On Nov 30, 2008, at 11:55 AM, Thomas Tempelmann wrote:
On 30.11.2008 17:46 Uhr, "Michael Diehr" <md03@xochi.com> wrote:
* a way for a subclass (including window classes) to shadow a
superclass property with a method or computed property, and then
access that property:
We had a discussion on this just recently in the forum:
http://forums.realsoftware.com/viewtopic.php?f=1&t=25181
I see two possible solutions:
1. Enhance the compiler to make computed properties virtual so that
they can
be overridden just like "normal" class methods.
2. Turn all computed properties in the framework into methods
(functions) so
that they can be overridden without a need for a changed compiler.
I like the second way better because it would be cleaner - we've
learned
that properties are not overridable, and solution 1 would mess with
that.
Also, solution 2 would make sure that ALL accessible "properties" in
the
framework classes would be implemented as virtual methods, so that
even
properties that are now _real_ properties, would become overridable by
subclasses, which wouldn't be the case with solution 1.
I don't see why this would be a good idea. Currently, one can add get/
set method pairs to an interface. This provides one with a way to add
things with the property look-and-feel to an interface. Computed
properties provide a way to add more or less the same thing to a
class, and prevent them from being overridden. Also, when writing
this feature request, don't forget to take return-type covariance into
account.
Charles Yeomans
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