[gambit-list] table-update! primitive
Lassi Kortela
lassi at lassi.io
Sat Oct 26 05:51:56 EDT 2019
> Can we add a table-update! primitive?
> Updates are currently slow because they need two lookups in the hash table,
> one to find the current value (if any) and one to set it.
> The canonical signature is (table-update! table key update default), where
> update is applied to the current value, using default if the value is unset.
+1
Existing versions of an update procedure:
;; R6RS
(hashtable-update! table key update default)
;; SRFI 69
(hash-table-update! table key update [thunk])
(hash-table-update!/default table key update default)
;; SRFI 125
(hash-table-update! table key update [failure [success]])
(hash-table-update!/default table key update default)
More information about the Gambit-list
mailing list