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template<typename T> Histogram<T>& histogram (std::string const& name) {
    std::lock_guard<std::mutex> guard(_lock);
    auto const it = _registry.find(name);
    if (it == _registry.end()) {
      LOG_TOPIC("32d85", ERR, Logger::STATISTICS) << "No histogram booked as " << name;
      TRI_ASSERT(false);
      throw std::exception();
    } 
    std::shared_ptr<Histogram<T>> h = nullptr;
    try {
      h = std::dynamic_pointer_cast<Histogram<T>>(*it->second);
      if (h == nullptr) {
        LOG_TOPIC("d2358", ERR, Logger::STATISTICS) << "Failed to retrieve histogram " << name;
      }
    } catch (std::exception const& e) {
      LOG_TOPIC("32d75", ERR, Logger::STATISTICS)
        << "Failed to retrieve histogram " << name << ": " << e.what();
    }
    if (h == nullptr) {
      TRI_ASSERT(false);
    }

    return *h;
  };