Enum TrySync 

pub enum TrySync<F: Future> {
    Sync(F::Output),
    Async(F),
    SyncPolled,
}

An async wrapper with an optimized synchronous execution path.

It is used in combination with Future trait objects, such as DynObject<dyn Future<Output=T>>.

Examples

trait Callback {
    fn call(&self, arg: &str) -> TrySync<DynObject<dyn Future<Output = ()>>>;
}

struct Print;
impl Callback for Print {
    fn call(&self, arg: &str) -> TrySync<DynObject<dyn Future<Output = ()>>> {
        println!("{arg}");
        TrySync::Sync(())
    }
}

Variants

Sync(F::Output)

Optimized synchronous execution path.

Async(F)

Asynchronous wrapper

SyncPolled

Synchronous execution path already polled

Trait Implementations

impl<F: Future> Future for TrySync<F>

type Output = <F as Future>::Output

The type of value produced on completion.

fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>

Attempts to resolve the future to a final value, registering the current task for wakeup if the value is not yet available.