public override bool HeuristicApplies(TekBoard board, TekField field)
{
HeuristicAction action = HeuristicAction.haNone;
HeuristicAction found = HeuristicAction.haNone;
HeuristicValues.Clear(); // clear any values already set
foreach (int value in new List <int>(field.PossibleValues)) // can't use the list directly in foreach
{
switch (action = TryValue(board, field, value))
{
case HeuristicAction.haSetValue:
HeuristicValues.Clear();
AddValue(value);
found = action;
break;
case HeuristicAction.haExcludeValue:
AddValue(value);
found = action;
break;
}
if (action == HeuristicAction.haSetValue) // solution found, so we can stop
{
break;
}
// if you haven't found a solution, it doesnt hurt to continue maybe you can find a solution
// or maybe you can add a second value to exclude
}
if (found == HeuristicAction.haSetValue || found == HeuristicAction.haExcludeValue)
{
SetHeuristicAction(found);
AddHeuristicField(field);
AddAffectedField(field);
}
return(AffectedFields.Count > 0);
}
