mcs/tests/gtest-etree-04.cs

   1 using System;
   2 using System.Linq.Expressions;
   3
   4 struct Foo
   5 {
   6         public static bool operator > (Foo d1, Foo d2)
   7         {
   8                 throw new ApplicationException ();
   9         }
  10
  11         public static bool operator < (Foo d1, Foo d2)
  12         {
  13                 throw new ApplicationException ();
  14         }
  15
  16         public static bool operator == (Foo d1, Foo d2)
  17         {
  18                 throw new ApplicationException ();
  19         }
  20
  21         public static bool operator != (Foo d1, Foo d2)
  22         {
  23                 throw new ApplicationException ();
  24         }
  25
  26         public static Foo operator + (Foo d1, Foo d2)
  27         {
  28                 throw new ApplicationException ();
  29         }
  30 }
  31
  32 class C
  33 {
  34         public static int Main()
  35         {
  36                 Foo f;
  37                 Expression<Func<bool>> e = () => f > null;
  38                 if (e.Compile ().Invoke ())
  39                         return 1;
  40
  41                 e = () => f < null;
  42                 if (e.Compile ().Invoke ())
  43                         return 2;
  44
  45                 e = () => f == null;
  46                 if (e.Compile ().Invoke ())
  47                         return 3;
  48
  49                 e = () => f != null;
  50                 if (!e.Compile ().Invoke ())
  51                         return 4;
  52
  53                 Expression<Func<Foo?>> e2 = () => f + null;
  54                 if (e2.Compile ().Invoke () != null)
  55                         return 5;
  56
  57                 Console.WriteLine ("OK");
  58                 return 0;
  59         }
  60 }