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
  27 class C
  28 {
  29         static int Main()
  30         {
  31                 Foo f;
  32                 Expression<Func<bool>> e = () => f > null;
  33                 if (e.Compile ().Invoke ())
  34                         return 1;
  35
  36                 e = () => f < null;
  37                 if (e.Compile ().Invoke ())
  38                         return 2;
  39
  40                 e = () => f == null;
  41                 if (e.Compile ().Invoke ())
  42                         return 3;
  43
  44                 e = () => f != null;
  45                 if (!e.Compile ().Invoke ())
  46                         return 4;
  47
  48                 Console.WriteLine ("OK");
  49                 return 0;
  50         }
  51 }