42 lines
945 B
C#
42 lines
945 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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namespace OpenRA.Primitives
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{
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public class CachedTransform<T, U>
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{
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readonly Func<T, U> transform;
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bool initialized;
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T lastInput;
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U lastOutput;
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public CachedTransform(Func<T, U> transform)
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{
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this.transform = transform;
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}
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public U Update(T input)
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{
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if (initialized && ((input == null && lastInput == null) || (input != null && input.Equals(lastInput))))
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return lastOutput;
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lastInput = input;
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lastOutput = transform(input);
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initialized = true;
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return lastOutput;
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}
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}
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}
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