Module org.maxicp

Package org.maxicp.cp.engine.constraints

Class AtLeastNValueFWC

java.lang.Object

org.maxicp.cp.engine.core.AbstractCPConstraint

org.maxicp.cp.engine.constraints.AtLeastNValueFWC

All Implemented Interfaces:

CPConstraint, ConcreteConstraint<ConcreteCPModel>

Direct Known Subclasses:

AllDifferentFWC

public class AtLeastNValueFWC
extends AbstractCPConstraint

Forward Checking filtering for the AtLeastNValue constraint.

Enforces that the number of distinct values taken by the variables in x is at least nValue: |{x[i] | 0 <= i < x.length}| >= nValue.

Constructor Summary

Constructors

Constructor	Description
AtLeastNValueFWC(CPIntVar[] x, CPIntVar nValue)	The number of values that are used in the array x is at least nValue: #{x[i] | i in 0..x.length-1} >= nValue.

Method Summary

Modifier and Type	Method	Description
void	post()	Initializes the constraint when it is posted to the solver.
void	propagate()	Propagates the constraint.

Methods inherited from class org.maxicp.cp.engine.core.AbstractCPConstraint

getSolver, isActive, isScheduled, priority, registerDelta, setActive, setScheduled, updateDeltas

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

AtLeastNValueFWC

public AtLeastNValueFWC(CPIntVar[] x,
 CPIntVar nValue)

The number of values that are used in the array x is at least nValue: #{x[i] | i in 0..x.length-1} >= nValue.

Parameters:

x - array of variables

nValue - the number of values that are used in the array x is at least nValue

Method Details

post

public void post()

Description copied from interface: CPConstraint

Initializes the constraint when it is posted to the solver.

Specified by:

post in interface CPConstraint

Overrides:

post in class AbstractCPConstraint

propagate

public void propagate()

Description copied from interface: CPConstraint

Propagates the constraint.

Specified by:

propagate in interface CPConstraint

Overrides:

propagate in class AbstractCPConstraint