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use crate::io::AsyncWrite;
use std::fmt;
use std::io;
use std::pin::Pin;
use std::task::{Context, Poll};
cfg_io_util! {
pub struct Sink {
_p: (),
}
pub fn sink() -> Sink {
Sink { _p: () }
}
}
impl AsyncWrite for Sink {
#[inline]
fn poll_write(
self: Pin<&mut Self>,
_: &mut Context<'_>,
buf: &[u8],
) -> Poll<Result<usize, io::Error>> {
Poll::Ready(Ok(buf.len()))
}
#[inline]
fn poll_flush(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
Poll::Ready(Ok(()))
}
#[inline]
fn poll_shutdown(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
Poll::Ready(Ok(()))
}
}
impl fmt::Debug for Sink {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.pad("Sink { .. }")
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn assert_unpin() {
crate::is_unpin::<Sink>();
}
}