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?
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