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#include <iostream>
class A1 {
friend class B;
public:
virtual void foo() {};
};
class A2 : public virtual A1 {friend class B;};
class A3 : public virtual A1, private A2 {friend class B;};
class B
{
public:
B(A1* a) : itsA(dynamic_cast<A2*>(a)) {};
A2* itsA;
};
int main()
{
A1* a=new A3;
B b(a);
if (b.itsA)
std::cout << "cast ok" << std::endl;
else
std::cout << "cast failed" << std::endl;
return 0;
}
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