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, B> Clone for Either<A, B>

where A: Clone, B: Clone,

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

Returns a copy of the value.

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

Performs copy-assignment from source.

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

where A: Debug, B: Debug,

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

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<(), Error>

Formats the value using the given formatter.

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 From<Either<DecodeError, Error>> for SendRequestError

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

Converts to this type from the input type.

impl From<Either<DecodeError, Error>> for WsClientError

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

Converts to this type from the input type.

impl From<Either<EncodeError, Error>> for SendRequestError

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

Converts to this type from the input type.

impl From<Either<EncodeError, Error>> for WsClientError

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

Converts to this type from the input type.

impl From<Either<PayloadError, Error>> for PayloadError

fn from(err: Either<PayloadError, 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 as Future>::Output>,

type Output = <A as Future>::Output

The type of value produced on completion.

fn poll( self: Pin<&mut Either<A, B>>, cx: &mut Context<'_>, ) -> Poll<<Either<A, B> as Future>::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, B> Hash for Either<A, B>

where A: Hash, B: Hash,

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

where __H: Hasher,

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, B> Ord for Either<A, B>

where A: Ord, B: Ord,

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.

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

where A: PartialEq, B: PartialEq,

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

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

where A: PartialOrd, B: PartialOrd,

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, Err> Responder<Err> for Either<A, B>

where A: Responder<Err>, B: Responder<Err>, Err: ErrorRenderer,

Combines two different responder types into a single type

use ntex::{web::HttpResponse, util::Either};

fn index() -> Either<HttpResponse, &'static str> {
    if is_a_variant() {
        // <- choose left variant
        Either::Left(HttpResponse::BadRequest().body("Bad data"))
    } else {
        // <- Right variant
        Either::Right("Hello!")
    }
}

async fn respond_to(self, req: &HttpRequest) -> Response

Convert itself to http response.

fn with_status(self, status: StatusCode) -> CustomResponder<Self, Err>

where Self: Sized,

Override a status code for a Responder.

fn with_header<K, V>(self, key: K, value: V) -> CustomResponder<Self, Err>

where Self: Sized, HeaderName: TryFrom<K>, HeaderValue: TryFrom<V>, <HeaderName as TryFrom<K>>::Error: Into<HttpError>, <HeaderValue as TryFrom<V>>::Error: Into<HttpError>,

Add header to the Responder’s response.

impl<A, B, Err> WebResponseError<Err> for Either<A, B>

where A: WebResponseError<Err>, B: WebResponseError<Err>, Err: ErrorRenderer,

fn status_code(&self) -> StatusCode

Response’s status code

fn error_response(&self, req: &HttpRequest) -> HttpResponse

Generate response for error

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

where A: Copy, B: Copy,

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

where A: Eq, B: Eq,

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