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Implement BufRead for VecDeque<u8> #110604

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Oct 15, 2023
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Implement BufRead for VecDeque<u8> #110604

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18 changes: 18 additions & 0 deletions library/std/src/io/impls.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -436,6 436,24 @@ impl<A: Allocator> Read for VecDeque<u8, A> {
}
}

/// BufRead is implemented for `VecDeque<u8>` by reading bytes from the front of the `VecDeque`.
#[stable(feature = "vecdeque_buf_read", since = "CURRENT_RUSTC_VERSION")]
impl<A: Allocator> BufRead for VecDeque<u8, A> {
/// Returns the contents of the "front" slice as returned by
/// [`as_slices`][`VecDeque::as_slices`]. If the contained byte slices of the `VecDeque` are
/// discontiguous, multiple calls to `fill_buf` will be needed to read the entire content.
#[inline]
fn fill_buf(&mut self) -> io::Result<&[u8]> {
let (front, _) = self.as_slices();
Ok(front)
}

#[inline]
fn consume(&mut self, amt: usize) {
self.drain(..amt);
}
}

/// Write is implemented for `VecDeque<u8>` by appending to the `VecDeque`, growing it as needed.
#[stable(feature = "vecdeque_read_write", since = "1.63.0")]
impl<A: Allocator> Write for VecDeque<u8, A> {
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