81 lines
1.9 KiB
C#
81 lines
1.9 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2017 The OpenRA Developers (see AUTHORS)
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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
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{
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/// <summary>
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/// A minimal read only list interface for .NET 4
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/// </summary>
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/// <remarks>
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/// .NET 4.5 has an implementation built-in, this code is not meant to
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/// duplicate it but provide a compatible interface that can be replaced
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/// when we switch to .NET 4.5 or higher.
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/// </remarks>
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public interface IReadOnlyList<out T> : IEnumerable<T>
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{
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int Count { get; }
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T this[int index] { get; }
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}
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public static class ReadOnlyList
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{
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public static IReadOnlyList<T> AsReadOnly<T>(this IList<T> list)
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{
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return list as IReadOnlyList<T> ?? new ReadOnlyList<T>(list);
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}
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}
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/// <summary>
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/// A minimal read only list for .NET 4 implemented as a wrapper
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/// around an IList.
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/// </summary>
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public class ReadOnlyList<T> : IReadOnlyList<T>
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{
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private readonly IList<T> list;
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public ReadOnlyList()
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: this(new List<T>())
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{
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}
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public ReadOnlyList(IList<T> list)
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{
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if (list == null)
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throw new ArgumentNullException("list");
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this.list = list;
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}
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#region IEnumerable implementation
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public IEnumerator<T> GetEnumerator()
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{
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return list.GetEnumerator();
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}
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#endregion
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#region IEnumerable implementation
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System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
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{
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return list.GetEnumerator();
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}
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#endregion
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#region IReadOnlyList implementation
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public int Count { get { return list.Count; } }
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public T this[int index] { get { return list[index]; } }
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#endregion
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}
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}
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