/*
 * ValueUpdateAction.hpp
 *
 *  Created on: 21 δεκ. 2020 γ.
 *      Author: titov
 */

#ifndef UMLIBRARY_SCHEMATIC_ACTION_VALUEUPDATEACTION_HPP_
#define UMLIBRARY_SCHEMATIC_ACTION_VALUEUPDATEACTION_HPP_

#include "../../systemic/IFunctor.hh"
#include "../../systemic/IValue.hpp"
#include "../../systemic/IProcess.hh"

namespace schematic { namespace functor {

template<typename ValueType>
struct ValueUpdateAction : public systemic::IProcess {

    typedef systemic::IValue<ValueType> Value;
    typedef systemic::IFunctor<void> Action;

    Value & value;
    Action & action;

    ValueType previous;

    void process();

    ValueUpdateAction( Value & value, Action & action ) : value(value), action(action), previous(value) {}

};

}
}

template<typename ValueType>
inline void schematic::functor::ValueUpdateAction<ValueType>::process() {

    ValueType current = value;

    if( previous != current )
        action();

    previous = current;

}



#endif /* UMLIBRARY_SCHEMATIC_ACTION_VALUEUPDATEACTION_HPP_ */