Re: A Change In Terminology: Monomorphic Objects. Polymorphic Objects

From:

brangdon@cix.co.uk (Dave Harris)

Newsgroups:

comp.lang.c++.moderated

Date:

3 Jan 2007 09:25:03 -0500

Message-ID:

<memo.20070103083823.2340B@brangdon.cix.compulink.co.uk>

jaibuduvin@gmail.com (Le Chaud Lapin) wrote (abridged):

Most of my own work uses dynamic polymorphism only where the
implementation can vary at run-time, or at least at load-time, and
that is fairly rare. (However, my classes do tend to be
heap-allocated and forward-declared, for dependency management.)

Do you have an example of code where you have done this?

In headers, instead of code like:

     #include "MySpecialControl.h"

     struct MyDialog : Dialog {
         MySpecialControl m_control;
         // ...
     };

I am likely to have:

     struct MySpecialControl;

     struct MyDialog : Dialog {
         MySpecialControl *m_pControl;
         // ...
     };

So that client code can #include "MyDialog.h" without getting a dependency
on MySpecialControl.h. This kind of dependency management is important for
large projects.

-- Dave Harris, Nottingham, UK.

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