Well, if you're creating a new FunctionTemplate, then of course your
existing "car" object isn't an instance of that new class ;-)
Value::InstanceOf is the C++ equivalent of JavaScript "instanceof":
Local<Value> object = Local<Value>::Cast(FindObject("car")); // Assuming
"car" is, indeed, a Value. Check first if needed.
Local<Object> car_class = FindObject("Car");
object->InstanceOf(context, car_class); // Should return Just(true).
Throws if car_class is not a function.
On Wed, Jun 20, 2018 at 11:00 PM Gonzalo Diethelm <
gonzalo.dieth...@gmail.com> wrote:
> I run the following JS code in the Chrome console:
>
> // Version 67.0.3396.87 (Official Build) (64-bit)
>
> function Car(make) { this.make = make }
> var car = new Car('Ferrari')
> car instanceof Car // returns true
>
> Now, on my C++ code I get ahold of car (by looking "car" up in the global
> context), and want to run the equivalent instanceof code, given only the
> class name "Car" as a string. Notice that I do not have a C++ class /
> function backing up Car.
>
> Just to make it clear, compiling and running "car instanceof Car" as JS
> code in my C++ code, works totally fine.
>
> I naively tried to do something like this, which didn't work:
>
> Local<Object> object = FindObject("car"); // this works
> Local<FunctionTemplate> ft = FunctionTemplate::New(isolate);
> Local<String> name = String::NewFromUtf8(
> isolate, "Car", NewStringType::kNormal).ToLocalChecked();
> ft->SetClassName(name);
> if (ft->HasInstance(object)) {
> // this never happens
> }
>
> How can I do this, without manually compiling / running JS code?
>
> Thanks!
>
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