现在假设老师布置了作业,要班上同学做个汉诺塔程序。做好之后,大概是这样子:
void hanoi(int level, int from, int to, int temp)
{
printf("hanoi-tower\n");
}
void hanoi_norecursion(int level, int from, int to, int temp)
{
printf("hanoi-tower2\n");
}
int main()
{
}
现在要把代码和别的同学的合并到一起,别的同学做程序很可能也起了相同的名字,放到一起就会起冲突了。最好的方法是把它封装到一个类里。就象下面这样:
class aaaHomework{
public:
void hanoi(int level, int from, int to, int temp)
{
printf("hanoi-tower\n");
}
void hanoi_norecursion(int level, int from, int to, int temp)
{
printf("hanoi-tower2\n");
};
class test {
public:
static int main(aaaHomework &a) {
}
};
friend class aaaHomework::test;
};
这样所有同学的作业就可以都放到同一个程序里了。而老师批改作业也变得简单了:
template <class Homework>
void checkHomework(Homework &work)
{
Homework::test::main(work);
}
int main()
{
aaaHomework aaa;
sssHomework sss;
ddddHomework dddd;
...
checkHomework(aaa);
checkHomework(sss);
checkHomework(dddd);
...
}