Enum ntex::util::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)

Tuple Fields

0: A

First branch of the type

Right(B)

Tuple Fields

0: 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<A, B, T> Either<(T, A), (T, B)>

pub fn factor_first(self) -> (T, Either<A, B>)

Factor out a homogeneous type from an either of pairs.

Here, the homogeneous type is the first element of the pairs.

impl<A, B, T> Either<(A, T), (B, T)>

pub fn factor_second(self) -> (Either<A, B>, T)

Factor out a homogeneous type from an either of pairs.

Here, the homogeneous type is the second element of the pairs.

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, 

pub 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, 

pub 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, 

pub 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)>

The lower-level source of this error, if any.

fn backtrace(&self) -> Option<&Backtrace>

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

Returns a stack backtrace, if available, of where this error occurred.

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

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

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

Performs the conversion.

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

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

Performs the conversion.

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

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

Performs the conversion.

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

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

Performs the conversion.

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

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

Performs the conversion.

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.

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

Attempt 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, 

pub 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, 

Feeds a slice of this type into the given Hasher.

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

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

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

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

Restrict a value to a certain interval.

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

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

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

pub 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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

This method 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!")
    }
}

type Error = Err::Container

The associated error which can be returned.

type Future = Either<A::Future, B::Future>

The future response value.

fn respond_to(self, req: &HttpRequest) -> Self::Future

Convert itself to AsyncResult or Error.

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> StructuralEq for Either<A, B>

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