Struct Permit 

pub struct Permit<R, F>
where
    R: Send + 'static,
    F: Future<Output = R> + 'static,
{ /* private fields */ }

👎Deprecated since 0.1.4:

The Permit is going to be deprecated in favor of calling GateKeeper’s issue() method to guard the gate. This struct, along with the associated API (i.e. register()), will be removed in the 0.1.5 release.

Trait Implementations

impl<R, F> Future for Permit<R, F>

where R: Send + 'static, F: Future<Output = R> + 'static,

type Output = R

The type of value produced on completion.

fn poll(self: Pin<&mut Self>, ctx: &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.