#region Copyright (c) 2009 S. van Deursen
/* The CuttingEdge.Conditions library enables developers to validate pre- and postconditions in a fluent
* manner.
*
* To contact me, please visit my blog at http://www.cuttingedge.it/blogs/steven/
*
* Copyright (c) 2009 S. van Deursen
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
* associated documentation files (the "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the
* following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
* LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
* EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#endregion
using System;
using System.Collections.Generic;
namespace CuttingEdge.Conditions.UnitTests.CollectionTests
{
/// <summary>
/// Represents a <see cref="Int32"/> comparison operation that uses specific an odd-even comparison rule.
/// Two values are considered equal when they are both even or both odd.
/// </summary>
/// <remarks>
/// This equality comparer is used within the collection tests to determine whether the Contains,
/// ContainsAny, and ContainsAll methods operate correctly with collections that implement equality
/// differently.
/// </remarks>
internal sealed class OddEqualityComparer : IEqualityComparer<int>
{
public bool Equals(int x, int y)
{
return IsEven(x) == IsEven(y);
}
public int GetHashCode(int obj)
{
return IsEven(obj).GetHashCode();
}
private static bool IsEven(int value)
{
return (value % 2) == 0;
}
}
}