Subj : Re: overriding JS_EnumerateStub
To   : Edward Chan
From : Brendan Eich
Date : Thu Aug 11 2005 12:05 am

Edward Chan wrote:
> I was wondering if someone can point me to some sample code, or explain to 
> me how to override the default JS_EnumerateStub.  I basically want to add or 
> remove a property from an object's property spec at runtime.  For example,
> 
> I've defined my object and called JS_InitClass with some array of 
> JSPropertySpec's.  But when someone does a for-in loop on the obj, I there 
> are some props I may not want to make enumerable based on the state of the 
> obj.  Should I be doing this by overriding the JS_EnumerateStub?


No, not if the only properties are those you predefine on the class 
prototype by passing non-null |ps| to JS_InitClass.

Since you *do* predefine proto-properties, why not give them the right 
attributes up front?  Or are you saying that JSPROP_ENUMERATE needs to 
be cleared and set at run-time depending on the object's state?  If so, 
look into doing that on only those properties being mutated in so odd a 
fashion, via JS_GetPropertyAttributes and JS_SetPropertyAttributes.

/be

.