TemplateMethod模板方法模式

关键在于把一个算法分解为几个非常固定的步骤，顺序是可以在子类中得到改变的

#include <cstdlib>
#include <iostream>

using namespace std;

class Template
{
public:
  virtual ~Template(){cout<<"Tempalte基类析构"<<endl;}
  void BiaoBai()
  {
    SayOneWord();
    SayTwoWord();
    SayThreeWord();
  }
  virtual void SayOneWord() = 0;
  virtual void SayTwoWord() = 0;
  virtual void SayThreeWord() = 0;
};
class Chinese:public Template
{
public:
  virtual ~Chinese(){cout<<"Chinese基类析构"<<endl;}
  virtual void SayOneWord(){cout<<"I ";}
  virtual void SayTwoWord(){cout<<"LOVE ";}
  virtual void SayThreeWord(){cout<<"YOU!"<<endl;}
};
class English:public Template
{
public:
  virtual ~English(){cout<<"English基类析构"<<endl;}
  virtual void SayOneWord(){cout<<"我";}
  virtual void SayTwoWord(){cout<<"爱";}
  virtual void SayThreeWord(){cout<<"你！"<<endl;}
};
void Do(Template* pBoy)
{
  pBoy->BiaoBai();
}
int main(int argc, char *argv[])
{
    Template* pOne = new Chinese;
    Do(pOne);
    delete pOne;
    pOne = new English;
    Do(pOne);
    delete pOne;
    system("PAUSE");
    return EXIT_SUCCESS;
}