typedef boost::intrusive_ptr<ActivityImpl> ActivityImplPtr;
XBT_PUBLIC void intrusive_ptr_add_ref(ActivityImpl* activity);
XBT_PUBLIC void intrusive_ptr_release(ActivityImpl* activity);
typedef boost::intrusive_ptr<ActivityImpl> ActivityImplPtr;
XBT_PUBLIC void intrusive_ptr_add_ref(ActivityImpl* activity);
XBT_PUBLIC void intrusive_ptr_release(ActivityImpl* activity);