Struct tokio::io::Lines[−][src]

#[must_use = "streams do nothing unless polled"]
pub struct Lines<R> { /* fields omitted */ }
Expand description

Stream for the lines method.

Implementations

impl<R> Lines<R> where
    R: AsyncBufRead + Unpin, [src]

pub async fn next_line(&mut self) -> Result<Option<String>>[src]

Returns the next line in the stream.

Examples

use tokio::io::AsyncBufReadExt;

let mut lines = my_buf_read.lines();

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

Trait Implementations

impl<R: Debug> Debug for Lines<R>[src]

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

Formats the value using the given formatter. Read more

impl<R: AsyncBufRead> Stream for Lines<R>[src]

type Item = Result<String>

Values yielded by the stream.

fn poll_next(
    self: Pin<&mut Self>,
    cx: &mut Context<'_>
) -> Poll<Option<Self::Item>>[src]

Attempt to pull out the next value of this stream, registering the current task for wakeup if the value is not yet available, and returning None if the stream is exhausted. Read more

fn size_hint(&self) -> (usize, Option<usize>)[src]

Returns the bounds on the remaining length of the stream. Read more

impl<'__pin, R> Unpin for Lines<R> where
    __Origin<'__pin, R>: Unpin, [src]

Auto Trait Implementations

impl<R> RefUnwindSafe for Lines<R> where
    R: RefUnwindSafe, 

impl<R> Send for Lines<R> where
    R: Send, 

impl<R> Sync for Lines<R> where
    R: Sync, 

impl<R> UnwindSafe for Lines<R> where
    R: UnwindSafe, 

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<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<St> StreamExt for St where
    St: Stream + ?Sized, [src]

fn next(&mut self) -> Next<'_, Self> where
    Self: Unpin, [src]

Consumes and returns the next value in the stream or None if the stream is finished. Read more

fn try_next<T, E>(&mut self) -> TryNext<'_, Self> where
    Self: Stream<Item = Result<T, E>> + Unpin, [src]

Consumes and returns the next item in the stream. If an error is encountered before the next item, the error is returned instead. Read more

fn map<T, F>(self, f: F) -> Map<Self, F> where
    F: FnMut(Self::Item) -> T,
    Self: Sized, [src]

Maps this stream’s items to a different type, returning a new stream of the resulting type. Read more

fn merge<U>(self, other: U) -> Merge<Self, U> where
    U: Stream<Item = Self::Item>,
    Self: Sized, [src]

Combine two streams into one by interleaving the output of both as it is produced. Read more

fn filter<F>(self, f: F) -> Filter<Self, F> where
    F: FnMut(&Self::Item) -> bool,
    Self: Sized, [src]

Filters the values produced by this stream according to the provided predicate. Read more

fn filter_map<T, F>(self, f: F) -> FilterMap<Self, F> where
    F: FnMut(Self::Item) -> Option<T>,
    Self: Sized, [src]

Filters the values produced by this stream while simultaneously mapping them to a different type according to the provided closure. Read more

fn fuse(self) -> Fuse<Self> where
    Self: Sized, [src]

Creates a stream which ends after the first None. Read more

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

Creates a new stream of at most n items of the underlying stream. Read more

fn take_while<F>(self, f: F) -> TakeWhile<Self, F> where
    F: FnMut(&Self::Item) -> bool,
    Self: Sized, [src]

Take elements from this stream while the provided predicate resolves to true. Read more

fn all<F>(&mut self, f: F) -> AllFuture<'_, Self, F> where
    Self: Unpin,
    F: FnMut(Self::Item) -> bool, [src]

Tests if every element of the stream matches a predicate. Read more

fn any<F>(&mut self, f: F) -> AnyFuture<'_, Self, F> where
    Self: Unpin,
    F: FnMut(Self::Item) -> bool, [src]

Tests if any element of the stream matches a predicate. Read more

fn chain<U>(self, other: U) -> Chain<Self, U> where
    U: Stream<Item = Self::Item>,
    Self: Sized, [src]

Combine two streams into one by first returning all values from the first stream then all values from the second stream. Read more

fn fold<B, F>(self, init: B, f: F) -> FoldFuture<Self, B, F> where
    Self: Sized,
    F: FnMut(B, Self::Item) -> B, [src]

A combinator that applies a function to every element in a stream producing a single, final value. Read more

fn collect<T>(self) -> Collect<Self, T> where
    T: FromStream<Self::Item>,
    Self: Sized, [src]

Drain stream pushing all emitted values into a collection. Read more

fn timeout(self, duration: Duration) -> Timeout<Self> where
    Self: Sized, [src]

Applies a per-item timeout to the passed stream. Read more

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.

impl<S, T, E> TryStream for S where
    S: Stream<Item = Result<T, E>> + ?Sized, [src]

type Ok = T

The type of successful values yielded by this future

type Error = E

The type of failures yielded by this future

pub fn try_poll_next(
    self: Pin<&mut S>,
    cx: &mut Context<'_>
) -> Poll<Option<Result<<S as TryStream>::Ok, <S as TryStream>::Error>>>[src]

Poll this TryStream as if it were a Stream. Read more