char_to.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/std/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