- size_=0; /* size */
- rank_to_index_map_=nullptr; /* rank_to_index_map_ */
- refcount_=1; /* refcount_: start > 0 so that this group never gets freed */
+ size_ = 0; /* size */
+ rank_to_index_map_ = nullptr; /* rank_to_index_map_ */
+ refcount_ = 1; /* refcount_: start > 0 so that this group never gets freed */