#include <iostream>

struct pad {
    int x;
    
    virtual ~pad() {}
};

struct b {
    int x;
};

struct vb {
    int x;
    
    virtual ~vb() {}
};

struct d : pad, b, vb {};

void operator delete( void *p ) {
    std::cout << "free " << p << '\n';
}

int main() {
    std::cout << "With virtual destructor:\n";
    d *p = new d;
    std::cout << "allocate " << p << ", delete " << static_cast< vb * >( p ) << '\n';
    delete static_cast< vb * >( p );

    std::cout << "With plain destructor:\n";
    p = new d;
    std::cout << "allocate " << p << ", delete " << static_cast< b * >( p ) << '\n';
    delete static_cast< b * >( p );
}