merged_observable.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_MERGED_OBSERVABLE_HPP
#define LIVE_CELLS_MERGED_OBSERVABLE_HPP
 
namespace live_cells {
 
    template <Cell T, Cell... Ts>
    class merged_observable {
    public:
 
        merged_observable(T first, Ts... rest) :
            first(first),
            rest(rest...) {}
 
        void add_observer(observer::ref o) const {
            first.add_observer(o);
            rest.add_observer(o);
        }
 
        void remove_observer(observer::ref o) const {
            first.remove_observer(o);
            rest.remove_observer(o);
        }
 
    private:
        T first;
        merged_observable<Ts...> rest;
    };
 
    template <Cell T>
    class merged_observable<T> {
    public:
 
        merged_observable(T o) : first(o) {}
 
        void add_observer(observer::ref o) const {
            first.add_observer(o);
        }
 
        void remove_observer(observer::ref o) const {
            first.remove_observer(o);
        }
 
    private:
        T first;
    };
 
 
}  // live_cells
 
#endif /* LIVE_CELLS_MERGED_OBSERVABLE_HPP */