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Empty

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tokio::io

结构体 Empty 

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pub struct Empty { /* private fields */ }
展开描述

Empty 忽略通过 AsyncWrite 写入的任何数据， 并且 在通过 AsyncRead 读取时始终为空 （返回零字节）。

此结构体 通常通过调用 empty 创建。 有关更多详细信息， 请参阅 empty() 的文档。

这是 std::io::empty 的异步版本。

Trait 实现§

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impl AsyncBufRead for Empty

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

Attempts to return the contents of the internal buffer, filling it with more data from the inner reader if it is empty. 更多信息
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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. 更多信息
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impl AsyncRead for Empty

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fn poll_read( self: Pin<&mut Self>, cx: &mut Context<'_>, _: &mut ReadBuf<'_>, ) -> Poll<Result<()>>

Attempts to read from the AsyncRead into buf. 更多信息
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impl AsyncSeek for Empty

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fn start_seek(self: Pin<&mut Self>, _position: SeekFrom) -> Result<()>

Attempts to seek to an offset, in bytes, in a stream. 更多信息
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fn poll_complete( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Result<u64>>

Waits for a seek operation to complete. 更多信息
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impl AsyncWrite for Empty

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

Attempt to write bytes from buf into the object. 更多信息
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fn poll_flush( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Result<(), Error>>

Attempts to flush the object, ensuring that any buffered data reach their destination. 更多信息
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fn poll_shutdown( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Result<(), Error>>

Initiates or attempts to shut down this writer, returning success when the I/O connection has completely shut down. 更多信息
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fn is_write_vectored(&self) -> bool

Determines if this writer has an efficient poll_write_vectored implementation. 更多信息
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fn poll_write_vectored( self: Pin<&mut Self>, cx: &mut Context<'_>, bufs: &[IoSlice<'_>], ) -> Poll<Result<usize, Error>>

Like poll_write, except that it writes from a slice of buffers. 更多信息
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impl Debug for Empty

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

使用给定的格式化器格式化此值。 更多信息

自动 Trait 实现§

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impl Freeze for Empty

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impl RefUnwindSafe for Empty

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impl Send for Empty

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impl Sync for Empty

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impl Unpin for Empty

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impl UnsafeUnpin for Empty

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impl UnwindSafe for Empty

Blanket 实现§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. 更多信息
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impl<R> AsyncBufReadExt for R
where R: AsyncBufRead + ?Sized,

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

Reads all bytes into buf until the delimiter byte or EOF is reached. 更多信息
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fn read_line<'a>(&'a mut self, buf: &'a mut String) -> ReadLine<'a, Self>
where Self: Unpin,

Reads all bytes until a newline (the 0xA byte) is reached, and append them to the provided buffer. 更多信息
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fn split(self, byte: u8) -> Split<Self>
where Self: Sized + Unpin,

Returns a stream of the contents of this reader split on the byte byte. 更多信息
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fn fill_buf(&mut self) -> FillBuf<'_, Self>
where Self: Unpin,

Returns the contents of the internal buffer, filling it with more data from the inner reader if it is empty. 更多信息
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fn consume(&mut self, amt: usize)
where Self: Unpin,

Tells this buffer that amt bytes have been consumed from the buffer, so they should no longer be returned in calls to read. 更多信息
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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. 更多信息
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impl<R> AsyncReadExt for R
where R: AsyncRead + ?Sized,

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

Creates a new AsyncRead instance that chains this stream with next. 更多信息
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fn read<'a>(&'a mut self, buf: &'a mut [u8]) -> Read<'a, Self>
where Self: Unpin,

Pulls some bytes from this source into the specified buffer, returning how many bytes were read. 更多信息
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fn read_buf<'a, B>(&'a mut self, buf: &'a mut B) -> ReadBuf<'a, Self, B>
where Self: Unpin, B: BufMut + ?Sized,

Pulls some bytes from this source into the specified buffer, advancing the buffer’s internal cursor. 更多信息
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fn read_exact<'a>(&'a mut self, buf: &'a mut [u8]) -> ReadExact<'a, Self>
where Self: Unpin,

Reads the exact number of bytes required to fill buf. 更多信息
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fn read_u8(&mut self) -> ReadU8<&mut Self>
where Self: Unpin,

Reads an unsigned 8 bit integer from the underlying reader. 更多信息
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fn read_i8(&mut self) -> ReadI8<&mut Self>
where Self: Unpin,

Reads a signed 8 bit integer from the underlying reader. 更多信息
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fn read_u16(&mut self) -> ReadU16<&mut Self>
where Self: Unpin,

Reads an unsigned 16-bit integer in big-endian order from the underlying reader. 更多信息
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fn read_i16(&mut self) -> ReadI16<&mut Self>
where Self: Unpin,

Reads a signed 16-bit integer in big-endian order from the underlying reader. 更多信息
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fn read_u32(&mut self) -> ReadU32<&mut Self>
where Self: Unpin,

Reads an unsigned 32-bit integer in big-endian order from the underlying reader. 更多信息
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fn read_i32(&mut self) -> ReadI32<&mut Self>
where Self: Unpin,

Reads a signed 32-bit integer in big-endian order from the underlying reader. 更多信息
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fn read_u64(&mut self) -> ReadU64<&mut Self>
where Self: Unpin,

Reads an unsigned 64-bit integer in big-endian order from the underlying reader. 更多信息
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fn read_i64(&mut self) -> ReadI64<&mut Self>
where Self: Unpin,

Reads an signed 64-bit integer in big-endian order from the underlying reader. 更多信息
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fn read_u128(&mut self) -> ReadU128<&mut Self>
where Self: Unpin,

Reads an unsigned 128-bit integer in big-endian order from the underlying reader. 更多信息
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fn read_i128(&mut self) -> ReadI128<&mut Self>
where Self: Unpin,

Reads an signed 128-bit integer in big-endian order from the underlying reader. 更多信息
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fn read_f32(&mut self) -> ReadF32<&mut Self>
where Self: Unpin,

Reads an 32-bit floating point type in big-endian order from the underlying reader. 更多信息
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fn read_f64(&mut self) -> ReadF64<&mut Self>
where Self: Unpin,

Reads an 64-bit floating point type in big-endian order from the underlying reader. 更多信息
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fn read_u16_le(&mut self) -> ReadU16Le<&mut Self>
where Self: Unpin,

Reads an unsigned 16-bit integer in little-endian order from the underlying reader. 更多信息
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fn read_i16_le(&mut self) -> ReadI16Le<&mut Self>
where Self: Unpin,

Reads a signed 16-bit integer in little-endian order from the underlying reader. 更多信息
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fn read_u32_le(&mut self) -> ReadU32Le<&mut Self>
where Self: Unpin,

Reads an unsigned 32-bit integer in little-endian order from the underlying reader. 更多信息
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fn read_i32_le(&mut self) -> ReadI32Le<&mut Self>
where Self: Unpin,

Reads a signed 32-bit integer in little-endian order from the underlying reader. 更多信息
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fn read_u64_le(&mut self) -> ReadU64Le<&mut Self>
where Self: Unpin,

Reads an unsigned 64-bit integer in little-endian order from the underlying reader. 更多信息
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fn read_i64_le(&mut self) -> ReadI64Le<&mut Self>
where Self: Unpin,

Reads an signed 64-bit integer in little-endian order from the underlying reader. 更多信息
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fn read_u128_le(&mut self) -> ReadU128Le<&mut Self>
where Self: Unpin,

Reads an unsigned 128-bit integer in little-endian order from the underlying reader. 更多信息
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fn read_i128_le(&mut self) -> ReadI128Le<&mut Self>
where Self: Unpin,

Reads an signed 128-bit integer in little-endian order from the underlying reader. 更多信息
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fn read_f32_le(&mut self) -> ReadF32Le<&mut Self>
where Self: Unpin,

Reads an 32-bit floating point type in little-endian order from the underlying reader. 更多信息
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fn read_f64_le(&mut self) -> ReadF64Le<&mut Self>
where Self: Unpin,

Reads an 64-bit floating point type in little-endian order from the underlying reader. 更多信息
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fn read_to_end<'a>(&'a mut self, buf: &'a mut Vec<u8>) -> ReadToEnd<'a, Self>
where Self: Unpin,

Reads all bytes until EOF in this source, placing them into buf. 更多信息
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fn read_to_string<'a>( &'a mut self, dst: &'a mut String, ) -> ReadToString<'a, Self>
where Self: Unpin,

Reads all bytes until EOF in this source, appending them to buf. 更多信息
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fn take(self, limit: u64) -> Take<Self>
where Self: Sized,

Creates an adaptor which reads at most limit bytes from it. 更多信息
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impl<S> AsyncSeekExt for S
where S: AsyncSeek + ?Sized,

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fn seek(&mut self, pos: SeekFrom) -> Seek<'_, Self>
where Self: Unpin,

Creates a future which will seek an IO object, and then yield the new position in the object and the object itself. 更多信息
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fn rewind(&mut self) -> Seek<'_, Self>
where Self: Unpin,

Creates a future which will rewind to the beginning of the stream. 更多信息
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fn stream_position(&mut self) -> Seek<'_, Self>
where Self: Unpin,

Creates a future which will return the current seek position from the start of the stream. 更多信息
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impl<W> AsyncWriteExt for W
where W: AsyncWrite + ?Sized,

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fn write<'a>(&'a mut self, src: &'a [u8]) -> Write<'a, Self>
where Self: Unpin,

Writes a buffer into this writer, returning how many bytes were written. 更多信息
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fn write_vectored<'a, 'b>( &'a mut self, bufs: &'a [IoSlice<'b>], ) -> WriteVectored<'a, 'b, Self>
where Self: Unpin,

Like write, except that it writes from a slice of buffers. 更多信息
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fn write_buf<'a, B>(&'a mut self, src: &'a mut B) -> WriteBuf<'a, Self, B>
where Self: Sized + Unpin, B: Buf,

Writes a buffer into this writer, advancing the buffer’s internal cursor. 更多信息
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fn write_all_buf<'a, B>( &'a mut self, src: &'a mut B, ) -> WriteAllBuf<'a, Self, B>
where Self: Sized + Unpin, B: Buf,

Attempts to write an entire buffer into this writer. 更多信息
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fn write_all<'a>(&'a mut self, src: &'a [u8]) -> WriteAll<'a, Self>
where Self: Unpin,

Attempts to write an entire buffer into this writer. 更多信息
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fn write_u8(&mut self, n: u8) -> WriteU8<&mut Self>
where Self: Unpin,

Writes an unsigned 8-bit integer to the underlying writer. 更多信息
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fn write_i8(&mut self, n: i8) -> WriteI8<&mut Self>
where Self: Unpin,

Writes a signed 8-bit integer to the underlying writer. 更多信息
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fn write_u16(&mut self, n: u16) -> WriteU16<&mut Self>
where Self: Unpin,

Writes an unsigned 16-bit integer in big-endian order to the underlying writer. 更多信息
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fn write_i16(&mut self, n: i16) -> WriteI16<&mut Self>
where Self: Unpin,

Writes a signed 16-bit integer in big-endian order to the underlying writer. 更多信息
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fn write_u32(&mut self, n: u32) -> WriteU32<&mut Self>
where Self: Unpin,

Writes an unsigned 32-bit integer in big-endian order to the underlying writer. 更多信息
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fn write_i32(&mut self, n: i32) -> WriteI32<&mut Self>
where Self: Unpin,

Writes a signed 32-bit integer in big-endian order to the underlying writer. 更多信息
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fn write_u64(&mut self, n: u64) -> WriteU64<&mut Self>
where Self: Unpin,

Writes an unsigned 64-bit integer in big-endian order to the underlying writer. 更多信息
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fn write_i64(&mut self, n: i64) -> WriteI64<&mut Self>
where Self: Unpin,

Writes an signed 64-bit integer in big-endian order to the underlying writer. 更多信息
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fn write_u128(&mut self, n: u128) -> WriteU128<&mut Self>
where Self: Unpin,

Writes an unsigned 128-bit integer in big-endian order to the underlying writer. 更多信息
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fn write_i128(&mut self, n: i128) -> WriteI128<&mut Self>
where Self: Unpin,

Writes an signed 128-bit integer in big-endian order to the underlying writer. 更多信息
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fn write_f32(&mut self, n: f32) -> WriteF32<&mut Self>
where Self: Unpin,

Writes an 32-bit floating point type in big-endian order to the underlying writer. 更多信息
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fn write_f64(&mut self, n: f64) -> WriteF64<&mut Self>
where Self: Unpin,

Writes an 64-bit floating point type in big-endian order to the underlying writer. 更多信息
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fn write_u16_le(&mut self, n: u16) -> WriteU16Le<&mut Self>
where Self: Unpin,

Writes an unsigned 16-bit integer in little-endian order to the underlying writer. 更多信息
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fn write_i16_le(&mut self, n: i16) -> WriteI16Le<&mut Self>
where Self: Unpin,

Writes a signed 16-bit integer in little-endian order to the underlying writer. 更多信息
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fn write_u32_le(&mut self, n: u32) -> WriteU32Le<&mut Self>
where Self: Unpin,

Writes an unsigned 32-bit integer in little-endian order to the underlying writer. 更多信息
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fn write_i32_le(&mut self, n: i32) -> WriteI32Le<&mut Self>
where Self: Unpin,

Writes a signed 32-bit integer in little-endian order to the underlying writer. 更多信息
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fn write_u64_le(&mut self, n: u64) -> WriteU64Le<&mut Self>
where Self: Unpin,

Writes an unsigned 64-bit integer in little-endian order to the underlying writer. 更多信息
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fn write_i64_le(&mut self, n: i64) -> WriteI64Le<&mut Self>
where Self: Unpin,

Writes an signed 64-bit integer in little-endian order to the underlying writer. 更多信息
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fn write_u128_le(&mut self, n: u128) -> WriteU128Le<&mut Self>
where Self: Unpin,

Writes an unsigned 128-bit integer in little-endian order to the underlying writer. 更多信息
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fn write_i128_le(&mut self, n: i128) -> WriteI128Le<&mut Self>
where Self: Unpin,

Writes an signed 128-bit integer in little-endian order to the underlying writer. 更多信息
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fn write_f32_le(&mut self, n: f32) -> WriteF32Le<&mut Self>
where Self: Unpin,

Writes an 32-bit floating point type in little-endian order to the underlying writer. 更多信息
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fn write_f64_le(&mut self, n: f64) -> WriteF64Le<&mut Self>
where Self: Unpin,

Writes an 64-bit floating point type in little-endian order to the underlying writer. 更多信息
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fn flush(&mut self) -> Flush<'_, Self>
where Self: Unpin,

Flushes this output stream, ensuring that all intermediately buffered contents reach their destination. 更多信息
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fn shutdown(&mut self) -> Shutdown<'_, Self>
where Self: Unpin,

Shuts down the output stream, ensuring that the value can be dropped cleanly. 更多信息
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. 更多信息
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. 更多信息
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impl<T> From<T> for T

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fn from(t: T) -> T

原样返回传入的参数。

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

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fn into(self) -> U

调用 U::from(self)。

也就是说，此转换的具体行为取决于 From<T> for U 的实现方式。

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

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type Error = Infallible

转换出错时返回的类型。
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

执行转换。
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

转换出错时返回的类型。
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

执行转换。