Struct rocket::response::stream::One

pub struct One<T: Unpin>(/* private fields */);

A stream that yields exactly one value.

A ReaderStream which wraps this type and yields one AsyncRead is returned by ReaderStream::one(). A One can also be constructed via One::from().

Example

use rocket::response::stream::One;
use rocket::futures::stream::StreamExt;

let mut stream = One::from("hello!");
let values: Vec<_> = stream.collect().await;
assert_eq!(values, ["hello!"]);

Trait Implementations

impl<T: Unpin> From<T> for One<T>

Returns a One stream that will yield value exactly once.

Example

use rocket::response::stream::One;

let mut stream = One::from("hello!");

fn from(value: T) -> Self

Converts to this type from the input type.

impl<T: Unpin> Stream for One<T>

type Item = T

Values yielded by the stream.

fn poll_next( self: Pin<&mut Self>, _: &mut Context<'_> ) -> Poll<Option<Self::Item>>

Attempt to pull out the next value of this stream, registering the current task for wakeup if the value is not yet available, and returning None if the stream is exhausted.

fn size_hint(&self) -> (usize, Option<usize>)

Returns the bounds on the remaining length of the stream.