char.hpp

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// -----------------------------------------------------------------------------------------------------
// Copyright (c) 2006-2021, Knut Reinert & Freie Universität Berlin
// Copyright (c) 2016-2021, 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 <seqan3/alphabet/concept.hpp>
#include <seqan3/utility/detail/integer_traits.hpp>
 
namespace seqan3::detail
{
template <typename type>
constexpr bool is_char_adaptation_v = std::same_as<type, char>     ||
                                      std::same_as<type, char16_t> ||
                                      std::same_as<type, char32_t> ||
                                      std::same_as<type, wchar_t>;
} // namespace seqan3::detail
 
namespace seqan3::custom
{
 
template <typename char_type>
    requires detail::is_char_adaptation_v<char_type>
struct alphabet<char_type>
{
    static constexpr auto alphabet_size =
        detail::min_viable_uint_t<detail::size_in_values_v<char_type>>{detail::size_in_values_v<char_type>};
 
    static constexpr char_type to_char(char_type const chr) noexcept
    {
        return chr;
    }
 
    static constexpr auto to_rank(char_type const chr) noexcept
    {
        return static_cast<detail::min_viable_uint_t<alphabet_size - 1>>(chr);
    }
 
    static constexpr char_type & assign_char_to(char_type const chr2, char_type & chr) noexcept
    {
        return chr = chr2;
    }
 
    static constexpr char_type & assign_rank_to(decltype(alphabet::to_rank(char_type{})) const rank,
                                                char_type & chr) noexcept
    {
        return chr = rank;
    }
};
 
} // namespace seqan3::custom