Template_Method
4704 ワード
#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()=0;
virtual void Step2()=0;
virtual void Step3()=0;
};
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 0;
}