Delete broken Property assignment operator.

src/OpenVolumeMesh/Core/BaseProperty.cc

@@ -46,10 +46,4 @@
 
 namespace OpenVolumeMesh {
 
-BaseProperty& BaseProperty::operator=(const BaseProperty& _cpy) {
-    resMan_ = _cpy.resMan_;
-    lock_ = _cpy.lock_;
-    return *this;
-}
-
 } // Namespace OpenVolumeMesh

src/OpenVolumeMesh/Core/BaseProperty.hh

@@ -59,7 +59,7 @@ public:
 
     BaseProperty(const BaseProperty& _cpy) : resMan_(_cpy.resMan_), lock_(_cpy.lock_) {}
 
-    BaseProperty& operator=(const BaseProperty& _cpy);
+    BaseProperty& operator=(const BaseProperty& _cpy) = delete;
 
     virtual ~BaseProperty() {}