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stages-pages/h8io.stages/Yield/None

None

h8io.stages.Yield.None
final case class None[-I, +O, +E](status: Status[E], evolution: Evolution[I, O, E]) extends Yield[I, O, E]

A yield carrying no output — a filter dropping an input, a stage with nothing to report yet. The status and the evolution are still there, so the pipeline continues as usual.

Type parameters

E

the error type (covariant)

I

the input type of the stages held by the evolution (contravariant)

O

the output type never produced here (covariant)

Value parameters

evolution

the continuation

status

the status of the run that produced this yield

Attributes

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Supertypes
trait Serializable
trait Product
trait Equals
trait Yield[I, O, E]
class Object
trait Matchable
class Any
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Members list

Value members

Concrete methods

override def map[_I, _O, _E](mapOut: O => _O, mapStatus: Status[E] => Status[_E], mapEvolution: Evolution[I, O, E] => Evolution[_I, _O, _E]): Yield[_I, _O, _E]

Transforms all three components at once. mapOut is not called on a Yield.None, which has no output to transform, but is still required so that the result type is the same for both variants.

Transforms all three components at once. mapOut is not called on a Yield.None, which has no output to transform, but is still required so that the result type is the same for both variants.

Attributes

Definition Classes
override def outOption: Option[O]

The output as an Option — for when only its presence matters. Prefer matching on Yield.Some / Yield.None when the status or the evolution is needed too.

The output as an Option — for when only its presence matters. Prefer matching on Yield.Some / Yield.None when the status or the evolution is needed too.

Attributes

Definition Classes

Inherited methods

def evolve(): Stage[I, O, E]

The stage that handles the next input: the continuation this yield's own status selects.

The stage that handles the next input: the continuation this yield's own status selects.

Going through the evolution directly is the exception, not the rule — the status a yield carries is the one its continuation must be chosen by, and this method is what pairs them.

Attributes

Inherited from:
Yield
def productElementNames: Iterator[String]

An iterator over the names of all the elements of this product.

An iterator over the names of all the elements of this product.

Attributes

Inherited from:
Product
def productIterator: Iterator[Any]

An iterator over all the elements of this product.

An iterator over all the elements of this product.

Attributes

Returns

in the default implementation, an Iterator[Any]

Inherited from:
Product
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