accesors to internal typename from derived class

src/OpenMesh/Core/Utils/Property.hh

@@ -99,8 +99,10 @@ public:
 public:
 
   /// Default constructor
-  explicit PropertyT(const std::string& _name = "<unknown>")
+  explicit PropertyT(
-  : BaseProperty(_name)
+            const std::string& _name = "<unknown>",
+            const std::string& _internal_type_name = "<unknown>")
+  : BaseProperty(_name, _internal_type_name)
   {}
 
   /// Copy constructor