#include <iostream>

struct A
{
    A(){ std::cout << "A default ctor" << std::endl; }
    A(A const&){ std::cout << "A copy ctor" << std::endl; }
    virtual ~A() = 0;
}; A::~A(){}

struct B : virtual A
{
    B(){ std::cout << "B default ctor" << std::endl; }
    B(B const&o) : A(o) { std::cout << "B copy ctor" << std::endl; }
    virtual ~B() = 0;
}; B::~B(){}
struct C : virtual A
{
    C(){ std::cout << "C default ctor" << std::endl; }
    C(C const&o) : A(o) { std::cout << "C copy ctor" << std::endl; }
    virtual ~C() = 0;
}; C::~C(){}

struct D : B, C
{
    D(){ std::cout << "D default ctor" << std::endl; }
    D(D const&o) : A(o), B(o), C(o) { std::cout << "D copy ctor" << std::endl; }
    virtual ~D() = 0;
}; D::~D(){}

struct E : D
{
    E(){ std::cout << "E default ctor" << std::endl; }
    E(E const&o) : A(o), D(o) { std::cout << "E copy ctor" << std::endl; }
    virtual ~E(){}
};

int main()
{
    E e;
    std::cout << std::endl << std::endl;
    E e2(e);
}