41 lines
1.1 KiB
C#
41 lines
1.1 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT License.
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// See the LICENSE file in the project root for more information.
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namespace System.Reactive.Linq.ObservableImpl
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{
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internal sealed class IsEmpty<TSource> : Producer<bool, IsEmpty<TSource>._>
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{
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private readonly IObservable<TSource> _source;
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public IsEmpty(IObservable<TSource> source)
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{
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_source = source;
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}
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protected override _ CreateSink(IObserver<bool> observer) => new(observer);
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protected override void Run(_ sink) => sink.Run(_source);
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internal sealed class _ : Sink<TSource, bool>
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{
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public _(IObserver<bool> observer)
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: base(observer)
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{
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}
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public override void OnNext(TSource value)
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{
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ForwardOnNext(false);
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ForwardOnCompleted();
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}
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public override void OnCompleted()
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{
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ForwardOnNext(true);
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ForwardOnCompleted();
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}
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}
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}
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}
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