src/ProtocolBuffers/Descriptors/IndexedDescriptorBase.cs

// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// http://github.com/jskeet/dotnet-protobufs/
// Original C++/Java/Python code:
// http://code.google.com/p/protobuf/
//
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// modification, are permitted provided that the following conditions are
// met:
//
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using Google.ProtocolBuffers.DescriptorProtos;

namespace Google.ProtocolBuffers.Descriptors
{
    /// <summary>
    /// Base class for descriptors which are also indexed. This is all of them other than
    /// <see cref="FileDescriptor" />.
    /// </summary>
    public abstract class IndexedDescriptorBase<TProto, TOptions> : DescriptorBase<TProto, TOptions>
        where TProto : IMessage<TProto>, IDescriptorProto<TOptions>
    {
        private readonly int index;

        protected IndexedDescriptorBase(TProto proto, FileDescriptor file, string fullName, int index)
            : base(proto, file, fullName)
        {
            this.index = index;
        }

        /// <value>
        /// The index of this descriptor within its parent descriptor. 
        /// </value>
        /// <remarks>
        /// This returns the index of this descriptor within its parent, for
        /// this descriptor's type. (There can be duplicate values for different
        /// types, e.g. one enum type with index 0 and one message type with index 0.)
        /// </remarks>
        public int Index
        {
            get { return index; }
        }
    }
}