subclass to base class but not subclass pointer to base class pointer?

[John Colvin]

On Saturday, 20 April 2013 at 17:42:02 UTC, Namespace wrote:
> And no, the equivalent version would use 'A' as return type of 
> 'get', not 'A*'.

Sorry, no.

//C++
A* get(unsigned int id);

//D
A get(unsigned int id);

Those are the equivalent declarations. A reference is, for these 
intents and purposes, a pointer and D classes are reference 
types. In D, "get" returns a reference to an object, i.e. a 
pointer to an object.

C++ does not have polymorphic pointers to pointers to class 
objects, for good reason (see my original reply). AFAIK the same 
reasons apply to D, hence D has no polymorphic pointers to 
references to class objects.