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use std::fmt;
use std::pin::Pin;
use crate::io::{self, BufRead, Read};
use crate::task::{Context, Poll};
pub fn empty() -> Empty {
Empty { _private: () }
}
pub struct Empty {
_private: (),
}
impl fmt::Debug for Empty {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.pad("Empty { .. }")
}
}
impl Read for Empty {
#[inline]
fn poll_read(
self: Pin<&mut Self>,
_: &mut Context<'_>,
_: &mut [u8],
) -> Poll<io::Result<usize>> {
Poll::Ready(Ok(0))
}
}
impl BufRead for Empty {
#[inline]
fn poll_fill_buf<'a>(
self: Pin<&'a mut Self>,
_: &mut Context<'_>,
) -> Poll<io::Result<&'a [u8]>> {
Poll::Ready(Ok(&[]))
}
#[inline]
fn consume(self: Pin<&mut Self>, _: usize) {}
}