1 use std::pin::Pin; 2 use std::future::Future; 3 4 use crate::io::{self, Write}; 5 use crate::task::{Context, Poll}; 6 7 #[doc(hidden)] 8 #[allow(missing_debug_implementations)] 9 pub struct FlushFuture<'a, T: Unpin + ?Sized> { 10 pub(crate) writer: &'a mut T, 11 } 12 13 impl<T: Write + Unpin + ?Sized> Future for FlushFuture<'_, T> { 14 type Output = io::Result<()>; 15 poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>16 fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { 17 Pin::new(&mut *self.writer).poll_flush(cx) 18 } 19 } 20