On Saturday, August 3, 2002, at 03:27 , Stacy Young wrote:
> Well I'm extending a current CFC that returns an object (struct of
> resultsets - no worries not for remote use)
>
> This wrapper CFC manages the resultset in session scope and carries a few
> local methods I can execute on this subset of data...say for example I
> wanted to re-sort one of the recordsets etc...
This makes a great illustration for why inheritance is not always the
right choice. When we say B extends A, we should do iff (if and only if) B
is-a A. If that relationship doesn't really hold true, then we should find
another way to do it, usually by aggregation - B contains A, i.e., B has a
data member of type A.
Quite often something that looks like it ought to be:
A
B extends A
C extends A
D extends A
is better implemented as:
A
X (contains A instance)
B extends X
C extends X
D extends X
"If you're not annoying somebody, you're not really alive."
-- Margaret Atwood
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