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 <__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: Enable using the builtin __array_rank when https://llvm.org/PR57133 is resolved 23#if __has_builtin(__array_rank) && 0 24 25template <class _Tp> 26struct rank : integral_constant<size_t, __array_rank(_Tp)> {}; 27 28#else 29 30template <class _Tp> 31struct _LIBCPP_TEMPLATE_VIS rank : public integral_constant<size_t, 0> {}; 32template <class _Tp> 33struct _LIBCPP_TEMPLATE_VIS rank<_Tp[]> : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 34template <class _Tp, size_t _Np> 35struct _LIBCPP_TEMPLATE_VIS rank<_Tp[_Np]> : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 36 37#endif // __has_builtin(__array_rank) 38 39#if _LIBCPP_STD_VER >= 17 40template <class _Tp> 41inline constexpr size_t rank_v = rank<_Tp>::value; 42#endif 43 44_LIBCPP_END_NAMESPACE_STD 45 46#endif // _LIBCPP___TYPE_TRAITS_RANK_H 47