Trait Extend 

pub trait Extend<A> {
    // Required method
    fn extend<'a, T: IntoStream<Item = A> + 'a>(
        &'a mut self,
        stream: T,
    ) -> Pin<Box<dyn Future<Output = ()> + 'a>>;
}

Available on unstable only.

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

fn extend<'a, T: IntoStream<Item = A> + 'a>( &'a mut self, stream: T, ) -> Pin<Box<dyn Future<Output = ()> + 'a>>

Extends a collection with the contents of a stream.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl Extend<()> for ()

fn extend<'a, T: IntoStream<Item = ()> + 'a>( &'a mut self, stream: T, ) -> Pin<Box<dyn Future<Output = ()> + 'a>>

impl Extend<String> for String

fn extend<'a, S: IntoStream<Item = String> + 'a>( &'a mut self, stream: S, ) -> Pin<Box<dyn Future<Output = ()> + 'a>>

impl Extend<char> for String

fn extend<'a, S: IntoStream<Item = char> + 'a>( &'a mut self, stream: S, ) -> Pin<Box<dyn Future<Output = ()> + 'a>>

impl<'b> Extend<&'b char> for String

fn extend<'a, S: IntoStream<Item = &'b char> + 'a>( &'a mut self, stream: S, ) -> Pin<Box<dyn Future<Output = ()> + 'a>>

impl<'b> Extend<&'b str> for String

fn extend<'a, S: IntoStream<Item = &'b str> + 'a>( &'a mut self, stream: S, ) -> Pin<Box<dyn Future<Output = ()> + 'a>>

impl<'b> Extend<Cow<'b, str>> for String

fn extend<'a, S: IntoStream<Item = Cow<'b, str>> + 'a>( &'a mut self, stream: S, ) -> Pin<Box<dyn Future<Output = ()> + 'a>>

impl<K, V, H> Extend<(K, V)> for HashMap<K, V, H>

where K: Eq + Hash, H: BuildHasher + Default,

fn extend<'a, S: IntoStream<Item = (K, V)> + 'a>( &'a mut self, stream: S, ) -> Pin<Box<dyn Future<Output = ()> + 'a>>

impl<K: Ord, V> Extend<(K, V)> for BTreeMap<K, V>

fn extend<'a, S: IntoStream<Item = (K, V)> + 'a>( &'a mut self, stream: S, ) -> Pin<Box<dyn Future<Output = ()> + 'a>>

impl<T, H> Extend<T> for HashSet<T, H>

where T: Eq + Hash, H: BuildHasher + Default,

fn extend<'a, S: IntoStream<Item = T> + 'a>( &'a mut self, stream: S, ) -> Pin<Box<dyn Future<Output = ()> + 'a>>

impl<T: Ord> Extend<T> for BTreeSet<T>

fn extend<'a, S: IntoStream<Item = T> + 'a>( &'a mut self, stream: S, ) -> Pin<Box<dyn Future<Output = ()> + 'a>>

impl<T: Ord> Extend<T> for BinaryHeap<T>

fn extend<'a, S: IntoStream<Item = T> + 'a>( &'a mut self, stream: S, ) -> Pin<Box<dyn Future<Output = ()> + 'a>>

impl<T> Extend<T> for LinkedList<T>

fn extend<'a, S: IntoStream<Item = T> + 'a>( &'a mut self, stream: S, ) -> Pin<Box<dyn Future<Output = ()> + 'a>>

impl<T> Extend<T> for Vec<T>

fn extend<'a, S: IntoStream<Item = T> + 'a>( &'a mut self, stream: S, ) -> Pin<Box<dyn Future<Output = ()> + 'a>>

impl<T> Extend<T> for VecDeque<T>

fn extend<'a, S: IntoStream<Item = T> + 'a>( &'a mut self, stream: S, ) -> Pin<Box<dyn Future<Output = ()> + 'a>>

Implementors

impl<P: AsRef<Path>> Extend<P> for PathBuf

Available on crate features default and unstable only.