Struct Optional
pub struct Optional<T> { /* private fields */ }Optionally forwards requests to an inner service.
If the inner service is None, optional::None is returned as the response.
Implementations
impl<T> Optional<T>
const fn new<Request>(inner: Option<T>) -> Optional<T> where T: Service<Request>, T::Error: Into<BoxError>,Create a new
Optional.
Trait Implementations
impl<T, Request> Service<Request> for Optional<T>
where
T: Service<Request>,
T::Error: Into<BoxError>,
type Response = <T as Service<Request>>::Response;type Error = Box<dyn Error + Sync + Send>;type Future = ResponseFuture<<T as Service<Request>>::Future>;fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>>fn call(&mut self, request: Request) -> Self::Future
impl<T: Debug> Debug for Optional<T>
fn fmt(&self, f: &mut Formatter<'_>) -> Result
Auto Trait Implementations
impl<T> Freeze for Optional<T>
where
Option<T>: Freeze,
impl<T> RefUnwindSafe for Optional<T>
where
Option<T>: RefUnwindSafe,
impl<T> Send for Optional<T>
where
Option<T>: Send,
impl<T> Sync for Optional<T>
where
Option<T>: Sync,
impl<T> Unpin for Optional<T>
where
Option<T>: Unpin,
impl<T> UnsafeUnpin for Optional<T>
where
Option<T>: UnsafeUnpin,
impl<T> UnwindSafe for Optional<T>
where
Option<T>: UnwindSafe,
Blanket Implementations
impl<C, Target> MakeConnection<Target> for Optional<T>
where
C: Service<Target>,
<C as Service<Target>>::Response: AsyncRead + AsyncWrite,
type Connection = <C as Service<Target>>::Response;type Error = <C as Service<Target>>::Error;type Future = <C as Service<Target>>::Future;fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), <C as MakeConnection<Target>>::Error>>fn make_connection(&mut self, target: Target) -> <C as MakeConnection<Target>>::Future
impl<M, S, Target, Request> MakeService<Target, Request> for Optional<T>
where
M: Service<Target, Response = S>,
S: Service<Request>,
type Response = <S as Service<Request>>::Response;type Error = <S as Service<Request>>::Error;type Service = S;type MakeError = <M as Service<Target>>::Error;type Future = <M as Service<Target>>::Future;fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), <M as MakeService<Target, Request>>::MakeError>>fn make_service(&mut self, target: Target) -> <M as MakeService<Target, Request>>::Future
impl<T> Any for Optional<T>
where
T: 'static + ?Sized,
fn type_id(&self) -> TypeId
impl<T> Borrow<T> for Optional<T>
where
T: ?Sized,
fn borrow(&self) -> &T
impl<T> BorrowMut<T> for Optional<T>
where
T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
impl<T> From<T> for Optional<T>
fn from(t: T) -> TReturns the argument unchanged.
impl<T> Instrument for Optional<T>
impl<T> WithSubscriber for Optional<T>
impl<T, Request> ServiceExt<Request> for Optional<T>
where
T: Service<Request> + ?Sized,
impl<T, U> Into<U> for Optional<T>
where
U: From<T>,
fn into(self) -> UCalls
U::from(self).That is, this conversion is whatever the implementation of
[From]<T> for Uchooses to do.
impl<T, U> TryFrom<U> for Optional<T>
where
U: Into<T>,
type Error = never;fn try_from(value: U) -> Result<T, never>
impl<T, U> TryInto<U> for Optional<T>
where
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error;fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>