Class InnerObject

test/cpp/wrappedobjectfactory.cpp:15–62

// ref: https://nodejs.org/api/addons.html#addons_factory_of_wrapped_objects

class InnerObject : public ObjectWrap {
 public:
  static NAN_MODULE_INIT(Init) {
    v8::Local<v8::FunctionTemplate> tpl = Nan::New<v8::FunctionTemplate>(New);
    tpl->InstanceTemplate()->SetInternalFieldCount(1);

    SetPrototypeMethod(tpl, "getValue", GetValue);

    constructor().Reset(GetFunction(tpl).ToLocalChecked());
  }

  static
  v8::Local<v8::Object> NewInstance(int argc, v8::Local<v8::Value> argv[]) {
    v8::Local<v8::Function> cons = Nan::New(constructor());
    return Nan::NewInstance(cons, argc, argv).ToLocalChecked();
  }

 private:
  explicit InnerObject(double value = 0) : value_(value) {}
  ~InnerObject() {}

  static NAN_METHOD(New) {
    if (info.IsConstructCall()) {
      double value = info[0]->IsNumber() ? To<double>(info[0]).FromJust() : 0;
      InnerObject * obj = new InnerObject(value);
      obj->Wrap(info.This());
      info.GetReturnValue().Set(info.This());
    } else {
      const int argc = 1;
      v8::Local<v8::Value> argv[argc] = {info[0]};
      v8::Local<v8::Function> cons = Nan::New(constructor());
      info.GetReturnValue().Set(
          Nan::NewInstance(cons, argc, argv).ToLocalChecked());
    }
  }

  static NAN_METHOD(GetValue) {
    InnerObject* obj = ObjectWrap::Unwrap<InnerObject>(info.Holder());
    info.GetReturnValue().Set(obj->value_);
  }

  static inline Persistent<v8::Function> & constructor() {
    static Persistent<v8::Function> my_constructor;
    return my_constructor;
  }

  double value_;
};

class MyObject : public ObjectWrap {
 public: