Re: Subclassing

FROM : j o a r
DATE : Sat Apr 19 01:02:00 2008

On Apr 18, 2008, at 2:56 PM, K. Darcy Otto wrote:

> The only reason to subclass Deduction (with SDeduction) and then 
> DeductionLine (with SDeductionLine) is to get an SDependency 
> object.  Is there an easier way?  I suppose I could just copy the 
> Dependency class files and then modify it for this particular 
> project; but I was hoping for a different way.  Thanks.




I think that what you would typically do is either to add:

   "-[DeductionLine initWithDependency:]"

   // Where Deduction line doesn't know, or care about, what particular
   // type of object is being passed, as long as it is either a subclass 
of
   // Dependency, or it conforms to a specific protocol.

Or something like:

   "-[DeductionLine initWithProperty:]"

   // Where the caller doesn't know about different Dependency classes,
   // and instead specify some type of configuration / context property, 
to
   // which the DeductionLine responds by instantiating an appropriate
   // Dependency subclass.


j o a r