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//===----------------------------------------------------------------------===//
//
// 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 >= 17
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 >= 17
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
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