向上映射问题
#include <iostream>
using namespace std;
class A
{
public:virtual void print(void)
{
cout<<"A::print()"<<endl;
};
};
class B:public A
{
public:virtual void print(void)
{
cout<<"B::print()"<<endl;
};
};
class C:public A
{
public:void print(void)
{
cout<<"C::print()"<<endl;
};
};
void print(A a)
{
a.print();
}
int main(void)
{
A a,*pa,*pb,*pc;
B b;
C c;
pa = &a;
pb = &b;
pc = &c;
a.print();
b.print();
c.print();
pa->print();
pb->print();
pc->print();
print(a);//这里与上面，pa=&a的差别是什么？求解
print(b);
print(c);
return 0;
}
