Subj : Re: generic getter for more than 256 properties
To   : Brann Joly
From : Brendan Eich
Date : Tue May 11 2004 03:11 pm

Brann Joly wrote:
>>Why would you want to use tinyids at all?  Why not just map the id to
>>whatever you need, internal to your implementation, using a hashtable?
> 
> 
> but id is a 8bit value isnt it? if it is, how can I map it with more than
> 256 values?


Look closely, id is not necessarily the same as tinyid.


> if it is not, how do you set it? (JS_DefinePropertyWithTinyId takes an int8
> for this parameter, so is there another way to set it again later?)


The id passed to a JSPropertyOp (getProperty, setProperty in JSClass) 
comes from the name parameter to JS_DefineProperty, etc. (the property 
defining APIs that lack the "WithTinyId" suffix in their names).  When 
you define a normal property, there is no tinyid.  When you define a 
property with a tinyid, the tinyid, tagged as an int jsval, gets passed 
to your JSPropertyOps.


> or maybe i'm missing something, and id is not the tinyid i thought it was.
> but then how do you set this id, and how do you get the tinyid when called?


Forget tinyids, they are not in your design target area.

/be

.