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  1. using System;
  2. using System.Collections.Generic;
  3.  
  4. public class Test
  5. {
  6.         public static void Main()
  7.         {
  8.            var c = new Counter<int>();
  9.            c.Increment(1);
  10.            c.Increment(2);
  11.            c.Increment(1);
  12.            c.Increment(1);
  13.            foreach (var kvp in c) {
  14.                Console.WriteLine(kvp);
  15.            }
  16.         }
  17.         public class Counter<T> : IEnumerable<KeyValuePair<T, int>> {
  18.         private Dictionary<T, int> counts = new Dictionary<T, int>();
  19.  
  20.         public void Increment(T key) {
  21.             int current;
  22.             bool exists = counts.TryGetValue(key, out current);
  23.             if (exists) {
  24.                 counts[key]++;
  25.             }
  26.             else {
  27.                 counts[key] = 1;
  28.             }
  29.         }
  30.  
  31.         IEnumerator<KeyValuePair<T, int>>
  32.             IEnumerable<KeyValuePair<T, int>>.GetEnumerator() {
  33.             return ((IEnumerable<KeyValuePair<T, int>>) counts).GetEnumerator();
  34.         }
  35.  
  36.         System.Collections.IEnumerator
  37.             System.Collections.IEnumerable.GetEnumerator() {
  38.             return counts.GetEnumerator();
  39.         }
  40.     }
  41. }
Success #stdin #stdout 0.05s 34032KB
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https://ideone.com/DLilFJ
language:
C# (gmcs 5.20.1)
created:
13 years ago
visibility:
public

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