| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___TYPE_TRAITS_EXTENT_H |
| #define _LIBCPP___TYPE_TRAITS_EXTENT_H |
| |
| #include <__config> |
| #include <__type_traits/integral_constant.h> |
| #include <cstddef> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if __has_builtin(__array_extent) |
| |
| template<class _Tp, size_t _Dim = 0> |
| struct _LIBCPP_TEMPLATE_VIS extent |
| : integral_constant<size_t, __array_extent(_Tp, _Dim)> { }; |
| |
| #if _LIBCPP_STD_VER > 14 |
| template <class _Tp, unsigned _Ip = 0> |
| inline constexpr size_t extent_v = __array_extent(_Tp, _Ip); |
| #endif |
| |
| #else // __has_builtin(__array_extent) |
| |
| template <class _Tp, unsigned _Ip = 0> struct _LIBCPP_TEMPLATE_VIS extent |
| : public integral_constant<size_t, 0> {}; |
| template <class _Tp> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], 0> |
| : public integral_constant<size_t, 0> {}; |
| template <class _Tp, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], _Ip> |
| : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {}; |
| template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], 0> |
| : public integral_constant<size_t, _Np> {}; |
| template <class _Tp, size_t _Np, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], _Ip> |
| : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {}; |
| |
| #if _LIBCPP_STD_VER > 14 |
| template <class _Tp, unsigned _Ip = 0> |
| inline constexpr size_t extent_v = extent<_Tp, _Ip>::value; |
| #endif |
| |
| #endif // __has_builtin(__array_extent) |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___TYPE_TRAITS_EXTENT_H |