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1// -*- C++ -*-2//===----------------------------------------------------------------------===//3//4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.5// See https://llvm.org/LICENSE.txt for license information.6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception7//8// Kokkos v. 4.09// Copyright (2022) National Technology & Engineering10// Solutions of Sandia, LLC (NTESS).11//12// Under the terms of Contract DE-NA0003525 with NTESS,13// the U.S. Government retains certain rights in this software.14//15//===---------------------------------------------------------------------===//16 17#ifndef _LIBCPP___MDSPAN_DEFAULT_ACCESSOR_H18#define _LIBCPP___MDSPAN_DEFAULT_ACCESSOR_H19 20#include <__config>21#include <__cstddef/size_t.h>22#include <__type_traits/is_abstract.h>23#include <__type_traits/is_array.h>24#include <__type_traits/is_convertible.h>25#include <__type_traits/remove_const.h>26 27#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)28# pragma GCC system_header29#endif30 31_LIBCPP_PUSH_MACROS32#include <__undef_macros>33 34_LIBCPP_BEGIN_NAMESPACE_STD35 36#if _LIBCPP_STD_VER >= 2337 38template <class _ElementType>39struct default_accessor {40 static_assert(!is_array_v<_ElementType>, "default_accessor: template argument may not be an array type");41 static_assert(!is_abstract_v<_ElementType>, "default_accessor: template argument may not be an abstract class");42 43 using offset_policy = default_accessor;44 using element_type = _ElementType;45 using reference = _ElementType&;46 using data_handle_type = _ElementType*;47 48 _LIBCPP_HIDE_FROM_ABI constexpr default_accessor() noexcept = default;49 template <class _OtherElementType>50 requires(is_convertible_v<_OtherElementType (*)[], element_type (*)[]>)51 _LIBCPP_HIDE_FROM_ABI constexpr default_accessor(default_accessor<_OtherElementType>) noexcept {}52 53 _LIBCPP_HIDE_FROM_ABI constexpr reference access(data_handle_type __p, size_t __i) const noexcept { return __p[__i]; }54 _LIBCPP_HIDE_FROM_ABI constexpr data_handle_type offset(data_handle_type __p, size_t __i) const noexcept {55 return __p + __i;56 }57};58 59#endif // _LIBCPP_STD_VER >= 2360 61_LIBCPP_END_NAMESPACE_STD62 63_LIBCPP_POP_MACROS64 65#endif // _LIBCPP___MDSPAN_DEFAULT_ACCESSOR_H66