Subj : Re: Typecasting question
To   : borland.public.cpp.borlandcpp
From : Greg Chicares
Date : Wed Dec 15 2004 10:31 am

On 2004-12-15 2:59 AM, wmd wrote:
 >
> "Greg Chicares" <chicares@mindspring.com> wrote in message
> news:41bf9bf0$1@newsgroups.borland.com...
> 
[OP wants to invoke a function in one class on an object
of another, using a pointer to member function]
> 
>> declare [the function] in a base class, and use
>> it for classes that derive from that base.
> 
> use mfc
> 
> class X: public CObject {
> .............
> };

Most classes in the mfc framework are derived from a common
base class, CObject. But if that class doesn't declare the
function that the OP wants to use, for instance because he
wrote it himself, then I don't think it can help him here.

The idea of deriving everything from a common base class
is generally considered poor design in C++, BTW. Really old
libraries may have used that architecture, for instance, as
a way of implementing containers without using templates.
But over the years we've learned that C++ favors a forest
instead of a tree topology.

.