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 // TODO: Enable using the builtin __array_rank when https://llvm.org/PR57133 is resolved 23 #if __has_builtin(__array_rank) && 0 24 25 template <class _Tp> 26 struct rank : integral_constant<size_t, __array_rank(_Tp)> {}; 27 28 #else 29 30 template <class _Tp> 31 struct _LIBCPP_TEMPLATE_VIS _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 37 template <class _Tp> 38 struct _LIBCPP_TEMPLATE_VIS rank<_Tp[]> : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 39 template <class _Tp, size_t _Np> 40 struct _LIBCPP_TEMPLATE_VIS 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 46 template <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