alignment/pairwise/detail/concept.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 <ranges>
#include <tuple>
 
#include <seqan3/alphabet/concept.hpp>
#include <seqan3/utility/tuple/concept.hpp>
 
namespace seqan3::detail
{

template <typename t>
concept sequence_pair = requires () {
    requires tuple_like<t>;
    requires std::tuple_size_v<t> == 2;
    requires std::ranges::forward_range<std::tuple_element_t<0, t>>;
    requires std::ranges::forward_range<std::tuple_element_t<1, t>>;
    requires semialphabet<std::ranges::range_value_t<std::tuple_element_t<0, t>>>;
    requires semialphabet<std::ranges::range_value_t<std::tuple_element_t<1, t>>>;
};

template <typename t>
concept sequence_pair_range = std::ranges::forward_range<t> && sequence_pair<std::ranges::range_value_t<t>>;

template <typename t>
concept indexed_sequence_pair_range = std::ranges::forward_range<t> && requires (std::ranges::range_value_t<t> value) {
    requires tuple_like<decltype(value)>;
    requires std::tuple_size_v<decltype(value)> == 2;
    requires sequence_pair<std::tuple_element_t<0, decltype(value)>>;
    requires std::copy_constructible<std::tuple_element_t<1, decltype(value)>>;
};

template <typename t>
concept align_pairwise_single_input =
    (sequence_pair<std::remove_reference_t<t>> && std::is_lvalue_reference_v<t>)
    || (std::ranges::viewable_range<std::tuple_element_t<0, std::remove_reference_t<t>>>
        && std::ranges::viewable_range<std::tuple_element_t<1, std::remove_reference_t<t>>>);

template <typename t>
concept align_pairwise_range_input =
    std::ranges::forward_range<t> && sequence_pair<std::ranges::range_value_t<t>>
    && ((std::ranges::viewable_range<t> && std::is_lvalue_reference_v<std::ranges::range_reference_t<t>>)
        || align_pairwise_single_input<std::remove_reference_t<std::ranges::range_reference_t<t>>>);
} // namespace seqan3::detail