/// <summary>
/// Produces the <see cref="ComparisonOperator"/> that is logically opposite another.
/// </summary>
/// <param name="self">
/// The <see cref="ComparisonOperator"/> on which the extension method is invoked.
/// </param>
/// <returns>
/// The logical opposite of <paramref name="self"/>.
/// </returns>
public static ComparisonOperator Negation(this ComparisonOperator self)
{
Debug.Assert(self.IsValid());
return(self switch {
ComparisonOperator.EQ => ComparisonOperator.NE,
ComparisonOperator.NE => ComparisonOperator.EQ,
ComparisonOperator.LT => ComparisonOperator.GTE,
ComparisonOperator.GT => ComparisonOperator.LTE,
ComparisonOperator.LTE => ComparisonOperator.GT,
ComparisonOperator.GTE => ComparisonOperator.LT,
_ => throw new ApplicationException($"Switch statement over {nameof(ComparisonOperator)} exhausted"),
});