Thanks David.
How, in the case of boggis, which can handle either a string or an array, can
it determine which it's been handed. datatype() doesn't seem to help with
this.
im
------ Original Message ------
Received: 09:05 AM COT, 05/07/2009
From: David Ashley <david.ashley....@gmail.com>
To: Open Object Rexx Users <oorexx-users@lists.sourceforge.net>
Subject: Re: [Oorexx-users] Polymorphic(?) methods
> Ian S. Worthington wrote:
> > Hi --
> >
> > In many other OO languages I can write (polymorphic, iirc?) methods which
have
> > the same name but different types (and numbers) of arguments eg
> >
> > boggis( string )
> > boggis( array )
> >
> > I can't find how to do this in oorexx, or indeed if its possible.
> >
> > Failing that, given that boggis( thing ) is happy to accept both a string
> > object or an array, is there a way for boggis to determine what its been
> > handed so it can take the appropriate action?
> >
> >
> > ian
> >
> This is actually easy. The main thing to understand is that a method can
> receive any number or types of arguments. The method must decide what to
> do wit the arguments. For instance:
>
> ::method mymethod
> if arg() = 3 then do
> use arg t1, t2 ,t3
> end
> else do
> use strict arg t1, t2
> end
> if t1~datatype('W') then ...
> else ...
>
> and so forth. There is no need, and in fact no way, to define multiple
> methods with the same name with different signatures (signatures do not
> exist in ooRexx). The method itself is the sole arbitrator of how
> arguments are interpreted.
>
> David Ashley
> ooRexx Team
>
>
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