I don't know how nan expects bindings to work, so I can't really help you
there. Maybe somebody with more nan knowledge can chime in, or maybe
consider reaching out to the nan authors?
On Fri, Sep 2, 2016 at 5:42 AM Zach Bjornson <zbbjorn...@gmail.com> wrote:
> Hello,
>
> I'm trying to fix some code that creates a wrapped C++ object ("Canvas",
> emulating HTMLCanvasElement) with property accessors on the prototype.
> Specifically, these assertions should work to reflect browsers'
> HTMLCanvasElement API:
>
> var c = new Canvas(...);
> assert(!c.hasOwnProperty("width"));
> assert("width" in c);
> assert(HTMLCanvasElement.prototype.hasOwnProperty("width"));
>
> Currently there's an assertion failure (from nan) because the
> InternalFieldCount for the PrototypeTemplate is 0. Setting it to 1 fixes
> this problem, but without touching the rest of the code, both the
> FunctionTemplate and the PrototypeTemplate now have an InternalFieldCount
> of 1. Is that the correct situation? I can't find any examples of setting
> accessors on prototypes to work from.
>
> The class in question is this:
> https://github.com/Automattic/node-canvas/blob/master/src/Canvas.cc#L30
> (sorry it uses nan's macros and not raw v8 APIs)
> and the patch setting the PrototypeTemplate's InternalFieldCount is
> https://github.com/Automattic/node-canvas/issues/803#issuecomment-244275154
>
> Thanks,
> Zach
>
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