原型模式

原型模式(Prototype)

Definition：用原型实例指定创建对象的种类，并且通过拷贝这些原型创建新的对象。通俗来讲，从一个对象创建另外一个可定制的对象，不需要知道任何创建的细节。

#include <iostream>
#include <string>

using namespace std;

/* Prototype abstract Class */
class Prototype {
public:
    virtual Prototype* clone() = 0;
    virtual void display() = 0;
};

/* 原型模式类的实现 */
class Resume: public Prototype {
public:
    Resume(string name, int id): m_name(name), m_id(id) {}
    Resume(const Resume &rm);
    void display();
    Prototype* clone();
private:
    string m_name;
    int m_id;
};

//Important, copy construct function
Resume::Resume(const Resume &rm) {
    this->m_id = rm.m_id;
    this->m_name = rm.m_name;
}

void Resume::display() {
    cout<<"my id is "<<this->m_id<<", my name is "<<this->m_name<<endl;
}

//Important, clone function
Prototype* Resume::clone() {
    return new Resume(*this);
}

/* 测试 */
void main() {
    Prototype* r1 = new Resume("zhao", 1);
    Prototype* r2 = r1->clone();
    Prototype* r3 = r2->clone();

    r1->display();
    r2->display();
    r3->display();

    delete r1;
    delete r2;
    delete r3;

    system("pause");
}

/* Result

my id is 1, my name is zhao
my id is 1, my name is zhao
my id is 1, my name is zhao

*/

Tips：

支持复制(clone function)当前对象的模式.

重要函数  拷贝构造函数和clone函数