namespace System.Reactive.Linq.ObservableImpl { internal sealed class MinInt32Nullable : Producer<int?, MinInt32Nullable._> { internal sealed class _ : IdentitySink<int?> { private int? _lastValue; public _(IObserver<int?> observer) : base(observer) { } public override void OnNext(int? value) { if (value.HasValue) { if (_lastValue.HasValue) { int? nullable = value; int? lastValue = _lastValue; if ((nullable.GetValueOrDefault() < lastValue.GetValueOrDefault()) & (nullable.HasValue & lastValue.HasValue)) _lastValue = value; } else _lastValue = value; } } public override void OnCompleted() { ForwardOnNext(_lastValue); ForwardOnCompleted(); } } private readonly IObservable<int?> _source; public MinInt32Nullable(IObservable<int?> source) { _source = source; } protected override _ CreateSink(IObserver<int?> observer) { return new _(observer); } protected override void Run(_ sink) { sink.Run(_source); } } }