validate_char_for.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 <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 validate_char_for = deep{std::views::transform(
    []<typename char_t>(char_t && in) -> char_t
    {
        static_assert(
            std::common_reference_with<char_t, alphabet_char_t<alphabet_type>>,
            "The innermost value type must have a common reference to underlying char type of alphabet_type.");
 
        if (!char_is_valid_for<alphabet_type>(in))
        {
            throw seqan3::invalid_char_assignment{"alphabet_type", in};
        }
        return std::forward<char_t>(in);
    })};
 
} // namespace seqan3::views