AW: userdata as table-key

["Michaela Kyavar" <michaela.kyavar@...>]

Hi Ashwin!  Thankyou for the answer.

No, I changed the variables somewhat (shortened) for the purposes of this
email.

Are you saying that the getn should not work, but indexing with the userdata
should?

M


-----Ursprüngliche Nachricht-----
Von: lua-bounces@bazar2.conectiva.com.br
[mailto:lua-bounces@bazar2.conectiva.com.br]Im Auftrag von Ashwin
Hirschi
Gesendet: Sonntag, 25. April 2004 20:24
An: Lua list
Betreff: Re: userdata as table-key



> Can you use userdata as a table key?

Yes.

> I need to associate a key (into a graphical wxLua control) with data. The
key is returned as userdata.
> So I would like to say something like
>
> 	CtrlTable[newId] = {icnt, jcnt, kcnt}
[snip<]
>
> When I do this, and then say
>         print(string.format("Size of CtrlTable = %d",
> table.getn(gCtrlTable )))
>
> The result is 0.

Well, getn() is useful if you use the table as an array, that is: store
values under the numeric keys 1, 2, 3, etc.. Since you're using the table
with non-numeric keys getn() returns 0.

> Nor can I index the table using the newId key.  Where has
> the data gone?

In the example you give the table has a different name [i.e. one with a 'g'
prepended]. Could this be the cause?

Ashwin.
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