Func <Hint, bool> HintIsAt(int selx, int sely)
{
return((Hint hint) =>
{
SudokuRequirement r = (SudokuRequirement)hint.Requirement;
if (r != null)
{
return r.AppliesAt(selx, sely, this);
}
SudokuCandidate c = (SudokuCandidate)hint.Candidate;
if (c != null)
{
return c.x == selx && c.y == sely;
}
return false;
});
}
static bool AppliesAt(Hint hint, int x, int y, SudokuGrid grid)
{
if (!(hint is ForcedMoveHint))
{
SudokuCandidate k = (SudokuCandidate)hint.Candidate;
if (k != null)
{
return(k.x == x && k.y == y);
}
}
SudokuRequirement c = (SudokuRequirement)hint.Requirement;
if (c != null)
{
return(c.AppliesAt(x, y, grid));
}
return(false);
}