Struct tower::util::Optional[][src]

pub struct Optional<T> { /* fields omitted */ }
This is supported on crate feature util only.

Optionally forwards requests to an inner service.

If the inner service is None, optional::None is returned as the response.


impl<T> Optional<T>[src]

pub fn new<Request>(inner: Option<T>) -> Optional<T> where
    T: Service<Request>,
    T::Error: Into<BoxError>, 

Create a new Optional.

Trait Implementations

impl<T: Debug> Debug for Optional<T>[src]

impl<T, Request> Service<Request> for Optional<T> where
    T: Service<Request>,
    T::Error: Into<BoxError>, 

type Response = T::Response

Responses given by the service.

type Error = BoxError

Errors produced by the service.

type Future = ResponseFuture<T::Future>

The future response value.

Auto Trait Implementations

impl<T> RefUnwindSafe for Optional<T> where
    T: RefUnwindSafe

impl<T> Send for Optional<T> where
    T: Send

impl<T> Sync for Optional<T> where
    T: Sync

impl<T> Unpin for Optional<T> where
    T: Unpin

impl<T> UnwindSafe for Optional<T> where
    T: UnwindSafe

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized

impl<T> Borrow<T> for T where
    T: ?Sized

impl<T> BorrowMut<T> for T where
    T: ?Sized

impl<T> From<T> for T[src]

impl<T> Instrument for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 

impl<T, Request> ServiceExt<Request> for T where
    T: Service<Request> + ?Sized

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<V, T> VZip<V> for T where
    V: MultiLane<T>,