPTY_H
32

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source code of libcxx/include/__type_traits/is_empty.h