tests/test-244.cs

   1 using System;
   2
   3 class Foo {
   4         static int t_count = 0, f_count = 0;
   5
   6         static int Main ()
   7         {
   8                 Console.WriteLine (t && f);
   9                 if (t_count != 1)
  10                         return 1;
  11                 if (f_count != 1)
  12                         return 2;
  13                 Console.WriteLine ();
  14                 Console.WriteLine (t && t);
  15                 if (t_count != 3)
  16                         return 3;
  17                 if (f_count != 1)
  18                         return 4;
  19                 Console.WriteLine ();
  20                 return 0;
  21         }
  22
  23         static MyBool t { get { Console.WriteLine ("t"); t_count++; return new MyBool (true); }}
  24         static MyBool f { get { Console.WriteLine ("f"); f_count++; return new MyBool (false); }}
  25 }
  26
  27 public struct MyBool {
  28         bool v;
  29
  30         public MyBool (bool v) { this.v = v; }
  31
  32         public static MyBool operator & (MyBool x, MyBool y) {
  33                 return new MyBool (x.v & y.v);
  34         }
  35
  36         public static MyBool operator | (MyBool x, MyBool y) {
  37                 return new MyBool (x.v | y.v);
  38         }
  39
  40         public static bool operator true (MyBool x) {
  41                 return x.v;
  42         }
  43
  44         public static bool operator false (MyBool x) {
  45                 return ! x.v;
  46         }
  47
  48         public override string ToString () { return v.ToString (); }
  49 }