public StandardHeuristic(IReadOnlyBoxPuzzle puzzle, PossibleValues possibleValues,
IMissingRowValuesTracker rowRule, IMissingColumnValuesTracker columnRule, IMissingBoxValuesTracker boxRule)
{
_rowHeuristic = new UniqueInRowHeuristic(puzzle, possibleValues, rowRule);
_columnHeuristic = new UniqueInColumnHeuristic(puzzle, possibleValues, columnRule);
_boxHeuristic = new UniqueInBoxHeuristic(puzzle, possibleValues, boxRule);
_numHeuristicsRan = new Stack <int>(puzzle.NumEmptySquares);
}
/// <summary>
/// Creates a standard heuristic that combines the <see cref="UniqueInRowHeuristic"/>,
/// <see cref="UniqueInColumnHeuristic"/>, and <see cref="UniqueInBoxHeuristic"/>.
/// </summary>
/// <param name="rowValuesTracker">
/// Something that tracks the possible values for each row.
/// </param>
/// <param name="columnValuesTracker">
/// Something that tracks the possible values for each column.
/// </param>
/// <param name="boxValuesTracker">
/// Something that tracks the possible values for each box.
/// </param>
public StandardHeuristic(
IMissingRowValuesTracker rowValuesTracker,
IMissingColumnValuesTracker columnValuesTracker,
IMissingBoxValuesTracker boxValuesTracker)
{
_rowHeuristic = new UniqueInRowHeuristic(rowValuesTracker);
_columnHeuristic = new UniqueInColumnHeuristic(columnValuesTracker);
_boxHeuristic = new UniqueInBoxHeuristic(boxValuesTracker);
_numHeuristicsRan = new Stack <int>();
}
private UniqueInRowHeuristic(
UniqueInRowHeuristic existing,
IReadOnlyPuzzle puzzle,
PossibleValues possibleValues,
IMissingRowValuesTracker rule)
{
_puzzle = puzzle;
_possibleValues = possibleValues;
_rowTracker = rule;
_possiblesToCheckInRow = (BitVector[])existing._possiblesToCheckInRow.Clone();
_previousPossiblesStack = new Stack <IReadOnlyDictionary <Coordinate, BitVector> >(
existing._previousPossiblesStack);
}
private UniqueInRowHeuristic(
UniqueInRowHeuristic existing,
IReadOnlyPuzzleWithMutablePossibleValues?puzzle,
IMissingRowValuesTracker tracker)
{
_rowTracker = tracker;
_puzzle = puzzle;
if (existing._helper is not null &&
puzzle is not null)
{
_helper = existing._helper.CopyWithNewReference(puzzle);
}
}
private StandardHeuristic(
StandardHeuristic existing,
IReadOnlyPuzzleWithMutablePossibleValues?puzzle,
ReadOnlySpan <IRule> rules)
{
_rowHeuristic = (UniqueInRowHeuristic)existing._rowHeuristic.CopyWithNewReferences(
puzzle, rules);
_columnHeuristic = (UniqueInColumnHeuristic)existing._columnHeuristic
.CopyWithNewReferences(puzzle, rules);
_boxHeuristic = (UniqueInBoxHeuristic)existing._boxHeuristic.CopyWithNewReferences(
puzzle, rules);
_numHeuristicsRan = new Stack <int>(existing._numHeuristicsRan);
}
private StandardHeuristic(
StandardHeuristic existing,
IReadOnlyPuzzle puzzle,
PossibleValues possibleValues,
IReadOnlyList <ISudokuRule> rules)
{
_rowHeuristic = (UniqueInRowHeuristic)existing._rowHeuristic.CopyWithNewReferences(
puzzle, possibleValues, rules);
_columnHeuristic = (UniqueInColumnHeuristic)existing._columnHeuristic
.CopyWithNewReferences(puzzle, possibleValues, rules);
_boxHeuristic = (UniqueInBoxHeuristic)existing._boxHeuristic.CopyWithNewReferences(
puzzle, possibleValues, rules);
_numHeuristicsRan = new Stack <int>(existing._numHeuristicsRan);
}