cbfunctor.h

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/*
 * This file is part of the Code::Blocks IDE and licensed under the GNU Lesser General Public License, version 3
 * http://www.gnu.org/licenses/lgpl-3.0.html
 */

#ifndef CB_FUNCTOR_H
#define CB_FUNCTOR_H

//uncomment the below line if you want to do the performance measure of the event processing
//#define PPRCESS_EVENT_PERFORMANCE_MEASURE

#ifdef PPRCESS_EVENT_PERFORMANCE_MEASURE
#include <typeinfo> // typeid()
#endif // PPRCESS_EVENT_PERFORMANCE_MEASURE

class IFunctorBase
{
    public:
        virtual ~IFunctorBase(){}
        virtual void* GetThis() = 0;

#ifdef PPRCESS_EVENT_PERFORMANCE_MEASURE
        // return the function name, this is used for Functor performance measure
        virtual const char* GetTypeName() = 0;
#endif // PPRCESS_EVENT_PERFORMANCE_MEASURE
};

template<typename EventType> class IEventFunctorBase : public IFunctorBase
{
    public:
        virtual void Call(EventType& event) = 0;
};

template<class ClassType, typename EventType> class cbEventFunctor : public IEventFunctorBase<EventType>
{
    private:
        typedef void (ClassType::*Member)(EventType&);
        ClassType* m_pThis;
        Member m_pMember;
    public:
        cbEventFunctor(ClassType* this_, Member member) : m_pThis(this_), m_pMember(member) {}
        cbEventFunctor(const cbEventFunctor<ClassType, EventType>& rhs) : m_pThis(rhs.m_pThis), m_pMember(rhs.m_pMember) {}
        void* GetThis() override { return m_pThis; }
        // usually the m_pThis is a pointer the instance of a specified class of ClassType
        // the m_pMember is a member function of the ClassType, so just call this member function
        void Call(EventType& event) override { if (m_pThis) (m_pThis->*m_pMember)(event); }

#ifdef PPRCESS_EVENT_PERFORMANCE_MEASURE
        // show the name by typeid operator
        virtual const char* GetTypeName(){return typeid(m_pMember).name();}
#endif // PPRCESS_EVENT_PERFORMANCE_MEASURE
};

#endif // CB_FUNCTOR_H