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#include <iostream>
using namespace std;
class A
{
public:
virtual void operator ++ ()=0;
virtual void Print()=0;
};
class B:public A
{
public:
B():a(0){}
void operator ++ ()
{
cout<<"class B operator ++"<<endl;
a++;
}
void Print()
{
cout<<a<<endl;
}
private:
int a;
};
class C:public A
{
public:
C():a(0){}
void operator ++ ()
{
cout<<"class C operator ++"<<endl;
a++;
}
void Print()
{
cout<<a<<endl;
}
private:
int a;
};
int main()
{
A* p1=new B();
++(*p1);
p1->Print();
A* p2=new C();
++(*p2);
p2->Print();
}
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