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53 lines (44 loc) · 884 Bytes
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Copy pathproxy.cpp
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53 lines (44 loc) · 884 Bytes
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/*!
* \brief. Proxy. Provide a surrogate or placeholder for
* another object to control access to it.
*
* Subject
* | |
* RealSubject <- Proxy
*/
#include <iostream>
class Subject {
public:
virtual void Request() = 0;
};
class RealSubject : public Subject {
public:
void Request() {
std::cout << "RealSubject Request" << std::endl;
}
};
class Proxy : public Subject {
public:
Proxy(): sub_(NULL) {}
void SetSubject(Subject* sub) {
sub_ = sub;
}
void Request() {
if (sub_ != NULL)
sub_->Request();
else
std::cout << "No Subject." << std::endl;
}
private:
Subject* sub_;
};
int main() {
Subject* sub = new RealSubject();
Proxy* p = new Proxy();
p->SetSubject(sub);
// Use a proxy to do something for the subject.
p->Request();
delete sub;
delete p;
return 0;
}