static guint rsvp_hash ( gconstpointer k ) {
 const struct rsvp_request_key * key = ( const struct rsvp_request_key * ) k ;
 return key -> conversation ;
 }
static guint rsvp_hash ( gconstpointer k ) {
 const struct rsvp_request_key * key = ( const struct rsvp_request_key * ) k ;
 return key -> conversation ;
 }