#include <iostream>

using namespace std;

#define DESTROY_POINTER(ptr) if (ptr) { delete ptr; ptr = NULL; }

class TemplateMethod

{

public:

    void AlgorithmA() { Step1(); Step2(); Step3(); }

    void AlgorithmB() { Step3(); Step2(); Step1(); }

protected:

    virtual void Step1()=;

    virtual void Step2()=;

    virtual void Step3()=;

};

class ConcreteTemplateA : public TemplateMethod

{

public:

    ConcreteTemplateA() {}

    ~ConcreteTemplateA() {}

protected:

    void Step1() { cout<<"ConcreteTemplateA::Step1"<<endl; }

    void Step2() { cout<<"ConcreteTemplateA::Step2"<<endl; }

    void Step3() { cout<<"ConcreteTemplateA::Step3"<<endl; }

};

class ConcreteTemplateB : public TemplateMethod

{

public:

    ConcreteTemplateB() {}

    ~ConcreteTemplateB() {}

protected:

    void Step1() { cout<<"ConcreteTemplateB::Step1"<<endl; }

    void Step2() { cout<<"ConcreteTemplateB::Step2"<<endl; }

    void Step3() { cout<<"ConcreteTemplateB::Step3"<<endl; }

};

int main(int argc, char *argv[])

{

    TemplateMethod* pTemplate = NULL;

    pTemplate = new ConcreteTemplateA;

    pTemplate->AlgorithmA();

    DESTROY_POINTER(pTemplate);

    pTemplate = new ConcreteTemplateB;

    pTemplate->AlgorithmB();

    DESTROY_POINTER(pTemplate);

    return ;

}