Struct sea_orm::QueryStream

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pub struct QueryStream { /* private fields */ }
Expand description

The self-referencing struct.

Trait Implementations§

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impl Debug for QueryStream

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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 From<(Arc<MockDatabaseConnection>, Statement, Option<Arc<dyn Fn(&Info<'_>) + Send + Sync + 'static>>)> for QueryStream

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fn from(
(conn, stmt, metric_callback): (Arc<MockDatabaseConnection>, Statement, Option<Arc<dyn Fn(&Info<'_>) + Send + Sync>>)
) -> Self

Converts to this type from the input type.
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impl From<(PoolConnection<MySql>, Statement, Option<Arc<dyn Fn(&Info<'_>) + Send + Sync + 'static>>)> for QueryStream

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fn from(
(conn, stmt, metric_callback): (PoolConnection<MySql>, Statement, Option<Arc<dyn Fn(&Info<'_>) + Send + Sync>>)
) -> Self

Converts to this type from the input type.
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impl From<(PoolConnection<Postgres>, Statement, Option<Arc<dyn Fn(&Info<'_>) + Send + Sync + 'static>>)> for QueryStream

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fn from(
(conn, stmt, metric_callback): (PoolConnection<Postgres>, Statement, Option<Arc<dyn Fn(&Info<'_>) + Send + Sync>>)
) -> Self

Converts to this type from the input type.
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impl From<(PoolConnection<Sqlite>, Statement, Option<Arc<dyn Fn(&Info<'_>) + Send + Sync + 'static>>)> for QueryStream

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fn from(
(conn, stmt, metric_callback): (PoolConnection<Sqlite>, Statement, Option<Arc<dyn Fn(&Info<'_>) + Send + Sync>>)
) -> Self

Converts to this type from the input type.
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impl Stream for QueryStream

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type Item = Result<QueryResult, DbErr>

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

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere
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 Twhere
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 Twhere
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> 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 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.

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impl<I> IntoStream for Iwhere
I: Stream,

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type Item = <I as Stream>::Item

The type of the elements being iterated over.
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type IntoStream = I

Which kind of stream are we turning this into?
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fn into_stream(self) -> I

Creates a stream from a value.
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impl<T> Same<T> for T

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type Output = T

Should always be Self
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impl<T> StreamExt for Twhere
T: Stream + ?Sized,

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

Creates a future that resolves to the next item in the stream. Read more
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fn into_future(self) -> StreamFuture<Self>where
Self: Sized + Unpin,

Converts this stream into a future of (next_item, tail_of_stream). If the stream terminates, then the next item is None. Read more
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fn map<T, F>(self, f: F) -> Map<Self, F>where
F: FnMut(Self::Item) -> T,
Self: Sized,

Maps this stream’s items to a different type, returning a new stream of the resulting type. Read more
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fn enumerate(self) -> Enumerate<Self>where
Self: Sized,

Creates a stream which gives the current iteration count as well as the next value. Read more
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fn filter<Fut, F>(self, f: F) -> Filter<Self, Fut, F>where
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>,
Self: Sized,

Filters the values produced by this stream according to the provided asynchronous predicate. Read more
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fn filter_map<Fut, T, F>(self, f: F) -> FilterMap<Self, Fut, F>where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = Option<T>>,
Self: Sized,

Filters the values produced by this stream while simultaneously mapping them to a different type according to the provided asynchronous closure. Read more
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fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F>where
F: FnMut(Self::Item) -> Fut,
Fut: Future,
Self: Sized,

Computes from this stream’s items new items of a different type using an asynchronous closure. Read more
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fn collect<C>(self) -> Collect<Self, C>where
C: Default + Extend<Self::Item>,
Self: Sized,

Transforms a stream into a collection, returning a future representing the result of that computation. Read more
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fn unzip<A, B, FromA, FromB>(self) -> Unzip<Self, FromA, FromB>where
FromA: Default + Extend<A>,
FromB: Default + Extend<B>,
Self: Sized + Stream<Item = (A, B)>,

Converts a stream of pairs into a future, which resolves to pair of containers. Read more
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fn concat(self) -> Concat<Self>where
Self: Sized,
Self::Item: Extend<<Self::Item as IntoIterator>::Item> + IntoIterator + Default,

Concatenate all items of a stream into a single extendable destination, returning a future representing the end result. Read more
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fn count(self) -> Count<Self>where
Self: Sized,

Drives the stream to completion, counting the number of items. Read more
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fn cycle(self) -> Cycle<Self>where
Self: Sized + Clone,

Repeats a stream endlessly. Read more
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fn fold<T, Fut, F>(self, init: T, f: F) -> Fold<Self, Fut, T, F>where
F: FnMut(T, Self::Item) -> Fut,
Fut: Future<Output = T>,
Self: Sized,

Execute an accumulating asynchronous computation over a stream, collecting all the values into one final result. Read more
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fn any<Fut, F>(self, f: F) -> Any<Self, Fut, F>where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = bool>,
Self: Sized,

Execute predicate over asynchronous stream, and return true if any element in stream satisfied a predicate. Read more
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fn all<Fut, F>(self, f: F) -> All<Self, Fut, F>where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = bool>,
Self: Sized,

Execute predicate over asynchronous stream, and return true if all element in stream satisfied a predicate. Read more
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fn flatten(self) -> Flatten<Self>where
Self::Item: Stream,
Self: Sized,

Flattens a stream of streams into just one continuous stream. Read more
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fn flatten_unordered(
self,
limit: impl Into<Option<usize>>
) -> FlattenUnordered<Self>where
Self::Item: Stream + Unpin,
Self: Sized,

Flattens a stream of streams into just one continuous stream. Polls inner streams concurrently. Read more
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fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F>where
F: FnMut(Self::Item) -> U,
U: Stream,
Self: Sized,

Maps a stream like [StreamExt::map] but flattens nested Streams. Read more
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fn flat_map_unordered<U, F>(
self,
limit: impl Into<Option<usize>>,
f: F
) -> FlatMapUnordered<Self, U, F>where
U: Stream + Unpin,
F: FnMut(Self::Item) -> U,
Self: Sized,

Maps a stream like [StreamExt::map] but flattens nested Streams and polls them concurrently, yielding items in any order, as they made available. Read more
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fn scan<S, B, Fut, F>(self, initial_state: S, f: F) -> Scan<Self, S, Fut, F>where
F: FnMut(&mut S, Self::Item) -> Fut,
Fut: Future<Output = Option<B>>,
Self: Sized,

Combinator similar to [StreamExt::fold] that holds internal state and produces a new stream. Read more
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fn skip_while<Fut, F>(self, f: F) -> SkipWhile<Self, Fut, F>where
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>,
Self: Sized,

Skip elements on this stream while the provided asynchronous predicate resolves to true. Read more
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fn take_while<Fut, F>(self, f: F) -> TakeWhile<Self, Fut, F>where
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>,
Self: Sized,

Take elements from this stream while the provided asynchronous predicate resolves to true. Read more
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fn take_until<Fut>(self, fut: Fut) -> TakeUntil<Self, Fut>where
Fut: Future,
Self: Sized,

Take elements from this stream until the provided future resolves. Read more
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fn for_each<Fut, F>(self, f: F) -> ForEach<Self, Fut, F>where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = ()>,
Self: Sized,

Runs this stream to completion, executing the provided asynchronous closure for each element on the stream. Read more
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fn for_each_concurrent<Fut, F>(
self,
limit: impl Into<Option<usize>>,
f: F
) -> ForEachConcurrent<Self, Fut, F>where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = ()>,
Self: Sized,

Runs this stream to completion, executing the provided asynchronous closure for each element on the stream concurrently as elements become available. Read more
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fn take(self, n: usize) -> Take<Self>where
Self: Sized,

Creates a new stream of at most n items of the underlying stream. Read more
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fn skip(self, n: usize) -> Skip<Self>where
Self: Sized,

Creates a new stream which skips n items of the underlying stream. Read more
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fn fuse(self) -> Fuse<Self>where
Self: Sized,

Fuse a stream such that poll_next will never again be called once it has finished. This method can be used to turn any Stream into a FusedStream. Read more
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fn by_ref(&mut self) -> &mut Self

Borrows a stream, rather than consuming it. Read more
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fn catch_unwind(self) -> CatchUnwind<Self>where
Self: Sized + UnwindSafe,

Catches unwinding panics while polling the stream. Read more
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fn boxed<'a>(
self
) -> Pin<Box<dyn Stream<Item = Self::Item> + Send + 'a, Global>>where
Self: Sized + Send + 'a,

Wrap the stream in a Box, pinning it. Read more
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fn boxed_local<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + 'a, Global>>where
Self: Sized + 'a,

Wrap the stream in a Box, pinning it. Read more
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fn buffered(self, n: usize) -> Buffered<Self>where
Self::Item: Future,
Self: Sized,

An adaptor for creating a buffered list of pending futures. Read more
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fn buffer_unordered(self, n: usize) -> BufferUnordered<Self>where
Self::Item: Future,
Self: Sized,

An adaptor for creating a buffered list of pending futures (unordered). Read more
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fn zip<St>(self, other: St) -> Zip<Self, St>where
St: Stream,
Self: Sized,

An adapter for zipping two streams together. Read more
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fn chain<St>(self, other: St) -> Chain<Self, St>where
St: Stream<Item = Self::Item>,
Self: Sized,

Adapter for chaining two streams. Read more
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fn peekable(self) -> Peekable<Self>where
Self: Sized,

Creates a new stream which exposes a peek method. Read more
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fn chunks(self, capacity: usize) -> Chunks<Self>where
Self: Sized,

An adaptor for chunking up items of the stream inside a vector. Read more
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fn ready_chunks(self, capacity: usize) -> ReadyChunks<Self>where
Self: Sized,

An adaptor for chunking up ready items of the stream inside a vector. Read more
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fn forward<S>(self, sink: S) -> Forward<Self, S>where
S: Sink<Self::Ok, Error = Self::Error>,
Self: TryStream + Sized,

A future that completes after the given stream has been fully processed into the sink and the sink has been flushed and closed. Read more
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fn split<Item>(self) -> (SplitSink<Self, Item>, SplitStream<Self>)where
Self: Sink<Item> + Sized,

Splits this Stream + Sink object into separate Sink and Stream objects. Read more
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fn inspect<F>(self, f: F) -> Inspect<Self, F>where
F: FnMut(&Self::Item),
Self: Sized,

Do something with each item of this stream, afterwards passing it on. Read more
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fn left_stream<B>(self) -> Either<Self, B>where
B: Stream<Item = Self::Item>,
Self: Sized,

Wrap this stream in an Either stream, making it the left-hand variant of that Either. Read more
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fn right_stream<B>(self) -> Either<B, Self>where
B: Stream<Item = Self::Item>,
Self: Sized,

Wrap this stream in an Either stream, making it the right-hand variant of that Either. Read more
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fn poll_next_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Option<Self::Item>>where
Self: Unpin,

A convenience method for calling [Stream::poll_next] on Unpin stream types.
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fn select_next_some(&mut self) -> SelectNextSome<'_, Self>where
Self: Unpin + FusedStream,

Returns a Future that resolves when the next item in this stream is ready. Read more
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impl<T> StreamExt for Twhere
T: Stream + ?Sized,

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fn next(&mut self) -> NextFuture<'_, Self>where
Self: Unpin,

Advances the stream and returns the next value. Read more
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fn take(self, n: usize) -> Take<Self>where
Self: Sized,

Creates a stream that yields its first n elements. Read more
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fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P>where
Self: Sized,
P: FnMut(&Self::Item) -> bool,

Creates a stream that yields elements based on a predicate. Read more
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fn throttle(self, d: Duration) -> Throttle<Self>where
Self: Sized,

Limit the amount of items yielded per timeslice in a stream. Read more
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fn step_by(self, step: usize) -> StepBy<Self>where
Self: Sized,

Creates a stream that yields each stepth element. Read more
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fn chain<U>(self, other: U) -> Chain<Self, U>where
Self: Sized,
U: Stream<Item = Self::Item>,

Takes two streams and creates a new stream over both in sequence. Read more
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fn cloned<'a, T>(self) -> Cloned<Self>where
Self: Sized + Stream<Item = &'a T>,
T: Clone + 'a,

Creates an stream which copies all of its elements. Read more
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fn copied<'a, T>(self) -> Copied<Self>where
Self: Sized + Stream<Item = &'a T>,
T: Copy + 'a,

Creates an stream which copies all of its elements. Read more
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fn cycle(self) -> Cycle<Self>where
Self: Clone + Sized,

Creates a stream that yields the provided values infinitely and in order. Read more
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fn enumerate(self) -> Enumerate<Self>where
Self: Sized,

Creates a stream that gives the current element’s count as well as the next value. Read more
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fn delay(self, dur: Duration) -> Delay<Self>where
Self: Sized,

Creates a stream that is delayed before it starts yielding items. Read more
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fn map<B, F>(self, f: F) -> Map<Self, F>where
Self: Sized,
F: FnMut(Self::Item) -> B,

Takes a closure and creates a stream that calls that closure on every element of this stream. Read more
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fn inspect<F>(self, f: F) -> Inspect<Self, F>where
Self: Sized,
F: FnMut(&Self::Item),

A combinator that does something with each element in the stream, passing the value on. Read more
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fn last(self) -> LastFuture<Self, Self::Item>where
Self: Sized,

Returns the last element of the stream. Read more
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fn fuse(self) -> Fuse<Self>where
Self: Sized,

Creates a stream which ends after the first None. Read more
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fn filter<P>(self, predicate: P) -> Filter<Self, P>where
Self: Sized,
P: FnMut(&Self::Item) -> bool,

Creates a stream that uses a predicate to determine if an element should be yielded. Read more
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fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F>where
Self: Sized,
U: IntoStream,
F: FnMut(Self::Item) -> U,

Creates an stream that works like map, but flattens nested structure. Read more
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fn flatten(self) -> Flatten<Self>where
Self: Sized,
Self::Item: IntoStream,

Creates an stream that flattens nested structure. Read more
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fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F>where
Self: Sized,
F: FnMut(Self::Item) -> Option<B>,

Both filters and maps a stream. Read more
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fn min_by_key<B, F>(self, key_by: F) -> MinByKeyFuture<Self, Self::Item, F>where
Self: Sized,
B: Ord,
F: FnMut(&Self::Item) -> B,

Returns the element that gives the minimum value with respect to the specified key function. If several elements are equally minimum, the first element is returned. If the stream is empty, None is returned. Read more
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fn max_by_key<B, F>(self, key_by: F) -> MaxByKeyFuture<Self, Self::Item, F>where
Self: Sized,
B: Ord,
F: FnMut(&Self::Item) -> B,

Returns the element that gives the maximum value with respect to the specified key function. If several elements are equally maximum, the first element is returned. If the stream is empty, None is returned. Read more
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fn min_by<F>(self, compare: F) -> MinByFuture<Self, F, Self::Item>where
Self: Sized,
F: FnMut(&Self::Item, &Self::Item) -> Ordering,

Returns the element that gives the minimum value with respect to the specified comparison function. If several elements are equally minimum, the first element is returned. If the stream is empty, None is returned. Read more
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fn max(self) -> MaxFuture<Self, Self::Item>where
Self: Sized,
Self::Item: Ord,

Returns the element that gives the maximum value. If several elements are equally maximum, the first element is returned. If the stream is empty, None is returned. Read more
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fn min(self) -> MinFuture<Self, Self::Item>where
Self: Sized,
Self::Item: Ord,

Returns the element that gives the minimum value. If several elements are equally minimum, the first element is returned. If the stream is empty, None is returned. Read more
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fn max_by<F>(self, compare: F) -> MaxByFuture<Self, F, Self::Item>where
Self: Sized,
F: FnMut(&Self::Item, &Self::Item) -> Ordering,

Returns the element that gives the maximum value with respect to the specified comparison function. If several elements are equally maximum, the first element is returned. If the stream is empty, None is returned. Read more
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fn nth(&mut self, n: usize) -> NthFuture<'_, Self>where
Self: Unpin + Sized,

Returns the nth element of the stream. Read more
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fn all<F>(&mut self, f: F) -> AllFuture<'_, Self, F, Self::Item>where
Self: Unpin + Sized,
F: FnMut(Self::Item) -> bool,

Tests if every element of the stream matches a predicate. Read more
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fn find<P>(&mut self, p: P) -> FindFuture<'_, Self, P>where
Self: Unpin + Sized,
P: FnMut(&Self::Item) -> bool,

Searches for an element in a stream that satisfies a predicate. Read more
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fn find_map<F, B>(&mut self, f: F) -> FindMapFuture<'_, Self, F>where
Self: Unpin + Sized,
F: FnMut(Self::Item) -> Option<B>,

Applies function to the elements of stream and returns the first non-none result. Read more
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fn fold<B, F>(self, init: B, f: F) -> FoldFuture<Self, F, B>where
Self: Sized,
F: FnMut(B, Self::Item) -> B,

A combinator that applies a function to every element in a stream producing a single, final value. Read more
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fn partition<B, F>(self, f: F) -> PartitionFuture<Self, F, B>where
Self: Sized,
F: FnMut(&Self::Item) -> bool,
B: Default + Extend<Self::Item>,

A combinator that applies a function to every element in a stream creating two collections from it. Read more
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fn for_each<F>(self, f: F) -> ForEachFuture<Self, F>where
Self: Sized,
F: FnMut(Self::Item),

Call a closure on each element of the stream. Read more
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fn any<F>(&mut self, f: F) -> AnyFuture<'_, Self, F, Self::Item>where
Self: Unpin + Sized,
F: FnMut(Self::Item) -> bool,

Tests if any element of the stream matches a predicate. Read more
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fn by_ref(&mut self) -> &mut Self

Borrows an stream, rather than consuming it. Read more
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fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F>where
Self: Sized,
F: FnMut(&mut St, Self::Item) -> Option<B>,

A stream adaptor similar to fold that holds internal state and produces a new stream. Read more
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fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P>where
Self: Sized,
P: FnMut(&Self::Item) -> bool,

Combinator that skips elements based on a predicate. Read more
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fn skip(self, n: usize) -> Skip<Self>where
Self: Sized,

Creates a combinator that skips the first n elements. Read more
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fn timeout(self, dur: Duration) -> Timeout<Self>where
Self: Stream + Sized,

Await a stream or times out after a duration of time. Read more
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fn try_fold<B, F, T, E>(&mut self, init: T, f: F) -> TryFoldFuture<'_, Self, F, T>where
Self: Unpin + Sized,
F: FnMut(B, Self::Item) -> Result<T, E>,

A combinator that applies a function as long as it returns successfully, producing a single, final value. Immediately returns the error when the function returns unsuccessfully. Read more
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fn try_for_each<F, E>(&mut self, f: F) -> TryForEachFuture<'_, Self, F>where
Self: Unpin + Sized,
F: FnMut(Self::Item) -> Result<(), E>,

Applies a falliable function to each element in a stream, stopping at first error and returning it. Read more
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fn zip<U>(self, other: U) -> Zip<Self, U>where
Self: Sized,
U: Stream,

‘Zips up’ two streams into a single stream of pairs. Read more
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fn unzip<A, B, FromA, FromB>(self) -> UnzipFuture<Self, FromA, FromB>where
FromA: Default + Extend<A>,
FromB: Default + Extend<B>,
Self: Stream<Item = (A, B)> + Sized,

Converts an stream of pairs into a pair of containers. Read more
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fn collect<'a, B>(self) -> Pin<Box<dyn Future<Output = B> + Send + 'a, Global>>where
Self: Sized + 'a + Send,
B: FromStream<Self::Item>,
Self::Item: Send,

Transforms a stream into a collection. Read more
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fn merge<U>(self, other: U) -> Merge<Self, U>where
Self: Sized,
U: Stream<Item = Self::Item>,

Combines multiple streams into a single stream of all their outputs. Read more
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fn partial_cmp<S>(self, other: S) -> PartialCmpFuture<Self, S>where
Self: Sized + Stream,
S: Stream,
Self::Item: PartialOrd<<S as Stream>::Item>,

Lexicographically compares the elements of this Stream with those of another. Read more
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fn position<P>(&mut self, predicate: P) -> PositionFuture<'_, Self, P>where
Self: Unpin + Sized,
P: FnMut(Self::Item) -> bool,

Searches for an element in a Stream that satisfies a predicate, returning its index. Read more
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fn cmp<S>(self, other: S) -> CmpFuture<Self, S>where
Self: Sized + Stream,
S: Stream,
Self::Item: Ord,

Lexicographically compares the elements of this Stream with those of another using ‘Ord’. Read more
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fn count(self) -> CountFuture<Self>where
Self: Sized,

Counts the number of elements in the stream. Read more
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fn ne<S>(self, other: S) -> NeFuture<Self, S>where
Self: Sized,
S: Stream,
Self::Item: PartialEq<<S as Stream>::Item>,

Determines if the elements of this Stream are lexicographically not equal to those of another. Read more
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fn ge<S>(self, other: S) -> GeFuture<Self, S>where
Self: Sized + Stream,
S: Stream,
Self::Item: PartialOrd<<S as Stream>::Item>,

Determines if the elements of this Stream are lexicographically greater than or equal to those of another. Read more
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fn eq<S>(self, other: S) -> EqFuture<Self, S>where
Self: Sized + Stream,
S: Stream,
Self::Item: PartialEq<<S as Stream>::Item>,

Determines if the elements of this Stream are lexicographically equal to those of another. Read more
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fn gt<S>(self, other: S) -> GtFuture<Self, S>where
Self: Sized + Stream,
S: Stream,
Self::Item: PartialOrd<<S as Stream>::Item>,

Determines if the elements of this Stream are lexicographically greater than those of another. Read more
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fn le<S>(self, other: S) -> LeFuture<Self, S>where
Self: Sized + Stream,
S: Stream,
Self::Item: PartialOrd<<S as Stream>::Item>,

Determines if the elements of this Stream are lexicographically less or equal to those of another. Read more
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fn lt<S>(self, other: S) -> LtFuture<Self, S>where
Self: Sized + Stream,
S: Stream,
Self::Item: PartialOrd<<S as Stream>::Item>,

Determines if the elements of this Stream are lexicographically less than those of another. Read more
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fn sum<'a, S>(self) -> Pin<Box<dyn Future<Output = S> + 'a, Global>>where
Self: Sized + Stream<Item = S> + 'a,
S: Sum<Self::Item>,

Sums the elements of a stream. Read more
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fn product<'a, P>(self) -> Pin<Box<dyn Future<Output = P> + 'a, Global>>where
Self: Sized + Stream<Item = P> + 'a,
P: Product<P>,

Multiplies all elements of the stream. Read more
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impl<S> StreamExt for Swhere
S: Stream + ?Sized,

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

A convenience for calling [Stream::poll_next()] on !Unpin types.
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fn next(&mut self) -> NextFuture<'_, Self>where
Self: Unpin,

Retrieves the next item in the stream. Read more
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fn try_next<T, E>(&mut self) -> TryNextFuture<'_, Self>where
Self: Stream<Item = Result<T, E>> + Unpin,

Retrieves the next item in the stream. Read more
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fn count(self) -> CountFuture<Self>where
Self: Sized,

Counts the number of items in the stream. Read more
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fn map<T, F>(self, f: F) -> Map<Self, F>where
Self: Sized,
F: FnMut(Self::Item) -> T,

Maps items of the stream to new values using a closure. Read more
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fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F>where
Self: Sized,
U: Stream,
F: FnMut(Self::Item) -> U,

Maps items to streams and then concatenates them. Read more
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fn flatten(self) -> Flatten<Self>where
Self: Sized,
Self::Item: Stream,

Concatenates inner streams. Read more
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fn then<F, Fut>(self, f: F) -> Then<Self, F, Fut>where
Self: Sized,
F: FnMut(Self::Item) -> Fut,
Fut: Future,

Maps items of the stream to new values using an async closure. Read more
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fn filter<P>(self, predicate: P) -> Filter<Self, P>where
Self: Sized,
P: FnMut(&Self::Item) -> bool,

Keeps items of the stream for which predicate returns true. Read more
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fn filter_map<T, F>(self, f: F) -> FilterMap<Self, F>where
Self: Sized,
F: FnMut(Self::Item) -> Option<T>,

Filters and maps items of the stream using a closure. Read more
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fn take(self, n: usize) -> Take<Self>where
Self: Sized,

Takes only the first n items of the stream. Read more
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fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P>where
Self: Sized,
P: FnMut(&Self::Item) -> bool,

Takes items while predicate returns true. Read more
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fn skip(self, n: usize) -> Skip<Self>where
Self: Sized,

Skips the first n items of the stream. Read more
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fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P>where
Self: Sized,
P: FnMut(&Self::Item) -> bool,

Skips items while predicate returns true. Read more
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fn step_by(self, step: usize) -> StepBy<Self>where
Self: Sized,

Yields every stepth item. Read more
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fn chain<U>(self, other: U) -> Chain<Self, U>where
Self: Sized,
U: Stream<Item = Self::Item>,

Appends another stream to the end of this one. Read more
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fn cloned<'a, T>(self) -> Cloned<Self>where
Self: Stream<Item = &'a T> + Sized,
T: Clone + 'a,

Clones all items. Read more
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fn copied<'a, T>(self) -> Copied<Self>where
Self: Stream<Item = &'a T> + Sized,
T: Copy + 'a,

Copies all items. Read more
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fn collect<C>(self) -> CollectFuture<Self, C>where
Self: Sized,
C: Default + Extend<Self::Item>,

Collects all items in the stream into a collection. Read more
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fn try_collect<T, E, C>(self) -> TryCollectFuture<Self, C>where
Self: Stream<Item = Result<T, E>> + Sized,
C: Default + Extend<T>,

Collects all items in the fallible stream into a collection. Read more
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fn partition<B, P>(self, predicate: P) -> PartitionFuture<Self, P, B>where
Self: Sized,
B: Default + Extend<Self::Item>,
P: FnMut(&Self::Item) -> bool,

Partitions items into those for which predicate is true and those for which it is false, and then collects them into two collections. Read more
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fn fold<T, F>(self, init: T, f: F) -> FoldFuture<Self, F, T>where
Self: Sized,
F: FnMut(T, Self::Item) -> T,

Accumulates a computation over the stream. Read more
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fn try_fold<T, E, F, B>(&mut self, init: B, f: F) -> TryFoldFuture<'_, Self, F, B>where
Self: Stream<Item = Result<T, E>> + Unpin + Sized,
F: FnMut(B, T) -> Result<B, E>,

Accumulates a fallible computation over the stream. Read more
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fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F>where
Self: Sized,
F: FnMut(&mut St, Self::Item) -> Option<B>,

Maps items of the stream to new values using a state value and a closure. Read more
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fn fuse(self) -> Fuse<Self>where
Self: Sized,

Fuses the stream so that it stops yielding items after the first None. Read more
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fn cycle(self) -> Cycle<Self>where
Self: Clone + Sized,

Repeats the stream from beginning to end, forever. Read more
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fn enumerate(self) -> Enumerate<Self>where
Self: Sized,

Enumerates items, mapping them to (index, item). Read more
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fn inspect<F>(self, f: F) -> Inspect<Self, F>where
Self: Sized,
F: FnMut(&Self::Item),

Calls a closure on each item and passes it on. Read more
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fn nth(&mut self, n: usize) -> NthFuture<'_, Self>where
Self: Unpin,

Gets the nth item of the stream. Read more
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fn last(self) -> LastFuture<Self>where
Self: Sized,

Returns the last item in the stream. Read more
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fn find<P>(&mut self, predicate: P) -> FindFuture<'_, Self, P>where
Self: Unpin,
P: FnMut(&Self::Item) -> bool,

Finds the first item of the stream for which predicate returns true. Read more
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fn find_map<F, B>(&mut self, f: F) -> FindMapFuture<'_, Self, F>where
Self: Unpin,
F: FnMut(Self::Item) -> Option<B>,

Applies a closure to items in the stream and returns the first Some result. Read more
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fn position<P>(&mut self, predicate: P) -> PositionFuture<'_, Self, P>where
Self: Unpin,
P: FnMut(Self::Item) -> bool,

Finds the index of the first item of the stream for which predicate returns true. Read more
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fn all<P>(&mut self, predicate: P) -> AllFuture<'_, Self, P>where
Self: Unpin,
P: FnMut(Self::Item) -> bool,

Tests if predicate returns true for all items in the stream. Read more
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fn any<P>(&mut self, predicate: P) -> AnyFuture<'_, Self, P>where
Self: Unpin,
P: FnMut(Self::Item) -> bool,

Tests if predicate returns true for any item in the stream. Read more
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fn for_each<F>(self, f: F) -> ForEachFuture<Self, F>where
Self: Sized,
F: FnMut(Self::Item),

Calls a closure on each item of the stream. Read more
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fn try_for_each<F, E>(&mut self, f: F) -> TryForEachFuture<'_, Self, F>where
Self: Unpin,
F: FnMut(Self::Item) -> Result<(), E>,

Calls a fallible closure on each item of the stream, stopping on first error. Read more
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fn zip<U>(self, other: U) -> Zip<Self, U>where
Self: Sized,
U: Stream,

Zips up two streams into a single stream of pairs. Read more
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fn unzip<A, B, FromA, FromB>(self) -> UnzipFuture<Self, FromA, FromB>where
FromA: Default + Extend<A>,
FromB: Default + Extend<B>,
Self: Stream<Item = (A, B)> + Sized,

Collects a stream of pairs into a pair of collections. Read more
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fn or<S>(self, other: S) -> Or<Self, S>where
Self: Sized,
S: Stream<Item = Self::Item>,

Merges with other stream, preferring items from self whenever both streams are ready. Read more
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fn race<S>(self, other: S) -> Race<Self, S>where
Self: Sized,
S: Stream<Item = Self::Item>,

Merges with other stream, with no preference for either stream when both are ready. Read more
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fn boxed<'a>(
self
) -> Pin<Box<dyn Stream<Item = Self::Item> + Send + 'a, Global>>where
Self: Send + Sized + 'a,

Boxes the stream and changes its type to dyn Stream + Send + 'a. Read more
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fn boxed_local<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + 'a, Global>>where
Self: Sized + 'a,

Boxes the stream and changes its type to dyn Stream + 'a. Read more
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impl<T, U> TryFrom<U> for Twhere
U: Into<T>,

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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<U>>::Error>

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

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

The type returned in the event of a conversion error.
const: unstable · source§

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

Performs the conversion.
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impl<S, T, E> TryStream for Swhere
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<S> TryStreamExt for Swhere
S: TryStream + ?Sized,

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fn err_into<E>(self) -> ErrInto<Self, E>where
Self: Sized,
Self::Error: Into<E>,

Wraps the current stream in a new stream which converts the error type into the one provided. Read more
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fn map_ok<T, F>(self, f: F) -> MapOk<Self, F>where
Self: Sized,
F: FnMut(Self::Ok) -> T,

Wraps the current stream in a new stream which maps the success value using the provided closure. Read more
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fn map_err<E, F>(self, f: F) -> MapErr<Self, F>where
Self: Sized,
F: FnMut(Self::Error) -> E,

Wraps the current stream in a new stream which maps the error value using the provided closure. Read more
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fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F>where
F: FnMut(Self::Ok) -> Fut,
Fut: TryFuture<Error = Self::Error>,
Self: Sized,

Chain on a computation for when a value is ready, passing the successful results to the provided closure f. Read more
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fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F>where
F: FnMut(Self::Error) -> Fut,
Fut: TryFuture<Ok = Self::Ok>,
Self: Sized,

Chain on a computation for when an error happens, passing the erroneous result to the provided closure f. Read more
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fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F>where
F: FnMut(&Self::Ok),
Self: Sized,

Do something with the success value of this stream, afterwards passing it on. Read more
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fn inspect_err<F>(self, f: F) -> InspectErr<Self, F>where
F: FnMut(&Self::Error),
Self: Sized,

Do something with the error value of this stream, afterwards passing it on. Read more
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fn into_stream(self) -> IntoStream<Self>where
Self: Sized,

Wraps a [TryStream] into a type that implements Stream Read more
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fn try_next(&mut self) -> TryNext<'_, Self>where
Self: Unpin,

Creates a future that attempts to resolve the next item in the stream. If an error is encountered before the next item, the error is returned instead. Read more
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fn try_for_each<Fut, F>(self, f: F) -> TryForEach<Self, Fut, F>where
F: FnMut(Self::Ok) -> Fut,
Fut: TryFuture<Ok = (), Error = Self::Error>,
Self: Sized,

Attempts to run this stream to completion, executing the provided asynchronous closure for each element on the stream. Read more
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fn try_skip_while<Fut, F>(self, f: F) -> TrySkipWhile<Self, Fut, F>where
F: FnMut(&Self::Ok) -> Fut,
Fut: TryFuture<Ok = bool, Error = Self::Error>,
Self: Sized,

Skip elements on this stream while the provided asynchronous predicate resolves to true. Read more
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fn try_take_while<Fut, F>(self, f: F) -> TryTakeWhile<Self, Fut, F>where
F: FnMut(&Self::Ok) -> Fut,
Fut: TryFuture<Ok = bool, Error = Self::Error>,
Self: Sized,

Take elements on this stream while the provided asynchronous predicate resolves to true. Read more
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fn try_for_each_concurrent<Fut, F>(
self,
limit: impl Into<Option<usize>>,
f: F
) -> TryForEachConcurrent<Self, Fut, F>where
F: FnMut(Self::Ok) -> Fut,
Fut: Future<Output = Result<(), Self::Error>>,
Self: Sized,

Attempts to run this stream to completion, executing the provided asynchronous closure for each element on the stream concurrently as elements become available, exiting as soon as an error occurs. Read more
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fn try_collect<C>(self) -> TryCollect<Self, C>where
C: Default + Extend<Self::Ok>,
Self: Sized,

Attempt to transform a stream into a collection, returning a future representing the result of that computation. Read more
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fn try_chunks(self, capacity: usize) -> TryChunks<Self>where
Self: Sized,

An adaptor for chunking up successful items of the stream inside a vector. Read more
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fn try_filter<Fut, F>(self, f: F) -> TryFilter<Self, Fut, F>where
Fut: Future<Output = bool>,
F: FnMut(&Self::Ok) -> Fut,
Self: Sized,

Attempt to filter the values produced by this stream according to the provided asynchronous closure. Read more
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fn try_filter_map<Fut, F, T>(self, f: F) -> TryFilterMap<Self, Fut, F>where
Fut: TryFuture<Ok = Option<T>, Error = Self::Error>,
F: FnMut(Self::Ok) -> Fut,
Self: Sized,

Attempt to filter the values produced by this stream while simultaneously mapping them to a different type according to the provided asynchronous closure. Read more
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fn try_flatten(self) -> TryFlatten<Self>where
Self::Ok: TryStream,
<Self::Ok as TryStream>::Error: From<Self::Error>,
Self: Sized,

Flattens a stream of streams into just one continuous stream. Read more
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fn try_fold<T, Fut, F>(self, init: T, f: F) -> TryFold<Self, Fut, T, F>where
F: FnMut(T, Self::Ok) -> Fut,
Fut: TryFuture<Ok = T, Error = Self::Error>,
Self: Sized,

Attempt to execute an accumulating asynchronous computation over a stream, collecting all the values into one final result. Read more
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fn try_concat(self) -> TryConcat<Self>where
Self: Sized,
Self::Ok: Extend<<Self::Ok as IntoIterator>::Item> + IntoIterator + Default,

Attempt to concatenate all items of a stream into a single extendable destination, returning a future representing the end result. Read more
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fn try_buffer_unordered(self, n: usize) -> TryBufferUnordered<Self>where
Self::Ok: TryFuture<Error = Self::Error>,
Self: Sized,

Attempt to execute several futures from a stream concurrently (unordered). Read more
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fn try_buffered(self, n: usize) -> TryBuffered<Self>where
Self::Ok: TryFuture<Error = Self::Error>,
Self: Sized,

Attempt to execute several futures from a stream concurrently. Read more
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fn try_poll_next_unpin(
&mut self,
cx: &mut Context<'_>
) -> Poll<Option<Result<Self::Ok, Self::Error>>>where
Self: Unpin,

A convenience method for calling [TryStream::try_poll_next] on Unpin stream types.
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fn into_async_read(self) -> IntoAsyncRead<Self>where
Self: Sized + TryStreamExt<Error = Error>,
Self::Ok: AsRef<[u8]>,

Adapter that converts this stream into an AsyncBufRead. Read more
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impl<V, T> VZip<V> for Twhere
V: MultiLane<T>,

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fn vzip(self) -> V

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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