namespace System.Reactive.Linq.ObservableImpl { internal sealed class MaxSingleNullable : Producer<float?, MaxSingleNullable._> { internal sealed class _ : IdentitySink<float?> { private float? _lastValue; public _(IObserver<float?> observer) : base(observer) { } public override void OnNext(float? value) { if (value.HasValue) { if (_lastValue.HasValue) { float? nullable = value; float? lastValue = _lastValue; if (((nullable.GetValueOrDefault() > lastValue.GetValueOrDefault()) & (nullable.HasValue & lastValue.HasValue)) || float.IsNaN(value.Value)) _lastValue = value; } else _lastValue = value; } } public override void OnCompleted() { ForwardOnNext(_lastValue); ForwardOnCompleted(); } } private readonly IObservable<float?> _source; public MaxSingleNullable(IObservable<float?> source) { _source = source; } protected override _ CreateSink(IObserver<float?> observer) { return new _(observer); } protected override void Run(_ sink) { sink.Run(_source); } } }