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use std::collections::BinaryHeap;
use std::pin::Pin;
use crate::prelude::*;
use crate::stream::{self, IntoStream};
impl<T: Ord + Send> stream::Extend<T> for BinaryHeap<T> {
fn extend<'a, S: IntoStream<Item = T> + 'a>(
&'a mut self,
stream: S,
) -> Pin<Box<dyn Future<Output = ()> + 'a + Send>>
where
<S as IntoStream>::IntoStream: Send,
{
let stream = stream.into_stream();
self.reserve(stream.size_hint().0);
Box::pin(stream.for_each(move |item| self.push(item)))
}
}