Proxy Design Pattern proxy Design Mode

Proxy design mode. This mode is mostly used for server clients and the like. It is very complicated to think of, but this design mode is very simple.

A class calls a function of another class. The customer calls a class, and the actual work is done by another class.

Code that reflects this design pattern:

# Include <stdio. h> class realobj {public: Virtual void handlereq () = 0 ;}; class dosomething: Public realobj {public: void handlereq () {puts ("Actually, I will do the rest... ") ;}}; class proxy {realobj * subject; public: proxy (realobj * sub): subject (sub) {} virtual ~ Proxy () {If (subject) delete subject;} void request () {puts ("proxy request... using other object to requese. "); Subject-> handlereq (); // just simply call a function, using another object .}}; int main () {realobj * sub = new dosomething; proxy P (sub); p. request (); Return 0 ;}

Run: