transfer_type_modifier_onto.hpp

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// SPDX-FileCopyrightText: 2006-2025 Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2025 Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: BSD-3-Clause

 
#pragma once
 
#include <type_traits>
 
#include <seqan3/core/platform.hpp>
 
namespace seqan3::detail
{

template <typename source_t, typename target_t>
struct transfer_type_modifier_onto
{
private:
    using maybe_const_target_t = std::conditional_t<std::is_const_v<std::remove_reference_t<source_t>>
                                                        || std::is_const_v<std::remove_reference_t<target_t>>,
                                                    std::add_const_t<std::remove_cvref_t<target_t>>,
                                                    std::remove_cvref_t<target_t>>;

    using maybe_rvalue_reference_t =
        std::conditional_t<std::is_rvalue_reference_v<source_t> || std::is_rvalue_reference_v<target_t>,
                           std::add_rvalue_reference_t<maybe_const_target_t>,
                           maybe_const_target_t>;

    using maybe_lvalue_reference_target_t =
        std::conditional_t<std::is_lvalue_reference_v<source_t> || std::is_lvalue_reference_v<target_t>,
                           std::add_lvalue_reference_t<maybe_rvalue_reference_t>,
                           maybe_rvalue_reference_t>;
 
public:
    using type = maybe_lvalue_reference_target_t;
};

template <typename source_t, typename target_t>
using transfer_type_modifier_onto_t = typename transfer_type_modifier_onto<source_t, target_t>::type;
 
} // namespace seqan3::detail