How do I implement two way generator with kotlin coroutines kotlinlang #coroutines

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Title

l

Luis Munoz

05/19/2020, 8:42 PM

How do I implement two way generator with kotlin coroutines? For example in javascript you would do:

function* generatorFunction(i) {
   yield i
   yield i +1
}

let gen = generator(5)
gen.next() //  value=5, done=false
gen.next() //  value=6, done=false
// WHAT I WANT IS THIS
gen.next(100) // <-- here I pass value and get back another value at next yield point

so in generator it would be let x = yield i to get the input value

o

octylFractal

05/19/2020, 8:45 PM

https://github.com/Kotlin/coroutines-examples/blob/master/examples/generator/generator.kt

l

Luis Munoz

05/19/2020, 8:48 PM

thank you

generate<String, ByteBuffer> { val result = parse() // ERROR // Doesn't let me call suspend function something about // @RestrictsSuspension yield(result) }

@octylFractal do you how I can call other suspend functions inside the generate?

o

octylFractal

05/19/2020, 9:42 PM

yes, this is restricted like a

sequence

because there's no scope

l

Luis Munoz

05/19/2020, 9:43 PM

so I can't call another suspend function?

o

octylFractal

05/19/2020, 9:43 PM

I don't really have a fix for it, you'd have to introduce something more Flow-like

l

Luis Munoz

05/19/2020, 9:43 PM

or can I extend

a

araqnid

05/19/2020, 9:44 PM

you can call another suspend function only if it is defined as an extension of GeneratorBuilder — i.e. that will only suspend on

yield

l

Luis Munoz

05/19/2020, 9:51 PM

changing methods to suspend fun GeneratorBuilder<String, ByteBuffer>.parse() seems to work, thanks @araqnid

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