On Thu, Jun 13, 2019 at 11:05 AM Darin Dimitrov
<darin.dimit...@gmail.com> wrote:
>
> I am trying to associate some custom C++ data with a Local<Function> instance.
>
> Currently I am able to achieve this only to instances created with this
> function:
>
> Local<FunctionTemplate> tmpl = FunctionTemplate::New(isolate, [](const
> FunctionCallbackInfo<Value> &info) {
> Isolate* isolate = info.GetIsolate();
> // Associate some custom C++ data with the instance created through this
> function
> info.This()->SetInternalField(0, External::New(isolate, nullptr));
> });
> tmpl->InstanceTemplate()->SetInternalFieldCount(1);
> Local<Function> func = tmpl->GetFunction(context).ToLocalChecked();
>
> Local<Object> instance = func->NewInstance(context).ToLocalChecked();
> // Getting back the C++ data associated with the instance
> Local<External> extData = instance->GetInternalField(0).As<External>();
>
> What I would like to achieve is to associate the function instance with
> custom data:
>
> func->SetInternalField(0, External::New(isolate, nullptr));
>
> But unfortunately this throws an "Internal field out of bounds error".
>
> Is it possible to achieve this?
Yes, you can. Put the External on the Function with
Function::SetPrivate(). You can then retrieve it again with
Function::GetPrivate(). Create the Private key with Private::ForApi().
GetPrivate() and SetPrivate() are inherited from Object so it works
for Objects, Arrays, Maps and Sets as well.
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