Store Arc<Mutex<Box<dyn MyTrait>>> as StateData about gotham HOT 8 CLOSED

You need to require Send, for example, with trait MyTrait: Send {}

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Alternatively, you could also store Vec<Box<dyn MyTrait + Send>> if you don't want Send to be a supertrait of MyTrait.

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Wow!! thanks a lot for the quick answers!

And what if RequestCounter is a generc struct?

#[derive(Clone, StateData)] // <--- this line goes to error
struct RequestCounter<T> {
    inner: Arc<Mutex<T>>,
}

I tried to put T: Send but is not sufficient

the parameter type `T` may not live long enough
...so that the type `T` will meet its required lifetime boundsrustcE0310
main.rs(27, 24): consider adding an explicit lifetime bound...: `T: 'static + `

Why is the error suggesting me to consider + 'static ? I wouldn't like to that.

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StateData requires Any, which requires 'static. Sorry, I don't think there's any reasonable way around this requirement at the moment.

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Oki not a problem: I'll duplicate "RequestCounter" for every Service I need.

But why StateData needs to be Any?

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Can't you just put that requirement on the type parameter? Like

#[derive(Clone, StateData)]
struct RequestCounter<T: Send + 'static> {
    inner: Arc<Mutex<T>>
}

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If that doesn't work, you can still implement StateData manually:

struct RequestCounter<T>(Arc<Mutex<T>>);

impl<T> StateData for RequestCounter<T>
where
    T: Send + 'static
{}

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thanks for the help!

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