for(simgrid::surf::ActionList::iterator it(action_list->begin()), itNext = it, itend(action_list->end()) ;
it != itend ; it=itNext) {
++itNext;
for(simgrid::surf::ActionList::iterator it(action_list->begin()), itNext = it, itend(action_list->end()) ;
it != itend ; it=itNext) {
++itNext;