pub trait Extend<A> {
// Required method
fn extend<'a, T: IntoStream<Item = A> + 'a>(
&'a mut self,
stream: T,
) -> Pin<Box<dyn Future<Output = ()> + Send + 'a>>
where <T as IntoStream>::IntoStream: Send;
}Available on
unstable only.Expand description
Extends a collection with the contents of a stream.
Streams produce a series of values asynchronously, and collections can also be thought of as a
series of values. The Extend trait bridges this gap, allowing you to extend a collection
asynchronously by including the contents of that stream. When extending a collection with an
already existing key, that entry is updated or, in the case of collections that permit multiple
entries with equal keys, that entry is inserted.
§Examples
use async_std::prelude::*;
use async_std::stream;
let mut v: Vec<usize> = vec![1, 2];
let s = stream::repeat(3usize).take(3);
stream::Extend::extend(&mut v, s).await;
assert_eq!(v, vec![1, 2, 3, 3, 3]);Required Methods§
Dyn Compatibility§
This trait is not dyn compatible.
In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.