Struct futures_util::stream::Unfold

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

Expand description

Stream for the unfold function.

Trait Implementations

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

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

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fn is_terminated(&self) -> bool

Returns true if the stream should no longer be polled.

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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.

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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

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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, 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

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

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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,

const: unstable · source

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,

const: unstable · source

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

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into for T where
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.

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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.

const: unstable · source

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.

const: unstable · source

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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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 T where
T: 'static + ?Sized,

fn type_id(&self) -> TypeId

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

fn borrow(&self) -> &T

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

fn into(self) -> U

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

type Error = Infallible

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

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

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 T where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

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

fn borrow(&self) -> &T

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

fn into(self) -> U

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

type Error = Infallible

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

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

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 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,

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