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Semicoroutines

The simplest F# semicoroutines via seq. comprehensions http://en.wikipedia.org/wiki/Coroutine Replaced a custom function with the pipeline operator.

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open System
let randGen = new Random()

let producer = 
    Seq.initInfinite (fun _ -> randGen.Next())

let consumer =
    Seq.initInfinite (fun _ -> (printfn "got %i"))
    
let combine producer consumer = 
    Seq.map2 (|>) producer consumer
    
combine producer consumer |> Seq.take 100 |> Seq.toArray |> ignore

namespace System

val randGen : Random

Full name: Script.randGen

Multiple items
type Random =
  new : unit -> Random + 1 overload
  member Next : unit -> int + 2 overloads
  member NextBytes : buffer:byte[] -> unit
  member NextDouble : unit -> float

Full name: System.Random

--------------------
Random() : unit
Random(Seed: int) : unit

val producer : seq<int>

Full name: Script.producer

module Seq

from Microsoft.FSharp.Collections

val initInfinite : initializer:(int -> 'T) -> seq<'T>

Full name: Microsoft.FSharp.Collections.Seq.initInfinite

Random.Next() : int
Random.Next(maxValue: int) : int
Random.Next(minValue: int, maxValue: int) : int

val consumer : seq<(int -> unit)>

Full name: Script.consumer

val printfn : format:Printf.TextWriterFormat<'T> -> 'T

Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.printfn

val combine : producer:seq<'a> -> consumer:seq<('a -> 'b)> -> seq<'b>

Full name: Script.combine

val producer : seq<'a>

val consumer : seq<('a -> 'b)>

val map2 : mapping:('T1 -> 'T2 -> 'U) -> source1:seq<'T1> -> source2:seq<'T2> -> seq<'U>

Full name: Microsoft.FSharp.Collections.Seq.map2

val take : count:int -> source:seq<'T> -> seq<'T>

Full name: Microsoft.FSharp.Collections.Seq.take

val toArray : source:seq<'T> -> 'T []

Full name: Microsoft.FSharp.Collections.Seq.toArray

val ignore : value:'T -> unit

Full name: Microsoft.FSharp.Core.Operators.ignore

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More information

Link:	http://fssnip.net/iX
Posted:	11 years ago
Author:	Lakret
Tags:	semicoroutines , coroutines