Hi Tom,

On Thu, 2008-05-08 at 09:07 +0100, Thomas Beale wrote:
> >   
> sure - it is just like OO code for subclasses - you don't include copies 
> of the methods and attributes already present in the parent, you only 
> include those being overridden or added. Doing otherwise creates a 
> maintenance problem, since child class B, containing copies of class A's 
> unchanged methods X and Y is out of date as soon as class A is modified 
> to change or remove X or Y.

Correct.  In software development you use a version control system to
keep everyone up to date.  If I change class A, you get a notice and are
responsible for making any changes to your child class B.  But when we
release a complete version of an application we do not send out .diffs
for our users to assemble.  

Cheers,
Tim

  
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