C++ 디자인 패턴과 프로토타입 패턴에 대한 간략한 소개

[code]int main(){
    //生成对象
    ConcretePrototype * conProA = new ConcretePrototype();
    //复制自身
    ConcretePrototype *conProB = conProA->Clone();   //先clone后调用拷贝构造函数， Output: clone constructor

    delete conProA;
    conProA = NULL;

    delete conProB;
    conProB = NULL;

    return 0;
}

[code]//接口
class Prototype{
public:
    Prototype(){}
    virtual ~Prototype(){}
    virtual Prototype *Clone() = 0;
};

//实现
class ConcretePrototype: public Prototype{
public:
    ConcretePrototype(): m_counter(0) {}
    virtual ~ConcretePrototype(){}
    //拷贝构造函数
    ConcretePrototype(const ConcretePrototype &rhs){
        std::cout << "constructor\n";
        m_counter = rhs.m_counter;
    }

    //复制自身
    virtual ConcretePrototype *Clone(){
        //调用拷构造函数
        std::cout << "clone\n";
        return new ConcretePrototype(*this);
    }

private:
    int m_counter;
};