dynamic_mutable_compute_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_DYNAMIC_MUTABLE_COMPUTE_CELL_HPP
#define LIVE_CELLS_DYNAMIC_MUTABLE_COMPUTE_CELL_HPP
 
#include <functional>
#include <memory>
#include <concepts>
#include <type_traits>
 
#include "keys.hpp"
#include "mutable_compute_cell_state.hpp"
#include "changes_only_state.hpp"
 
namespace live_cells {
 
    template<std::invocable F, typename R, typename ValueType = std::invoke_result_t<F>>
    class dynamic_mutable_compute_cell_state : public mutable_compute_cell_state<ValueType> {
    protected:
        typedef ValueType value_type;
 
        typedef mutable_compute_cell_state<ValueType> parent;
 
    public:
 
        template <typename T, typename U>
        dynamic_mutable_compute_cell_state(key_ref key, T&& compute, U&& reverse) :
            parent(key, {}),
            compute_fn(std::forward<T>(compute)),
            reverse_fn(std::forward<U>(reverse)) {}
 
    protected:
        ValueType compute() override {
            auto t = argument_tracker::global().with_tracker([this] (auto cell) {
                if (!this->arguments.count(cell)) {
                    this->arguments.emplace(cell);
 
                    cell.add_observer(this->observer_ptr());
                }
            });
 
            return compute_fn();
        }
 
        void reverse_compute(ValueType value) override {
            reverse_fn(value);
        }
 
    private:
        F compute_fn;
 
        R reverse_fn;
 
    };
 
    template <std::invocable F, typename R>
    class dynamic_mutable_compute_changes_only_cell_state :
        public changes_only_cell_state<dynamic_mutable_compute_cell_state<F,R>> {
 
        typedef changes_only_cell_state<dynamic_mutable_compute_cell_state<F,R>> parent;
 
    public:
        using parent::parent;
    };
 
    template <std::invocable F, typename R, typename State = dynamic_mutable_compute_cell_state<F,R>>
    class dynamic_mutable_compute_cell : public stateful_cell<State> {
 
        typedef stateful_cell<State> parent;
 
    public:
 
        typedef std::invoke_result_t<F> value_type;
 
        template <typename T, typename U>
        dynamic_mutable_compute_cell(key_ref k, T&& compute, U&& reverse) :
            parent(k, std::forward<T>(compute), std::forward<U>(reverse)) {}
 
        template <typename T, typename U>
        dynamic_mutable_compute_cell(T&& compute, U&& reverse) :
            parent(key_ref::create<unique_key>(), std::forward<T>(compute), std::forward<U>(reverse)) {}
 
        value_type value() const {
            return this->state->value();
        }
 
        void value(value_type value) const {
            this->state->value(value);
        }
 
        value_type operator=(const value_type &value) {
            this->value(value);
            return value;
        }
 
        value_type operator=(const value_type &value) const {
            this->value(value);
            return value;
        }
 
        value_type operator()() const {
            argument_tracker::global().track_argument(*this);
            return value();
        }
    };
 
}  // live_cells
 
#endif /* LIVE_CELLS_DYNAMIC_MUTABLE_COMPUTE_CELL_HPP */