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 <__type_traits/integral_constant.h>
14 #include <cstddef>
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 // TODO: Clang incorrectly reports that __is_array is true for T[0].
23 //       Re-enable the branch once https://llvm.org/PR54705 is fixed.
24 #if __has_builtin(__is_array) && 0
25 
26 template <class _Tp>
27 struct _LIBCPP_TEMPLATE_VIS is_array : _BoolConstant<__is_array(_Tp)> { };
28 
29 #if _LIBCPP_STD_VER > 14
30 template <class _Tp>
31 inline constexpr bool is_array_v = __is_array(_Tp);
32 #endif
33 
34 #else
35 
36 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_array
37     : public false_type {};
38 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_array<_Tp[]>
39     : public true_type {};
40 template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS is_array<_Tp[_Np]>
41     : public true_type {};
42 
43 #if _LIBCPP_STD_VER > 14
44 template <class _Tp>
45 inline constexpr bool is_array_v = is_array<_Tp>::value;
46 #endif
47 
48 #endif // __has_builtin(__is_array)
49 
50 _LIBCPP_END_NAMESPACE_STD
51 
52 #endif // _LIBCPP___TYPE_TRAITS_IS_ARRAY_H
53