public IEnumerable <LevelState> GetPossibleNextStates()
{
LevelState copy = Clone();
int[] dxs = { 1, -1, 0, 0 };
int[] dys = { 0, 0, 1, -1 };
for (int i = 0; i < 4; i++)
{
if (copy.Move(dxs[i], dys[i]))
{
yield return(copy);
copy = Clone();
}
}
if (copy.Pass())
{
yield return(copy);
}
// Copy if continuing
}
public bool Pass()
{
return(Act(() => currentState.Pass()));
}
