Struct Discard 

pub struct Discard<F>(pub F);

Adapts a future that resolves to something into one that resolves to (), for use as a Timer::Sleep.

This is not redundant, and it is not a mistake. Two of this project’s clocks have a native timer whose Output is not (): async_io::Timer resolves to the std::time::Instant at which it fired, and hclient-fetch’s SendJsFuture resolves to Result<JsValue, JsValue>. While Timer::sleep was an RPITIT both were discarded invisibly inside an async block; with a named associated type the discard has to be written down, and this is where it is written down once instead of twice.

F: Unpin rather than a pin projection: every timer this wraps is Unpin already, and this workspace forbids unsafe, so the safe projection is the only one available and the bound is honest about it.

Tuple Fields

0: F

Trait Implementations

impl<F: Clone> Clone for Discard<F>

fn clone(&self) -> Discard<F>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<F: Copy> Copy for Discard<F>

impl<F: Debug> Debug for Discard<F>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<F: Future + Unpin> Future for Discard<F>

type Output = ()

The type of value produced on completion.

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

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