construct

#include<iostream>

using namespace std;

class WebRTCVoiceEngine

{

public:

WebRTCVoiceEngine()

{

cout<<"WebRTCVoiceEngine"<<endl;

}

};

class WebRTCVideoEngine

{

public:

WebRTCVideoEngine()

{

cout<<"WebRTCVideoEngine"<<endl;

}

};

class MediaEngineInterface

{

};

template<class VOICE, class VIDEO>

class CompositeMediaEngine:public MediaEngineInterface

{

public:

CompositeMediaEngine()

{

cout<<"CompositeMediaEngine"<<endl;

}

protected:

VOICE voice_;

VIDEO video_;

};

int main()

{

MediaEngineInterface* media_engine_ = new CompositeMediaEngine<WebRTCVoiceEngine, WebRTCVideoEngine>();

}