message: Remove using directive
diff: @@ -108,13 +108,10 @@ public:
  Callback& resourceObserver() { return _observerCallback; }
  -private:
  - using ResourceTable = std::map<ResourceType, int>;
  -
  private:
  int _capacity = 0; /**< Maximum available capacity of the ResourcePool. */
  - ResourceTable _resourceTable;
  + std::map<ResourceType, int> _resourceTable;
  Callback _observerCallback;
  };
  