If the definition of abstraction is that one can't instantiate an
instance of the abstract class (I'm cribbing the definition of it here
a bit from Java/C#/etc where one can't instantiate abstract classes by
restriction in the language) then how about overriding #new on the
class side with an implementation which provides an exception from any
send to #new on that class and implement an #isAbstract that looks for
that exception?
That's of course assuming that non-instantiability is a desired
behaviour here. This could well be a bogus assumption on my part.
Cheers,
Simon
On 6 Oct 2008, at 07:18, Stéphane Ducasse wrote:
this is why there is a or in my expression and this is why I still
would like to have a way to declare a class as abstract even if it
does not have abstract methods.
stef
On Oct 5, 2008, at 11:34 PM, Alexandre Bergel wrote:
A class is said to be abstract if its not reasonable to instantiate
it. An abstract class may perfectly have no abstract method.
Cheers,
Alexandre
On 5 Oct 2008, at 11:49, Stéphane Ducasse wrote:
I would really like to have a way to specify that a class is
abstract.
For example I would like to be able to write a test as follow
self assert: (Collection allSubclasses reject: [:each
each isAbstract ]) new isEmpty
now saying that isAbstract is if a class has one method sending
subclassResponsibility is not
really good for me.
May be we could have something like
isAbstract
^ self declaredAsAbstract
or: [ (self whichSelectorsReferToSymbol:
#subclassResponsibility) isEmpty not]
Stef
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