How are "out parameters" represented for Seed JavaScript GObject bindings?

Question

I've just started using Seed for development. One thing that Seed's web page mentions is that it "Maps C-isms (say, out arguments, or enums) to things that make sense in JavaScript." Unfortunately, I can't find any documentation or examples for how out arguments should work. So, for example, the following call in Seed:

window.get_size()

Will return the error "GInvokeError Too few "out" arguments (handling out)"

In C, the call would be expressed by passing in two out arguments:

gtk_window_get_size(GTK_WINDOW(widget), &width, &height);

I've tried various permutations on the JavaScript call without success. I've also looked at the documentation and sample code, but haven't found anything. Short of looking at the code, I think I'm running out of options.

I'd appreciate any insight anyone can offer into this.

Answer 1

var o1 = {};
var o2 = {};
window.get_size(o1, o2);

var width = o1.value;
var height = o2.value;

There's an example in http://git.gnome.org/browse/seed/tree/tests/javascript/out-test.js (when lacking documentation it's sometimes useful to look at the tests.)