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  1. using System;
  2. using System.Collections.Generic;
  3.  
  4. public class Program
  5. {
  6. 	public class MyData : IEquatable<MyData>, IComparable<MyData>
  7. 	{
  8. 		public static implicit operator MyData(string s)    { var data = new MyData(); /* TODO */ return data; }
  9. 		public static implicit operator MyData(DateTime dt) { var data = new MyData(); /* TODO */ return data; }
  10. 		public static implicit operator MyData(int dt)      { var data = new MyData(); /* TODO */ return data; }
  11.  
  12. 		// implement IComparable<MyData> members...
  13. 		// implement IEquatable<MyData> members...
  14.  
  15. 		// override object.Equals()
  16. 		// override object.GetHashCode()
  17. 		public static bool operator <(MyData a, MyData b) { return Comparer<MyData>.Default.Compare(a,b) == -1; }
  18. 		public static bool operator >(MyData a, MyData b) { return Comparer<MyData>.Default.Compare(a,b) == +1; }
  19.  
  20. 		// e.g.: 
  21. 		// the desired default representation for comparisons, e.g. string?
  22. 		// use 'dynamic' on C# 4.0 and beyond
  23. 		private object/*dynamic*/ variant_data;
  24.  
  25. 		public int CompareTo(MyData other)
  26. 		{
  27. 			// TODO implement your own logic
  28. 			return GetHashCode().CompareTo(null != other ? other.GetHashCode() : 0);
  29. 		}
  30.  
  31. 		// TODO implement your own equality logic:
  32. 		public bool Equals(MyData other)
  33. 		{
  34. 			if (ReferenceEquals(null, other)) return false;
  35. 			if (ReferenceEquals(this, other)) return true;
  36. 			return Equals(other.variant_data, variant_data);
  37. 		}
  38.  
  39. 		public override bool Equals(object obj)
  40. 		{
  41. 			if (ReferenceEquals(null, obj)) return false;
  42. 			if (ReferenceEquals(this, obj)) return true;
  43. 			if (obj.GetType() != typeof (MyData)) return false;
  44. 			return Equals((MyData) obj);
  45. 		}
  46.  
  47. 		public override int GetHashCode() { return (variant_data != null ? variant_data.GetHashCode() : 0); }
  48. 		public static bool operator ==(MyData left, MyData right) { return Equals(left, right); }
  49. 		public static bool operator !=(MyData left, MyData right) { return !Equals(left, right); }
  50. 	}
  51.  
  52. 	public static void Main(string[] args)
  53. 	{
  54. 		var cmp = Comparer<MyData>.Default;
  55.  
  56. 		string s = "123";
  57. 		int i = 234;
  58. 		DateTime dt = DateTime.Now;
  59.  
  60. 		if (-1  == cmp.Compare(s, i))  Console.WriteLine("s < i"); 
  61. 		if (+1 == cmp.Compare(dt, i)) Console.WriteLine("dt > i");
  62.  
  63. 		// or even:
  64. 		if ((MyData) s > i) Console.WriteLine("s > i");
  65. 		if ((MyData) dt< i) Console.WriteLine("dt < i");
  66. 	}
  67. }
  68.  
Success #stdin #stdout 0.01s 37920KB
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https://ideone.com/WwI87
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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