Clears a blackboard.

bb_clear(+Board, +Key)

bb_clear/2 removes all elements from the inner blackboard identified with Key, belonging to the outer blackboard Board. This predicate is equivalent to:

bb_get(Board, Key, SubBoard) -> bb_clear(SubBoard) ; true

Arguments

Board              blackboard
Key                ground term

Examples

    bb_create(SparseArray),
    bb_put(SparseArray, 7, 563, 10),
    % elements: 7 -> { 365 -> 10 }
    bb_put(SparseArray, 7, 43, 15),
    % elements: 7 -> { 365 -> 10, 43 -> 15 }
    bb_put(SparseArray, 365, 5, 20),
    % elements: 7 -> { 365 -> 10, 43 -> 15 }, 365 -> { 5 -> 20 }
    bb_clear(SparseArray, 7)
    % elements: 7 -> {} , 365 -> { 5 -> 20 }

Standard

This predicate is not part of the ISO-Prolog Standard.

See also