*
* This class is the ancestor of every activities that an actor can undertake, that is, of the actions that do take time in the simulated world.
*/
-XBT_PUBLIC_CLASS Activity {
+class XBT_PUBLIC Activity {
friend Comm;
friend XBT_PUBLIC void intrusive_ptr_release(Comm * c);
friend XBT_PUBLIC void intrusive_ptr_add_ref(Comm * c);