SPUG: Class::Multimethod Question

[Asim Jalis]

On Thu, Jul 06, 2000 at 12:15:28PM -0700, Andy Jacobs wrote:
> You seem to be declaring both "new" functions with the same parameters
> (i.e., '$').  From memory of the talk last night, I think the syntax should
> be more like:
> 	multimethod new => (ObjectA) => sub [...]

Except this is a constructor. So you have to call it before you have
an instance of the object to call it with. 
 
> But in this case, as your examples show, there is enough information when
> calling your constructor to distinguish between ObjectA and ObjectB without
> using multimethods.  The multimethod technique would make more sense if you
> were passing additional parameters to the constructor, and wanted to choose
> ObjectA or ObjectB based on the types of those parameters.

The multimethods technique can potentially be quite useful with
constructors.  It is common to provide one constructor which takes
no parameters and then provide other constructors which over-ride the
defaults.

Asim

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