pub enum Either<A, B> {
A(A),
B(B),
}
Expand description
Combines two different responder types into a single type
use actix_web::{AsyncResponder, Either, Error, HttpRequest, HttpResponse};
use futures::future::result;
type RegisterResult =
Either<HttpResponse, Box<Future<Item = HttpResponse, Error = Error>>>;
fn index(req: HttpRequest) -> RegisterResult {
if is_a_variant() {
// <- choose variant A
Either::A(HttpResponse::BadRequest().body("Bad data"))
} else {
Either::B(
// <- variant B
result(Ok(HttpResponse::Ok()
.content_type("text/html")
.body("Hello!")))
.responder(),
)
}
}
Variants
A(A)
First branch of the type
B(B)
Second branch of the type
Trait Implementations
sourceimpl<A, B, I, E> Future for Either<A, B>where
A: Future<Item = I, Error = E>,
B: Future<Item = I, Error = E>,
impl<A, B, I, E> Future for Either<A, B>where
A: Future<Item = I, Error = E>,
B: Future<Item = I, Error = E>,
type Error = E
type Error = E
The type of error that this future will resolve with if it fails in a
normal fashion. Read more
sourcefn poll(&mut self) -> Poll<I, E>
fn poll(&mut self) -> Poll<I, E>
Query this future to see if its value has become available, registering
interest if it is not. Read more
sourcefn wait(self) -> Result<Self::Item, Self::Error>where
Self: Sized,
fn wait(self) -> Result<Self::Item, Self::Error>where
Self: Sized,
Block the current thread until this future is resolved. Read more
sourcefn map<F, U>(self, f: F) -> Map<Self, F>where
F: FnOnce(Self::Item) -> U,
Self: Sized,
fn map<F, U>(self, f: F) -> Map<Self, F>where
F: FnOnce(Self::Item) -> U,
Self: Sized,
Map this future’s result to a different type, returning a new future of
the resulting type. Read more
sourcefn map_err<F, E>(self, f: F) -> MapErr<Self, F>where
F: FnOnce(Self::Error) -> E,
Self: Sized,
fn map_err<F, E>(self, f: F) -> MapErr<Self, F>where
F: FnOnce(Self::Error) -> E,
Self: Sized,
Map this future’s error to a different error, returning a new future. Read more
sourcefn from_err<E>(self) -> FromErr<Self, E>where
E: From<Self::Error>,
Self: Sized,
fn from_err<E>(self) -> FromErr<Self, E>where
E: From<Self::Error>,
Self: Sized,
Map this future’s error to any error implementing
From
for
this future’s Error
, returning a new future. Read moresourcefn then<F, B>(self, f: F) -> Then<Self, B, F>where
F: FnOnce(Result<Self::Item, Self::Error>) -> B,
B: IntoFuture,
Self: Sized,
fn then<F, B>(self, f: F) -> Then<Self, B, F>where
F: FnOnce(Result<Self::Item, Self::Error>) -> B,
B: IntoFuture,
Self: Sized,
Chain on a computation for when a future finished, passing the result of
the future to the provided closure
f
. Read moresourcefn and_then<F, B>(self, f: F) -> AndThen<Self, B, F>where
F: FnOnce(Self::Item) -> B,
B: IntoFuture<Error = Self::Error>,
Self: Sized,
fn and_then<F, B>(self, f: F) -> AndThen<Self, B, F>where
F: FnOnce(Self::Item) -> B,
B: IntoFuture<Error = Self::Error>,
Self: Sized,
Execute another future after this one has resolved successfully. Read more
sourcefn or_else<F, B>(self, f: F) -> OrElse<Self, B, F>where
F: FnOnce(Self::Error) -> B,
B: IntoFuture<Item = Self::Item>,
Self: Sized,
fn or_else<F, B>(self, f: F) -> OrElse<Self, B, F>where
F: FnOnce(Self::Error) -> B,
B: IntoFuture<Item = Self::Item>,
Self: Sized,
Execute another future if this one resolves with an error. Read more
sourcefn select<B>(self, other: B) -> Select<Self, <B as IntoFuture>::Future>where
B: IntoFuture<Item = Self::Item, Error = Self::Error>,
Self: Sized,
fn select<B>(self, other: B) -> Select<Self, <B as IntoFuture>::Future>where
B: IntoFuture<Item = Self::Item, Error = Self::Error>,
Self: Sized,
Waits for either one of two futures to complete. Read more
sourcefn select2<B>(self, other: B) -> Select2<Self, <B as IntoFuture>::Future>where
B: IntoFuture,
Self: Sized,
fn select2<B>(self, other: B) -> Select2<Self, <B as IntoFuture>::Future>where
B: IntoFuture,
Self: Sized,
Waits for either one of two differently-typed futures to complete. Read more
sourcefn join<B>(self, other: B) -> Join<Self, <B as IntoFuture>::Future>where
B: IntoFuture<Error = Self::Error>,
Self: Sized,
fn join<B>(self, other: B) -> Join<Self, <B as IntoFuture>::Future>where
B: IntoFuture<Error = Self::Error>,
Self: Sized,
Joins the result of two futures, waiting for them both to complete. Read more
sourcefn join3<B, C>(
self,
b: B,
c: C
) -> Join3<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future>where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
Self: Sized,
fn join3<B, C>(
self,
b: B,
c: C
) -> Join3<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future>where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
Self: Sized,
Same as
join
, but with more futures.sourcefn join4<B, C, D>(
self,
b: B,
c: C,
d: D
) -> Join4<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::Future>where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
D: IntoFuture<Error = Self::Error>,
Self: Sized,
fn join4<B, C, D>(
self,
b: B,
c: C,
d: D
) -> Join4<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::Future>where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
D: IntoFuture<Error = Self::Error>,
Self: Sized,
Same as
join
, but with more futures.sourcefn join5<B, C, D, E>(
self,
b: B,
c: C,
d: D,
e: E
) -> Join5<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::Future, <E as IntoFuture>::Future>where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
D: IntoFuture<Error = Self::Error>,
E: IntoFuture<Error = Self::Error>,
Self: Sized,
fn join5<B, C, D, E>(
self,
b: B,
c: C,
d: D,
e: E
) -> Join5<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::Future, <E as IntoFuture>::Future>where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
D: IntoFuture<Error = Self::Error>,
E: IntoFuture<Error = Self::Error>,
Self: Sized,
Same as
join
, but with more futures.sourcefn into_stream(self) -> IntoStream<Self>where
Self: Sized,
fn into_stream(self) -> IntoStream<Self>where
Self: Sized,
Convert this future into a single element stream. Read more
sourcefn fuse(self) -> Fuse<Self>where
Self: Sized,
fn fuse(self) -> Fuse<Self>where
Self: Sized,
Fuse a future such that
poll
will never again be called once it has
completed. Read moresourcefn inspect<F>(self, f: F) -> Inspect<Self, F>where
F: FnOnce(&Self::Item),
Self: Sized,
fn inspect<F>(self, f: F) -> Inspect<Self, F>where
F: FnOnce(&Self::Item),
Self: Sized,
Do something with the item of a future, passing it on. Read more
Create a cloneable handle to this future where all handles will resolve
to the same result. Read more
sourceimpl<A, B> Responder for Either<A, B>where
A: Responder,
B: Responder,
impl<A, B> Responder for Either<A, B>where
A: Responder,
B: Responder,
type Item = AsyncResult<HttpResponse, Error>
type Item = AsyncResult<HttpResponse, Error>
The associated item which can be returned.
sourcefn respond_to<S: 'static>(
self,
req: &HttpRequest<S>
) -> Result<AsyncResult<HttpResponse>, Error>
fn respond_to<S: 'static>(
self,
req: &HttpRequest<S>
) -> Result<AsyncResult<HttpResponse>, Error>
Convert itself to
AsyncResult
or Error
.Auto Trait Implementations
impl<A, B> RefUnwindSafe for Either<A, B>where
A: RefUnwindSafe,
B: RefUnwindSafe,
impl<A, B> Send for Either<A, B>where
A: Send,
B: Send,
impl<A, B> Sync for Either<A, B>where
A: Sync,
B: Sync,
impl<A, B> Unpin for Either<A, B>where
A: Unpin,
B: Unpin,
impl<A, B> UnwindSafe for Either<A, B>where
A: UnwindSafe,
B: UnwindSafe,
Blanket Implementations
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<F> IntoFuture for Fwhere
F: Future,
impl<F> IntoFuture for Fwhere
F: Future,
impl<V, T> VZip<V> for Twhere
V: MultiLane<T>,
impl<V, T> VZip<V> for Twhere
V: MultiLane<T>,
fn vzip(self) -> V
sourceimpl<F, A> WrapFuture<A> for Fwhere
F: Future,
A: Actor,
impl<F, A> WrapFuture<A> for Fwhere
F: Future,
A: Actor,
type Future = FutureWrap<F, A>
type Future = FutureWrap<F, A>
The future that this type can be converted into.
sourcefn into_actor(self, _: &A) -> <F as WrapFuture<A>>::Future
fn into_actor(self, _: &A) -> <F as WrapFuture<A>>::Future
Convert normal future to a ActorFuture