v0.2.55..v0.2.56 changeset AddBboxVisitor.h

diff --git a/hoot-core/src/main/cpp/hoot/core/visitors/AddBboxVisitor.h b/hoot-core/src/main/cpp/hoot/core/visitors/AddBboxVisitor.h
index c64a507..e433fc0 100644
--- a/hoot-core/src/main/cpp/hoot/core/visitors/AddBboxVisitor.h
+++ b/hoot-core/src/main/cpp/hoot/core/visitors/AddBboxVisitor.h
@@ -38,7 +38,8 @@ public:
 
   static std::string className() { return "hoot::AddBboxVisitor"; }
 
-  AddBboxVisitor();
+  AddBboxVisitor() = default;
+  virtual ~AddBboxVisitor() = default;
 
   virtual void visit(const std::shared_ptr<Element>& e) override;