Struct futures_lite::io::Cursor [−][src]
pub struct Cursor<T> { /* fields omitted */ }
Expand description
Gives an in-memory buffer a cursor for reading and writing.
Examples
use futures_lite::io::{AsyncReadExt, AsyncSeekExt, AsyncWriteExt, Cursor, SeekFrom}; let mut bytes = b"hello".to_vec(); let mut cursor = Cursor::new(&mut bytes); // Overwrite 'h' with 'H'. cursor.write_all(b"H").await?; // Move the cursor one byte forward. cursor.seek(SeekFrom::Current(1)).await?; // Read a byte. let mut byte = [0]; cursor.read_exact(&mut byte).await?; assert_eq!(&byte, b"l"); // Check the final buffer. assert_eq!(bytes, b"Hello");
Implementations
impl<T> Cursor<T>
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impl<T> Cursor<T>
[src]pub fn new(inner: T) -> Cursor<T>
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pub fn new(inner: T) -> Cursor<T>
[src]Creates a cursor for an in-memory buffer.
Cursor’s initial position is 0 even if the underlying buffer is not empty. Writing using
Cursor
will overwrite the existing contents unless the cursor is moved to the end of
the buffer using set_position()
or
[seek()
][AsyncSeekExt::seek()
].
Examples
use futures_lite::io::Cursor; let cursor = Cursor::new(Vec::<u8>::new());
pub fn get_ref(&self) -> &T
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pub fn get_ref(&self) -> &T
[src]Gets a reference to the underlying buffer.
Examples
use futures_lite::io::Cursor; let cursor = Cursor::new(Vec::<u8>::new()); let r = cursor.get_ref();
pub fn get_mut(&mut self) -> &mut T
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pub fn get_mut(&mut self) -> &mut T
[src]Gets a mutable reference to the underlying buffer.
Examples
use futures_lite::io::Cursor; let mut cursor = Cursor::new(Vec::<u8>::new()); let r = cursor.get_mut();
pub fn into_inner(self) -> T
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pub fn into_inner(self) -> T
[src]Unwraps the cursor, returning the underlying buffer.
Examples
use futures_lite::io::Cursor; let cursor = Cursor::new(vec![1, 2, 3]); assert_eq!(cursor.into_inner(), [1, 2, 3]);
pub fn position(&self) -> u64
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pub fn position(&self) -> u64
[src]Returns the current position of this cursor.
Examples
use futures_lite::io::{AsyncSeekExt, Cursor, SeekFrom}; let mut cursor = Cursor::new(b"hello"); assert_eq!(cursor.position(), 0); cursor.seek(SeekFrom::Start(2)).await?; assert_eq!(cursor.position(), 2);
pub fn set_position(&mut self, pos: u64)
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pub fn set_position(&mut self, pos: u64)
[src]Sets the position of this cursor.
Examples
use futures_lite::io::Cursor; let mut cursor = Cursor::new(b"hello"); assert_eq!(cursor.position(), 0); cursor.set_position(2); assert_eq!(cursor.position(), 2);
Trait Implementations
impl<T> AsyncBufRead for Cursor<T> where
T: AsRef<[u8]> + Unpin,
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impl<T> AsyncBufRead for Cursor<T> where
T: AsRef<[u8]> + Unpin,
[src]impl<T> AsyncRead for Cursor<T> where
T: AsRef<[u8]> + Unpin,
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impl<T> AsyncRead for Cursor<T> where
T: AsRef<[u8]> + Unpin,
[src]impl AsyncWrite for Cursor<&mut [u8]>
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impl AsyncWrite for Cursor<&mut [u8]>
[src]fn poll_write(
self: Pin<&mut Self>,
_: &mut Context<'_>,
buf: &[u8]
) -> Poll<Result<usize>>
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fn poll_write(
self: Pin<&mut Self>,
_: &mut Context<'_>,
buf: &[u8]
) -> Poll<Result<usize>>
[src]Attempt to write bytes from buf
into the object. Read more
fn poll_write_vectored(
self: Pin<&mut Self>,
_: &mut Context<'_>,
bufs: &[IoSlice<'_>]
) -> Poll<Result<usize>>
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fn poll_write_vectored(
self: Pin<&mut Self>,
_: &mut Context<'_>,
bufs: &[IoSlice<'_>]
) -> Poll<Result<usize>>
[src]Attempt to write bytes from bufs
into the object using vectored
IO operations. Read more
impl AsyncWrite for Cursor<&mut Vec<u8>>
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impl AsyncWrite for Cursor<&mut Vec<u8>>
[src]fn poll_write(
self: Pin<&mut Self>,
_: &mut Context<'_>,
buf: &[u8]
) -> Poll<Result<usize>>
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fn poll_write(
self: Pin<&mut Self>,
_: &mut Context<'_>,
buf: &[u8]
) -> Poll<Result<usize>>
[src]Attempt to write bytes from buf
into the object. Read more
fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>>
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fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>>
[src]Attempt to close the object. Read more
impl AsyncWrite for Cursor<Vec<u8>>
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impl AsyncWrite for Cursor<Vec<u8>>
[src]fn poll_write(
self: Pin<&mut Self>,
_: &mut Context<'_>,
buf: &[u8]
) -> Poll<Result<usize>>
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fn poll_write(
self: Pin<&mut Self>,
_: &mut Context<'_>,
buf: &[u8]
) -> Poll<Result<usize>>
[src]Attempt to write bytes from buf
into the object. Read more
fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>>
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fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>>
[src]Attempt to close the object. Read more
Auto Trait Implementations
impl<T> RefUnwindSafe for Cursor<T> where
T: RefUnwindSafe,
T: RefUnwindSafe,
impl<T> Send for Cursor<T> where
T: Send,
T: Send,
impl<T> Sync for Cursor<T> where
T: Sync,
T: Sync,
impl<T> Unpin for Cursor<T> where
T: Unpin,
T: Unpin,
impl<T> UnwindSafe for Cursor<T> where
T: UnwindSafe,
T: UnwindSafe,
Blanket Implementations
impl<R> AsyncBufReadExt for R where
R: AsyncBufRead + ?Sized,
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impl<R> AsyncBufReadExt for R where
R: AsyncBufRead + ?Sized,
[src]fn fill_buf(&mut self) -> FillBuf<'_, Self>ⓘ where
Self: Unpin,
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fn fill_buf(&mut self) -> FillBuf<'_, Self>ⓘ where
Self: Unpin,
[src]Returns the contents of the internal buffer, filling it with more data if empty. Read more
fn read_until<'a>(
&'a mut self,
byte: u8,
buf: &'a mut Vec<u8>
) -> ReadUntilFuture<'_, Self>ⓘNotable traits for ReadUntilFuture<'_, R>
impl<R: AsyncBufRead + Unpin + ?Sized> Future for ReadUntilFuture<'_, R> type Output = Result<usize>;
where
Self: Unpin,
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fn read_until<'a>(
&'a mut self,
byte: u8,
buf: &'a mut Vec<u8>
) -> ReadUntilFuture<'_, Self>ⓘNotable traits for ReadUntilFuture<'_, R>
impl<R: AsyncBufRead + Unpin + ?Sized> Future for ReadUntilFuture<'_, R> type Output = Result<usize>;
where
Self: Unpin,
[src]Reads all bytes and appends them into buf
until the delimiter byte
or EOF is found. Read more
fn read_line<'a>(&'a mut self, buf: &'a mut String) -> ReadLineFuture<'_, Self>ⓘNotable traits for ReadLineFuture<'_, R>
impl<R: AsyncBufRead + Unpin + ?Sized> Future for ReadLineFuture<'_, R> type Output = Result<usize>;
where
Self: Unpin,
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fn read_line<'a>(&'a mut self, buf: &'a mut String) -> ReadLineFuture<'_, Self>ⓘNotable traits for ReadLineFuture<'_, R>
impl<R: AsyncBufRead + Unpin + ?Sized> Future for ReadLineFuture<'_, R> type Output = Result<usize>;
where
Self: Unpin,
[src]Reads all bytes and appends them into buf
until a newline (the 0xA byte) or EOF is found. Read more
impl<R> AsyncReadExt for R where
R: AsyncRead + ?Sized,
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impl<R> AsyncReadExt for R where
R: AsyncRead + ?Sized,
[src]fn read<'a>(&'a mut self, buf: &'a mut [u8]) -> ReadFuture<'a, Self>ⓘNotable traits for ReadFuture<'_, R>
impl<R: AsyncRead + Unpin + ?Sized> Future for ReadFuture<'_, R> type Output = Result<usize>;
where
Self: Unpin,
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fn read<'a>(&'a mut self, buf: &'a mut [u8]) -> ReadFuture<'a, Self>ⓘNotable traits for ReadFuture<'_, R>
impl<R: AsyncRead + Unpin + ?Sized> Future for ReadFuture<'_, R> type Output = Result<usize>;
where
Self: Unpin,
[src]Reads some bytes from the byte stream. Read more
fn read_vectored<'a>(
&'a mut self,
bufs: &'a mut [IoSliceMut<'a>]
) -> ReadVectoredFuture<'a, Self>ⓘNotable traits for ReadVectoredFuture<'_, R>
impl<R: AsyncRead + Unpin + ?Sized> Future for ReadVectoredFuture<'_, R> type Output = Result<usize>;
where
Self: Unpin,
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fn read_vectored<'a>(
&'a mut self,
bufs: &'a mut [IoSliceMut<'a>]
) -> ReadVectoredFuture<'a, Self>ⓘNotable traits for ReadVectoredFuture<'_, R>
impl<R: AsyncRead + Unpin + ?Sized> Future for ReadVectoredFuture<'_, R> type Output = Result<usize>;
where
Self: Unpin,
[src]fn read_to_end<'a>(
&'a mut self,
buf: &'a mut Vec<u8>
) -> ReadToEndFuture<'a, Self>ⓘNotable traits for ReadToEndFuture<'_, R>
impl<R: AsyncRead + Unpin + ?Sized> Future for ReadToEndFuture<'_, R> type Output = Result<usize>;
where
Self: Unpin,
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fn read_to_end<'a>(
&'a mut self,
buf: &'a mut Vec<u8>
) -> ReadToEndFuture<'a, Self>ⓘNotable traits for ReadToEndFuture<'_, R>
impl<R: AsyncRead + Unpin + ?Sized> Future for ReadToEndFuture<'_, R> type Output = Result<usize>;
where
Self: Unpin,
[src]fn read_to_string<'a>(
&'a mut self,
buf: &'a mut String
) -> ReadToStringFuture<'a, Self>ⓘNotable traits for ReadToStringFuture<'_, R>
impl<R: AsyncRead + Unpin + ?Sized> Future for ReadToStringFuture<'_, R> type Output = Result<usize>;
where
Self: Unpin,
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fn read_to_string<'a>(
&'a mut self,
buf: &'a mut String
) -> ReadToStringFuture<'a, Self>ⓘNotable traits for ReadToStringFuture<'_, R>
impl<R: AsyncRead + Unpin + ?Sized> Future for ReadToStringFuture<'_, R> type Output = Result<usize>;
where
Self: Unpin,
[src]fn read_exact<'a>(&'a mut self, buf: &'a mut [u8]) -> ReadExactFuture<'a, Self>ⓘNotable traits for ReadExactFuture<'_, R>
impl<R: AsyncRead + Unpin + ?Sized> Future for ReadExactFuture<'_, R> type Output = Result<()>;
where
Self: Unpin,
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fn read_exact<'a>(&'a mut self, buf: &'a mut [u8]) -> ReadExactFuture<'a, Self>ⓘNotable traits for ReadExactFuture<'_, R>
impl<R: AsyncRead + Unpin + ?Sized> Future for ReadExactFuture<'_, R> type Output = Result<()>;
where
Self: Unpin,
[src]Reads the exact number of bytes required to fill buf
. Read more
fn take(self, limit: u64) -> Take<Self> where
Self: Sized,
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fn take(self, limit: u64) -> Take<Self> where
Self: Sized,
[src]Creates an adapter which will read at most limit
bytes from it. Read more
impl<S> AsyncSeekExt for S where
S: AsyncSeek + ?Sized,
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impl<S> AsyncSeekExt for S where
S: AsyncSeek + ?Sized,
[src]fn seek(&mut self, pos: SeekFrom) -> SeekFuture<'_, Self>ⓘNotable traits for SeekFuture<'_, S>
impl<S: AsyncSeek + Unpin + ?Sized> Future for SeekFuture<'_, S> type Output = Result<u64>;
where
Self: Unpin,
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fn seek(&mut self, pos: SeekFrom) -> SeekFuture<'_, Self>ⓘNotable traits for SeekFuture<'_, S>
impl<S: AsyncSeek + Unpin + ?Sized> Future for SeekFuture<'_, S> type Output = Result<u64>;
where
Self: Unpin,
[src]Seeks to a new position in a byte stream. Read more
impl<W> AsyncWriteExt for W where
W: AsyncWrite + ?Sized,
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impl<W> AsyncWriteExt for W where
W: AsyncWrite + ?Sized,
[src]fn write<'a>(&'a mut self, buf: &'a [u8]) -> WriteFuture<'a, Self>ⓘNotable traits for WriteFuture<'_, W>
impl<W: AsyncWrite + Unpin + ?Sized> Future for WriteFuture<'_, W> type Output = Result<usize>;
where
Self: Unpin,
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fn write<'a>(&'a mut self, buf: &'a [u8]) -> WriteFuture<'a, Self>ⓘNotable traits for WriteFuture<'_, W>
impl<W: AsyncWrite + Unpin + ?Sized> Future for WriteFuture<'_, W> type Output = Result<usize>;
where
Self: Unpin,
[src]Writes some bytes into the byte stream. Read more
fn write_vectored<'a>(
&'a mut self,
bufs: &'a [IoSlice<'a>]
) -> WriteVectoredFuture<'a, Self>ⓘNotable traits for WriteVectoredFuture<'_, W>
impl<W: AsyncWrite + Unpin + ?Sized> Future for WriteVectoredFuture<'_, W> type Output = Result<usize>;
where
Self: Unpin,
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fn write_vectored<'a>(
&'a mut self,
bufs: &'a [IoSlice<'a>]
) -> WriteVectoredFuture<'a, Self>ⓘNotable traits for WriteVectoredFuture<'_, W>
impl<W: AsyncWrite + Unpin + ?Sized> Future for WriteVectoredFuture<'_, W> type Output = Result<usize>;
where
Self: Unpin,
[src]fn write_all<'a>(&'a mut self, buf: &'a [u8]) -> WriteAllFuture<'a, Self>ⓘNotable traits for WriteAllFuture<'_, W>
impl<W: AsyncWrite + Unpin + ?Sized> Future for WriteAllFuture<'_, W> type Output = Result<()>;
where
Self: Unpin,
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fn write_all<'a>(&'a mut self, buf: &'a [u8]) -> WriteAllFuture<'a, Self>ⓘNotable traits for WriteAllFuture<'_, W>
impl<W: AsyncWrite + Unpin + ?Sized> Future for WriteAllFuture<'_, W> type Output = Result<()>;
where
Self: Unpin,
[src]Writes an entire buffer into the byte stream. Read more
fn flush(&mut self) -> FlushFuture<'_, Self>ⓘNotable traits for FlushFuture<'_, W>
impl<W: AsyncWrite + Unpin + ?Sized> Future for FlushFuture<'_, W> type Output = Result<()>;
where
Self: Unpin,
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fn flush(&mut self) -> FlushFuture<'_, Self>ⓘNotable traits for FlushFuture<'_, W>
impl<W: AsyncWrite + Unpin + ?Sized> Future for FlushFuture<'_, W> type Output = Result<()>;
where
Self: Unpin,
[src]Flushes the stream to ensure that all buffered contents reach their destination. Read more
fn close(&mut self) -> CloseFuture<'_, Self>ⓘNotable traits for CloseFuture<'_, W>
impl<W: AsyncWrite + Unpin + ?Sized> Future for CloseFuture<'_, W> type Output = Result<()>;
where
Self: Unpin,
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fn close(&mut self) -> CloseFuture<'_, Self>ⓘNotable traits for CloseFuture<'_, W>
impl<W: AsyncWrite + Unpin + ?Sized> Future for CloseFuture<'_, W> type Output = Result<()>;
where
Self: Unpin,
[src]Closes the writer. Read more
fn boxed_writer<'a>(self) -> Pin<Box<dyn AsyncWrite + Send + 'a>> where
Self: Sized + Send + 'a,
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fn boxed_writer<'a>(self) -> Pin<Box<dyn AsyncWrite + Send + 'a>> where
Self: Sized + Send + 'a,
[src]Boxes the writer and changes its type to dyn AsyncWrite + Send + 'a
. Read more
impl<T> BorrowMut<T> for T where
T: ?Sized,
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impl<T> BorrowMut<T> for T where
T: ?Sized,
[src]pub fn borrow_mut(&mut self) -> &mut T
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pub fn borrow_mut(&mut self) -> &mut T
[src]Mutably borrows from an owned value. Read more
impl<T> ToOwned for T where
T: Clone,
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impl<T> ToOwned for T where
T: Clone,
[src]type Owned = T
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
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pub fn to_owned(&self) -> T
[src]Creates owned data from borrowed data, usually by cloning. Read more
pub fn clone_into(&self, target: &mut T)
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pub fn clone_into(&self, target: &mut T)
[src]🔬 This is a nightly-only experimental API. (toowned_clone_into
)
recently added
Uses borrowed data to replace owned data, usually by cloning. Read more