Declaring defaults for generic type parameters - i...

# language-proposals

[gregd]

Declaring defaults for generic type parameters - it’s a nice little feature I miss in Kotlin, e.g.:

interface Foo<T, U = Unit, V = Unit>

or even:

interface Foo<T, U = Unit, V = T>

This way, if you don’t care about some parameters, you could write:

class Bar : Foo<Int>

instead of:

class Bar : Foo<Int, Unit, Unit>

So far I’ve seen it in C++ and TypeScript, and it seems to work well.

What do You think?

[gildor]

Someone already asked about this feature. As I remember JB guys said that have that in plans

[gildor]

https://kotlinlang.slackarchive.io/language-proposals/page-65/ts-1508774988000003

[snrostov]

Is there issue in youtrack to vote and track it?

[gildor]

I don’t know such issue, maybe make sense to create it

[gregd]

I’ve searched for the issue on YT, but didn’t find one

[gregd]

Shall I create one @dmitry.petrov? Or is it not necessary, since you’re already working on it?

[gildor]

I think so, In the worst case issue will be marked as a duplicate

[gregd]

Yeah. Maybe Dmitry can tell some more details

[gregd]

@gildor Thanks for pointing me to the right place 😉

[kirillrakhman]

https://youtrack.jetbrains.com/issue/KT-17061

[snrostov]

also https://youtrack.jetbrains.com/issue/KT-1215

[alex.krupa]

If I remember correctly, one of JB guys wrote here that it’s planned for 1.3. Can’t find it in the channel’s history, which is apparently a paid feature now.

[snrostov]

In this thread Andrey Mischenko post link to archive [1 day ago]:

https://kotlinlang.slackarchive.io/language-proposals/page-65/ts-1508774988000003