mcs/tests/gtest-397.cs

   1 using System;
   2
   3 struct Foo
   4 {
   5         public int Value;
   6
   7         public Foo (int value)
   8         {
   9                 this.Value = value;
  10         }
  11
  12         public static Foo operator - (Foo? f)
  13         {
  14                 if (f.HasValue)
  15                         return new Foo (-f.Value.Value);
  16
  17                 return new Foo (42);
  18         }
  19 }
  20
  21 struct Bar
  22 {
  23         public int Value;
  24
  25         public Bar (int value)
  26         {
  27                 this.Value = value;
  28         }
  29
  30         public static Bar? operator - (Bar? b)
  31         {
  32                 if (b.HasValue)
  33                         return new Bar (-b.Value.Value);
  34
  35                 return b;
  36         }
  37 }
  38
  39 class Test
  40 {
  41
  42         static Foo NegateFoo (Foo f)
  43         {
  44                 return -f;
  45         }
  46
  47         static Foo NegateFooNullable (Foo? f)
  48         {
  49                 return -f;
  50         }
  51
  52         static Bar? NegateBarNullable (Bar? b)
  53         {
  54                 return -b;
  55         }
  56
  57         static Bar? NegateBar (Bar b)
  58         {
  59                 return -b;
  60         }
  61
  62         public static int Main ()
  63         {
  64                 if (NegateFooNullable (null).Value != 42)
  65                         return 1;
  66
  67                 if (NegateFoo (new Foo (2)).Value != -2)
  68                         return 2;
  69
  70                 if (NegateBarNullable (null) != null)
  71                         return 3;
  72
  73                 if (NegateBar (new Bar (2)).Value.Value != -2)
  74                         return 4;
  75
  76                 Console.WriteLine ("OK");
  77                 return 0;
  78         }
  79 }