23种设计模式之外观模式（结构型，6 Facade，c++实现）

代码实现：

#include <iostream>

#include <list>

#include <string>

using namespace std;

class SubsystemA

{

public:

void doThing()

{

cout << "SubsystemA do thing" << endl;

}

};

class SubsystemB

{

public:

void doThing()

{

cout << "SubsystemB do thing" << endl;

}

};

class SubsystemC

{

public:

void doThing()

{

cout << "SubsystemC do thing" << endl;

}

};

class Facade

{

public:

Facade() 

{

subsystemA = new SubsystemA;

subsystemB = new SubsystemB;

subsystemC = new SubsystemC;

}

~Facade()

{

delete subsystemA;

delete subsystemB;

delete subsystemC;

}    

void doThing() {

subsystemA->doThing();

subsystemB->doThing();

subsystemC->doThing();

}

private:

SubsystemA* subsystemA;

SubsystemB* subsystemB;

SubsystemC* subsystemC;

};

void main()

{

Facade* facade = new Facade;

facade->doThing();

}