designPattern

1. Factory, FacoryMethod, AbstractFactory
2. visitor

---

Factory

---

Obj factoryMethod(type){
switch(type){
case 1: return Obj1;
case 2: return Obj2;
}
}

int main(){
Obj obj = factoryMethod(type1);
obj = factoryMethod(type2);
}

---

FactoryMethod

class IFactoryMethod {
Obj factoryMehod() = 0;
}
class CFactoryMethod1 : public IFactoryMethod{
Obj factoryMehod() {
return ObjectA(); }
}

class CFactoryMethod2 : public IFactoryMethod{
Obj factoryMehod() {
return ObjectB(); }
}

int main(){
IFactory *factory = new CFactoryMethod1();
fatory->method();

IFactory *factory = new CFactoryMethod2();
fatory->method();}

--

AbstractFactory

class IAbstractFactory {
Obj1 createObj1() = 0;
Obj2 createObj2() = 0;
}

class CAbstractFactory1 : public IAbstractFactory {
Obj1 createObj1() { return AAAObj1;}
Obj2 createObj2() { return AAAObj2;}
}

class CAbstractFactory2 : public IAbstractFactory {
Obj1 createObj1() { return BBBObj1;}
Obj2 createObj2() { return BBBObj2;} }

int main(){
IAbstractFactory *factory; Obj1 obj1;
Obj2 obj2;

factory = new CAbstractFactory1();
obj1 = factory->createObj1();
obj2 = factory->createObj2();

factory = new CAbstractFactory2;
obj1 = factory->createObj1();
obj2 = factory->createObj2();

}