c++ - Class templates and casting -

so i'm trying write copy constructor class e such every int x each class , assign counterpart. how cast right side?

class { public:     int x; };  class b: public virtual { public:     int x; };  class c: public virtual { public:     int x; };  class d : public b, public c { public:     int x; };  class e: public d { public:     int x;      e(const e& e)     {         e::x = (e)e.x // problem         d::x = ?         c::x = ?         b::x = ?         a::x = ?     } }; 

you not need cast int assign int. do:

self->x = ((e)e).x; d::x = ((d)e).x;