/// <summary>
/// Initializes a new interval.
/// </summary>
/// <param name="lower">The lower interval limit, or null if unbounded.</param>
/// <param name="upper">The upper interval limit, or null if unbounded.</param>
public Interval(Limit <T> lower, Limit <T> upper)
{
(LowerLimit = lower).Position = Position.Lower;
(UpperLimit = upper).Position = Position.Upper;
}
public int CompareTo(Limit <T> other)
{
throw new NotImplementedException();
}
public static bool LessThan <T>(this Limit <T> @this, Limit <T> other) where T : IComparable <T>, IEquatable <T>
{
if (@this.LowerInfinite) // assuming @this.LowerInfinite
{
return(other != null && other.Lower);
}
if (other == null) // assuming other.UpperInfinite
{
return(@this.Upper);
}
if (@this.Value.Equals(other.Value))
{
if (@this.Lower)
{
if (@this.Closed)
{
// [---
// [--- false
// (--- true
// ---) false
// ---] false
return(other.Lower && other.Open);
}
// else @this.Open
// (---
// [--- false
// (--- false
// ---) false
// ---] false
return(false);
}
if (@this.Upper)
{
if (@this.Open)
{
// ---)
// [--- true
// (--- true
// ---) false
// ---] true
return(other.Lower || other.Closed);
}
// else @this.Closed
// ---]
// [--- false
// (--- true
// ---) false
// ---] false
return(other.Lower && other.Open);
}
// else @this.Position == Position.Undefined
}
return(@this.Value.CompareTo(other.Value) < 0);
}
