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diff --git a/csharp/src/Google.Protobuf/Reflection/DescriptorUtil.cs b/csharp/src/Google.Protobuf/Reflection/DescriptorUtil.cs
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-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc. All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using System.Collections.Generic;
-using System.Collections.ObjectModel;
-
-namespace Google.Protobuf.Reflection
-{
- /// <summary>
- /// Internal class containing utility methods when working with descriptors.
- /// </summary>
- internal static class DescriptorUtil
- {
- /// <summary>
- /// Equivalent to Func[TInput, int, TOutput] but usable in .NET 2.0. Only used to convert
- /// arrays.
- /// </summary>
- internal delegate TOutput IndexedConverter<TInput, TOutput>(TInput element, int index);
-
- /// <summary>
- /// Converts the given array into a read-only list, applying the specified conversion to
- /// each input element.
- /// </summary>
- internal static IList<TOutput> ConvertAndMakeReadOnly<TInput, TOutput>
- (IList<TInput> input, IndexedConverter<TInput, TOutput> converter)
- {
- TOutput[] array = new TOutput[input.Count];
- for (int i = 0; i < array.Length; i++)
- {
- array[i] = converter(input[i], i);
- }
- return new ReadOnlyCollection<TOutput>(array);
- }
- }
-} \ No newline at end of file