Factory工厂模式

#include <iostream>using namespace std;//基类。class Parent{public:    virtual void Printf()=0;};class Child1 : public Parent{public:    void Printf()    {        cout << "Child1::Printf()" << endl;    }};class Child2 : public Parent{public:    void Printf()    {        cout << "Child2::Printf()" << endl;    }};class Child3 : public Parent{public:    void Printf()    {        cout << "Child3::Printf()" << endl;    }};//工厂类。template<typename Type>class DoWhatBase{public:    virtual Type* GetBase() = 0;};template<typename Type>class Dowhat : public DoWhatBase<Type>{public:    Type* GetBase()    {        return new Type();    }};int main(){    DoWhatBase<Child1> *q = new Dowhat<Child1>();    Parent *p = q->GetBase();    p->Printf();    return 0;}//特点一：定义创建对象的接口，封装了对象的创建。//特点二：使具体化类的工作延迟到子类中。