mcs/tests/gtest-072.cs

   1 //-- ex-gen-logger
   2 //-- ex-gen-struct-pair
   3 //-- ex-gen-logging-pairs
   4 // 1.2 alpha
   5
   6 using System;
   7
   8 public class Log<T> {
   9   private const int SIZE = 5;
  10   private static int instanceCount = 0;
  11   private int count = 0;
  12   private T[] log = new T[SIZE];
  13   public Log() { instanceCount++; }
  14   public static int InstanceCount { get { return instanceCount; } }
  15   public void Add(T msg) { log[count++ % SIZE] = msg; }
  16   public int Count { get { return count; } }
  17   public T Last {
  18     get { // Return the last log entry, or null if nothing logged yet
  19       return count==0 ? default(T) : log[(count-1)%SIZE];
  20     }
  21     set { // Update the last log entry, or create one if nothing logged yet
  22       if (count==0)
  23         log[count++] = value;
  24       else
  25         log[(count-1)%SIZE] = value;
  26     }
  27   }
  28   public T[] All {
  29     get {
  30       int size = Math.Min(count, SIZE);
  31       T[] res = new T[size];
  32       for (int i=0; i<size; i++)
  33         res[i] = log[(count-size+i) % SIZE];
  34       return res;
  35     }
  36   }
  37 }
  38
  39 class TestLog {
  40     public static void Main(String[] args) {
  41       Log<String> log1 = new Log<String>();
  42       log1.Add("Reboot");
  43       log1.Add("Coffee");
  44       Log<DateTime> log2 = new Log<DateTime>();
  45       log2.Add(DateTime.Now);
  46       log2.Add(DateTime.Now.AddHours(1));
  47       DateTime[] dts = log2.All;
  48       // Printing both logs:
  49       foreach (String s in log1.All)
  50         Console.Write("{0}   ", s);
  51       Console.WriteLine();
  52       foreach (DateTime dt in dts)
  53         Console.Write("{0}   ", dt);
  54       Console.WriteLine();
  55       TestPairLog();
  56     }
  57
  58     public static void TestPairLog() {
  59       Log<Pair<DateTime,String>> log = new Log<Pair<DateTime,String>>();
  60       log.Add(new Pair<DateTime,String>(DateTime.Now, "Tea leaves"));
  61       log.Add(new Pair<DateTime,String>(DateTime.Now.AddMinutes(2), "Hot water"));
  62       log.Add(new Pair<DateTime,String>(DateTime.Now.AddMinutes(7), "Ready"));
  63       Pair<DateTime,String>[] allMsgs = log.All;
  64       foreach (Pair<DateTime,String> p in allMsgs)
  65         Console.WriteLine("At {0}: {1}", p.Fst, p.Snd);
  66     }
  67 }
  68
  69 public struct Pair<T,U> {
  70   public readonly T Fst;
  71   public readonly U Snd;
  72   public Pair(T fst, U snd) {
  73     this.Fst = fst;
  74     this.Snd = snd;
  75   }
  76 }