61 lines
2.3 KiB
C#
61 lines
2.3 KiB
C#
// This file is part of YamlDotNet - A .NET library for YAML.
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// Copyright (c) Antoine Aubry and contributors
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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// of the Software, and to permit persons to whom the Software is furnished to do
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// so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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namespace YamlDotNet.Core
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{
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/// <summary>
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/// Supports implementations of <see cref="object.GetHashCode"/> by providing methods to combine two hash codes.
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/// </summary>
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internal static class HashCode
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{
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/// <summary>
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/// Combines two hash codes.
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/// </summary>
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/// <param name="h1">The first hash code.</param>
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/// <param name="h2">The second hash code.</param>
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/// <returns></returns>
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public static int CombineHashCodes(int h1, int h2)
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{
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return ((h1 << 5) + h1) ^ h2;
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}
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public static int CombineHashCodes(int h1, object? o2)
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{
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return CombineHashCodes(h1, GetHashCode(o2));
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}
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public static int CombineHashCodes(object? first, params object?[] others)
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{
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var hashCode = GetHashCode(first);
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foreach (var other in others)
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{
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hashCode = CombineHashCodes(hashCode, other);
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}
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return hashCode;
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}
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private static int GetHashCode(object? obj)
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{
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return obj != null ? obj.GetHashCode() : 0;
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}
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}
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}
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