observer.hpp

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//This file is part of Bertini 2.
//
//bertini2/detail/observer.hpp is free software: you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation, either version 3 of the License, or
//(at your option) any later version.
//
//bertini2/detail/observer.hpp is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//GNU General Public License for more details.
//
//You should have received a copy of the GNU General Public License
//along with bertini2/detail/observer.hpp.  If not, see <http://www.gnu.org/licenses/>.
//
// Copyright(C) 2015 - 2021 by Bertini2 Development Team
//
// See <http://www.gnu.org/licenses/> for a copy of the license, 
// as well as COPYING.  Bertini2 is provided with permitted 
// additional terms in the b2/licenses/ directory.
 
// individual authors of this file include:
// silviana amethyst, university of wisconsin-eau claire
//

 
#ifndef BERTINI_DETAIL_OBSERVER_HPP
#define BERTINI_DETAIL_OBSERVER_HPP
 
#include <tuple>
#include <utility>
 
#include <boost/fusion/adapted/std_tuple.hpp>
 
#include <boost/fusion/algorithm/iteration/for_each.hpp>
#include <boost/fusion/include/for_each.hpp>
 
#include "bertini2/detail/events.hpp"
 
namespace bertini{
 

    class AnyObserver
    { BOOST_TYPE_INDEX_REGISTER_CLASS
    public:
        virtual ~AnyObserver() = default;

        virtual void Observe(AnyEvent const& e) = 0;
    };
 

    template<class ObservedT>
    class Observer : public AnyObserver
    { BOOST_TYPE_INDEX_REGISTER_CLASS
    public:
        virtual ~Observer() = default;
 
        
    };
 
 
 
    
    template<class ObservedT, template<class> class... ObserverTypes>
    class MultiObserver : public Observer<ObservedT>
    {   BOOST_TYPE_INDEX_REGISTER_CLASS
    public:

        void Observe(AnyEvent const& e) override
        {   
            using namespace boost::fusion;
            auto f = [&e](auto &obs) { obs.Observe(e); };
            for_each(observers_, f);
        }
 
        std::tuple<ObserverTypes<ObservedT>...> observers_;
        virtual ~MultiObserver() = default;
    };
 
 
}
 
#endif