Struct tokio::io::Lines

source ·
pub struct Lines<R> { /* private fields */ }
Expand description

Reads lines from an AsyncBufRead.

A Lines can be turned into a Stream with LinesStream.

This type is usually created using the lines method.

Implementations§

Returns the next line in the stream.

Cancel safety

This method is cancellation safe.

Examples
use tokio::io::AsyncBufReadExt;

let mut lines = my_buf_read.lines();

while let Some(line) = lines.next_line().await? {
    println!("length = {}", line.len())
}

Obtains a mutable reference to the underlying reader.

Obtains a reference to the underlying reader.

Unwraps this Lines<R>, returning the underlying reader.

Note that any leftover data in the internal buffer is lost. Therefore, a following read from the underlying reader may lead to data loss.

Polls for the next line in the stream.

This method returns:

  • Poll::Pending if the next line is not yet available.
  • Poll::Ready(Ok(Some(line))) if the next line is available.
  • Poll::Ready(Ok(None)) if there are no more lines in this stream.
  • Poll::Ready(Err(err)) if an IO error occurred while reading the next line.

When the method returns Poll::Pending, the Waker in the provided Context is scheduled to receive a wakeup when more bytes become available on the underlying IO resource. Note that on multiple calls to poll_next_line, only the Waker from the Context passed to the most recent call is scheduled to receive a wakeup.

Trait Implementations§

Formats the value using the given formatter. Read more

Auto Trait Implementations§

Blanket Implementations§

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

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

The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.