Is there a way to use select (or some other similar mechanism) to select for messages on an arbitrar...

# coroutines

[Matt Thiffault]

Is there a way to use select (or some other similar mechanism) to select for messages on an arbitrary set of Channels not known at compile time (provided the channels have the same message type)?

[octylFractal]

what's wrong with using select?

[octylFractal]

you can just do for (c in list) c.onX {}

[Matt Thiffault]

Ah, I hadn't found any docs which did something like that, wasn't sure if calling onReceive in a loop in a select block would do what I want

[Matt Thiffault]

If it will, awesome

[Matt Thiffault]

It looked like you had to explicitly do
select<Type> {
foo.onReceive...
bar.onReceive...
baz.onReceive...
....

[octylFractal]

there's no magic language feature, it's just library code , so I presume it will work because it's just like listing individually

[bdawg.io]

The following works as well

val receivingA: SelectClause1<Foo> = channel.onReceive
select { // this: SelectBuilder<Foo>
    receivingA { it }
}

The key thing is that you invoke on the SelectClause returned by the onReceive property from inside of the SelectBuilder context

[bdawg.io]

These invoke extension methods are found here in source: https://github.com/Kotlin/kotlinx.coroutines/blob/master/kotlinx-coroutines-core/common/src/selects/Select.kt#L20-L52