`var authState by state AuthState ` complaint about `Functio

Question

`var authState by state AuthState ` complaint about `Functions which invoke Composable functions must be marked with the Composable annotation` what should i do

Zach Klippenstein (he/him) [MOD] · Answer

Can you post a larger code snippet for context

codeslubber · Answer

Sounds like maybe they added an error message that was not there before Is AuthState composable

camkadev · Answer

AuthState is my model class ``` Model class AuthState var login String = var password String = var token String = ```

codeslubber · Answer

I thought state and model were either ors

Zach Klippenstein (he/him) [MOD] · Answer

You usually use `remember` with ` Model` classes because you want to keep the same instance of the model `state` is for when you want to change the reference itself but it should still compile Can you post the code around `var authState by state AuthState `

Leland Richardson [G] · Answer

if AuthState is a model you very likely do not want state there That said I am fairly sure that this is unrelated to the error that you re getting

Leland Richardson [G] · Answer

are you trying to use `state` outside of a composable function

camkadev · Answer

< Zach Klippenstein he him MOD > it s just a var s placed outside of any class < Leland Richardson G > i use authState inside Composable methods

Zach Klippenstein (he/him) [MOD] · Answer

Ah if you re trying to call `state` for a top level var that s the problem `state` is a composable function it can only be called from inside another composable function just like the error says

Zach Klippenstein (he/him) [MOD] · Answer

``` Not allowed var foo by state foo Composable fun Bar Allowed var bar by state bar ```

camkadev · Answer

i migrated from dev05 to dev09 where that was works

Zach Klippenstein (he/him) [MOD] · Answer

Huh I don t even know what `state` at a top level would me or how that would work Curious what Leland has to say sweat smile

camkadev · Answer

i replaced `by state` with `= mutableStateOf ` and looks like that works but any way found compilation error <https issuetracker google com issues 154867792>

Zach Klippenstein (he/him) [MOD] · Answer

`mutableStateOf` isn t a composable function so it should be callable from anywhere

Zach Klippenstein (he/him) [MOD] · Answer

The difference is in who owns the `State` instance if you call `mutableStateOf` from the top level it s a global variable and owned by the process and will never be GC d If you use `state` or `remember mutableStateOf ` which is how `state` works under the hood the instance is owned by the composable at that point in the composition tree and will be GC d if that composable ever leaves the composition

camkadev · Answer

ok thanks for explanation

Leland Richardson [G] · Answer

yep `state` is just shorthand for `remember mutableStateOf block `