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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.| document: http://www.ifcomputer.co.jp/MINERVA/Manual/Reference/Predicates/blackboard/bb_contains_key/print_de.html published 2008/11/17 update 2001/2/7 (c) 1996-2006 IF Computer Japan | ||||||||
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