| checks whether a key is member of the blackboard.
bb_contains_key(+Board, ?Key)
Blackboards are collections of (Key,Value) tuples.
bb_contains_key/2 allows to retrieve the Key part
of the blackboard.
If Key is not a free variable then bb_contains_key/2 succeeds if the blackboard Board contains the key Key.
If Key is a free variable then by backtracking bb_contains_key/2
lists all keys which are elements of the blackboard Board.
Arguments
Board blackboard
Key ground term
Examples
Assume there exists a blackboard 'blackboard' with elements (100, abc), (101, element101), (102, abc).
| bb_contains_key(blackboard, 100).
| Succeeds.
| | bb_contains_key(blackboard, X).
| Succeeds three times with substitution
X <- 100
X <- 101
X <- 102
|
Standard
This predicate is not part of the ISO-Prolog Standard.
See also
bb_clear/1,
bb_clear_2/2,
bb_create/1,
bb_contains/2,
bb_contains_key/2,
bb_get/3,
bb_get_4/4,
bb_put/3,
bb_put_4/4,
bb_remove/2.
bb_keys/2.
bb_elements/2.
|
