JavaScript inheritance from C++ class

[Adrian Vega]

Hello,

Im trying to make an extended Point class that inherits from our C++ Point class, something like this on C++ side:

	GFX.class_<Point>("Point")
		.constructor<double, double>()
		.fun<&Point::x>("x")
		.fun<&Point::y>("y");

And this on JS side:

function Point() { this.initialize.apply(this, arguments); }\
Point.prototype = Object.create(GFX.Point.prototype);
Point.prototype.constructor = Point;
Point.prototype.initialize = function(x, y) { GFX.Point.call(this, x, y); };
Point.emptyPoint = new Point(0, 0);

This seems to flop due to "JS_CFUNC_constructor" been used instead of "JS_CFUNC_constructor_or_func" so it raises a constructor called without "new" issue. If I edit the wrap method and place JS_CFUNC_constructor_or_func that issue is gone and a this

proto = detail::GetPropertyPrototype(ctx, this_value);

Casts a trying to access undefined property issue. If I modify the previous code into

JSValue proto ;
if (JS_IsUndefined(this_value))
{
    proto = JS_GetClassProto(ctx, js_traits<std::shared_ptr<T>>::QJSClassId);
} else
    proto = detail::GetPropertyPrototype(ctx, this_value);

It works and

console.log(Point.emptyPoint instanceof GFX.Point)
console.log(Point.emptyPoint instanceof Point)

Both return TRUE, but when I do
console.log(Point.emptyPoint.x)

I get TypeError: Expected type struct Point, got object with classid 1, Im unsure what to edit at this point to support what we need, any help would be very appreciated.

[Sam]

have you tried using ES6 for class inheritance? it works for me this way

eg:

class Point extends GFX.Point {
  constructor(x, y) {
    super(x, y);
  }

  ...
}