Subj : distinguishing between constructor/function call
To   : netscape.public.mozilla.jseng
From : Jason
Date : Wed Feb 09 2005 08:08 am

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...

.