mcs/tests/test-52.cs

   1 //
   2 // Tests the foreach on strings, and tests the implicit use of foreach
   3 // to pull the enumerator from the class and identify the pattern to be called
   4 //
   5 using System;
   6 using System.Collections;
   7
   8 class Y {
   9         int count = 0;
  10
  11         public bool MoveNext ()
  12         {
  13                 count++;
  14                 return count != 10;
  15         }
  16
  17         public object Current {
  18                 get {
  19                         return count;
  20                 }
  21         }
  22 }
  23
  24 class X {
  25
  26         static string [] a = {
  27                 "one", "two", "three"
  28         };
  29
  30         public Y GetEnumerator ()
  31         {
  32                 return new Y ();
  33         }
  34
  35         public static int Main ()
  36         {
  37                 //
  38                 // String test
  39                 //
  40                 string total = "";
  41
  42                 foreach (string s in a){
  43                         total = total + s;
  44                 }
  45                 if (total != "onetwothree")
  46                         return 1;
  47
  48                 //
  49                 // Pattern test
  50                 //
  51                 X x = new X ();
  52
  53                 int t = 0;
  54                 foreach (object o in x){
  55                         t += (int) o;
  56                 }
  57                 if (t != 45)
  58                         return 2;
  59
  60                 //
  61                 // Looking for GetEnumerator on interfaces test
  62                 //
  63                 Hashtable xx = new Hashtable ();
  64                 xx.Add ("A", 10);
  65                 xx.Add ("B", 20);
  66
  67                 IDictionary vars = xx;
  68                 string total2 = "";
  69                 foreach (string name in vars.Keys){
  70                         total2 = total2 + name;
  71                 }
  72
  73                 if ((total2 != "AB") && (total2 != "BA"))
  74                         return 3;
  75
  76                 ArrayList list = new ArrayList ();
  77                 list.Add ("one");
  78                 list.Add ("two");
  79                 list.Add ("three");
  80                 int count = 0;
  81
  82                 //
  83                 // This test will make sure that `break' inside foreach will
  84                 // actually use a `leave' opcode instead of a `br' opcode
  85                 //
  86                 foreach (string s in list){
  87                         if (s == "two"){
  88                                 break;
  89                         }
  90                         count++;
  91                 }
  92                 if (count != 1)
  93                         return 4;
  94
  95                 Console.WriteLine ("test passes");
  96                 return 0;
  97         }
  98 }