"Powell, Gary" <powellg@amazon.com> writes:

One other thing that makes writing base class and derived classes easier is to add this to the ref struct

class X { .... private: struct ref { ref (X *rhs) : p (rhs) {}

template<class T> // new ref (T *rhs) : p(rhs) {} // compiles if T is derived from X.

X *p; };

..... };

Then in the derived class you can call:

class Y : public X {

....

Y(ref rhs) : X (rhs.p) // no cast needed to call X::ref , id(++cnt) , owner(true) { .... }

.... };

Anyway the more I play with this the better I like it.

If Rani is right about the reference binding I'd like to find some way to library-ize this idiom, so your "ref" converting constructor will come in handy. BTW, you don't need the other "ref" constructor anymore. -- Dave Abrahams Boost Consulting www.boost-consulting.com