/// <summary>
/// Compare facts by <see cref="FactParametersCodes.CalculateByRule"/>.
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
public static int CompareTo(this IFact x, IFact y)
{
if (x.IsCalculatedByRule())
{
if (!y.IsCalculatedByRule())
{
return(-1);
}
}
else if (y.IsCalculatedByRule())
{
return(1);
}
return(0);
}