>>> [EMAIL PROTECTED] 12/08/03 03:04AM >>>
> Another is that i'm beginning to see that inheritance is "nearly useless" in CF -
> well, that's a broad statement, but for the most part it's kinda true, because all
> that is inherited is the methods. The instance data isn't inherited, because it's
> only
> class inheritance, not object inheritance. So if you need the instance data in the
> subtypes, and you probably will, you still need to pass it down to the subtype using
> ... you got it, composition.
Component data (vars in the "Variables" scope) is inherited by "child" components. I
am using it to good effect in a Unit Testing system that I work with.
Inheritance isn't always "evil" or useless - you should just make sure it is the best
solution for your problem rather than jumping into it without much thought. There are
some situations where it provides a very elegant solution over other options.
<cfcomponent name="Parent" >
<cfset Variables.Name = "I'm an object in a family" >
</cfcomponent>
<cfcomponent name="Child" extends="Parent" >
<cffunction name="GetName" >
<cfreturn Variables.Name > // returns "I'm an object in a family"
</cffunction>
</cfcomponent>
Jon
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