+ static void (*copy_data_callback_)(CommImpl*, void*, size_t);
+
+ double rate_ = 0.0;
+ double size_ = 0.0;
+ bool detached_ = false; /* If detached or not */
+ bool copied_ = false; /* whether the data were already copied */
+ MailboxImpl* mbox_ = nullptr; /* Rendez-vous where the comm is queued */
+ s4u::Host* from_ = nullptr; /* Pre-determined only for direct host-to-host communications */
+ s4u::Host* to_ = nullptr; /* Otherwise, computed at start() time from the actors */