accessor_conjugate.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2023 Tobias Hienzsch
 
#ifndef TETL_LINALG_ACCESSOR_CONJUGATE_HPP
#define TETL_LINALG_ACCESSOR_CONJUGATE_HPP
 
#include <etl/_linalg/conjugated_scalar.hpp>
#include <etl/_type_traits/add_const.hpp>
#include <etl/_type_traits/conditional.hpp>
#include <etl/_type_traits/is_arithmetic.hpp>
#include <etl/_type_traits/remove_cv.hpp>
 
namespace etl::linalg {
 
/// \ingroup linalg
template <typename Accessor>
struct accessor_conjugate {
    using reference = conditional_t<
        is_arithmetic_v<remove_cv_t<typename Accessor::element_type>>,
        typename Accessor::reference,
        detail::conjugated_scalar<typename Accessor::reference, remove_cv_t<typename Accessor::element_type>>
    >;
    using element_type     = add_const_t<conditional_t<
            is_arithmetic_v<remove_cv_t<typename Accessor::element_type>>,
            typename Accessor::element_type,
            typename reference::value_type
        >>;
    using data_handle_type = typename Accessor::data_handle_type;
    using offset_policy    = conditional_t<
           is_arithmetic_v<remove_cv_t<typename Accessor::element_type>>,
           typename Accessor::offset_policy,
           accessor_conjugate<typename Accessor::offset_policy>
       >;
 
    constexpr accessor_conjugate(Accessor a)
        : _nestedAccessor(a)
    {
    }
 
    [[nodiscard]] constexpr auto
    access(data_handle_type p, size_t i) const noexcept(noexcept(reference(_nestedAccessor.access(p, i)))) -> reference
    {
        return reference(_nestedAccessor.access(p, i));
    }
 
    [[nodiscard]] constexpr auto
    offset(data_handle_type p, size_t i) const noexcept(noexcept(_nestedAccessor.offset(p, i))) ->
        typename offset_policy::data_handle_type
    {
        _nestedAccessor.offset(p, i);
    }
 
    [[nodiscard]] constexpr auto nested_accessor() const -> Accessor
    {
        return _nestedAccessor;
    }
 
private:
    Accessor _nestedAccessor;
};
 
} // namespace etl::linalg
 
#endif // TETL_LINALG_ACCESSOR_CONJUGATE_HPP