as_const.hpp

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// -----------------------------------------------------------------------------------------------------
// Copyright (c) 2006-2020, Knut Reinert & Freie Universität Berlin
// Copyright (c) 2016-2020, 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/core/type_traits/function.hpp>
#include <seqan3/std/ranges>
 
namespace seqan3::detail
{
 
struct as_const_fn
{
    template <typename t>
    t operator()(t const && arg) const
    {
        return std::move(arg);
    }
 
    template <typename t>
    t const & operator()(t const & arg) const
    {
        return arg;
    }
};
 
} // namespace seqan3::detail
 
namespace seqan3::views
{
 
inline auto const as_const = std::views::transform(seqan3::detail::as_const_fn{});
 
} // namespace seqan3::views