Range.cs

using System;

namespace Diuturnal {
  [Serializable]
  public class Range<T> where T : IComparable<T> {
    private T _start;
    private T _end;

    public Range(T first, T second) {
      if (first.CompareTo(second) > 0) {
        _start = second;
        _end = first;
      }
      else {
        _start = first;
        _end = second;
      }
    }

    public T Start {
      get { return _start; }
    }

    public T End {
      get { return _end; }
    }

    public bool Contains(T value) {
      return (_start.CompareTo(value) <= 0 && value.CompareTo(_end) <= 0);
    }

    public bool Overlaps(Range<T> other) {
      return Range.Overlap<T>(this, other);
    }
  }

  public static class Range {
    public static bool Overlap<T>(Range<T> first, Range<T> second) where T : IComparable<T> {
      return second.End.CompareTo(first.Start) >= 0 && first.End.CompareTo(second.Start) >= 0;
    }
  }
}