v0.2.55..v0.2.56 changeset BuildingMerger.h

diff --git a/hoot-core/src/main/cpp/hoot/core/conflate/polygon/BuildingMerger.h b/hoot-core/src/main/cpp/hoot/core/conflate/polygon/BuildingMerger.h
index 45c9a9e..3d3f1be 100644
--- a/hoot-core/src/main/cpp/hoot/core/conflate/polygon/BuildingMerger.h
+++ b/hoot-core/src/main/cpp/hoot/core/conflate/polygon/BuildingMerger.h
@@ -45,9 +45,8 @@ public:
 
   static std::string className() { return "hoot::BuildingMerger"; }
 
-  static int logWarnCount;
-
-  BuildingMerger();
+  BuildingMerger() = default;
+  virtual ~BuildingMerger() = default;
   /**
    * Constructed with a set of element matching pairs. The pairs are generally Unknown1 as first
    * and Unknown2 as second.
@@ -113,6 +112,8 @@ protected:
 
 private:
 
+  static int logWarnCount;
+
   friend class BuildingMergerTest;
 
   std::set<std::pair<ElementId, ElementId>> _pairs;