char_to.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 <seqan3/alphabet/concept.hpp>
#include <seqan3/utility/type_traits/basic.hpp>
#include <seqan3/utility/views/deep.hpp>
 
namespace seqan3::views
{
template <alphabet alphabet_type>
inline auto const char_to = deep{std::views::transform(
    [](auto && in)
    {
        static_assert(
            std::common_reference_with<decltype(in), alphabet_char_t<alphabet_type>>,
            "The innermost value type must have a common reference to underlying char type of alphabet_type.");
        // call element-wise assign_char from the alphabet
        return assign_char_to(in, alphabet_type{});
    })};
 
} // namespace seqan3::views