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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
using System;
using System.Threading.Tasks;
using System.Threading;
namespace System.Collections.Generic
{
/// <summary>
/// Asynchronous version of the IEnumerator<T> interface, allowing elements to be
/// retrieved asynchronously.
/// </summary>
/// <typeparam name="T">Element type.</typeparam>
public interface IAsyncEnumerator<
#if DESKTOPCLR40 || SILVERLIGHT4
out
#endif
T> : IDisposable
{
/// <summary>
/// Advances the enumerator to the next element in the sequence, returning the result asynchronously.
/// </summary>
/// <param name="cancellationToken">Cancellation token that can be used to cancel the operation.</param>
/// <returns>
/// Task containing the result of the operation: true if the enumerator was successfully advanced
/// to the next element; false if the enumerator has passed the end of the sequence.
/// </returns>
Task<bool> MoveNext(CancellationToken cancellationToken);
/// <summary>
/// Gets the current element in the iteration.
/// </summary>
T Current { get; }
}
}
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