- /**
- * Magic for this stack
- */
- const STACK_MAGIC = 'STACKv0.1';
-
- /**
- * Name of array index for gap position
- */
- const ARRAY_INDEX_GAP_POSITION = 'gap';
-
- /**
- * Name of array index for hash
- */
- const ARRAY_INDEX_HASH = 'hash';
-
- /**
- * Name of array index for length of raw data
- */
- const ARRAY_INDEX_DATA_LENGTH = 'length';
-
- /**
- * An instance of an Indexable class
- */
- private $indexInstance = NULL;
-