Method count

3rdparty/libprocess/src/event_queue.hpp:161–171

  template <typename T>
  size_t count()
  {
    synchronized (mutex) {
      return std::count_if(
          events.begin(),
          events.end(),
          [](const Event* event) {
            return event->is<T>();
          });
    }
  }

  operator JSON::Array()
  {