# Pastebin wHbkPcH5
// A utility for weakly holding a persistent handle to a v8::Data.
template<typename T>
class WeakPersistent {
public:
  WeakPersistent() { }

  void Set(v8::Local<T> data) {
    handle_.Reset(data);
    handle_.SetWeak(this, Finalize, Nan::WeakCallbackType::kParameter);
  }

  v8::Local<v8::FunctionTemplate> Get() {
    return Nan::New<v8::FunctionTemplate>(handle_);
  }

private:
  static void Finalize(const Nan::WeakCallbackInfo<WeakPersistent<T>>& data) {
    WeakPersistent<T> *persistent = data.GetParameter();
    persistent->handle_.Reset();
    delete persistent;
  }

  Nan::Persistent<v8::FunctionTemplate> handle_;
};