Struct futures_util::io::Empty

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pub struct Empty { /* private fields */ }

Expand description

Reader for the empty() function.

Trait Implementations

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impl AsyncBufRead for Empty

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

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

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

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

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impl AsyncRead for Empty

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

Attempt to read from the AsyncRead into buf. Read more

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

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

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impl Debug for Empty

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

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 Twhere
T: 'static + ?Sized,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<R> AsyncBufReadExt for Rwhere
R: AsyncBufRead + ?Sized,

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fn fill_buf(&mut self) -> FillBuf<'_, Self>ⓘNotable traits for FillBuf<'a, R>`impl<'a, R> Future for FillBuf<'a, R>where R: AsyncBufRead + ?Sized + Unpin, type Output = Result<&'a [u8]>;`where
Self: Unpin,

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

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

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

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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,

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

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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,

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

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

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

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impl<R> AsyncReadExt for Rwhere
R: AsyncRead + ?Sized,

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

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

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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,

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

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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,

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

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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,

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

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fn read_to_end<'a>(&'a mut self, buf: &'a mut Vec<u8>) -> ReadToEnd<'a, Self>ⓘNotable traits for ReadToEnd<'_, A>`impl<A> Future for ReadToEnd<'_, A>where A: AsyncRead + ?Sized + Unpin, type Output = Result<usize>;`where
Self: Unpin,

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

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fn read_to_string<'a>(
 &'a mut self,
 buf: &'a mut String
) -> ReadToString<'a, Self>ⓘNotable traits for ReadToString<'_, A>`impl<A> Future for ReadToString<'_, A>where A: AsyncRead + ?Sized + Unpin, type Output = Result<usize>;`where
 Self: Unpin,

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

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

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

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

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

impl<T> Borrow<T> for Twhere
T: ?Sized,

const: unstable

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for Twhere
T: ?Sized,

const: unstable

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

impl<T> From<T> for T

const: unstable

fn from(t: T) -> T

Returns the argument unchanged.

impl<T, U> Into for Twhere
U: From<T>,

const: unstable

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of [From]<T> for U chooses to do.

impl<T, U> TryFrom for Twhere
U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable

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

Performs the conversion.

impl<T, U> TryInto for Twhere
U: TryFrom<T>,

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable

fn try_into(self) -> Result<U, >::Error>

Performs the conversion.

Struct futures_util::io::Empty

Trait Implementations

impl AsyncBufRead for Empty

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

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

impl AsyncRead for Empty

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

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

impl Debug for Empty

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

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 Twhere T: 'static + ?Sized,

fn type_id(&self) -> TypeId

impl<R> AsyncBufReadExt for Rwhere R: AsyncBufRead + ?Sized,

fn fill_buf(&mut self) -> FillBuf<'_, Self>ⓘNotable traits for FillBuf<'a, R>impl<'a, R> Future for FillBuf<'a, R>where R: AsyncBufRead + ?Sized + Unpin, type Output = Result<&'a [u8]>;where Self: Unpin,

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

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,

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,

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

impl<R> AsyncReadExt for Rwhere R: AsyncRead + ?Sized,

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

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,

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,

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,

fn read_to_end<'a>(&'a mut self, buf: &'a mut Vec<u8>) -> ReadToEnd<'a, Self>ⓘNotable traits for ReadToEnd<'_, A>impl<A> Future for ReadToEnd<'_, A>where A: AsyncRead + ?Sized + Unpin, type Output = Result<usize>;where Self: Unpin,

fn read_to_string<'a>( &'a mut self, buf: &'a mut String) -> ReadToString<'a, Self>ⓘNotable traits for ReadToString<'_, A>impl<A> Future for ReadToString<'_, A>where A: AsyncRead + ?Sized + Unpin, type Output = Result<usize>;where Self: Unpin,

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

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

impl<T> Borrow<T> for Twhere T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for Twhere T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

impl<T> From<T> for T

fn from(t: T) -> T

impl<T, U> Into<U> for Twhere U: From<T>,

fn into(self) -> U

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

type Error = Infallible

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

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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

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

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

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

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

impl<T> Any for Twhere
T: 'static + ?Sized,

impl<R> AsyncBufReadExt for Rwhere
R: AsyncBufRead + ?Sized,

fn fill_buf(&mut self) -> FillBuf<'_, Self>ⓘNotable traits for FillBuf<'a, R>`impl<'a, R> Future for FillBuf<'a, R>where R: AsyncBufRead + ?Sized + Unpin, type Output = Result<&'a [u8]>;`where
Self: Unpin,

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

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,

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,

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

impl<R> AsyncReadExt for Rwhere
R: AsyncRead + ?Sized,

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

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,

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,

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,

fn read_to_end<'a>(&'a mut self, buf: &'a mut Vec<u8>) -> ReadToEnd<'a, Self>ⓘNotable traits for ReadToEnd<'_, A>`impl<A> Future for ReadToEnd<'_, A>where A: AsyncRead + ?Sized + Unpin, type Output = Result<usize>;`where
Self: Unpin,

fn read_to_string<'a>(
&'a mut self,
buf: &'a mut String
) -> ReadToString<'a, Self>ⓘNotable traits for ReadToString<'_, A>`impl<A> Future for ReadToString<'_, A>where A: AsyncRead + ?Sized + Unpin, type Output = Result<usize>;`where
Self: Unpin,

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

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

impl<T> Borrow<T> for Twhere
T: ?Sized,

impl<T> BorrowMut<T> for Twhere
T: ?Sized,

impl<T, U> Into<U> for Twhere
U: From<T>,

impl<T, U> TryFrom<U> for Twhere
U: Into<T>,

impl<T, U> TryInto<U> for Twhere
U: TryFrom<T>,