cs_random_violated(+CS, -Cstr)

CS

Constraint set

Cstr

A constraint term (output)

Description

Returns a currently violated constraint from the constraint set, i.e. all the constraints whose violation count is currently nonzero. If there are several, a random one is returned.

If the constraints were added with aliases (see :~ /2), the alias term is retrieved instead of the constraint goal.

Modes and Determinism

• cs_random_violated(+, -) is semidet

Fail Conditions

Examples

    ?- [X, Y] tent_set [3, 4], CS :~ (X $= Y), CS :~ (X $\= Y),
       cs_random_violated(CS, C).
    X = X{3 -> 0}
    Y = Y{4 -> 0}
    CS = constraint_set(TotalVio{1 -> 0}, ...)
    C = X{3 -> 0} $= Y{4 -> 0}
    There are 2 delayed goals.
    Yes (0.00s cpu)
    

See Also