Would be great, foo bar

# announcements

[liminal]

Would be great, foo bar

[redrield]

liminal: basically, in and out tell the compiler whether your function or class produces a generic, or consumes it

[redrield]

If you have this: fun <T> hello(): T { }, you'll be told that T can be marked out

[redrield]

Because hello() doesn't consume, or have any parameters of type T

[redrield]

It just produces an instance of T

[redrield]

Flip side, fun <T> hello(thing: T): String { }, you'll be told T can be marked in

[redrield]

You consume, or take a parameter of type T

[redrield]

And don't produce it

[redrield]

Something in the middle wouldn't need variance at all, because it produces and consumes

[redrield]

fun <T> hello(inst: T): T { } is an example of that

[liminal]

I see. Thanks!

[tapchicoma]

nice explanation, thanks!

[azabost]

@redrield Could you please also explain what do you gain by marking the variance? Is it important for some reason?