diff options
Diffstat (limited to 'absl/container/internal/raw_hash_set.h')
| -rw-r--r-- | absl/container/internal/raw_hash_set.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/absl/container/internal/raw_hash_set.h b/absl/container/internal/raw_hash_set.h index 212052ea..5c5db12e 100644 --- a/absl/container/internal/raw_hash_set.h +++ b/absl/container/internal/raw_hash_set.h @@ -87,6 +87,17 @@ // // This probing function guarantees that after N probes, all the groups of the // table will be probed exactly once. +// +// The control state and slot array are stored contiguously in a shared heap +// allocation. The layout of this allocation is: `capacity()` control bytes, +// one sentinel control byte, `Group::kWidth - 1` cloned control bytes, +// <possible padding>, `capacity()` slots. The sentinel control byte is used in +// iteration so we know when we reach the end of the table. The cloned control +// bytes at the end of the table are cloned from the beginning of the table so +// groups that begin near the end of the table can see a full group. In cases in +// which there are more than `capacity()` cloned control bytes, the extra bytes +// are `kEmpty`, and these ensure that we always see at least one empty slot and +// can stop an unsuccessful search. #ifndef ABSL_CONTAINER_INTERNAL_RAW_HASH_SET_H_ #define ABSL_CONTAINER_INTERNAL_RAW_HASH_SET_H_ |