Struct async_std::stream::Scan[−][src]

pub struct Scan<S, St, F> { /* fields omitted */ }

Expand description

A stream to maintain state while polling another stream.

This struct is created by the scan method on Stream. See its documentation for more.

Trait Implementations

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impl<S: Debug, St: Debug, F: Debug> Debug for Scan<S, St, F>

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

Formats the value using the given formatter. Read more

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impl<S, St, F, B> Stream for Scan<S, St, F> where
S: Stream,
F: FnMut(&mut St, S::Item) -> Option,

type Item = B

Values yielded by the stream.

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

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

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

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

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impl<'pin, S, St, F> Unpin for Scan<S, St, F> where
Origin<'__pin, S, St, F>: Unpin,

Auto Trait Implementations

impl<S, St, F> RefUnwindSafe for Scan<S, St, F> where
 F: RefUnwindSafe,
 S: RefUnwindSafe,
 St: RefUnwindSafe,

impl<S, St, F> Send for Scan<S, St, F> where
 F: Send,
 S: Send,
 St: Send,

impl<S, St, F> Sync for Scan<S, St, F> where
 F: Sync,
 S: Sync,
 St: Sync,

impl<S, St, F> UnwindSafe for Scan<S, St, F> where
 F: UnwindSafe,
 S: UnwindSafe,
 St: UnwindSafe,

Blanket Implementations

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

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pub fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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

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pub fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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

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

Mutably borrows from an owned value. Read more

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impl<T> From<T> for T

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pub fn from(t: T) -> T

Performs the conversion.

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

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pub fn into(self) -> U

Performs the conversion.

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

type Error = Infallible

The type returned in the event of a conversion error.

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

Performs the conversion.

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

type Error = >::Error

The type returned in the event of a conversion error.

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

Performs the conversion.

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

type Ok = T

The type of successful values yielded by this future

type Error = E

The type of failures yielded by this future

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

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

Struct async_std::stream::Scan[−][src]

Trait Implementations

impl<S: Debug, St: Debug, F: Debug> Debug for Scan<S, St, F>

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

impl<S, St, F, B> Stream for Scan<S, St, F> where
S: Stream,
F: FnMut(&mut St, S::Item) -> Option<B>,

type Item = B

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

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

impl<'pin, S, St, F> Unpin for Scan<S, St, F> where
Origin<'__pin, S, St, F>: Unpin,

Auto Trait Implementations

impl<S, St, F> RefUnwindSafe for Scan<S, St, F> where
    F: RefUnwindSafe,
    S: RefUnwindSafe,
    St: RefUnwindSafe,

impl<S, St, F> Send for Scan<S, St, F> where
    F: Send,
    S: Send,
    St: Send,

impl<S, St, F> Sync for Scan<S, St, F> where
    F: Sync,
    S: Sync,
    St: Sync,

impl<S, St, F> UnwindSafe for Scan<S, St, F> where
    F: UnwindSafe,
    S: UnwindSafe,
    St: UnwindSafe,

Blanket Implementations

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

pub fn type_id(&self) -> TypeId

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

pub fn borrow(&self) -> &T

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

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

impl<T> From<T> for T

pub fn from(t: T) -> T

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

pub fn into(self) -> U

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

type Error = Infallible

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

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

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

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

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

type Ok = T

type Error = E

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

Struct async_std::stream::Scan[−][src]

Trait Implementations

impl<S: Debug, St: Debug, F: Debug> Debug for Scan<S, St, F>

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

impl<S, St, F, B> Stream for Scan<S, St, F> where S: Stream, F: FnMut(&mut St, S::Item) -> Option<B>,

type Item = B

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

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

impl<'__pin, S, St, F> Unpin for Scan<S, St, F> where __Origin<'__pin, S, St, F>: Unpin,

Auto Trait Implementations

impl<S, St, F> RefUnwindSafe for Scan<S, St, F> where F: RefUnwindSafe, S: RefUnwindSafe, St: RefUnwindSafe,

impl<S, St, F> Send for Scan<S, St, F> where F: Send, S: Send, St: Send,

impl<S, St, F> Sync for Scan<S, St, F> where F: Sync, S: Sync, St: Sync,

impl<S, St, F> UnwindSafe for Scan<S, St, F> where F: UnwindSafe, S: UnwindSafe, St: UnwindSafe,

Blanket Implementations

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

pub fn type_id(&self) -> TypeId

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

pub fn borrow(&self) -> &T

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

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

impl<T> From<T> for T

pub fn from(t: T) -> T

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

pub fn into(self) -> U

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

type Error = Infallible

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

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

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

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

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

type Ok = T

type Error = E

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

impl<S, St, F, B> Stream for Scan<S, St, F> where
S: Stream,
F: FnMut(&mut St, S::Item) -> Option<B>,

impl<'pin, S, St, F> Unpin for Scan<S, St, F> where
Origin<'__pin, S, St, F>: Unpin,

impl<S, St, F> RefUnwindSafe for Scan<S, St, F> where
F: RefUnwindSafe,
S: RefUnwindSafe,
St: RefUnwindSafe,

impl<S, St, F> Send for Scan<S, St, F> where
F: Send,
S: Send,
St: Send,

impl<S, St, F> Sync for Scan<S, St, F> where
F: Sync,
S: Sync,
St: Sync,

impl<S, St, F> UnwindSafe for Scan<S, St, F> where
F: UnwindSafe,
S: UnwindSafe,
St: UnwindSafe,

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

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

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

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

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

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

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

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