1.UML

2.代码

#include <iostream>
using namespace std;
 
class Subject{
public:
    virtual void Request() = 0;
};
 
class RealSubject:public Subject
{
public:
    virtual void Request(){
        cout << "RealSubject" << endl;
    }
};
class Proxy:public Subject
{
public:
    RealSubject *real = nullptr;
    virtual void Request(){
        if(real == nullptr){
            real = new RealSubject();
        }
        real->Request();
    }
};
 
class Client{
public:
    void dothing(Subject *object){
        object->Request();
    }
};
 
int main()
{
    Client *c = new Client();
    Proxy *p = new Proxy();
    c->dothing(p);
    cout << "--endl--" << endl;
    return 0;
}

运行结果：

RealSubject
--endl--

练习：追求者

UML图

#include <iostream>
using namespace std;
 
class Songliwu{
public:
    virtual void song_wawa() = 0;
    virtual void song_huahua() = 0;
    virtual void song_qiaokeli() = 0;
};
class MM{
public:
    string name;
    MM(string _name):name(_name){
 
    }
};
 
class Persuit:public Songliwu
{
public:
    MM *mm;
    Persuit(MM *_mm):mm(_mm){
 
    }
    void song_wawa(){
        cout << mm->name <<":送娃娃" << endl;
    }
    void song_huahua(){
        cout << mm->name <<":送花花" << endl;
    }
    void song_qiaokeli(){
        cout << mm->name <<":送巧克力" << endl;
    }
};
class Proxy:public Songliwu
{
public:
    Persuit *gg;
    Proxy(MM *mm){
        gg = new Persuit(mm);
    }
    void song_wawa(){
        gg->song_wawa();
    }
    void song_huahua(){
        (*gg).song_huahua();
    }
    void song_qiaokeli(){
        (*gg).song_qiaokeli();
    }
};
 
int main(void)
{
    MM *mm = new MM("韩梅梅");
    Proxy p(mm);
    p.song_wawa();
    p.song_huahua();
    p.song_qiaokeli();
    cout << "--endl--" << endl;
    return 0;
}

运行结果：

韩梅梅:送娃娃
韩梅梅:送花花
韩梅梅:送巧克力
--endl--

参考：https://lkmao.blog.csdn.net/article/details/128950278?ydreferer=aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1ZW5pX3poYW8vY2F0ZWdvcnlfMTIxNDI1MDUuaHRtbA%3D%3D