v0.2.55..v0.2.56 changeset MedianNodeVisitor.h

diff --git a/hoot-core/src/main/cpp/hoot/core/visitors/MedianNodeVisitor.h b/hoot-core/src/main/cpp/hoot/core/visitors/MedianNodeVisitor.h
index 2eb273c..11653da 100644
--- a/hoot-core/src/main/cpp/hoot/core/visitors/MedianNodeVisitor.h
+++ b/hoot-core/src/main/cpp/hoot/core/visitors/MedianNodeVisitor.h
@@ -44,7 +44,8 @@ public:
 
   static std::string className() { return "hoot::MedianNodeVisitor"; }
 
-  MedianNodeVisitor();
+  MedianNodeVisitor() = default;
+  virtual ~MedianNodeVisitor() = default;
 
   virtual void visit(const ConstElementPtr& e);