Trait rbatis_core::runtime::stream::Extend[−][src]

pub trait Extend<A> {
    fn extend<'a, T>(
        &'a mut self, 
        stream: T
    ) -> Pin<Box<dyn Future<Output = ()> + 'a + Send, Global>>ⓘ
Notable traits for Pin<P>
impl<P> Future for Pin<P> where
    P: Unpin + DerefMut,
    <P as Deref>::Target: Future,     type Output = <<P as Deref>::Target as Future>::Output;

    where
        T: 'a + IntoStream<Item = A>,
        <T as IntoStream>::IntoStream: Send;
}
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

Extends a collection with the contents of a stream.

Implementations on Foreign Types

Implementors