adaptor_from_functor.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/core/range/detail/adaptor_base.hpp>
 
namespace seqan3::detail
{
 
// ============================================================================
//  adaptor_from_functor
// ============================================================================
 
template <typename functor_type, typename ...stored_args_ts>
class adaptor_from_functor :
    public adaptor_base<adaptor_from_functor<functor_type, stored_args_ts...>, stored_args_ts...>
{
private:
    using base_type = adaptor_base<adaptor_from_functor<functor_type, stored_args_ts...>, stored_args_ts...>;
 
    friend base_type;
 
    functor_type fun;
 
    template <std::ranges::input_range urng_t>
    constexpr auto impl(urng_t && urange, stored_args_ts ... args) const
    {
        return fun(std::forward<urng_t>(urange), std::forward<stored_args_ts>(args)...);
    }
 
public:
    constexpr adaptor_from_functor()                                                  = default; 
    constexpr adaptor_from_functor(adaptor_from_functor const &)             noexcept = default; 
    constexpr adaptor_from_functor(adaptor_from_functor &&)                  noexcept = default; 
    constexpr adaptor_from_functor & operator=(adaptor_from_functor const &) noexcept = default; 
    constexpr adaptor_from_functor & operator=(adaptor_from_functor &&)      noexcept = default; 
    ~adaptor_from_functor()                                                  noexcept = default; 
 
    constexpr adaptor_from_functor(functor_type f, stored_args_ts ... args) :
        base_type{std::forward<stored_args_ts>(args)...}, fun{std::move(f)}
    {}
};
 
} // namespace seqan3::detail