CommImplPtr find_matching_comm(CommImpl::Type type, int (*match_fun)(void*, void*, CommImpl*), void* this_user_data,
const CommImplPtr& my_synchro, bool done, bool remove_matching);
CommImplPtr find_matching_comm(CommImpl::Type type, int (*match_fun)(void*, void*, CommImpl*), void* this_user_data,
const CommImplPtr& my_synchro, bool done, bool remove_matching);