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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_ARRAY_H
10#define _LIBCPP___TYPE_TRAITS_IS_ARRAY_H
11
12#include <__config>
13#include <__cstddef/size_t.h>
14#include <__type_traits/integral_constant.h>
15
16#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17# pragma GCC system_header
18#endif
19
20_LIBCPP_BEGIN_NAMESPACE_STD
21
22#if __has_builtin(__is_array) && \
23 (!defined(_LIBCPP_COMPILER_CLANG_BASED) || (defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER >= 1900))
24
25template <class _Tp>
26struct _LIBCPP_NO_SPECIALIZATIONS is_array : _BoolConstant<__is_array(_Tp)> {};
27
28# if _LIBCPP_STD_VER >= 17
29template <class _Tp>
30_LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_array_v = __is_array(_Tp);
31# endif
32
33#else
34
35template <class _Tp>
36struct is_array : public false_type {};
37template <class _Tp>
38struct is_array<_Tp[]> : public true_type {};
39template <class _Tp, size_t _Np>
40struct is_array<_Tp[_Np]> : public true_type {};
41
42# if _LIBCPP_STD_VER >= 17
43template <class _Tp>
44inline constexpr bool is_array_v = is_array<_Tp>::value;
45# endif
46
47#endif // __has_builtin(__is_array)
48
49_LIBCPP_END_NAMESPACE_STD
50
51#endif // _LIBCPP___TYPE_TRAITS_IS_ARRAY_H
52

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