Transform each input element into an Enumerable of output elements that is then flattened into the output stream. The transformation is meant to be stateful, which is enabled by creating the transformation function mapConcaterFactory a new for every materialization — the returned function will typically close over mutable objects to store state between invocations. For the stateless variant see SelectManyTOut1, TOut2, TMat(SourceTOut1, TMat, FuncTOut1, IEnumerableTOut2). The returned Enumerable MUST NOT contain null values, as they are illegal as stream elements - according to the Reactive Streams specification.

Emits when the mapping function returns an element or there are still remaining elements from the previously calculated collection

Backpressures when downstream backpressures or there are still remaining elements from the previously calculated collection

Completes when upstream completes and all remaining elements has been emitted

Cancels when downstream cancels

See also SelectManyTOut1, TOut2, TMat(SourceTOut1, TMat, FuncTOut1, IEnumerableTOut2)

public static Source<TOut2, TMat> StatefulSelectMany<TOut1, TOut2, TMat>(
	this Source<TOut1, TMat> flow,
	Func<Func<TOut1, IEnumerable<TOut2>>> mapConcaterFactory
)

[<ExtensionAttribute>]
static member StatefulSelectMany : 
        flow : Source<'TOut1, 'TMat> * 
        mapConcaterFactory : Func<Func<'TOut1, IEnumerable<'TOut2>>> -> Source<'TOut2, 'TMat>