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https://github.com/jart/cosmopolitan.git
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66 lines
2.2 KiB
C++
66 lines
2.2 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// Kokkos v. 4.0
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// Copyright (2022) National Technology & Engineering
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// Solutions of Sandia, LLC (NTESS).
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//
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// Under the terms of Contract DE-NA0003525 with NTESS,
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// the U.S. Government retains certain rights in this software.
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//
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//===---------------------------------------------------------------------===//
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#ifndef _LIBCPP___MDSPAN_DEFAULT_ACCESSOR_H
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#define _LIBCPP___MDSPAN_DEFAULT_ACCESSOR_H
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#include <__config>
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#include <__type_traits/is_abstract.h>
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#include <__type_traits/is_array.h>
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#include <__type_traits/is_convertible.h>
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#include <__type_traits/remove_const.h>
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#include <cinttypes>
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#include <cstddef>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 23
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template <class _ElementType>
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struct default_accessor {
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static_assert(!is_array_v<_ElementType>, "default_accessor: template argument may not be an array type");
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static_assert(!is_abstract_v<_ElementType>, "default_accessor: template argument may not be an abstract class");
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using offset_policy = default_accessor;
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using element_type = _ElementType;
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using reference = _ElementType&;
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using data_handle_type = _ElementType*;
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_LIBCPP_HIDE_FROM_ABI constexpr default_accessor() noexcept = default;
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template <class _OtherElementType>
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requires(is_convertible_v<_OtherElementType (*)[], element_type (*)[]>)
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_LIBCPP_HIDE_FROM_ABI constexpr default_accessor(default_accessor<_OtherElementType>) noexcept {}
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_LIBCPP_HIDE_FROM_ABI constexpr reference access(data_handle_type __p, size_t __i) const noexcept { return __p[__i]; }
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_LIBCPP_HIDE_FROM_ABI constexpr data_handle_type offset(data_handle_type __p, size_t __i) const noexcept {
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return __p + __i;
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}
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};
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#endif // _LIBCPP_STD_VER >= 23
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___MDSPAN_DEFAULT_ACCESSOR_H
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