[Laszlo-dev] For Review: Change 20081021-dda-p Summary: Add return type declarations to SWF9

[Donald Anderson]

On Oct 21, 2008, at 2:33 PM, P T Withington wrote:

> On 2008-10-21, at 13:57EDT, Donald Anderson wrote:
>
>>
>> On Oct 21, 2008, at 1:01 PM, P T Withington wrote:
>>
>>> Great stuff!
>>>
>>> Comments:
>>>
>>> 1) Our idiom for undefined is `void 0`, because of (http://tinyurl.com/2z3q2o 
>>> ),
>>
>> On an existing line with 'return void(0);'  , I got a flex error  
>> about mismatching type.
>
> There are surely plenty of places in our code where we use the idiom  
> `void 0` to mean undefined, so the problem must lie elsewhere.   
> `undefined` may be undefined in as3, but it is not in js1, so we  
> can't rely on that.
>
> `void` is a unary prefix operator that is defined to evaluate its  
> operand and return the undefined value.  If Flex is whining about  
> that, I'd say that's a Flex bug.
>
> The parens are not necessary because `void` is an operator not a  
> function and 0 and (0) are equivalent expressions.  I used 0 as the  
> expression as a nano-optimization (from knowing the byte-codes that  
> get generated).
>

FWIW, here's the error I get if I leave return void(0) in this function:

[/tmp/lzswf9/lzgen49569/LzReplicationManager.as: 344] data/ 
LzReplicationManager.lzs: 485: Error: Implicit coercion of a value of  
type void to an unrelated type LzReplicationManager.


--

Don Anderson
Java/C/C++, Berkeley DB, systems consultant

voice: 617-547-7881
email: dda at ddanderson.com
www: http://www.ddanderson.com



-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.openlaszlo.org/pipermail/laszlo-dev/attachments/20081021/ca6474b3/attachment-0001.html