wehub-resource-sync
49 lines
1.9 KiB
C#
49 lines
1.9 KiB
C#
/*
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* QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
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* Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System.Collections.Generic;
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using System.Linq;
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namespace QuantConnect.Util
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{
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/// <summary>
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/// An implementation of <see cref="IEqualityComparer{T}"/> for <see cref="List{T}"/>.
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/// Useful when using a <see cref="List{T}"/> as the key of a collection.
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/// </summary>
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/// <typeparam name="T">The list type</typeparam>
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public class ListComparer<T> : IEqualityComparer<IReadOnlyCollection<T>>
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{
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/// <summary>Determines whether the specified objects are equal.</summary>
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/// <returns>true if the specified objects are equal; otherwise, false.</returns>
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public bool Equals(IReadOnlyCollection<T> x, IReadOnlyCollection<T> y)
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{
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return x.SequenceEqual(y);
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}
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/// <summary>Returns a hash code for the specified object.</summary>
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/// <returns>A hash code for the specified object created from combining the hash
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/// code of all the elements in the collection.</returns>
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public int GetHashCode(IReadOnlyCollection<T> obj)
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{
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var hashCode = 0;
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foreach (var dateTime in obj)
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{
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hashCode = (hashCode * 397) ^ dateTime.GetHashCode();
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}
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return hashCode;
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}
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}
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}
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