Derived::Derived(const Base&) and Derived& operator=(const Base&)

[developereo]

Hi folks,

Can somebodyshed some light on this problem?

class Interface {
protected:
Interface() { ...}
virtual ~Interface() { ... }

public:
virtual method() = 0;
}

class Impl1: public Interface {
public:
Impl() { ... }
Impl(const Interface&); // problem 1
virtual ~Impl() { ... }
Impl& operator=(const Interface&); // problem 2
virtual method() { ... }
}

The problem is that the compiler (VC 2005) insists on generating
Impl1(const Impl1&) // copy constructor
and
Impl& operator=(const Impl1&) // default assignment operator

The problem is I do not want these methods. I want any Impl to be
able to construct/assign itself from any (other) Impl satisfying the
Interface. That's the whole point of having an Interface. I
shouldn't need these methods. The compiler should be able to use my
methods since every Impl is also an Interface, no?

Thanks,
J.

[myork]

The problem is that the compiler (VC 2005) insists on generating
Impl1(const Impl1&) // copy constructor
and
Impl& operator=(const Impl1&) // default assignment operator

The problem is I do not want these methods.

Declare them private and do not provide an implementation:

class Impl1: public Interface
{
private:
Impll(const Impll& copy); // Not implemented.
Impll& operator(const Impll& copy); // Not implemented.

<<STUFF>>
};