Enum Either 

pub enum Either<A, B> {
    Left(A),
    Right(B),
}

Combines two different futures, streams, or sinks having the same associated types into a single type.

Variants

Left(A)

First branch of the type

Right(B)

Second branch of the type

Implementations

impl<A, B> Either<A, B>

pub fn is_left(&self) -> bool

Return true if the value is the Left variant.

pub fn is_right(&self) -> bool

Return true if the value is the Right variant.

pub fn left(self) -> Option<A>

Convert the left side of Either<L, R> to an Option<L>.

pub fn right(self) -> Option<B>

Convert the right side of Either<L, R> to an Option<R>.

pub fn as_ref(&self) -> Either<&A, &B>

Convert &Either<L, R> to Either<&L, &R>.

pub fn as_mut(&mut self) -> Either<&mut A, &mut B>

Convert &mut Either<L, R> to Either<&mut L, &mut R>.

impl<T> Either<T, T>

pub fn into_inner(self) -> T

Extract the value of an either over two equivalent types.

Trait Implementations

impl<A: Clone, B: Clone> Clone for Either<A, B>

fn clone(&self) -> Either<A, B>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<A: Copy, B: Copy> Copy for Either<A, B>

impl<A: Debug, B: Debug> Debug for Either<A, B>

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

Formats the value using the given formatter.

impl<A, B> Display for Either<A, B>

where A: Display, B: Display,

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

Formats the value using the given formatter.

impl<A: Eq, B: Eq> Eq for Either<A, B>

impl<A, B> Error for Either<A, B>

where A: Error, B: Error,

Either implements Error if both A and B implement it.

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl<E: Error> From<Either<E, Error>> for Error

fn from(err: Either<E, Error>) -> Self

Converts to this type from the input type.

impl<A, B> Future for Either<A, B>

where A: Future, B: Future<Output = A::Output>,

type Output = <A as Future>::Output

The type of value produced on completion.

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

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

impl<A: Hash, B: Hash> Hash for Either<A, B>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<A: Ord, B: Ord> Ord for Either<A, B>

fn cmp(&self, other: &Either<A, B>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl<A: PartialEq, B: PartialEq> PartialEq for Either<A, B>

fn eq(&self, other: &Either<A, B>) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl<A: PartialOrd, B: PartialOrd> PartialOrd for Either<A, B>

fn partial_cmp(&self, other: &Either<A, B>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<A, B, St, Req> Service<St, Req> for Either<A, B>

where A: Service<St, Req>, B: Service<St, Req, Res = A::Res, Error = A::Error>,

type Res = <A as Service<St, Req>>::Res

Responses that the service could provide.

type Error = <A as Service<St, Req>>::Error

Errors produced by the service while checking readiness or executing a call.

async fn call( &self, req: Req, ctx: Ctx<'_, Self, St>, ) -> Result<Self::Res, Self::Error>

Processes a request and asynchronously returns the response.

async fn ready(&self, ctx: Ctx<'_, Self, St>) -> Result<(), Self::Error>

Returns when the service is ready to process requests.

async fn shutdown(&self, ctx: Ctx<'_, Self, St>)

Shuts down the service.

fn map<F, Res>(self, f: F) -> ServiceChain<Map<F, Self, Res>, St, Req>

where Self: Sized, F: Fn(Self::Res) -> Res,

Maps this service’s output to a different type, returning a new service.

fn map_err<F, E>(self, f: F) -> ServiceChain<MapErr<F, Self, E>, St, Req>

where Self: Sized, F: Fn(Self::Error) -> E,

Maps this service’s error to a different type, returning a new service.

fn and_then<Next, F>(self, f: F) -> ServiceChain<AndThen<Self, Next>, St, Req>

where Self: Sized, Next: Service<St, Self::Res, Error = Self::Error>, F: IntoService<Next, St, Self::Res>,

Call another service after call to this one has resolved successfully.

fn pipeline(self, st: St) -> Pipeline<Req, Self::Res, Self::Error>

where Self: Sized + 'static, St: 'static, Req: 'static,

Wraps it in a container.

impl<A: PartialEq, B: PartialEq> StructuralPartialEq for Either<A, B>