using System.Collections.Generic; using System.Runtime.CompilerServices; namespace System.Reactive.Linq.ObservableImpl { [System.Runtime.CompilerServices.NullableContext(1)] [System.Runtime.CompilerServices.Nullable(new byte[] { 0, 1, 1, 1, 1 })] internal sealed class Distinct<[System.Runtime.CompilerServices.Nullable(2)] TSource, [System.Runtime.CompilerServices.Nullable(2)] TKey> : Producer<TSource, Distinct<TSource, TKey>._> { [System.Runtime.CompilerServices.Nullable(new byte[] { 0, 1 })] internal sealed class _ : IdentitySink<TSource> { private readonly Func<TSource, TKey> _keySelector; private readonly HashSet<TKey> _hashSet; public _(Distinct<TSource, TKey> parent, IObserver<TSource> observer) : base(observer) { _keySelector = parent._keySelector; _hashSet = new HashSet<TKey>(parent._comparer); } public override void OnNext(TSource value) { bool flag; try { TKey item = _keySelector(value); flag = _hashSet.Add(item); } catch (Exception error) { ForwardOnError(error); return; } if (flag) ForwardOnNext(value); } } private readonly IObservable<TSource> _source; private readonly Func<TSource, TKey> _keySelector; private readonly IEqualityComparer<TKey> _comparer; public Distinct(IObservable<TSource> source, Func<TSource, TKey> keySelector, IEqualityComparer<TKey> comparer) { _source = source; _keySelector = keySelector; _comparer = comparer; } [return: System.Runtime.CompilerServices.Nullable(new byte[] { 1, 0, 0 })] protected override _ CreateSink(IObserver<TSource> observer) { return new _(this, observer); } protected override void Run([System.Runtime.CompilerServices.Nullable(new byte[] { 1, 0, 0 })] _ sink) { sink.Run(_source); } } }