89 lines
3.1 KiB
C#
89 lines
3.1 KiB
C#
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#region Copyright notice and license
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// Protocol Buffers - Google's data interchange format
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// Copyright 2017 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#endregion
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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namespace LC.Google.Protobuf.Collections
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{
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/// <summary>
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/// Utility to compare if two Lists are the same, and the hash code
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/// of a List.
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/// </summary>
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public static class Lists
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{
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/// <summary>
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/// Checks if two lists are equal.
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/// </summary>
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public static bool Equals<T>(List<T> left, List<T> right)
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{
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if (left == right)
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{
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return true;
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}
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if (left == null || right == null)
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{
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return false;
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}
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if (left.Count != right.Count)
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{
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return false;
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}
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IEqualityComparer<T> comparer = EqualityComparer<T>.Default;
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for (int i = 0; i < left.Count; i++)
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{
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if (!comparer.Equals(left[i], right[i]))
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{
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return false;
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}
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}
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return true;
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}
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/// <summary>
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/// Gets the list's hash code.
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/// </summary>
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public static int GetHashCode<T>(List<T> list)
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{
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if (list == null)
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{
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return 0;
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}
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int hash = 31;
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foreach (T element in list)
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{
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hash = hash * 29 + element.GetHashCode();
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}
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return hash;
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}
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}
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}
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