Trait AsyncRead 

pub trait AsyncRead {
    // Required method
    fn poll_read(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &mut [u8],
    ) -> Poll<Result<usize>>;
}

Reads bytes from a source.

Required Methods

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

Attempt to read from the source into buf.

Generally, an implementation will perform a copy.

On success, it returns Ok(num_bytes_read), that is the length of bytes written into buf.

It returns 0 if and only if:

• buf is empty; or
• The source reached its end (the stream is exhausted / EOF).

An implementation SHOULD only generates the following errors:

• std::io::ErrorKind::ConnectionReset if the read operation was explicitly truncated by the source.
• std::io::ErrorKind::NotConnected if the read operation aborted at any point because lack of communication with the source.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl AsyncRead for &[u8]

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

Implementors