/// <summary>
/// Determines how this Fraction, of an indeterminate type, compares to another Fraction
/// </summary>
/// <param name="leftType">What kind of indeterminate</param>
/// <param name="right">The other Fraction to compare against</param>
/// <returns>-1 if this is less than <paramref name="right"></paramref>,
/// 0 if they are equal,
/// 1 if this is greater than <paramref name="right"></paramref></returns>
/// <remarks>NaN is less than anything except NaN and Negative Infinity. Negative Infinity is less
/// than anything except Negative Infinity. Positive Infinity is greater than anything except
/// Positive Infinity.</remarks>
private static int IndeterminantCompare(Indeterminates leftType, Fraction right)
{
switch (leftType)
{
case Indeterminates.NaN:
// A NaN is...
if (right.IsNaN())
return 0; // equal to a NaN
else if (right.IsNegativeInfinity())
return 1; // great than Negative Infinity
else
return -1; // less than anything else
case Indeterminates.NegativeInfinity:
// Negative Infinity is...
if (right.IsNegativeInfinity())
return 0; // equal to Negative Infinity
else
return -1; // less than anything else
case Indeterminates.PositiveInfinity:
if (right.IsPositiveInfinity())
return 0; // equal to Positive Infinity
else
return 1; // greater than anything else
default:
// this CAN'T happen, something VERY wrong is going on...
return 0;
}
}