Struct futures_util::io::Empty[−][src]

#[must_use = "readers do nothing unless polled"]
pub struct Empty { /* fields omitted */ }
This is supported on crate feature io only.
Expand description

Reader for the empty() function.

Trait Implementations

impl AsyncBufRead for Empty[src]

fn poll_fill_buf(
    self: Pin<&mut Self>,
    _: &mut Context<'_>
) -> Poll<Result<&[u8]>>[src]

Attempt to return the contents of the internal buffer, filling it with more data from the inner reader if it is empty. Read more

fn consume(self: Pin<&mut Self>, _: usize)[src]

Tells this buffer that amt bytes have been consumed from the buffer, so they should no longer be returned in calls to poll_read. Read more

impl AsyncRead for Empty[src]

fn poll_read(
    self: Pin<&mut Self>,
    _: &mut Context<'_>,
    _: &mut [u8]
) -> Poll<Result<usize>>[src]

Attempt to read from the AsyncRead into buf. Read more

unsafe fn initializer(&self) -> Initializer[src]

Determines if this AsyncReader can work with buffers of uninitialized memory. Read more

fn poll_read_vectored(
    self: Pin<&mut Self>,
    cx: &mut Context<'_>,
    bufs: &mut [IoSliceMut<'_>]
) -> Poll<Result<usize, Error>>[src]

Attempt to read from the AsyncRead into bufs using vectored IO operations. Read more

impl Debug for Empty[src]

fn fmt(&self, f: &mut Formatter<'_>) -> Result[src]

Formats the value using the given formatter. Read more

Auto Trait Implementations

impl RefUnwindSafe for Empty

impl Send for Empty

impl Sync for Empty

impl Unpin for Empty

impl UnwindSafe for Empty

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized, [src]

pub fn type_id(&self) -> TypeId[src]

Gets the TypeId of self. Read more

impl<R> AsyncBufReadExt for R where
    R: AsyncBufRead + ?Sized, [src]

fn fill_buf(&mut self) -> FillBuf<'_, Self>ⓘ

Notable traits for FillBuf<'a, R>

impl<'a, R: ?Sized> Future for FillBuf<'a, R> where
    R: AsyncBufRead + Unpin,  type Output = Result<&'a [u8]>;
 where
    Self: Unpin, [src]

This is supported on crate feature io only.

Creates a future which will wait for a non-empty buffer to be available from this I/O object or EOF to be reached. Read more

fn consume_unpin(&mut self, amt: usize) where
    Self: Unpin, [src]

This is supported on crate feature io only.

A convenience for calling AsyncBufRead::consume on Unpin IO types. Read more

fn read_until<'a>(
    &'a mut self,
    byte: u8,
    buf: &'a mut Vec<u8>
) -> ReadUntil<'a, Self>ⓘ

Notable traits for ReadUntil<'_, R>

impl<R: AsyncBufRead + ?Sized + Unpin> Future for ReadUntil<'_, R> type Output = Result<usize>;
 where
    Self: Unpin, [src]

This is supported on crate feature io only.

Creates a future which will read all the bytes associated with this I/O object into buf until the delimiter byte or EOF is reached. This method is the async equivalent to BufRead::read_until. Read more

fn read_line<'a>(&'a mut self, buf: &'a mut String) -> ReadLine<'a, Self>ⓘ

Notable traits for ReadLine<'_, R>

impl<R: AsyncBufRead + ?Sized + Unpin> Future for ReadLine<'_, R> type Output = Result<usize>;
 where
    Self: Unpin, [src]

This is supported on crate feature io only.

Creates a future which will read all the bytes associated with this I/O object into buf until a newline (the 0xA byte) or EOF is reached, This method is the async equivalent to BufRead::read_line. Read more

fn lines(self) -> Lines<Self> where
    Self: Sized, [src]

This is supported on crate feature io only.

Returns a stream over the lines of this reader. This method is the async equivalent to BufRead::lines. Read more

impl<R> AsyncReadExt for R where
    R: AsyncRead + ?Sized, [src]

fn chain<R>(self, next: R) -> Chain<Self, R> where
    Self: Sized,
    R: AsyncRead, [src]

This is supported on crate feature io only.

Creates an adaptor which will chain this stream with another. Read more

fn read<'a>(&'a mut self, buf: &'a mut [u8]) -> Read<'a, Self>ⓘ

Notable traits for Read<'_, R>

impl<R: AsyncRead + ?Sized + Unpin> Future for Read<'_, R> type Output = Result<usize>;
 where
    Self: Unpin, [src]

This is supported on crate feature io only.

Tries to read some bytes directly into the given buf in asynchronous manner, returning a future type. Read more

fn read_vectored<'a>(
    &'a mut self,
    bufs: &'a mut [IoSliceMut<'a>]
) -> ReadVectored<'a, Self>ⓘ

Notable traits for ReadVectored<'_, R>

impl<R: AsyncRead + ?Sized + Unpin> Future for ReadVectored<'_, R> type Output = Result<usize>;
 where
    Self: Unpin, [src]

This is supported on crate feature io only.

Creates a future which will read from the AsyncRead into bufs using vectored IO operations. Read more

fn read_exact<'a>(&'a mut self, buf: &'a mut [u8]) -> ReadExact<'a, Self>ⓘ

Notable traits for ReadExact<'_, R>

impl<R: AsyncRead + ?Sized + Unpin> Future for ReadExact<'_, R> type Output = Result<()>;
 where
    Self: Unpin, [src]

This is supported on crate feature io only.

Creates a future which will read exactly enough bytes to fill buf, returning an error if end of file (EOF) is hit sooner. Read more

fn read_to_end<'a>(&'a mut self, buf: &'a mut Vec<u8>) -> ReadToEnd<'a, Self>ⓘ

Notable traits for ReadToEnd<'_, A>

impl<A: ?Sized> Future for ReadToEnd<'_, A> where
    A: AsyncRead + Unpin,  type Output = Result<usize>;
 where
    Self: Unpin, [src]

This is supported on crate feature io only.

Creates a future which will read all the bytes from this AsyncRead. Read more

fn read_to_string<'a>(
    &'a mut self,
    buf: &'a mut String
) -> ReadToString<'a, Self>ⓘ

Notable traits for ReadToString<'_, A>

impl<A: ?Sized> Future for ReadToString<'_, A> where
    A: AsyncRead + Unpin,  type Output = Result<usize>;
 where
    Self: Unpin, [src]

This is supported on crate feature io only.

Creates a future which will read all the bytes from this AsyncRead. Read more

fn split(self) -> (ReadHalf<Self>, WriteHalf<Self>) where
    Self: AsyncWrite + Sized, [src]

This is supported on crate feature io only.

Helper method for splitting this read/write object into two halves. Read more

fn take(self, limit: u64) -> Take<Self> where
    Self: Sized, [src]

This is supported on crate feature io only.

Creates an AsyncRead adapter which will read at most limit bytes from the underlying reader. Read more

fn compat(self) -> Compat<Self>ⓘ

Notable traits for Compat<R>

impl<R: AsyncRead03 + Unpin> Read for Compat<R>impl<W: AsyncWrite03 + Unpin> Write for Compat<W>
 where
    Self: Sized + Unpin, [src]

This is supported on crate features io and io-compat only.

Wraps an AsyncRead in a compatibility wrapper that allows it to be used as a futures 0.1 / tokio-io 0.1 AsyncRead. If the wrapped type implements AsyncWrite as well, the result will also implement the futures 0.1 / tokio 0.1 AsyncWrite trait. Read more

impl<T> Borrow<T> for T where
    T: ?Sized, [src]

pub fn borrow(&self) -> &T[src]

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T where
    T: ?Sized, [src]

pub fn borrow_mut(&mut self) -> &mut T[src]

Mutably borrows from an owned value. Read more

impl<T> From<T> for T[src]

pub fn from(t: T) -> T[src]

Performs the conversion.

impl<T, U> Into<U> for T where
    U: From<T>, [src]

pub fn into(self) -> U[src]

Performs the conversion.

impl<T, U> TryFrom<U> for T where
    U: Into<T>, [src]

type Error = Infallible

The type returned in the event of a conversion error.

pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]

Performs the conversion.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, [src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]

Performs the conversion.