akka.stream.scaladsl

FlowOps

trait FlowOps[+Out, +Mat] extends AnyRef

Scala API: Operations offered by Sources and Flows with a free output side: the DSL flows left-to-right only.

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Flow.scala
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Type Members

  1. abstract type Repr[+O, +M] <: FlowOps[O, M]

Abstract Value Members

  1. abstract def withAttributes(attr: Attributes): Repr[Out, Mat]

Concrete Value Members

  1. final def !=(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  2. final def !=(arg0: Any): Boolean

    Definition Classes
    Any
  3. final def ##(): Int

    Definition Classes
    AnyRef → Any
  4. def +(other: String): String

    Implicit information
    This member is added by an implicit conversion from FlowOps[Out, Mat] to StringAdd performed by method any2stringadd in scala.Predef.
    Definition Classes
    StringAdd
  5. def ->[B](y: B): (FlowOps[Out, Mat], B)

    Implicit information
    This member is added by an implicit conversion from FlowOps[Out, Mat] to ArrowAssoc[FlowOps[Out, Mat]] performed by method any2ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  6. final def ==(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  7. final def ==(arg0: Any): Boolean

    Definition Classes
    Any
  8. final def asInstanceOf[T0]: T0

    Definition Classes
    Any
  9. def buffer(size: Int, overflowStrategy: OverflowStrategy): Repr[Out, Mat]

    Adds a fixed size buffer in the flow that allows to store elements from a faster upstream until it becomes full.

    Adds a fixed size buffer in the flow that allows to store elements from a faster upstream until it becomes full. Depending on the defined akka.stream.OverflowStrategy it might drop elements or backpressure the upstream if there is no space available

    Emits when downstream stops backpressuring and there is a pending element in the buffer

    Backpressures when depending on OverflowStrategy * Backpressure - backpressures when buffer is full * DropHead, DropTail, DropBuffer - never backpressures * Fail - fails the stream if buffer gets full

    Completes when upstream completes and buffered elements has been drained

    Cancels when downstream cancels

    size

    The size of the buffer in element count

    overflowStrategy

    Strategy that is used when incoming elements cannot fit inside the buffer

  10. def clone(): AnyRef

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  11. def collect[T](pf: PartialFunction[Out, T]): Repr[T, Mat]

    Transform this stream by applying the given partial function to each of the elements on which the function is defined as they pass through this processing step.

    Transform this stream by applying the given partial function to each of the elements on which the function is defined as they pass through this processing step. Non-matching elements are filtered out.

    Emits when the provided partial function is defined for the element

    Backpressures when the partial function is defined for the element and downstream backpressures

    Completes when upstream completes

    Cancels when downstream cancels

  12. def conflate[S](seed: (Out) ⇒ S)(aggregate: (S, Out) ⇒ S): Repr[S, Mat]

    Allows a faster upstream to progress independently of a slower subscriber by conflating elements into a summary until the subscriber is ready to accept them.

    Allows a faster upstream to progress independently of a slower subscriber by conflating elements into a summary until the subscriber is ready to accept them. For example a conflate step might average incoming numbers if the upstream publisher is faster.

    This element only rolls up elements if the upstream is faster, but if the downstream is faster it will not duplicate elements.

    Emits when downstream stops backpressuring and there is a conflated element available

    Backpressures when never

    Completes when upstream completes

    Cancels when downstream cancels

    seed

    Provides the first state for a conflated value using the first unconsumed element as a start

    aggregate

    Takes the currently aggregated value and the current pending element to produce a new aggregate

  13. def drop(n: Long): Repr[Out, Mat]

    Discard the given number of elements at the beginning of the stream.

    Discard the given number of elements at the beginning of the stream. No elements will be dropped if n is zero or negative.

    Emits when the specified number of elements has been dropped already

    Backpressures when the specified number of elements has been dropped and downstream backpressures

    Completes when upstream completes

    Cancels when downstream cancels

  14. def dropWhile(p: (Out) ⇒ Boolean): Repr[Out, Mat]

    Discard elements at the beginning of the stream while predicate is true.

    Discard elements at the beginning of the stream while predicate is true. All elements will be taken after predicate returns false first time.

    Emits when predicate returned false and for all following stream elements

    Backpressures when predicate returned false and downstream backpressures

    Completes when upstream completes

    Cancels when downstream cancels

  15. def dropWithin(d: FiniteDuration): Repr.Repr[Out, Mat]

    Discard the elements received within the given duration at beginning of the stream.

    Discard the elements received within the given duration at beginning of the stream.

    Emits when the specified time elapsed and a new upstream element arrives

    Backpressures when downstream backpressures

    Completes when upstream completes

    Cancels when downstream cancels

  16. def ensuring(cond: (FlowOps[Out, Mat]) ⇒ Boolean, msg: ⇒ Any): FlowOps[Out, Mat]

    Implicit information
    This member is added by an implicit conversion from FlowOps[Out, Mat] to Ensuring[FlowOps[Out, Mat]] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  17. def ensuring(cond: (FlowOps[Out, Mat]) ⇒ Boolean): FlowOps[Out, Mat]

    Implicit information
    This member is added by an implicit conversion from FlowOps[Out, Mat] to Ensuring[FlowOps[Out, Mat]] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  18. def ensuring(cond: Boolean, msg: ⇒ Any): FlowOps[Out, Mat]

    Implicit information
    This member is added by an implicit conversion from FlowOps[Out, Mat] to Ensuring[FlowOps[Out, Mat]] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  19. def ensuring(cond: Boolean): FlowOps[Out, Mat]

    Implicit information
    This member is added by an implicit conversion from FlowOps[Out, Mat] to Ensuring[FlowOps[Out, Mat]] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  20. final def eq(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  21. def equals(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any
  22. def expand[S, U](seed: (Out) ⇒ S)(extrapolate: (S) ⇒ (U, S)): Repr[U, Mat]

    Allows a faster downstream to progress independently of a slower publisher by extrapolating elements from an older element until new element comes from the upstream.

    Allows a faster downstream to progress independently of a slower publisher by extrapolating elements from an older element until new element comes from the upstream. For example an expand step might repeat the last element for the subscriber until it receives an update from upstream.

    This element will never "drop" upstream elements as all elements go through at least one extrapolation step. This means that if the upstream is actually faster than the upstream it will be backpressured by the downstream subscriber.

    Expand does not support akka.stream.Supervision.Restart and akka.stream.Supervision.Resume. Exceptions from the seed or extrapolate functions will complete the stream with failure.

    Emits when downstream stops backpressuring

    Backpressures when downstream backpressures

    Completes when upstream completes

    Cancels when downstream cancels

    seed

    Provides the first state for extrapolation using the first unconsumed element

    extrapolate

    Takes the current extrapolation state to produce an output element and the next extrapolation state.

  23. def filter(p: (Out) ⇒ Boolean): Repr[Out, Mat]

    Only pass on those elements that satisfy the given predicate.

    Only pass on those elements that satisfy the given predicate.

    Emits when the given predicate returns true for the element

    Backpressures when the given predicate returns true for the element and downstream backpressures

    Completes when upstream completes

    Cancels when downstream cancels

  24. def finalize(): Unit

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  25. def flatten[U](strategy: FlattenStrategy[Out, U]): Repr[U, Mat]

    Transforms a stream of streams into a contiguous stream of elements using the provided flattening strategy.

    Transforms a stream of streams into a contiguous stream of elements using the provided flattening strategy. This operation can be used on a stream of element type akka.stream.scaladsl.Source.

    Emits when (Concat) the current consumed substream has an element available

    Backpressures when downstream backpressures

    Completes when upstream completes and all consumed substreams complete

    Cancels when downstream cancels

  26. def fold[T](zero: T)(f: (T, Out) ⇒ T): Repr[T, Mat]

    Similar to scan but only emits its result when the upstream completes, after which it also completes.

    Similar to scan but only emits its result when the upstream completes, after which it also completes. Applies the given function towards its current and next value, yielding the next current value.

    If the function f throws an exception and the supervision decision is akka.stream.Supervision.Restart current value starts at zero again the stream will continue.

    Emits when upstream completes

    Backpressures when downstream backpressures

    Completes when upstream completes

    Cancels when downstream cancels

  27. def formatted(fmtstr: String): String

    Implicit information
    This member is added by an implicit conversion from FlowOps[Out, Mat] to StringFormat performed by method any2stringfmt in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  28. final def getClass(): Class[_]

    Definition Classes
    AnyRef → Any
  29. def groupBy[K, U >: Out](f: (Out) ⇒ K): Repr[(K, Source[U, Unit]), Mat]

    This operation demultiplexes the incoming stream into separate output streams, one for each element key.

    This operation demultiplexes the incoming stream into separate output streams, one for each element key. The key is computed for each element using the given function. When a new key is encountered for the first time it is emitted to the downstream subscriber together with a fresh flow that will eventually produce all the elements of the substream for that key. Not consuming the elements from the created streams will stop this processor from processing more elements, therefore you must take care to unblock (or cancel) all of the produced streams even if you want to consume only one of them.

    If the group by function f throws an exception and the supervision decision is akka.stream.Supervision.Stop the stream and substreams will be completed with failure.

    If the group by function f throws an exception and the supervision decision is akka.stream.Supervision.Resume or akka.stream.Supervision.Restart the element is dropped and the stream and substreams continue.

    Emits when an element for which the grouping function returns a group that has not yet been created. Emits the new group

    Backpressures when there is an element pending for a group whose substream backpressures

    Completes when upstream completes

    Cancels when downstream cancels and all substreams cancel

  30. def grouped(n: Int): Repr[Seq[Out], Mat]

    Chunk up this stream into groups of the given size, with the last group possibly smaller than requested due to end-of-stream.

    Chunk up this stream into groups of the given size, with the last group possibly smaller than requested due to end-of-stream.

    n must be positive, otherwise IllegalArgumentException is thrown.

    Emits when the specified number of elements has been accumulated or upstream completed

    Backpressures when a group has been assembled and downstream backpressures

    Completes when upstream completes

    Cancels when downstream cancels

  31. def groupedWithin(n: Int, d: FiniteDuration): Repr.Repr[Seq[Out], Mat]

    Chunk up this stream into groups of elements received within a time window, or limited by the given number of elements, whatever happens first.

    Chunk up this stream into groups of elements received within a time window, or limited by the given number of elements, whatever happens first. Empty groups will not be emitted if no elements are received from upstream. The last group before end-of-stream will contain the buffered elements since the previously emitted group.

    n must be positive, and d must be greater than 0 seconds, otherwise IllegalArgumentException is thrown.

    Emits when the configured time elapses since the last group has been emitted

    Backpressures when the configured time elapses since the last group has been emitted

    Completes when upstream completes (emits last group)

    Cancels when downstream completes

  32. def hashCode(): Int

    Definition Classes
    AnyRef → Any
  33. final def isInstanceOf[T0]: Boolean

    Definition Classes
    Any
  34. def log(name: String, extract: (Out) ⇒ Any = _identity)(implicit log: LoggingAdapter = null): Repr[Out, Mat]

    Logs elements flowing through the stream as well as completion and erroring.

    Logs elements flowing through the stream as well as completion and erroring.

    By default element and completion signals are logged on debug level, and errors are logged on Error level. This can be adjusted according to your needs by providing a custom Attributes.LogLevels atrribute on the given Flow:

    Uses implicit LoggingAdapter if available, otherwise uses an internally created one, which uses akka.stream.Log as it's source (use this class to configure slf4j loggers).

    Emits when the mapping function returns an element

    Backpressures when downstream backpressures

    Completes when upstream completes

    Cancels when downstream cancels

  35. def map[T](f: (Out) ⇒ T): Repr[T, Mat]

    Transform this stream by applying the given function to each of the elements as they pass through this processing step.

    Transform this stream by applying the given function to each of the elements as they pass through this processing step.

    Emits when the mapping function returns an element

    Backpressures when downstream backpressures

    Completes when upstream completes

    Cancels when downstream cancels

  36. def mapAsync[T](parallelism: Int)(f: (Out) ⇒ Future[T]): Repr[T, Mat]

    Transform this stream by applying the given function to each of the elements as they pass through this processing step.

    Transform this stream by applying the given function to each of the elements as they pass through this processing step. The function returns a Future and the value of that future will be emitted downstream. The number of Futures that shall run in parallel is given as the first argument to mapAsync. These Futures may complete in any order, but the elements that are emitted downstream are in the same order as received from upstream.

    If the group by function f throws an exception or if the Future is completed with failure and the supervision decision is akka.stream.Supervision.Stop the stream will be completed with failure.

    If the group by function f throws an exception or if the Future is completed with failure and the supervision decision is akka.stream.Supervision.Resume or akka.stream.Supervision.Restart the element is dropped and the stream continues.

    Emits when the Future returned by the provided function finishes for the next element in sequence

    Backpressures when the number of futures reaches the configured parallelism and the downstream backpressures or the first future is not completed

    Completes when upstream completes and all futures has been completed and all elements has been emitted

    Cancels when downstream cancels

    See also

    #mapAsyncUnordered

  37. def mapAsyncUnordered[T](parallelism: Int)(f: (Out) ⇒ Future[T]): Repr[T, Mat]

    Transform this stream by applying the given function to each of the elements as they pass through this processing step.

    Transform this stream by applying the given function to each of the elements as they pass through this processing step. The function returns a Future and the value of that future will be emitted downstreams. As many futures as requested elements by downstream may run in parallel and each processed element will be emitted dowstream as soon as it is ready, i.e. it is possible that the elements are not emitted downstream in the same order as received from upstream.

    If the group by function f throws an exception or if the Future is completed with failure and the supervision decision is akka.stream.Supervision.Stop the stream will be completed with failure.

    If the group by function f throws an exception or if the Future is completed with failure and the supervision decision is akka.stream.Supervision.Resume or akka.stream.Supervision.Restart the element is dropped and the stream continues.

    Emits when any of the Futures returned by the provided function complete

    Backpressures when the number of futures reaches the configured parallelism and the downstream backpressures

    Completes when upstream completes and all futures has been completed and all elements has been emitted

    Cancels when downstream cancels

    See also

    #mapAsync

  38. def mapConcat[T](f: (Out) ⇒ Iterable[T]): Repr[T, Mat]

    Transform each input element into an Iterable of output elements that is then flattened into the output stream.

    Transform each input element into an Iterable of output elements that is then flattened into the output stream.

    The returned Iterable 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

  39. final def ne(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  40. final def notify(): Unit

    Definition Classes
    AnyRef
  41. final def notifyAll(): Unit

    Definition Classes
    AnyRef
  42. def prefixAndTail[U >: Out](n: Int): Repr[(Seq[Out], Source[U, Unit]), Mat]

    Takes up to n elements from the stream (less than n only if the upstream completes before emitting n elements) and returns a pair containing a strict sequence of the taken element and a stream representing the remaining elements.

    Takes up to n elements from the stream (less than n only if the upstream completes before emitting n elements) and returns a pair containing a strict sequence of the taken element and a stream representing the remaining elements. If n is zero or negative, then this will return a pair of an empty collection and a stream containing the whole upstream unchanged.

    In case of an upstream error, depending on the current state

    • the master stream signals the error if less than n elements has been seen, and therefore the substream has not yet been emitted
    • the tail substream signals the error after the prefix and tail has been emitted by the main stream (at that point the main stream has already completed)

    Emits when the configured number of prefix elements are available. Emits this prefix, and the rest as a substream

    Backpressures when downstream backpressures or substream backpressures

    Completes when prefix elements has been consumed and substream has been consumed

    Cancels when downstream cancels or substream cancels

  43. def recover[T >: Out](pf: PartialFunction[Throwable, T]): Repr[T, Mat]

    Recover allows to send last element on failure and gracefully complete the stream Since the underlying failure signal onError arrives out-of-band, it might jump over existing elements.

    Recover allows to send last element on failure and gracefully complete the stream Since the underlying failure signal onError arrives out-of-band, it might jump over existing elements. This stage can recover the failure signal, but not the skipped elements, which will be dropped.

    Emits when element is available from the upstream or upstream is failed and pf returns an element

    Backpressures when downstream backpressures

    Completes when upstream completes or upstream failed with exception pf can handle

    Cancels when downstream cancels

  44. def scan[T](zero: T)(f: (T, Out) ⇒ T): Repr[T, Mat]

    Similar to fold but is not a terminal operation, emits its current value which starts at zero and then applies the current and next value to the given function f, emitting the next current value.

    Similar to fold but is not a terminal operation, emits its current value which starts at zero and then applies the current and next value to the given function f, emitting the next current value.

    If the function f throws an exception and the supervision decision is akka.stream.Supervision.Restart current value starts at zero again the stream will continue.

    Emits when the function scanning the element returns a new element

    Backpressures when downstream backpressures

    Completes when upstream completes

    Cancels when downstream cancels

  45. def splitAfter[U >: Out](p: (Out) ⇒ Boolean): Repr.Repr[Source[U, Unit], Mat]

    This operation applies the given predicate to all incoming elements and emits them to a stream of output streams.

    This operation applies the given predicate to all incoming elements and emits them to a stream of output streams. It *ends* the current substream when the predicate is true. This means that for the following series of predicate values, three substreams will be produced with lengths 2, 2, and 3:

    false, true,        // elements go into first substream
    false, true,        // elements go into second substream
    false, false, true  // elements go into third substream

    If the split predicate p throws an exception and the supervision decision is akka.stream.Supervision.Stop the stream and substreams will be completed with failure.

    If the split predicate p throws an exception and the supervision decision is akka.stream.Supervision.Resume or akka.stream.Supervision.Restart the element is dropped and the stream and substreams continue.

    Emits when an element passes through. When the provided predicate is true it emitts the element and opens a new substream for subsequent element

    Backpressures when there is an element pending for the next substream, but the previous is not fully consumed yet, or the substream backpressures

    Completes when upstream completes

    Cancels when downstream cancels and substreams cancel

    See also FlowOps.splitAfter.

  46. def splitWhen[U >: Out](p: (Out) ⇒ Boolean): Repr.Repr[Source[U, Unit], Mat]

    This operation applies the given predicate to all incoming elements and emits them to a stream of output streams, always beginning a new one with the current element if the given predicate returns true for it.

    This operation applies the given predicate to all incoming elements and emits them to a stream of output streams, always beginning a new one with the current element if the given predicate returns true for it. This means that for the following series of predicate values, three substreams will be produced with lengths 1, 2, and 3:

    false,             // element goes into first substream
    true, false,       // elements go into second substream
    true, false, false // elements go into third substream

    In case the *first* element of the stream matches the predicate, the first substream emitted by splitWhen will start from that element. For example:

    true, false, false // first substream starts from the split-by element
    true, false        // subsequent substreams operate the same way

    If the split predicate p throws an exception and the supervision decision is akka.stream.Supervision.Stop the stream and substreams will be completed with failure.

    If the split predicate p throws an exception and the supervision decision is akka.stream.Supervision.Resume or akka.stream.Supervision.Restart the element is dropped and the stream and substreams continue.

    Emits when an element for which the provided predicate is true, opening and emitting a new substream for subsequent element

    Backpressures when there is an element pending for the next substream, but the previous is not fully consumed yet, or the substream backpressures

    Completes when upstream completes

    Cancels when downstream cancels and substreams cancel

  47. final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
    AnyRef
  48. def take(n: Long): Repr[Out, Mat]

    Terminate processing (and cancel the upstream publisher) after the given number of elements.

    Terminate processing (and cancel the upstream publisher) after the given number of elements. Due to input buffering some elements may have been requested from upstream publishers that will then not be processed downstream of this step.

    The stream will be completed without producing any elements if n is zero or negative.

    Emits when the specified number of elements to take has not yet been reached

    Backpressures when downstream backpressures

    Completes when the defined number of elements has been taken or upstream completes

    Cancels when the defined number of elements has been taken or downstream cancels

  49. def takeWhile(p: (Out) ⇒ Boolean): Repr[Out, Mat]

    Terminate processing (and cancel the upstream publisher) after predicate returns false for the first time.

    Terminate processing (and cancel the upstream publisher) after predicate returns false for the first time. Due to input buffering some elements may have been requested from upstream publishers that will then not be processed downstream of this step.

    The stream will be completed without producing any elements if predicate is false for the first stream element.

    Emits when the predicate is true

    Backpressures when downstream backpressures

    Completes when predicate returned false or upstream completes

    Cancels when predicate returned false or downstream cancels

  50. def takeWithin(d: FiniteDuration): Repr.Repr[Out, Mat]

    Terminate processing (and cancel the upstream publisher) after the given duration.

    Terminate processing (and cancel the upstream publisher) after the given duration. Due to input buffering some elements may have been requested from upstream publishers that will then not be processed downstream of this step.

    Note that this can be combined with #take to limit the number of elements within the duration.

    Emits when an upstream element arrives

    Backpressures when downstream backpressures

    Completes when upstream completes or timer fires

    Cancels when downstream cancels or timer fires

  51. def toString(): String

    Definition Classes
    AnyRef → Any
  52. def transform[T](mkStage: () ⇒ Stage[Out, T]): Repr[T, Mat]

    Generic transformation of a stream with a custom processing akka.stream.stage.Stage.

    Generic transformation of a stream with a custom processing akka.stream.stage.Stage. This operator makes it possible to extend the Flow API when there is no specialized operator that performs the transformation.

  53. final def wait(): Unit

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    @throws( ... )
  54. final def wait(arg0: Long, arg1: Int): Unit

    Definition Classes
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    @throws( ... )
  55. final def wait(arg0: Long): Unit

    Definition Classes
    AnyRef
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    @throws( ... )
  56. def [B](y: B): (FlowOps[Out, Mat], B)

    Implicit information
    This member is added by an implicit conversion from FlowOps[Out, Mat] to ArrowAssoc[FlowOps[Out, Mat]] performed by method any2ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

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  1. val self: Any

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Deprecated Value Members

  1. def x: FlowOps[Out, Mat]

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    (Since version 2.10.0) Use leftOfArrow instead

  2. def x: FlowOps[Out, Mat]

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    This member is added by an implicit conversion from FlowOps[Out, Mat] to Ensuring[FlowOps[Out, Mat]] performed by method any2Ensuring in scala.Predef.
    Shadowing
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    (Since version 2.10.0) Use resultOfEnsuring instead

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion any2stringadd from FlowOps[Out, Mat] to StringAdd

Inherited by implicit conversion any2stringfmt from FlowOps[Out, Mat] to StringFormat

Inherited by implicit conversion any2ArrowAssoc from FlowOps[Out, Mat] to ArrowAssoc[FlowOps[Out, Mat]]

Inherited by implicit conversion any2Ensuring from FlowOps[Out, Mat] to Ensuring[FlowOps[Out, Mat]]

Ungrouped