| Re: Call a method from a class [message #48146 is a reply to message #47588] |
Sat, 01 April 2006 01:24  |
Michael Galloy
Messages: 1114
Registered: April 2006
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Senior Member |
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vcarlos wrote:
> In some languages is possible to call methods from a Class, instead of
> a object. For instance, the class Messager could call a method
> reportError, message. This is useful when I just need a "instance" of
> that object and everybody takes advantage of that (I think that is
> similar to Singleton design pattern). Is there any way to the same in
> IDL? Or I should set up some kind of library procedures/functions and
> use through my program?
IDL doesn't provide you with a lot of extra syntax/features for
object-oriented programming, but you can get around most of what's
missing with good conventions and discipline.
For class methods, I usually just use the name of the class as a prefix
to a normal routine name. So for example, the class method sin of the
Math class would be:
function math__sin, x
The hard part is figuring out where to put it. I normally put my method
definitions and the member variable definition all in one file. If you
put the class method definitions in there too you have to instantiate an
object of that class in order to call them. So I usually put them in
their own files.
Class variables are a bit trickier, I usually use a COMMON block with a
special name defined in the math__define routine.
-Mike
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