forked from mirror/async-std
bac74c2d7f
* Add future::poll_fn * Replace all uses of poll_fn with the new one * Remove some uses of futures * Simplify ReadDir and DirEntry * Remove some use of futures from File * Use futures subcrates * Fix imports in docs * Remove futures-util dependency * Remove futures-executor-preview * Refactor * Require more features in the futures-preview crate
62 lines
1.3 KiB
Rust
62 lines
1.3 KiB
Rust
use std::fmt;
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use std::pin::Pin;
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use futures_io::AsyncWrite;
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use crate::io;
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use crate::task::{Context, Poll};
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/// Creates a writer that consumes and drops all data.
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///
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/// # Examples
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///
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/// ```rust
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/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
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/// #
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/// use async_std::io;
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/// use async_std::prelude::*;
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///
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/// let mut writer = io::sink();
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/// writer.write(b"hello world").await?;
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/// #
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/// # Ok(()) }) }
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/// ```
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pub fn sink() -> Sink {
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Sink { _priv: () }
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}
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/// A writer that consumes and drops all data.
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///
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/// This writer is constructed by the [`sink`] function.
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///
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/// [`sink`]: fn.sink.html
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pub struct Sink {
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_priv: (),
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}
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impl fmt::Debug for Sink {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.pad("Sink { .. }")
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}
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}
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impl AsyncWrite for Sink {
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#[inline]
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fn poll_write(
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self: Pin<&mut Self>,
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_: &mut Context<'_>,
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buf: &[u8],
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) -> Poll<io::Result<usize>> {
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Poll::Ready(Ok(buf.len()))
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}
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#[inline]
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fn poll_flush(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<()>> {
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Poll::Ready(Ok(()))
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}
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#[inline]
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fn poll_close(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<()>> {
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Poll::Ready(Ok(()))
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}
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}
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