future_form 0.3.1

Abstractions over Send and !Send futures
Documentation 
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use super::*;

trait Callback<K: FutureForm> {
    fn call<'a>(&'a self, f: K::Future<'a, u32>) -> K::Future<'a, u32>;
}

struct Passthrough<K>(PhantomData<K>);

#[future_form(Sendable, Local)]
impl<K: FutureForm> Callback<K> for Passthrough<K> {
    fn call<'a>(&'a self, f: K::Future<'a, u32>) -> K::Future<'a, u32> {
        f
    }
}

#[tokio::test]
async fn test_k_in_method_param_sendable() {
    let p: Passthrough<Sendable> = Passthrough(PhantomData);
    let fut = Sendable::from_future(async { 42 });
    let result = <Passthrough<Sendable> as Callback<Sendable>>::call(&p, fut).await;
    assert_eq!(result, 42);
}

#[tokio::test]
async fn test_k_in_method_param_local() {
    let p: Passthrough<Local> = Passthrough(PhantomData);
    let fut = Local::from_future(async { 42 });
    let result = <Passthrough<Local> as Callback<Local>>::call(&p, fut).await;
    assert_eq!(result, 42);
}