Reimplement getClassName method in Dynamic and DynamicHrp2.

include/sot-dynamic/dynamic-hrp2.h

@@ -65,6 +65,10 @@ class SOTDYNAMICHRP2_EXPORT DynamicHrp2
 {
 
  public:
+  virtual const std::string& getClassName () const
+  {
+    return CLASS_NAME;
+  }
   static const std::string CLASS_NAME;
 
  public: /* --- CONSTRUCTION --- */

include/sot-dynamic/dynamic.h

@@ -93,6 +93,10 @@ class SOTDYNAMIC_EXPORT Dynamic
   friend class sot::command::InitializeRobot;
 
  public:
+  virtual const std::string& getClassName () const
+  {
+    return CLASS_NAME;
+  }
   static const std::string CLASS_NAME;
 
  protected: