Subj : Re: distinguishing between constructor/function call
To   : netscape.public.mozilla.jseng
From : Ludovic Delabre
Date : Wed Feb 09 2005 06:02 pm

Hi!
For distinguish between construction and function call use 
JS_IsConstructing(cx)...

But I don't know exactly what (I'm supposed) to do in case of function 
call...

Ludovic.

Lot's of info there

Jason wrote:
> If I create a new object class Thingamajig using JS_InitClass,
> how can I distinguish between these syntaxes:
> (1) a = new Thingamajig()
> (2) b = Thingamajig()
> and what's the recommended action in general for (2)? My thought is to
> return null (safe) or make (2) behave like (1) by calling
> JS_NewObject(). Right now my object's constructor causes a crash in
> syntax (2) when it tries to call JS_SetPrivate().
> 
> I looked at jsdate.c which does this in the Date constructor:
>     /* Date called as function */
>     if (!(cx->fp->flags & JSFRAME_CONSTRUCTING)) {
> 
> but that's not a JSAPI call...
>

.