23种设计模式C++实例之外观模式

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为各个不同的类提供统一的接口，然后通过外观模式将其组合起来，对外提供一个统一的接口。

#include <iostream>using namespace std;/* * 外观模式:将子系统中的一组接口提供一个一致的界面 * 外观模式定义了一个高层接口，这个接口使得这一子系统更加容易使用 * */class SubsysA {public:void dothing() {cout << "SubsysA do thing" << endl;}};class SubsysB {public:void dothing() {cout << "SubsysB do thing" << endl;}};class SubsysC {public:void dothing() {cout << "SubsysC do thing" << endl;}};class Facade {public:Facade() {m_sysA = new SubsysA;m_sysB = new SubsysB;m_sysC = new SubsysC;}~Facade() {if (m_sysA != NULL) {delete m_sysA;m_sysA = NULL;}if (m_sysB != NULL) {delete m_sysB;m_sysB = NULL;}if (m_sysC != NULL) {delete m_sysC;m_sysC = NULL;}}void dothing() {m_sysA->dothing();m_sysB->dothing();m_sysC->dothing();}private:SubsysA* m_sysA;SubsysB* m_sysB;SubsysC* m_sysC;};int main() {// 使用外观模式之前SubsysA* a = new SubsysA;a->dothing();delete a;SubsysB* b = new SubsysB;b->dothing();delete b;SubsysC* c = new SubsysC;c->dothing();delete c;cout << endl;// 使用外观模式之前Facade* facade = new Facade;facade->dothing();delete facade;return 0;}

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