v0.2.55..v0.2.56 changeset LongestTagVisitor.h

diff --git a/hoot-core/src/main/cpp/hoot/core/visitors/LongestTagVisitor.h b/hoot-core/src/main/cpp/hoot/core/visitors/LongestTagVisitor.h
index b16356d..626e6d9 100644
--- a/hoot-core/src/main/cpp/hoot/core/visitors/LongestTagVisitor.h
+++ b/hoot-core/src/main/cpp/hoot/core/visitors/LongestTagVisitor.h
@@ -40,7 +40,8 @@ public:
 
   static std::string className() { return "hoot::LongestTagVisitor"; }
 
-  LongestTagVisitor() : _longestTag() {}
+  LongestTagVisitor() : _longestTag(0) { }
+  virtual ~LongestTagVisitor() = default;
 
   double getStat() const { return _longestTag; }