namespace PathFinding
{
  public enum HaltCondition
  {
    /// <summary>
    /// Do not stop until you reach the collection boundary.
    /// </summary>
    None,
    /// <summary>
    /// Halt after encountering a non-null element.
    /// </summary>
    AfterCollide
  }
}
public enum Distance
{
  OneStep,
  MultiStep
}