Gets the hash code for an object using a comparer. Correctly handles null. : IComparer « Class Interface « C# / C Sharp

1. C# / C Sharp
2. Class Interface
3. IComparer

Gets the hash code for an object using a comparer. Correctly handles null.

 

//******************************
// Written by Peter Golde
// Copyright (c) 2004-2007, Wintellect
//
// Use and restribution of this code is subject to the license agreement 
// contained in the file "License.txt" accompanying this file.
//******************************

using System;
using System.Collections;
using System.Collections.Generic;


namespace Wintellect.PowerCollections
{
  /// <summary>
  /// A holder class for various internal utility functions that need to be shared.
  /// </summary>
    internal static class Util
    {
        /// <summary>
        /// Gets the hash code for an object using a comparer. Correctly handles
        /// null.
        /// </summary>
        /// <param name="item">Item to get hash code for. Can be null.</param>
        /// <param name="equalityComparer">The comparer to use.</param>
        /// <returns>The hash code for the item.</returns>
        public static int GetHashCode<T>(T item, IEqualityComparer<T> equalityComparer)
        {
            if (item == null)
                return 0x1786E23C;
            else
                return equalityComparer.GetHashCode(item);
        }
   }
}

   
  

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