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Abstract classes useful?
Message
De
02/06/2008 10:42:57
 
 
À
02/06/2008 10:24:39
Information générale
Forum:
Visual FoxPro
Catégorie:
Programmation Orientée Object
Versions des environnements
Visual FoxPro:
VFP 9 SP1
OS:
Windows XP SP2
Database:
Visual FoxPro
Divers
Thread ID:
01320973
Message ID:
01320988
Vues:
18
>Hi Peter,
>
>abstract classes are necessary to define the pure interface for your concrete classes. This way you can react to language- and property modifications. From VFP9 point of view this might not be necessary anymore, as there won't be any changes coming by MS, but for me that's no reason to change my behaviour.

I can imagine that at least one child from a base class is 'necessary' or at least useful. But if that child contains ALL that you need in a part of the application (apart from what must be set in the instance itself) then why declare it abstract?

>I remember someone said ( at DEVCON in Frankfurt) that you should use a unchanged inherited class i.e _textbox and a second class atextbox inherited from _textbox which defines additional properties and methods. But I have to admit, that I didn't like the work behind this, as I would have had to reconstruct too many classes...

What was the reasoning for such an 'empty' class?
Groet,
Peter de Valença

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