/// <summary> <!-- {{{1 --> Convert SudokuValue to String
/// </summary>
/// <param name="self"></param>
/// <returns></returns>
public static string ToStr(this SudokuValue self)
{
if (self.IsInvalid())
{
return(".");
}
return(self.ToInt().ToString());
}
/// <summary> <!-- {{{1 --> Constructor
/// </summary>
/// <param name="initial"></param>
public Value(SudokuValue initial)
{
if (!initial.IsNA() && initial.IsInvalid())
{
var msg = string.Format("Invalid value: {0}", initial.ToStr());
throw new ArgumentOutOfRangeException(msg);
}
this.v = initial;
}
/// <summary> <!-- {{{1 --> Return true if the value is valid.
/// </summary>
/// <param name="self"></param>
/// <returns></returns>
public static bool IsValid(this SudokuValue self)
{
return(!self.IsInvalid());
}