36 lines
1.4 KiB
C#
36 lines
1.4 KiB
C#
/*
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Copyright (C) 2014-2019 de4dot@gmail.com
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This file is part of dnSpy
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dnSpy is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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dnSpy is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with dnSpy. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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namespace dnSpy.Debugger.DotNet.Metadata {
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static class ReadOnlyCollectionHelpers {
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public static ReadOnlyCollection<T> Empty<T>() => EmptyClass<T>.Empty;
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public static ReadOnlyCollection<T> Create<T>(T[]? array) =>
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array is null || array.Length == 0 ? EmptyClass<T>.Empty : new ReadOnlyCollection<T>(array);
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public static ReadOnlyCollection<T> Create<T>(IList<T>? list) =>
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list is null || list.Count == 0 ? EmptyClass<T>.Empty : list as ReadOnlyCollection<T> ?? new ReadOnlyCollection<T>(list);
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static class EmptyClass<T> {
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internal static readonly ReadOnlyCollection<T> Empty = new ReadOnlyCollection<T>(Array.Empty<T>());
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}
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}
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}
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