Subj : spidermonkey api
To   : netscape.public.mozilla.jseng
From : Jens Thiele
Date : Thu Nov 04 2004 04:26 pm

I am currently mapping c++ class-based inheritance to prototype based
inheritance.

In JavaScript:

function Base() {
};
Base.prototype.baseMethod = ...

function Sub() {
//  Base.call(this);
};

Sub.prototype.__proto__   = Base.prototype;
Sub.prototype.specialized = ...

see also:
http://egachine.berlios.de/inheritance/

now in my native code for the c++ example i use the following _HACK_ to
be able to create a constructor with a different name for the same
internal [[class]]:


JSBool BaseWrapper_init(JSContext *cx, JSObject *global)
{
  if (!(BaseWrapper_proto
	= JS_InitClass(cx, global, NULL, &BaseWrapper_class,
		       BaseWrapper_cons, 0, NULL,
		       BaseWrapper_methods, NULL, NULL)))
    return JS_FALSE;
  return JS_TRUE;
}

JSBool
SubWrapper_init(JSContext *cx, JSObject *global)
{
  JSObject* subproto;
  // HACK
  const char *tmp=BaseWrapper_class.name;
  BaseWrapper_class.name="Sub";
  subproto=JS_InitClass(cx,global,
	  BaseWrapper_proto, &BaseWrapper_class,
	  SubWrapper_cons, 0,
	  NULL, SubWrapper_methods,
	  NULL, NULL);
  BaseWrapper_class.name=tmp;
  if (!subproto) return JS_FALSE;
  return JS_TRUE;
}

to remove this hack i would have to nearly duplicate JS_InitClass
and it seems i would have to use non-public api functions
am i missing something?

.