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  1. using System;
  2. using System.Collections.Generic;
  3.  
  4. public class Test
  5. {
  6.     public static void Main()
  7.     {
  8.         var x = new Int16_2D { a = 1, b = 2 }; 
  9.         var set = new HashSet<Int16_2D> { x }; 
  10.  
  11.         var y = new Int16_2D { a = 1, b = 2 }; 
  12.         Console.WriteLine(set.Contains(y));   // True 
  13.  
  14.         x.a = 3; 
  15.         Console.WriteLine(set.Contains(y));   // False 
  16.         Console.WriteLine(set.Contains(x));   // False! 
  17.  
  18.     }
  19. }
  20.  
  21. public class Int16_2D   
  22. {   
  23.     public Int16 a, b;   
  24.  
  25.     public override bool Equals(Object other)   
  26.     {   
  27.         return other is Int16_2D &&   
  28.         a == ((Int16_2D)other).a &&   
  29.         b == ((Int16_2D)other).b;   
  30.     }
  31.  
  32.     public override int GetHashCode()
  33.     {
  34.         return a | (int)b * 65536;
  35.     }   
  36. }
Success #stdin #stdout 0.04s 36960KB
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https://ideone.com/QQw08
language:
C# (gmcs 5.20.1)
created:
13 years ago
visibility:
public

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