mcs/tests/test-924.cs

   1 using System;
   2
   3 class MainClass
   4 {
   5         public static int Main ()
   6         {
   7                 DataFrame df1 = new DataFrame ();
   8                 DataFrame df2 = new DataFrame ();
   9
  10                 if (df1 != null)
  11                 {
  12                         return 1;
  13                 }
  14
  15                 return 0;
  16         }
  17
  18         public class DataFrame
  19         {
  20                 public static bool operator ==(DataFrame df1, DataFrame df2)
  21                 {
  22                         return df1 is DataFrame;
  23                 }
  24
  25                 public static bool operator !=(DataFrame df1, DataFrame df2)
  26                 {
  27                         return !(df1 == df2);
  28                 }
  29         }
  30 }