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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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
//
// Kokkos v. 4.0
// Copyright (2022) National Technology & Engineering
// Solutions of Sandia, LLC (NTESS).
//
// Under the terms of Contract DE-NA0003525 with NTESS,
// the U.S. Government retains certain rights in this software.
//
//===---------------------------------------------------------------------===//
#ifndef _LIBCPP___MDSPAN_DEFAULT_ACCESSOR_H
#define _LIBCPP___MDSPAN_DEFAULT_ACCESSOR_H
#include <__config>
#include <__type_traits/is_abstract.h>
#include <__type_traits/is_array.h>
#include <__type_traits/is_convertible.h>
#include <__type_traits/remove_const.h>
#include <cinttypes>
#include <cstddef>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
#if _LIBCPP_STD_VER >= 23
template <class _ElementType>
struct default_accessor {
static_assert(!is_array_v<_ElementType>, "default_accessor: template argument may not be an array type");
static_assert(!is_abstract_v<_ElementType>, "default_accessor: template argument may not be an abstract class");
using offset_policy = default_accessor;
using element_type = _ElementType;
using reference = _ElementType&;
using data_handle_type = _ElementType*;
_LIBCPP_HIDE_FROM_ABI constexpr default_accessor() noexcept = default;
template <class _OtherElementType>
requires(is_convertible_v<_OtherElementType (*)[], element_type (*)[]>)
_LIBCPP_HIDE_FROM_ABI constexpr default_accessor(default_accessor<_OtherElementType>) noexcept {}
_LIBCPP_HIDE_FROM_ABI constexpr reference access(data_handle_type __p, size_t __i) const noexcept { return __p[__i]; }
_LIBCPP_HIDE_FROM_ABI constexpr data_handle_type offset(data_handle_type __p, size_t __i) const noexcept {
return __p + __i;
}
};
#endif // _LIBCPP_STD_VER >= 23
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP___MDSPAN_DEFAULT_ACCESSOR_H
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