future<void>

[li-feng-sc]

Currently future<> type requires a non-void type, because void is not a valid Djinni type. This means the IDL cannot represent a future with no value, but only a completion status.

[bkotsopoulossc]

+1, this is quite awkward without

[li-feng-sc]

• The C++ Future can already support Future<void>
• Java has java.lang.Void that can be used to box a void value.
• What is ObjC's equivalent of java.lang.Void?
• Javascript Promise also already supports Promise<void>.

[bkotsopoulossc]

Seems like everything is easy except obj-c. I don't think they have a boxed version of void. Do you need a boxed type? Maybe NSValue or a void* or something? What are the constraints?

[paulocoutinhox]

Hi,

In obj-c you have type id: https://riptutorial.com/objective-c/example/16005/id

I don't know if it help.

The java.lang.Void can be integer? https://stackoverflow.com/questions/10839042/what-is-the-difference-between-java-lang-void-and-void

Thanks.

[nolanw]

For Objective-C, maybe NSNull?

[nmtitov]

NSNull is the only option for objc I guess since we can't put void in box

[bkotsopoulossc]

to get the full value of https://github.com/Snapchat/djinni/pull/116 we really need to get a void type, otherwise it's painful to interop coroutines that return void with djinni futures that can't