tuple.hpp

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// -----------------------------------------------------------------------------------------------------
// Copyright (c) 2006-2022, Knut Reinert & Freie Universität Berlin
// Copyright (c) 2016-2022, Knut Reinert & MPI für molekulare Genetik
// This file may be used, modified and/or redistributed under the terms of the 3-clause BSD-License
// shipped with this file and also available at: https://github.com/seqan/seqan3/blob/master/LICENSE.md
// -----------------------------------------------------------------------------------------------------
 
#pragma once
 
#include <concepts>
#include <ranges>
 
#include <seqan3/alphabet/concept.hpp>
#include <seqan3/core/debug_stream/debug_stream_type.hpp>
#include <seqan3/utility/tuple/concept.hpp>
 
namespace seqan3
{
} // namespace seqan3
 
namespace seqan3::detail
{
 
template <typename char_t, typename tuple_t, std::size_t... I>
void print_tuple(debug_stream_type<char_t> & s, tuple_t && t, std::index_sequence<I...> const &)
{
    using std::get;
    s << '(';
    ((s << (I == 0 ? "" : ",") << get<I>(t)), ...);
    s << ')';
}
 
template <typename tuple_t>
concept debug_streamable_tuple = !
std::ranges::input_range<tuple_t> && !alphabet<tuple_t> && // exclude alphabet_tuple_base
    tuple_like<std::remove_cvref_t<tuple_t>>;
} // namespace seqan3::detail
 
namespace seqan3
{
 
template <typename char_t, typename tuple_t>
    requires (detail::debug_streamable_tuple<tuple_t>)
inline debug_stream_type<char_t> & operator<<(debug_stream_type<char_t> & s, tuple_t && t)
{
    detail::print_tuple(s,
                        std::forward<tuple_t>(t),
                        std::make_index_sequence<std::tuple_size_v<std::remove_cvref_t<tuple_t>>>{});
    return s;
}
 
 
} // namespace seqan3