|Re: abstract with copy inheritance [message #984720 is a reply to message #574509]
||Wed, 14 November 2012 23:05
| Stephan Herrmann
Registered: July 2009
Ups, nobody ever answered this one?|
I'm intrigued by the example, tempted to say we could simply fix the compiler.
But then I wonder: T1.NR has an implementation for foo, OK, but it could still be abstract even if it contains no abstract methods.
In Java, marking a class as abstract is more than acknowledging that it has one or more abstract methods, it could simply be a way to specify: "not intended for instantiation".
In this light the "empty" role is an relevant override (and should be marked with @Override) re-declaring the role from abstract to non-abstract.
Let's briefly try the other way around: assume that without overriding the implicit role T1.NR would be non-abstract: how would I achieve it to be abstract (to prohibit instantiation)? I would need to "override" the abstract role with an empty abstract role. This might be a contrived example but this solution certainly feels even more weird.
From this I conclude it is indeed better, to not implicitly "improve" the role from abstract to not-abstract. Even if this is likely what you want, if it ever happens that you don't want this "improvement", you'll be much bewildered by this unsolicited magic.
does this make sense?
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