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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_RANK_H
10#define _LIBCPP___TYPE_TRAITS_RANK_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(__array_rank) && !defined(_LIBCPP_COMPILER_CLANG_BASED) || \
23 (defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER >= 2001)
24
25template <class _Tp>
26struct _LIBCPP_NO_SPECIALIZATIONS rank : integral_constant<size_t, __array_rank(_Tp)> {};
27
28#else
29
30template <class _Tp>
31struct _LIBCPP_NO_SPECIALIZATIONS rank : public integral_constant<size_t, 0> {};
32
33_LIBCPP_DIAGNOSTIC_PUSH
34# if __has_warning("-Winvalid-specialization")
35_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Winvalid-specialization")
36# endif
37template <class _Tp>
38struct rank<_Tp[]> : public integral_constant<size_t, rank<_Tp>::value + 1> {};
39template <class _Tp, size_t _Np>
40struct rank<_Tp[_Np]> : public integral_constant<size_t, rank<_Tp>::value + 1> {};
41_LIBCPP_DIAGNOSTIC_POP
42
43#endif // __has_builtin(__array_rank)
44
45#if _LIBCPP_STD_VER >= 17
46template <class _Tp>
47_LIBCPP_NO_SPECIALIZATIONS inline constexpr size_t rank_v = rank<_Tp>::value;
48#endif
49
50_LIBCPP_END_NAMESPACE_STD
51
52#endif // _LIBCPP___TYPE_TRAITS_RANK_H
53

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