namespace System.Reactive.Linq.ObservableImpl { internal sealed class AsObservable<TSource> : Producer<TSource, AsObservable<TSource>._>, IEvaluatableObservable<TSource> { internal sealed class _ : IdentitySink<TSource> { public _(IObserver<TSource> observer) : base(observer) { } } private readonly IObservable<TSource> _source; public AsObservable(IObservable<TSource> source) { _source = source; } public IObservable<TSource> Eval() { return _source; } protected override _ CreateSink(IObserver<TSource> observer) { return new _(observer); } protected override void Run(_ sink) { sink.Run(_source); } } }