设计模式——原型模式

一、任务

向量的原型

完成数学中向量的封装，其中，用指针和动态申请支持向量长度的改变，使用浅克隆和深克隆复制向量类，比较这两种克隆方式的异同。

二、类图

三、代码

 1、深克隆（C++）

#include <iostream>
#include <string.h>
using namespace std;

class Vector {
private:
    int x1;
    int y1;
    int x2;
    int y2;
public:

    Vector(int x1, int y1,int x2,int y2)//构造函数
    {
        x1 = x1;
        y1 = y1;
        x2 = x2;
        y2 = y2;
        cout << "构造函数" << endl;
    }
    Vector(const Vector& p)//拷贝构造函数
    {
        
        x1 = p.x1;
        y1 = p.y1;
        x2 = p.x2;
        y2 = p.y2;
        cout << "进行深克隆" << endl;
    }
    Vector() {

    }
    ~Vector()
    {
        cout << "析构函数 ..." << "(" << x1 << ", " << y1 << ")—>(" << x2 << "," << y2 << ")" << endl;
        
    }
    void dispaly()
    {
        cout<<"(" << x1<< ", " << y1<<")—>("<<x2<<","<<y2<<")" << endl;
    }
    void setX1(int x)
    {
        x1 = x;
    }
    void setY1(int x)
    {
        y1 = x;
    }
    void setX2(int x)
    {
        x2 = x;

    }
    void setY2(int x)
    {
        y2 = x;
    }
};
int main()
{
    Vector *p1=new Vector();
    p1->setX1(1);
    p1->setX2(4);
    p1->setY1(7);
    p1->setY2(3);
    p1->dispaly();
    cout << "进行深克隆" << endl;
    Vector *p2(p1);

   p2->dispaly();
   cout << "判断p1==p2...." << endl;
   if (p1 == p2) {
       cout << "true" << endl;
   }
   else {
       cout << "flase" << endl;
   }
    return 0;
}

2、浅克隆（C++）

#include <iostream>
using namespace std;

//接口
class Vector
{
public:
    Vector() {}
    virtual ~Vector() {}

    virtual Vector* Clone() = 0;
};

//实现
class ConcreteVector : public Vector
{
private:
    int x1;
    int y1;
    int x2;
    int y2;
    int m_counter;
public:
    ConcreteVector() :m_counter(0) {}
    virtual ~ConcreteVector() {}

    //拷贝构造函数
    ConcreteVector(const ConcreteVector& rhs)
    {
        m_counter = rhs.m_counter;
    }
   
    void set(int a,int b,int c,int d) {
        x1 = a;
        y1 = b;
        x2 = c;
        y2 = d;

    }
    //复制自身
    virtual ConcreteVector* Clone()
    {
        //调用拷贝构造函数
        return new ConcreteVector(*this);
    }

    void dispaly()
    {
        cout << "(" << x1 << ", " << y1 << ")—>(" << x2 << "," << y2 << ")" << endl;
    }
    
};

int main()
{
    //生成对像
    ConcreteVector* conProA = new ConcreteVector();
    conProA->set(14, 4, 2, 8);
    
    //复制自身
    ConcreteVector* conProB = conProA->Clone();
    conProB->set(14, 4, 2, 8);
    cout << "深克隆前...." << endl;
    conProA->dispaly();
    cout  << endl;
    cout << "深克隆后...." << endl;
    conProB->dispaly();
    cout << "判断p1==p2...." << endl;
    if (conProA == conProB) {

        cout << "true" << endl;
    }
    else {
        cout << "flase" << endl;
    }
    delete conProA;
    conProA = NULL;

    delete conProB;
    conProB = NULL;

    return 0;
}