[fpc-devel] class abstract, class sealed implementation. please review.

["Vinzent Höfler"]

Paul Ishenin <ip at kmiac.ru>:

> TBasicPhone = class abstract
> TCellularPhone = class(TBasicPhone)
> TSatelitePhone = class(TBasicPhone)
> TDialPhone = class(TBasicPhone)
> ...
> TNokiaPhone = class(TCellularPhone)
> TNokia37xxPhone = class(TNokiaPhone)
> TNokia3720Phone = class sealed(TNokia37xxPhone)
> 
> TBasicPhone is ofcource an abstract class. It can have some basic fields 
> like color, weight, dimensions, ...
> TNokia3720Phone is a final product which can't have any further 
> derivations. It is logically to mark this class as sealed to prevent 
> ocasional errors.

And what is with the TNokia3720Phone_DeluxeEdition which is basically the same as TNokia3720Phone, but with some enhanced features?

> Why to limit other developers?

Precisely. ;)


Vinzent.

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