default_accessor.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2023 Tobias Hienzsch
 
#ifndef TETL_MDSPAN_DEFAULT_ACCESSOR_HPP
#define TETL_MDSPAN_DEFAULT_ACCESSOR_HPP
 
#include <etl/_cstddef/size_t.hpp>
#include <etl/_type_traits/is_convertible.hpp>
 
namespace etl {
 
template <typename ElementType>
struct default_accessor {
    using offset_policy    = default_accessor;
    using element_type     = ElementType;
    using reference        = ElementType&;
    using data_handle_type = ElementType*;
 
    constexpr default_accessor() noexcept = default;
 
    template <typename OtherElementType>
        requires is_convertible_v<OtherElementType (*)[], element_type (*)[]>
    constexpr default_accessor(default_accessor<OtherElementType> /*unused*/) noexcept
    {
    }
 
    [[nodiscard]] constexpr auto access(data_handle_type p, size_t i) const noexcept -> reference
    {
        return p[i];
    }
 
    [[nodiscard]] constexpr auto offset(data_handle_type p, size_t i) const noexcept -> data_handle_type
    {
        return p + i;
    }
};
 
} // namespace etl
 
#endif // TETL_MDSPAN_DEFAULT_ACCESSOR_HPP