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-rw-r--r--csharp/ProtocolBuffers/Collections/Lists.cs56
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diff --git a/csharp/ProtocolBuffers/Collections/Lists.cs b/csharp/ProtocolBuffers/Collections/Lists.cs
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--- a/csharp/ProtocolBuffers/Collections/Lists.cs
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-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.
-// http://code.google.com/p/protobuf/
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-using System.Collections.Generic;
-using System.Collections.ObjectModel;
-
-namespace Google.ProtocolBuffers.Collections {
-
- /// <summary>
- /// Utility non-generic class for calling into Lists{T} using type inference.
- /// </summary>
- public static class Lists {
-
- /// <summary>
- /// Returns a read-only view of the specified list.
- /// </summary>
- public static IList<T> AsReadOnly<T>(IList<T> list) {
- return Lists<T>.AsReadOnly(list);
- }
- }
-
- /// <summary>
- /// Utility class for dealing with lists.
- /// </summary>
- public static class Lists<T> {
-
- static readonly ReadOnlyCollection<T> empty = new ReadOnlyCollection<T>(new T[0]);
-
- /// <summary>
- /// Returns an immutable empty list.
- /// </summary>
- public static ReadOnlyCollection<T> Empty {
- get { return empty; }
- }
-
- /// <summary>
- /// Returns either the original reference if it's already read-only,
- /// or a new ReadOnlyCollection wrapping the original list.
- /// </summary>
- public static IList<T> AsReadOnly(IList<T> list) {
- return list.IsReadOnly ? list : new ReadOnlyCollection<T>(list);
- }
- }
-}