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Akka.NETSourceOperations.Sum<TOut, TMat> Method
Similar to Aggregate< TOut1, TOut2, TMat> (Source< TOut1, TMat> , TOut2, Func< TOut2, TOut1, TOut2> ) but uses first element as zero element. Applies the given function reduce towards its current and next value, yielding the next current value. If the stream is empty (i.e. completes before signaling any elements), the sum stage will fail its downstream with a NoSuchElementException, which is semantically in-line with that standard library collections do in such situations.

Emits when upstream completes

Backpressures when downstream backpressures

Completes when upstream completes

Cancels when downstream cancels

Namespace:  Akka.Streams.Dsl
Assembly:  Akka.Streams (in Akka.Streams.dll) Version: 1.2.3.42 (1.2.3.42)
Syntax
public static Source<TOut, TMat> Sum<TOut, TMat>(
	this Source<TOut, TMat> flow,
	Func<TOut, TOut, TOut> reduce
)

Parameters

flow
Type: Akka.Streams.Dsl.Source<TOut, TMat>
TBD
reduce
Type: System.Func<TOut, TOut, TOut>
TBD

Type Parameters

TOut
TBD
TMat
TBD

Return Value

Type: Source<TOut, TMat>
TBD

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type Source<TOut, TMat>. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
See Also