+ friend XBT_PUBLIC(void) intrusive_ptr_release(Comm * c);
+ friend XBT_PUBLIC(void) intrusive_ptr_add_ref(Comm * c);
+ friend Exec;
+ friend XBT_PUBLIC(void) intrusive_ptr_release(Exec * e);
+ friend XBT_PUBLIC(void) intrusive_ptr_add_ref(Exec * e);