#include<iostream>

struct A{
A(){std::cout<<"Adef\n";}
A(const A&){std::cout<<"Acpy\n";}
~A(){std::cout<<"~A\n";}
};

struct B:public A{
B(){std::cout<<"Bdef\n";}
B(const B&m){std::cout<<"Bcpy\n";}
~B(){std::cout<<"~B\n";}
};

struct C:public A{
C(){std::cout<<"Cdef\n";}
C(const C&m):A(m){std::cout<<"Ccpy\n";}
~C(){std::cout<<"~C\n";}
};

int main()
{
    B b;     // Adef Bdef
    C c;     // Adef Cdef
    B b1(b); // Adef Bcpy  ?????
    C c1(c); // Acpy Ccpy  !!!!!
}            // ~C ~A ~B ~A ~C ~A ~B ~A