Thank you Nicolas. I'm trying to approach implementation
of INSTANCEOF support, so I have a few more questions
(mixed with quoted mail)
On Sat, Feb 04, 2006 at 11:59:16AM +0100, Nicolas Cannasse wrote:
> First in AS2 you can only implements interfaces (like Java). Interfaces
> are generated as empty classes :
>
> interface MyInterface {
> function foo() : Void;
> }
>
> is then equivalent to :
>
> MyInterface = function() {
> }
>
> The opcode [Implements] takes a list of interfaces and an AS2 "class"
> (which is just an AS1 function) and adds theses interfaces to the list
> of implemented classes. This list is not accessible from code
> afterwards, but it's used by [InstanceOf] to check the heritance pattern.
>
> Push [MyInterface]
> Push [1]; // number of interfaces on the stack
> Push [MyClass]
> Implements
Should there be a getVariable after the first and last push ?
I mean, will the stack contain strings or actual functions
references ?
> As for [Extends], in AS1 you would write the following when inheriting :
>
> MyClass.prototype.__proto__ = SuperClass.prototype;
> MyClass.prototype.__constructor__ = SuperClass;
Should this make (MyClass instanceOf SuperClass) evaluate to true ?
> While AS2 generates the following bytecode :
>
> Push [SuperClass]
> Push [MyClass]
> Extends
Same question as above. Differences in player versions are good to know
(to take the compatibility issue into account).
> Which does all the prototype chaining for you.
>
> Theses two opcodes are available starting from Player 6r89, so there is
> nothing new in terms of virtual machine in players 7 and 8.
--strk;
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