* - Synchronization activities may possibly be connected to no action.
*/
class XBT_PUBLIC Activity {
+#ifndef DOXYGEN
friend Comm;
friend XBT_PUBLIC void intrusive_ptr_release(Comm * c);
friend XBT_PUBLIC void intrusive_ptr_add_ref(Comm * c);
friend Io;
friend XBT_PUBLIC void intrusive_ptr_release(Io* i);
friend XBT_PUBLIC void intrusive_ptr_add_ref(Io* i);
+#endif
protected:
Activity() = default;