Why not finally allow bracket-less top-level keywords?

[deadalnix]

Le 19/03/2012 18:41, F i L a écrit :
> deadalnix wrote:
>> It looks like a bad usage of inheritance. If you want to use these
>> methods, why not use composition ?
>>
>> It make no sense to use such an inherited class in a polymorphic
>> context, so why use inheritance at all ?
>
> Am I missing something about what you're saying? Having a final
> class is completely different than locking up it's functions:
>
> abstruct class Actor
> {
> void create() {}
> void update() {}
> }
>
> class Ship : Actor
> {
> final void create() {}
> final void update() {}
> final void fire() {}
> }
>
> class MotherShip : Ship
> {
> final void fireMissle() {}
> }
>
> void main() {
> Actor[] actors = [
> new Ship();
> new MotherShip();
> ];
>
> foreach (actor; actors) {
> actor.fire();
> }
> }
>
> If Ship was final simply because all it's methods where, then you
> couldn't inherit it's functionality into MotherShip.
>
>

That is totally broken design. The fact that mothership inherit from 
ship is a pretty good example of misusing inheritance. The fireMissle is 
useless unless you KNOW that you are manipulating a MotherShip, so you 
totally break all the abstraction the OOP could provide.