Once

Struct Once 

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pub struct Once<B>(/* private fields */);
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Full body type that can only be polled once with Stream::poll_next.

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impl<B> Once<B>
where B: Buf + Unpin,

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pub const fn new(body: B) -> Self

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impl<B: Default> Default for Once<B>

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fn default() -> Once<B>

Returns the “default value” for a type. Read more
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impl<B> From<B> for Once<B>
where B: Buf + Unpin,

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fn from(b: B) -> Self

Converts to this type from the input type.
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impl<B> From<Once<B>> for ResponseBody
where B: Into<Bytes>,

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fn from(once: Once<B>) -> Self

Converts to this type from the input type.
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impl From<Once<Bytes>> for RequestBody

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fn from(once: Once<Bytes>) -> Self

Converts to this type from the input type.
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impl<B> Stream for Once<B>
where B: Buf + Unpin,

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type Item = Result<B, Infallible>

Values yielded by the stream.
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fn poll_next( self: Pin<&mut Self>, _: &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

Auto Trait Implementations§

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impl<B> Freeze for Once<B>
where B: Freeze,

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impl<B> RefUnwindSafe for Once<B>
where B: RefUnwindSafe,

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impl<B> Send for Once<B>
where B: Send,

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impl<B> Sync for Once<B>
where B: Sync,

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impl<B> Unpin for Once<B>
where B: Unpin,

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impl<B> UnwindSafe for Once<B>
where B: UnwindSafe,

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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,

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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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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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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

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

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type Ok = T

The type of successful values yielded by this future
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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
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more