diff options
author | Carl Lerche <me@carllerche.com> | 2020-10-21 14:08:49 -0700 |
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committer | GitHub <noreply@github.com> | 2020-10-21 14:08:49 -0700 |
commit | 8dbc3c79379f2243fc04d444239d009c1c610016 (patch) | |
tree | 80c6d9483db9710c4a3b6a22b4740ec4e620cfa1 /tokio/tests/io_read_buf.rs | |
parent | 7fbfa9b649b16de6096eb673f8debfb900618987 (diff) |
io: add `AsyncReadExt::read_buf` (#3003)
Brings back `read_buf` from 0.2. This will be stabilized as part of 1.0.
Diffstat (limited to 'tokio/tests/io_read_buf.rs')
-rw-r--r-- | tokio/tests/io_read_buf.rs | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/tokio/tests/io_read_buf.rs b/tokio/tests/io_read_buf.rs new file mode 100644 index 00000000..0328168d --- /dev/null +++ b/tokio/tests/io_read_buf.rs @@ -0,0 +1,36 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] + +use tokio::io::{AsyncRead, AsyncReadExt, ReadBuf}; +use tokio_test::assert_ok; + +use std::io; +use std::pin::Pin; +use std::task::{Context, Poll}; + +#[tokio::test] +async fn read_buf() { + struct Rd { + cnt: usize, + } + + impl AsyncRead for Rd { + fn poll_read( + mut self: Pin<&mut Self>, + _cx: &mut Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll<io::Result<()>> { + self.cnt += 1; + buf.put_slice(b"hello world"); + Poll::Ready(Ok(())) + } + } + + let mut buf = vec![]; + let mut rd = Rd { cnt: 0 }; + + let n = assert_ok!(rd.read_buf(&mut buf).await); + assert_eq!(1, rd.cnt); + assert_eq!(n, 11); + assert_eq!(buf[..], b"hello world"[..]); +} |