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#include <iostream>
using namespace std;
 
struct Parent1
{
    virtual void f()
    {
        cout << "\nParent1::f";
    }
};
struct Parent2
{
    virtual void g()
    {
        cout << "\nParent2::g";
    }
    virtual void z()
    {
        cout << "\nParent2::z";
    }
};
struct Child : public Parent1, public Parent2
{
    virtual void h()
    {
        cout << "\nChild::h";
    }
};
 
int main()
{
    Child obj;
    Parent2 * p2 = static_cast<Parent2*>(static_cast<Parent1*>(&obj));
    p2->z();
    return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:33:69: error: invalid static_cast from type ‘Parent1*’ to type ‘Parent2*’
     Parent2 * p2 = static_cast<Parent2*>(static_cast<Parent1*>(&obj));
                                                                     ^

Standard output is empty