You also can't pass a module around.
The module is just a namespace for methods that extend the RB language.
It's nice for things like "extends" and database stuff where you don't want
to have more than one instance floating around. I don't have a
hard-and-fast rule for when to use a module instead of a class. Many times
both are equally "correct" so it comes down to personal preference (and
other times hindsight proves that wrong and you might end up making
changes). Oftentimes when I find something that just doesn't fit into the
OBJECT world nicely I cram it into a module.
~joe
-----Original Message-----
From: realbasic-nug-bounces at lists dot realsoftware dot com
[mailto:realbasic-nug-bounces at lists dot realsoftware dot com] On Behalf Of
Dave
Crist
Sent: Friday, March 31, 2006 2:47 PM
To: REALbasic NUG
Subject: Classes vs Modules
I have been working this semester translating some useful numerical code
>from Java to RB... mainly because I thought it would make me more aware of
how I work and what I can do to make it better... plus it will wind up
giving me another language to do AI work in... that
said:
From Java, I am used to thinking about external libraries of code as
classes. The idea is neat, straightforward, and I like it. However, since
I have been using RB (mainly as a project/gui tool) I have always thought
that a module WAS an external class of sorts. Further reading about
modules, though, seems to indicate that the real goal of a module is just a
central location for a collection of methods
and properties and is not instantiable. But wait: that's just a
finalized class that inherits from Object, right?
Besides subclassing, is that the real difference. Is a module just a class
that doesn't inherit from anything and can't be instantiated or subclasses?
When would it be better to use a module than a class, then? Are there
performance issues? Anything else to be aware of?
Just throwing it out there. Thanks in advance,
dave
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