public _(If <TResult> parent, IObserver <TResult> observer) : base(observer) { _parent = parent; }
public _(If <TResult> parent, IObserver <TResult> observer, IDisposable cancel) : base(observer, cancel) { _parent = parent; }
public _(If <TResult> parent, IObserver <TResult> observer) : base(observer) { _parent = parent; }
public _(If <TResult> parent, IObserver <TResult> observer, IDisposable cancel) : base(observer, cancel) { _parent = parent; }