using System.Collections.Generic; namespace System.Reactive.Linq.ObservableImpl { internal sealed class Contains<TSource> : Producer<bool, Contains<TSource>._> { internal sealed class _ : Sink<TSource, bool> { private readonly TSource _value; private readonly IEqualityComparer<TSource> _comparer; public _(Contains<TSource> parent, IObserver<bool> observer) : base(observer) { _value = parent._value; _comparer = parent._comparer; } public override void OnNext(TSource value) { bool flag = false; try { flag = _comparer.Equals(value, _value); } catch (Exception error) { ForwardOnError(error); return; } if (flag) { ForwardOnNext(true); ForwardOnCompleted(); } } public override void OnCompleted() { ForwardOnNext(false); ForwardOnCompleted(); } } private readonly IObservable<TSource> _source; private readonly TSource _value; private readonly IEqualityComparer<TSource> _comparer; public Contains(IObservable<TSource> source, TSource value, IEqualityComparer<TSource> comparer) { _source = source; _value = value; _comparer = comparer; } protected override _ CreateSink(IObserver<bool> observer) { return new _(this, observer); } protected override void Run(_ sink) { sink.Run(_source); } } }