convert.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/concepts>
#include <seqan3/std/ranges>
 
#include <seqan3/utility/concept/exposition_only/core_language.hpp>
 
namespace seqan3::views
{
template <typename out_t>
inline auto constexpr convert = std::views::transform([] (auto && in) -> out_t
{
    static_assert(std::convertible_to<decltype(in) &&, out_t> || explicitly_convertible_to<decltype(in) &&, out_t>,
                  "The reference type of the input to views::convert is not convertible to out_t.");
 
    if constexpr (std::convertible_to<decltype(in) &&, out_t>)
        return std::forward<decltype(in)>(in);
    else
        return static_cast<out_t>(std::forward<decltype(in)>(in));
});
 
} // namespace seqan3::views