门面模式 Facade

门面模式，是指提供一个统一的接口去访问多个子系统的多个不同的接口，它为子系统中的一组接口提供一个统一的高层接口。使用子系统更容易使用。

 

例子如下，完成program任务，内部完成 code compile run任务

#include "iostream"

using namespace std;

class code{

public:

    void active(){

        cout<<"finish code"<<endl;

    }

};



class compile{

public:

    void active(){

        cout<<"finish compile"<<endl;

    }

};



class run{

public:

    void active(){

        cout<<"finish run"<<endl;

    }

};



class program{

public:

    program(){

        pcode = new code;

        pcompile = new compile;

        prun = new run;

    }

    ~program(){

        delete pcode;

        delete pcompile;

        delete prun;

    }



    void dotask(){

        pcode->active();

        pcompile->active();

        prun->active();



        cout<<"the task to program is finished"<<endl;

    }



private:

    code * pcode;

    compile * pcompile;

    run * prun;

};



int main(int argc, char* argv[])

{

    program * pprogram = new program;

    pprogram->dotask();

    return 0;

}