Struct futures_util::stream::Unfold

source · [−]

pub struct Unfold<T, F, Fut> { /* private fields */ }

Expand description

Stream for the unfold function.

Trait Implementations

source

impl<T, F, Fut> Debug for Unfold<T, F, Fut>where
T: Debug,
Fut: Debug,

source

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

Formats the value using the given formatter. Read more

source

impl<T, F, Fut, Item> FusedStream for Unfold<T, F, Fut>where
F: FnMut(T) -> Fut,
Fut: Future<Output = Option<(Item, T)>>,

source

fn is_terminated(&self) -> bool

Returns true if the stream should no longer be polled.

source

impl<T, F, Fut, Item> Stream for Unfold<T, F, Fut>where
F: FnMut(T) -> Fut,
Fut: Future<Output = Option<(Item, T)>>,

type Item = Item

Values yielded by the stream.

source

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

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

source

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

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

source

impl<'pin, T, F, Fut> Unpin for Unfold<T, F, Fut>where
Origin<'__pin, T, F, Fut>: Unpin,

Auto Trait Implementations

impl<T, F, Fut> RefUnwindSafe for Unfold<T, F, Fut>where
 F: RefUnwindSafe,
 Fut: RefUnwindSafe,
 T: RefUnwindSafe,

impl<T, F, Fut> Send for Unfold<T, F, Fut>where
 F: Send,
 Fut: Send,
 T: Send,

impl<T, F, Fut> Sync for Unfold<T, F, Fut>where
 F: Sync,
 Fut: Sync,
 T: Sync,

impl<T, F, Fut> UnwindSafe for Unfold<T, F, Fut>where
 F: UnwindSafe,
 Fut: UnwindSafe,
 T: UnwindSafe,

Blanket Implementations

source

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

source

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

source

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

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

source

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

const: unstable · source

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

Mutably borrows from an owned value. Read more

source

impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

source

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

const: unstable · source

fn into(self) -> U

Calls U::from(self).

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

source

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

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

source

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

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

source

impl<S, T, E> TryStream for Swhere
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

source

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 futures_util::stream::Unfold

Trait Implementations

impl<T, F, Fut> Debug for Unfold<T, F, Fut>where
T: Debug,
Fut: Debug,

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

impl<T, F, Fut, Item> FusedStream for Unfold<T, F, Fut>where
F: FnMut(T) -> Fut,
Fut: Future<Output = Option<(Item, T)>>,

fn is_terminated(&self) -> bool

impl<T, F, Fut, Item> Stream for Unfold<T, F, Fut>where
F: FnMut(T) -> Fut,
Fut: Future<Output = Option<(Item, T)>>,

type Item = Item

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

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

impl<'pin, T, F, Fut> Unpin for Unfold<T, F, Fut>where
Origin<'__pin, T, F, Fut>: Unpin,

Auto Trait Implementations

impl<T, F, Fut> RefUnwindSafe for Unfold<T, F, Fut>where
    F: RefUnwindSafe,
    Fut: RefUnwindSafe,
    T: RefUnwindSafe,

impl<T, F, Fut> Send for Unfold<T, F, Fut>where
    F: Send,
    Fut: Send,
    T: Send,

impl<T, F, Fut> Sync for Unfold<T, F, Fut>where
    F: Sync,
    Fut: Sync,
    T: Sync,

impl<T, F, Fut> UnwindSafe for Unfold<T, F, Fut>where
    F: UnwindSafe,
    Fut: UnwindSafe,
    T: UnwindSafe,

Blanket Implementations

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

fn type_id(&self) -> TypeId

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

fn borrow(&self) -> &T

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

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

impl<T> From<T> for T

fn from(t: T) -> T

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

fn into(self) -> U

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

type Error = Infallible

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

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

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

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

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

type Ok = T

type Error = E

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

Struct futures_util::stream::Unfold

Trait Implementations

impl<T, F, Fut> Debug for Unfold<T, F, Fut>where T: Debug, Fut: Debug,

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

impl<T, F, Fut, Item> FusedStream for Unfold<T, F, Fut>where F: FnMut(T) -> Fut, Fut: Future<Output = Option<(Item, T)>>,

fn is_terminated(&self) -> bool

impl<T, F, Fut, Item> Stream for Unfold<T, F, Fut>where F: FnMut(T) -> Fut, Fut: Future<Output = Option<(Item, T)>>,

type Item = Item

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

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

impl<'__pin, T, F, Fut> Unpin for Unfold<T, F, Fut>where __Origin<'__pin, T, F, Fut>: Unpin,

Auto Trait Implementations

impl<T, F, Fut> RefUnwindSafe for Unfold<T, F, Fut>where F: RefUnwindSafe, Fut: RefUnwindSafe, T: RefUnwindSafe,

impl<T, F, Fut> Send for Unfold<T, F, Fut>where F: Send, Fut: Send, T: Send,

impl<T, F, Fut> Sync for Unfold<T, F, Fut>where F: Sync, Fut: Sync, T: Sync,

impl<T, F, Fut> UnwindSafe for Unfold<T, F, Fut>where F: UnwindSafe, Fut: UnwindSafe, T: UnwindSafe,

Blanket Implementations

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

fn type_id(&self) -> TypeId

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

fn borrow(&self) -> &T

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

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

impl<T> From<T> for T

fn from(t: T) -> T

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

fn into(self) -> U

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

type Error = Infallible

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

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

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

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

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

type Ok = T

type Error = E

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

impl<T, F, Fut> Debug for Unfold<T, F, Fut>where
T: Debug,
Fut: Debug,

impl<T, F, Fut, Item> FusedStream for Unfold<T, F, Fut>where
F: FnMut(T) -> Fut,
Fut: Future<Output = Option<(Item, T)>>,

impl<T, F, Fut, Item> Stream for Unfold<T, F, Fut>where
F: FnMut(T) -> Fut,
Fut: Future<Output = Option<(Item, T)>>,

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

impl<'pin, T, F, Fut> Unpin for Unfold<T, F, Fut>where
Origin<'__pin, T, F, Fut>: Unpin,

impl<T, F, Fut> RefUnwindSafe for Unfold<T, F, Fut>where
F: RefUnwindSafe,
Fut: RefUnwindSafe,
T: RefUnwindSafe,

impl<T, F, Fut> Send for Unfold<T, F, Fut>where
F: Send,
Fut: Send,
T: Send,

impl<T, F, Fut> Sync for Unfold<T, F, Fut>where
F: Sync,
Fut: Sync,
T: Sync,

impl<T, F, Fut> UnwindSafe for Unfold<T, F, Fut>where
F: UnwindSafe,
Fut: UnwindSafe,
T: UnwindSafe,

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

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

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

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

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

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

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

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