using System.Runtime.CompilerServices; namespace System.Reactive.Linq.ObservableImpl { [System.Runtime.CompilerServices.NullableContext(1)] [System.Runtime.CompilerServices.Nullable(new byte[] { 0, 1 })] internal sealed class AverageDoubleNullable : Producer<double?, AverageDoubleNullable._> { [System.Runtime.CompilerServices.NullableContext(0)] internal sealed class _ : IdentitySink<double?> { private double _sum; private long _count; [System.Runtime.CompilerServices.NullableContext(1)] public _(IObserver<double?> observer) : base(observer) { _sum = 0; _count = 0; } public override void OnNext(double? value) { try { if (value.HasValue) { _sum += value.Value; checked { _count++; } } } catch (Exception error) { ForwardOnError(error); } } public override void OnCompleted() { if (_count > 0) ForwardOnNext(_sum / (double)_count); else ForwardOnNext(null); ForwardOnCompleted(); } } private readonly IObservable<double?> _source; public AverageDoubleNullable(IObservable<double?> source) { _source = source; } protected override _ CreateSink(IObserver<double?> observer) { return new _(observer); } protected override void Run(_ sink) { sink.Run(_source); } } }