模版方法模式是指把不变的行为搬移到超类，去除子类中的重复代码的一种模式，它提供了很好的代码复用平台。
有时候遇到一系列相同步骤执行的过程（具体实现可能不同）时，可以考虑模版方法模式。把不变的行为搬移到单一的地方。
举例：
#include <stdio.h>
using namespace std;
class Paper
{
public:
void Task1()
{
printf("Paper::task1\n");
Answer1();
}
void Task2()
{
printf("Paper::task2\n");
Answer2();
}
virtual void Answer1()
{
printf("Paper::Answer1\n");
}
virtual void Answer2()
{
printf("Paper::Answer2\n");
}
};
class PaperA : public Paper
{
public:
virtual void Answer1()
{
printf("PaperA::Answer1\n");
}
virtual void Answer2()
{
printf("PaperA::Answer2\n");
}
};
class PaperB : public Paper
{
public:
virtual void Answer1()
{
printf("PaperB::Answer1\n");
}
virtual void Answer2()
{
printf("PaperB::Answer2\n");
}
};
int main()
{
Paper* a = new PaperA();
a->Task1();
a->Task2();
delete a;
a = NULL;
Paper* b = new PaperB();
b->Task1();
b->Task2();
delete b;
b = NULL;
return 0;
}
