30 lines
845 B
C#
30 lines
845 B
C#
#region Copyright & License Information
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/*
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* Copyright (c) The OpenRA Developers and Contributors
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version. For more
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* information, see COPYING.
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*/
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#endregion
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using System;
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using System.Collections.Generic;
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namespace OpenRA.Mods.Common.UtilityCommands
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{
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public static class Extensions
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{
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public static IEnumerable<TSource> DistinctBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector)
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{
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var knownKeys = new HashSet<TKey>();
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foreach (var element in source)
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{
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if (knownKeys.Add(keySelector(element)))
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yield return element;
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}
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}
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}
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}
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