make_cell.hpp

/*
 * live_cells_cpp
 * Copyright (C) 2024  Alexander Gutev <alex.gutev@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you
 * may not use this file except in compliance with the License.  You
 * may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.  See the License for the specific language governing
 * permissions and limitations under the License.
 */
 
#ifndef LIVE_CELLS_MAKE_CELL_HPP
#define LIVE_CELLS_MAKE_CELL_HPP
 
#include <type_traits>
 
#include "observable.hpp"
#include "tracker.hpp"
 
namespace live_cells {
 
    template <typename C>
    using cell_value_type = decltype(std::declval<C>().value());
 
    template <typename C>
    struct make_cell {
        typedef cell_value_type<C> value_type;
 
        template <typename K, typename... Args>
        requires (!Keyable<C> && std::constructible_from<C,Args...>)
        make_cell(K&& key, Args&&... args) :
            cell(std::forward<Args>(args)...),
            key_(std::forward<K>(key)) {}
 
        template <typename... Args>
        requires (!Keyable<C> && std::constructible_from<C,Args...>)
        make_cell(Args&&... args) :
            cell(std::forward<Args>(args)...),
            key_(key_ref::create<unique_key>()) {}
 
        template <typename... Args>
        requires (Keyable<C> && std::constructible_from<C,Args...>)
        make_cell(Args&&... args) :
            cell(std::forward<Args>(args)...) {}
 
        void add_observer(observer::ref obs) const {
            cell.add_observer(obs);
        }
 
        void remove_observer(observer::ref obs) const {
            cell.remove_observer(obs);
        }
 
        value_type value() const {
            return cell.value();
        }
 
        value_type operator()() const requires (!Trackable<C>) {
            argument_tracker::global().track_argument(*this);
            return value();
        }
 
        value_type operator()() const requires (Trackable<C>) {
            return cell();
        }
 
        key_ref key() const requires Keyable<C> {
            return cell.key();
        }
 
        key_ref key() const requires (!Keyable<C>) {
            return key_;
        }
 
    protected:
        C cell;
 
        const std::enable_if<!Keyable<C>, key_ref>::type key_;
    };
 
    template <typename C, typename Parent = make_cell<C>>
    class make_mutable_cell : public Parent {
        using Parent::make_cell;
 
    public:
        using Parent::value;
 
        Parent::value_type operator=(const Parent::value_type &value) {
            this->value(value);
            return value;
        }
 
        Parent::value_type operator=(const Parent::value_type &value) const {
            this->value(value);
            return value;
        }
 
        void value(const Parent::value_type &value) const {
            Parent::cell.value(value);
        }
    };
 
}  // live_cells
 
#endif /* LIVE_CELLS_MAKE_CELL_HPP */