#include <iostream>
using namespace std;

class Handle {
public:
 virtual ~Handle() { }

 virtual void HandleRequest() = 0;

 void SetSuccessor(Handle *succ) {
 _succ = succ;
 }

 Handle* GetSuccessor()const {
 return _succ;
 }

protected:
 Handle() { _succ = nullptr; }

 Handle(Handle* succ) {
 _succ = succ;
 }
private:
 Handle* _succ;
};

class ConcreteHandleA :public Handle {
public:
 ConcreteHandleA() { }

 ConcreteHandleA(Handle* succ)
 :Handle(succ) {
 }

 void HandleRequest() {
 if (this->GetSuccessor() != 0) {
 cout << "ConcreteHandleA--Successor" << endl;
 GetSuccessor()->HandleRequest();
 }
 else {
 cout << "ConcreteHandleA::HandleRequest" << endl;
 }
 }
};

class ConcreteHandleB :public Handle {
public:
 ConcreteHandleB() { }

 ConcreteHandleB(Handle* succ)
 :Handle(succ) {
 }

 void HandleRequest() {
 if (this->GetSuccessor() != 0) {
 cout << "ConcreteHandleB--Successor" << endl;
 GetSuccessor()->HandleRequest();
 }
 else {
 cout << "ConcreteHandleB::HandleRequest" << endl;
 }
 }
};

int main() {
 Handle *h1 = new ConcreteHandleA();
 Handle *h2 = new ConcreteHandleB(h1);// or h1->SetSuccessor(h2);
 h2->HandleRequest();

 delete h1;
 delete h2;

 return 0;
}