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

   1 // ==++==
   2 //
   3 //   Copyright (c) Microsoft Corporation.  All rights reserved.
   4 //
   5 // ==--==
   6 // =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
   7 //
   8 // PairComparer.cs
   9 //
  10 // <OWNER>Microsoft</OWNER>
  11 //
  12 // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
  13
  14 using System.Collections.Generic;
  15
  16 namespace System.Linq.Parallel
  17 {
  18     /// <summary>
  19     /// PairComparer compares pairs by the first element, and breaks ties by the second
  20     /// element.
  21     /// </summary>
  22     /// <typeparam name="T"></typeparam>
  23     /// <typeparam name="U"></typeparam>
  24     internal class PairComparer<T, U> : IComparer<Pair<T, U>>
  25     {
  26         private IComparer<T> m_comparer1;
  27         private IComparer<U> m_comparer2;
  28
  29         public PairComparer(IComparer<T> comparer1, IComparer<U> comparer2)
  30         {
  31             m_comparer1 = comparer1;
  32             m_comparer2 = comparer2;
  33         }
  34
  35         public int Compare(Pair<T, U> x, Pair<T, U> y)
  36         {
  37             int result1 = m_comparer1.Compare(x.First, y.First);
  38             if (result1 != 0)
  39             {
  40                 return result1;
  41             }
  42
  43             return m_comparer2.Compare(x.Second, y.Second);
  44         }
  45     }
  46 }