原型模式

原型模式 当创建给定类的实例的过程很昂贵或很复杂时，就是用原型模式（Prototype Pattern）

#include <iostream>

using namespace std;


class Prototype {
public:
    Prototype() {}
    virtual ~Prototype() {}
    virtual Prototype * Clone() = 0;
};

class ConcretePrototype : public Prototype {
public:
    ConcretePrototype() : m_counter(0) {}
    virtual ~ConcretePrototype() {}

    ConcretePrototype(const ConcretePrototype &rhs) {
        m_counter = rhs.m_counter;
    }
    virtual ConcretePrototype *Clone() {
        return new ConcretePrototype (*this);
    }
private:
    int m_counter;
};


int main(int argc, char **argv)
{
    ConcretePrototype *conProA = new ConcretePrototype();
    ConcretePrototype *conProB = conProA->Clone();

    delete conProA;
    delete conProB;
    return 0;
}