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