This problem has a technical name, I can never remember if this is co-
or contra-variance. There's no pretty solution in a strongly-typed
language (as you surely know from writing Java).
I think your best bet is to declare a textsprite slot and use that to
access the textsprite interface when needed (that way you only have
one cast to make -- at construct time).
On 2008-01-07, at 18:41 EST, Henry Minsky wrote:
In LzView, the "sprite" instance var is pointing to an instance of
LzSprite, whereas in LzText, it expects to talk to
an instance of LzTextSprite (which is a subclass of LzSprite).
LzText calls a number of LzTextSprite methods, such as in it's
construct method:
this.sprite.__initTextProperties(args);
So in as3, you're not allowed to override a superclass's instance var
with a var of the same name but a different type.
This is a particular issue because I am not declaring LzSprite
dynamic, I want it to be a sealed class
in order to get the performance benefits.
So how should this be handled?
Should I cast it before each call, or declare another var with type
LzTextSprite and point the sprite var at it?
--
Henry Minsky
Software Architect
[EMAIL PROTECTED]
