concat

After completion of the original upstream the elements of the given source will be emitted.

Fan-in stages

Signature

def concat[U >: Out, Mat2](that: Graph[SourceShape[U], Mat2]): Repr[U]
def concatMat[U >: Out, Mat2, Mat3](that: Graph[SourceShape[U], Mat2])(matF: (Mat, Mat2) ⇒ Mat3): ReprMat[U, Mat3]

Description

After completion of the original upstream the elements of the given source will be emitted.

emits when the current stream has an element available; if the current input completes, it tries the next one

backpressures when downstream backpressures

completes when all upstreams complete

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