adaptor_from_functor.hpp

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// SPDX-FileCopyrightText: 2006-2025 Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2025 Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: BSD-3-Clause

 
#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