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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
#if NO_RXINTERFACES
namespace System
{
/// <summary>
/// Supports push-style iteration over an observable sequence.
/// </summary>
#if !NO_VARIANCE
public interface IObserver<in T>
#else
public interface IObserver<T>
#endif
{
/// <summary>
/// Notifies the observer of a new element in the sequence.
/// </summary>
/// <param name="value">Next element in the sequence.</param>
void OnNext(T value);
/// <summary>
/// Notifies the observer that an exception has occurred.
/// </summary>
/// <param name="error">The error that has occurred.</param>
void OnError(Exception error);
/// <summary>
/// Notifies the observer of the end of the sequence.
/// </summary>
void OnCompleted();
}
}
#elif !WINDOWSPHONE7 // TypeForwardedTo is not presen on windows phone 7 so we can't really target
[assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.IObserver<>))]
#endif
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