Struct DetectDispatcher 

pub struct DetectDispatcher { /* private fields */ }

Implements a dispatcher that is either set at construction or detected and cached on first use.

This is intended to be used inside futures to implement detecting the current dispatcher on first poll if the instigator of the future did not specify a dispatcher to run on.

Implementations

impl DetectDispatcher

pub fn new(with_dispatcher: impl AsAsyncDispatcherRef) -> Self

Use this to pre-set the dispatcher so that future calls to GetAsyncDispatcher will return is dispatcher instead of trying to get the default one.

pub fn get_or_detect(&self) -> Result<&AsyncDispatcher, Status>

Gets the dispatcher if set in the constructor, or attempts to retrieve the current dispatcher as set by crate::CurrentDispatcher::set (or the underlying async-default api).

Use this in a std::task::Poll implementation to defer finding the current dispatcher until the future is being run on the dispatcher.

Once a dispatcher has been set or detected, that dispatcher will be held and returned for all future calls.

Returns Status::BAD_STATE if there is no dispatcher set or detected.

pub fn get(&self) -> Option<&AsyncDispatcher>

Gets the dispatcher if it had been previously set or detected. If it hasn’t, this will return None.

Trait Implementations

impl Debug for DetectDispatcher

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

Formats the value using the given formatter.

impl Default for DetectDispatcher

fn default() -> DetectDispatcher

Returns the “default value” for a type.