《設(shè)計(jì)模式09》-橋接模式

第三部分結(jié)構(gòu)型設(shè)計(jì)模式橋接模式(BridgePattern)適配器模式(AdpterPattern)合成模式(CompsitePattern)門面模式(FacadePattern)裝飾模式(DecoratorPattern)代理模式(ProxyPattern)享元模式(FlyweightPattern)1橋接模式(BridgePattern)classA{public:

virtual~A();

virtualvoidf();

virtualvoidg();private:

int

x;

int

y;};變化的三個方向：1）接口的變化2）實(shí)現(xiàn)的變化3）屬性的變化(本質(zhì)上，還是實(shí)現(xiàn)的變化)適應(yīng)單個方向的變化容易組合和繼承方式均可適應(yīng)接口變化方法classA{public:

virtual~A();

virtualvoidf();

virtualvoidg();protected:

int

x;

int

y;};classNewA:publicA{public:

virtual~NewA();

virtualvoidh();};classNewA{public:

NewA(A*oldA):pa(oldA){}

virtual~NewA();

virtualvoidf(){pa->f();}

virtualvoidg(){pa->g();}

virtualvoidh();private:

A

*pa;};接口變化：增加新的功能h()適應(yīng)實(shí)現(xiàn)變化方法classA{public:

virtual~A();

virtualvoidf();

virtualvoidg();protected:

int

x;

int

y;};classNewA:publicA{public:

virtual~NewA();

virtualvoidf(){

/*新實(shí)現(xiàn)*/

}};classNewA{public:

NewA(A*oldA):pa(oldA){}

virtual~NewA();

virtualvoidf(){

/*新實(shí)現(xiàn)*/

}

virtualvoidg(){pa->g();}protected

:

A

*pa;};多個成員實(shí)現(xiàn)的同時變化classA{public:

virtual~A();

virtualvoidf();

virtualvoidg();protected:

int

x;

int

y;};classA{public:

A(

ImpF*f,ImpG*g

):pf(f),pg(g){}

virtual~A();

virtualvoidf(){

pf->f();}

virtualvoidg(){pg->g();}private:

ImpF*pf；

ImpG*pg；};classImpF{public:

virtual~ImpF();

vritualvoidf()=0;};classImpG{public:

virtual~ImpG();

vritualvoidG()=0;};classImpF1:publicImpF{public:

virtual~ImpF1();

vritualvoidf(){}

};classImpG1:publicImpG{略};兩個方向同時變化的適應(yīng)單一使用組合或繼承的不足結(jié)合組合和繼承的方式分離變化用組合關(guān)聯(lián)兩個方向的變化使單個方向的變化獨(dú)立出來(獨(dú)立變化)第一步：分離接口和實(shí)現(xiàn)class

A{public：

virutal~A();

virtualvoidf();

virtualvoidg();};

classImpA{public:

virtual~ImpA();

virtualvoidf();

virtualvoidg();protected:

int

x;

int

y;};第二步：用組合連接接口和實(shí)現(xiàn)class

A{public：

virutal~A（ImpA*p）:impA(p){}

virtualvoidf(){impA->f();}

virtualvoidg(){impA->g();}private:

ImpA

*impA;};classImpA{public:

virtual~ImpA();

virtualvoidf();

virtualvoidg();protected:

int

x;

int

y;};第三步：使接口和實(shí)現(xiàn)的變化獨(dú)立class

A{public：

virutal~A（ImpA*p）:impA(p){}

virtualvoidf(){impA->f();}

virtualvoidg(){impA->g();}private:

ImpA

*impA;};classImpA{public:

virtual~ImpA();

virtualvoidf();

virtualvoidg();protected:

int

x;

int

y;};class

NewA:pubicA{public：

virutal~NewA(ImpA*p):A(p){}

virtualvoidh(){