mcs/class/referencesource/System.Core/System/Linq/Parallel/Utils/ReverseComparer.cs

   1 // ==++==
   2 //
   3 //   Copyright (c) Microsoft Corporation.  All rights reserved.
   4 //
   5 // ==--==
   6 // =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
   7 //
   8 // ReverseComparer.cs
   9 //
  10 // <OWNER>Microsoft</OWNER>
  11 //
  12 // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
  13
  14 using System.Collections.Generic;
  15
  16 namespace System.Linq.Parallel
  17 {
  18     /// <summary>
  19     /// Comparer that wraps another comparer, and flips the result of each comparison to the
  20     /// opposite answer.
  21     /// </summary>
  22     /// <typeparam name="T"></typeparam>
  23     internal class ReverseComparer<T> : IComparer<T>
  24     {
  25         private IComparer<T> m_comparer;
  26
  27         internal ReverseComparer(IComparer<T> comparer)
  28         {
  29             m_comparer = comparer;
  30         }
  31
  32         public int Compare(T x, T y)
  33         {
  34             return -m_comparer.Compare(x, y);
  35         }
  36     }
  37 }