protected bool Step(HopOptions hopOptions, Func <Hop, bool> callback)
{
while (hopOptions.OptionAvailable)
{
Hop hop = hopOptions.CurrrentHop;
UndoStack.Push(hop);
if (callback(hop))
{
return(false);
}
List <Hop> allowedHops = board.GetAllowedHops();
bool cont = Step(new HopOptions(allowedHops), callback);
if (!cont)
{
return(false);
}
UndoStack.Pop();
board.UndoHopPeg(hop);
hopOptions.NextOptionIndex();
}
return(true);
}
public override bool Step()
{
++Iterations;
bool next = true;
List <Hop> allowedHops = board.GetAllowedHops();
if (allowedHops.Count == 0)
{
// No solution. Unwind.
next = Unwind();
}
else
{
HopOptions hopOptions = new HopOptions(allowedHops);
HopStack.Push(hopOptions);
}
return(next);
}
protected IEnumerable <Hop> Step(HopOptions hopOptions)
{
while (hopOptions.OptionAvailable)
{
Hop hop = hopOptions.CurrrentHop;
UndoStack.Push(hop);
yield return(hop);
List <Hop> allowedHops = board.GetAllowedHops();
foreach (Hop nextHop in Step(new HopOptions(allowedHops)))
{
yield return(nextHop);
}
UndoStack.Pop();
board.UndoHopPeg(hop);
hopOptions.NextOptionIndex();
}
}