| Is there handle up-casting in meta-domain? [message #1629] |
Wed, 11 March 2009 20:10  |
Eclipse User |
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Champs,
In the meta-domain, is there a notion of up-casting an object handle to its inherited interface?
For example, when creating a MessageQ instance, it requires an ISync.Handle. I have the following target code which up-casts the SyncSemThread handle.
/* create a synchronizer for the message queue */
obj->sync = SyncSemThread_create(NULL, eb);
/* create the message queue for inbound messages */
MessageQ_Params_init(&mqParams);
mqParams.synchronizer = SyncSemThread_Handle_upCast(obj->sync);
obj->msgQ = MessageQ_create(name, &mqParams, eb);
I'm wondering what the equivalent meta code would look like. Here is what I currently have (without any up-cast).
/* create a synchronizer for the message queue */
obj.sync = SyncSemThread.create();
/* create the message queue for inbound messages */
var MessageQParams = new MessageQ.Params();
MessageQParams.synchronizer = obj.sync;
obj.msgQ = MessageQ.create(name, MessageQParams);
Is this meta code correct, or do I need to do something else?
Thanks
~ Ramsey
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| Re: Is there handle up-casting in meta-domain? [message #1851 is a reply to message #1629] |
Mon, 16 March 2009 11:41  |
| Eclipse User |
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Ramsey Harris wrote:
> Champs,
>
> In the meta-domain, is there a notion of up-casting an object handle to
> its inherited interface?
Yes. See http://rtsc.eclipse.org/docs-tip/XDCscript_-_Typed-Object.%2 4orig
>
> For example, when creating a MessageQ instance, it requires an
> ISync.Handle. I have the following target code which up-casts the
> SyncSemThread handle.
>
> /* create a synchronizer for the message queue */
> obj->sync = SyncSemThread_create(NULL, eb);
>
> /* create the message queue for inbound messages */
> MessageQ_Params_init(&mqParams);
> mqParams.synchronizer = SyncSemThread_Handle_upCast(obj->sync);
> obj->msgQ = MessageQ_create(name, &mqParams, eb);
>
> I'm wondering what the equivalent meta code would look like. Here is
> what I currently have (without any up-cast).
>
> /* create a synchronizer for the message queue */
> obj.sync = SyncSemThread.create();
>
> /* create the message queue for inbound messages */
> var MessageQParams = new MessageQ.Params();
> MessageQParams.synchronizer = obj.sync;
> obj.msgQ = MessageQ.create(name, MessageQParams);
>
> Is this meta code correct, or do I need to do something else?
If you don't get a type error when the code runs, it is correct (from an
up-cast point of view). If you get a type error you can cast typed objects.
For example, in the ti.targets package we cast xdc.bld.ITarget modules
to ti.target.ITarget modules as follows:
/* check type before casting, to avoid cast error */
if (mod instanceof this.ITarget.Module) {
/* cast so we can access extened methods */
var targ = this.ITarget.Module(mod);
:
}
>
> Thanks
> ~ Ramsey
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