Re: Definitions

From: rackri (rackri_at_yahoo.it)
Date: 10/21/03 

Date: 21 Oct 2003 14:22:00 -0700

I'm trying to understand OO at my best, and these
concepts are keywords in some articles that I read.
Your post is a very useful point from which I can
continue my study.
Thank you very much! -- Roberto

zix6@yahoo.com (Zix) wrote in message news:<3f1e5480.0310200808.25e16f9@posting.google.com>...
> rackri@yahoo.it (rackri) wrote in message news:<7a2f224b.0310190050.39f26b50@posting.google.com>...
> > Hi all,
> >
> > can you please help me to understand these concepts:
> >
> > - delegation
> > - forwarding
> > - indirection
> > - redirection
> > - double-dispatch
> >
> > Thanks -- Roberto
>
> let's tackle a couple of these:
>
> delegation: is a design time tradeoff between inheritance from or
> "delegating" the desired functionality to another class. In building
> a car object, you would delegate the braking functionality to a brake
> object rather than inheriting off a brake class.
>
> forwarding: not too sure about this one, but I take it to mean serving
> as an intermediary between objects where the calls to an object get
> routed or "forwarded" to another object. A Proxy (Design
> Patterns,Gamma,etal) eventually "forwards" calls to the object that it
> is stanging in for.
>
> indirection: is a low level programming construct in which a storage
> location, instead of holding a value, contains an address to another
> location where the value is stored.
>
> redirection: not really sure about this one, but in C++/C you can
> redirect things like ostreams to stdout, stderr, files,etc. So I
> would say that redirection is the ability to re-route information
> to/from a source/sink.
>
> double-dispatch: Alexandrescu defines (mulimethods/multiple dispatch)
> as the ability to dispatch a function call based on the dynamic types
> of multiple objects involved in the call (Modern C++ Design,
> pp,263-264). 2 objects gives you double dispatch. The distinction
> between types can be made either at compile or run-time.
>
> oops, I tackled all of these, this sort of smells as a homework
> problem (note to OP, let us see your take on these, you'll get a
> better response), but I'm interested as to what others have to say.

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