pub struct TryIter<'a, T: 'a> { /* private fields */ }
Expand description
An iterator that attempts to yield all pending values for a Receiver
,
created by try_iter
.
None
will be returned when there are no pending values remaining or
if the corresponding channel has hung up.
This iterator will never block the caller in order to wait for data to
become available. Instead, it will return None
.
§Examples
use std::sync::mpsc::channel;
use std::thread;
use std::time::Duration;
let (sender, receiver) = channel();
// Nothing is in the buffer yet
assert!(receiver.try_iter().next().is_none());
println!("Nothing in the buffer...");
thread::spawn(move || {
sender.send(1).unwrap();
sender.send(2).unwrap();
sender.send(3).unwrap();
});
println!("Going to sleep...");
thread::sleep(Duration::from_secs(2)); // block for two seconds
for x in receiver.try_iter() {
println!("Got: {x}");
}
Trait Implementations§
1.15.0 · source§impl<'a, T> Iterator for TryIter<'a, T>
impl<'a, T> Iterator for TryIter<'a, T>
source§fn next_chunk<const N: usize>(
&mut self,
) -> Result<[Self::Item; N], IntoIter<Self::Item, N>>where
Self: Sized,
fn next_chunk<const N: usize>(
&mut self,
) -> Result<[Self::Item; N], IntoIter<Self::Item, N>>where
Self: Sized,
🔬This is a nightly-only experimental API. (
iter_next_chunk
#98326)Advances the iterator and returns an array containing the next
N
values. Read more1.0.0 · source§fn size_hint(&self) -> (usize, Option<usize>)
fn size_hint(&self) -> (usize, Option<usize>)
Returns the bounds on the remaining length of the iterator. Read more
1.0.0 · source§fn count(self) -> usizewhere
Self: Sized,
fn count(self) -> usizewhere
Self: Sized,
Consumes the iterator, counting the number of iterations and returning it. Read more
1.0.0 · source§fn last(self) -> Option<Self::Item>where
Self: Sized,
fn last(self) -> Option<Self::Item>where
Self: Sized,
Consumes the iterator, returning the last element. Read more
source§fn advance_by(&mut self, n: usize) -> Result<(), NonZero<usize>>
fn advance_by(&mut self, n: usize) -> Result<(), NonZero<usize>>
🔬This is a nightly-only experimental API. (
iter_advance_by
#77404)Advances the iterator by
n
elements. Read more1.0.0 · source§fn nth(&mut self, n: usize) -> Option<Self::Item>
fn nth(&mut self, n: usize) -> Option<Self::Item>
Returns the
n
th element of the iterator. Read more1.28.0 · source§fn step_by(self, step: usize) -> StepBy<Self> ⓘwhere
Self: Sized,
fn step_by(self, step: usize) -> StepBy<Self> ⓘwhere
Self: Sized,
Creates an iterator starting at the same point, but stepping by
the given amount at each iteration. Read more
1.0.0 · source§fn chain<U>(self, other: U) -> Chain<Self, <U as IntoIterator>::IntoIter> ⓘ
fn chain<U>(self, other: U) -> Chain<Self, <U as IntoIterator>::IntoIter> ⓘ
Takes two iterators and creates a new iterator over both in sequence. Read more
1.0.0 · source§fn zip<U>(self, other: U) -> Zip<Self, <U as IntoIterator>::IntoIter> ⓘwhere
Self: Sized,
U: IntoIterator,
fn zip<U>(self, other: U) -> Zip<Self, <U as IntoIterator>::IntoIter> ⓘwhere
Self: Sized,
U: IntoIterator,
‘Zips up’ two iterators into a single iterator of pairs. Read more
source§fn intersperse_with<G>(self, separator: G) -> IntersperseWith<Self, G> ⓘ
fn intersperse_with<G>(self, separator: G) -> IntersperseWith<Self, G> ⓘ
🔬This is a nightly-only experimental API. (
iter_intersperse
#79524)Creates a new iterator which places an item generated by
separator
between adjacent items of the original iterator. Read more1.0.0 · source§fn map<B, F>(self, f: F) -> Map<Self, F> ⓘ
fn map<B, F>(self, f: F) -> Map<Self, F> ⓘ
Takes a closure and creates an iterator which calls that closure on each
element. Read more
1.0.0 · source§fn filter<P>(self, predicate: P) -> Filter<Self, P> ⓘ
fn filter<P>(self, predicate: P) -> Filter<Self, P> ⓘ
Creates an iterator which uses a closure to determine if an element
should be yielded. Read more
1.0.0 · source§fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F> ⓘ
fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F> ⓘ
Creates an iterator that both filters and maps. Read more
1.0.0 · source§fn enumerate(self) -> Enumerate<Self> ⓘwhere
Self: Sized,
fn enumerate(self) -> Enumerate<Self> ⓘwhere
Self: Sized,
Creates an iterator which gives the current iteration count as well as
the next value. Read more
1.0.0 · source§fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P> ⓘ
fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P> ⓘ
1.0.0 · source§fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P> ⓘ
fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P> ⓘ
Creates an iterator that yields elements based on a predicate. Read more
1.57.0 · source§fn map_while<B, P>(self, predicate: P) -> MapWhile<Self, P> ⓘ
fn map_while<B, P>(self, predicate: P) -> MapWhile<Self, P> ⓘ
Creates an iterator that both yields elements based on a predicate and maps. Read more
1.0.0 · source§fn skip(self, n: usize) -> Skip<Self> ⓘwhere
Self: Sized,
fn skip(self, n: usize) -> Skip<Self> ⓘwhere
Self: Sized,
Creates an iterator that skips the first
n
elements. Read more1.0.0 · source§fn take(self, n: usize) -> Take<Self> ⓘwhere
Self: Sized,
fn take(self, n: usize) -> Take<Self> ⓘwhere
Self: Sized,
Creates an iterator that yields the first
n
elements, or fewer
if the underlying iterator ends sooner. Read more1.0.0 · source§fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F> ⓘ
fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F> ⓘ
Creates an iterator that works like map, but flattens nested structure. Read more
source§fn map_windows<F, R, const N: usize>(self, f: F) -> MapWindows<Self, F, N> ⓘ
fn map_windows<F, R, const N: usize>(self, f: F) -> MapWindows<Self, F, N> ⓘ
🔬This is a nightly-only experimental API. (
iter_map_windows
#87155)Calls the given function
f
for each contiguous window of size N
over
self
and returns an iterator over the outputs of f
. Like slice::windows()
,
the windows during mapping overlap as well. Read more1.0.0 · source§fn inspect<F>(self, f: F) -> Inspect<Self, F> ⓘ
fn inspect<F>(self, f: F) -> Inspect<Self, F> ⓘ
Does something with each element of an iterator, passing the value on. Read more
1.0.0 · source§fn by_ref(&mut self) -> &mut Selfwhere
Self: Sized,
fn by_ref(&mut self) -> &mut Selfwhere
Self: Sized,
Borrows an iterator, rather than consuming it. Read more
source§fn collect_into<E>(self, collection: &mut E) -> &mut E
fn collect_into<E>(self, collection: &mut E) -> &mut E
🔬This is a nightly-only experimental API. (
iter_collect_into
#94780)Collects all the items from an iterator into a collection. Read more
1.0.0 · source§fn partition<B, F>(self, f: F) -> (B, B)
fn partition<B, F>(self, f: F) -> (B, B)
Consumes an iterator, creating two collections from it. Read more
source§fn is_partitioned<P>(self, predicate: P) -> bool
fn is_partitioned<P>(self, predicate: P) -> bool
🔬This is a nightly-only experimental API. (
iter_is_partitioned
#62544)Checks if the elements of this iterator are partitioned according to the given predicate,
such that all those that return
true
precede all those that return false
. Read more1.27.0 · source§fn try_fold<B, F, R>(&mut self, init: B, f: F) -> R
fn try_fold<B, F, R>(&mut self, init: B, f: F) -> R
An iterator method that applies a function as long as it returns
successfully, producing a single, final value. Read more
1.27.0 · source§fn try_for_each<F, R>(&mut self, f: F) -> R
fn try_for_each<F, R>(&mut self, f: F) -> R
An iterator method that applies a fallible function to each item in the
iterator, stopping at the first error and returning that error. Read more
1.0.0 · source§fn fold<B, F>(self, init: B, f: F) -> B
fn fold<B, F>(self, init: B, f: F) -> B
Folds every element into an accumulator by applying an operation,
returning the final result. Read more
1.51.0 · source§fn reduce<F>(self, f: F) -> Option<Self::Item>
fn reduce<F>(self, f: F) -> Option<Self::Item>
Reduces the elements to a single one, by repeatedly applying a reducing
operation. Read more
source§fn try_reduce<R>(
&mut self,
f: impl FnMut(Self::Item, Self::Item) -> R,
) -> <<R as Try>::Residual as Residual<Option<<R as Try>::Output>>>::TryType
fn try_reduce<R>( &mut self, f: impl FnMut(Self::Item, Self::Item) -> R, ) -> <<R as Try>::Residual as Residual<Option<<R as Try>::Output>>>::TryType
🔬This is a nightly-only experimental API. (
iterator_try_reduce
#87053)Reduces the elements to a single one by repeatedly applying a reducing operation. If the
closure returns a failure, the failure is propagated back to the caller immediately. Read more
1.0.0 · source§fn all<F>(&mut self, f: F) -> bool
fn all<F>(&mut self, f: F) -> bool
Tests if every element of the iterator matches a predicate. Read more
1.0.0 · source§fn any<F>(&mut self, f: F) -> bool
fn any<F>(&mut self, f: F) -> bool
Tests if any element of the iterator matches a predicate. Read more
1.0.0 · source§fn find<P>(&mut self, predicate: P) -> Option<Self::Item>
fn find<P>(&mut self, predicate: P) -> Option<Self::Item>
Searches for an element of an iterator that satisfies a predicate. Read more
1.30.0 · source§fn find_map<B, F>(&mut self, f: F) -> Option<B>
fn find_map<B, F>(&mut self, f: F) -> Option<B>
Applies function to the elements of iterator and returns
the first non-none result. Read more
source§fn try_find<R>(
&mut self,
f: impl FnMut(&Self::Item) -> R,
) -> <<R as Try>::Residual as Residual<Option<Self::Item>>>::TryType
fn try_find<R>( &mut self, f: impl FnMut(&Self::Item) -> R, ) -> <<R as Try>::Residual as Residual<Option<Self::Item>>>::TryType
🔬This is a nightly-only experimental API. (
try_find
#63178)Applies function to the elements of iterator and returns
the first true result or the first error. Read more
1.0.0 · source§fn position<P>(&mut self, predicate: P) -> Option<usize>
fn position<P>(&mut self, predicate: P) -> Option<usize>
Searches for an element in an iterator, returning its index. Read more
1.6.0 · source§fn max_by_key<B, F>(self, f: F) -> Option<Self::Item>
fn max_by_key<B, F>(self, f: F) -> Option<Self::Item>
Returns the element that gives the maximum value from the
specified function. Read more
1.15.0 · source§fn max_by<F>(self, compare: F) -> Option<Self::Item>
fn max_by<F>(self, compare: F) -> Option<Self::Item>
Returns the element that gives the maximum value with respect to the
specified comparison function. Read more
1.6.0 · source§fn min_by_key<B, F>(self, f: F) -> Option<Self::Item>
fn min_by_key<B, F>(self, f: F) -> Option<Self::Item>
Returns the element that gives the minimum value from the
specified function. Read more
1.15.0 · source§fn min_by<F>(self, compare: F) -> Option<Self::Item>
fn min_by<F>(self, compare: F) -> Option<Self::Item>
Returns the element that gives the minimum value with respect to the
specified comparison function. Read more
1.0.0 · source§fn unzip<A, B, FromA, FromB>(self) -> (FromA, FromB)
fn unzip<A, B, FromA, FromB>(self) -> (FromA, FromB)
Converts an iterator of pairs into a pair of containers. Read more
1.36.0 · source§fn copied<'a, T>(self) -> Copied<Self> ⓘ
fn copied<'a, T>(self) -> Copied<Self> ⓘ
Creates an iterator which copies all of its elements. Read more
source§fn array_chunks<const N: usize>(self) -> ArrayChunks<Self, N> ⓘwhere
Self: Sized,
fn array_chunks<const N: usize>(self) -> ArrayChunks<Self, N> ⓘwhere
Self: Sized,
🔬This is a nightly-only experimental API. (
iter_array_chunks
#100450)Returns an iterator over
N
elements of the iterator at a time. Read more1.11.0 · source§fn product<P>(self) -> P
fn product<P>(self) -> P
Iterates over the entire iterator, multiplying all the elements Read more
source§fn cmp_by<I, F>(self, other: I, cmp: F) -> Ordering
fn cmp_by<I, F>(self, other: I, cmp: F) -> Ordering
🔬This is a nightly-only experimental API. (
iter_order_by
#64295)Lexicographically compares the elements of this
Iterator
with those
of another with respect to the specified comparison function. Read more1.5.0 · source§fn partial_cmp<I>(self, other: I) -> Option<Ordering>
fn partial_cmp<I>(self, other: I) -> Option<Ordering>
Lexicographically compares the
PartialOrd
elements of
this Iterator
with those of another. The comparison works like short-circuit
evaluation, returning a result without comparing the remaining elements.
As soon as an order can be determined, the evaluation stops and a result is returned. Read moresource§fn partial_cmp_by<I, F>(self, other: I, partial_cmp: F) -> Option<Ordering>where
Self: Sized,
I: IntoIterator,
F: FnMut(Self::Item, <I as IntoIterator>::Item) -> Option<Ordering>,
fn partial_cmp_by<I, F>(self, other: I, partial_cmp: F) -> Option<Ordering>where
Self: Sized,
I: IntoIterator,
F: FnMut(Self::Item, <I as IntoIterator>::Item) -> Option<Ordering>,
🔬This is a nightly-only experimental API. (
iter_order_by
#64295)Lexicographically compares the elements of this
Iterator
with those
of another with respect to the specified comparison function. Read moresource§fn eq_by<I, F>(self, other: I, eq: F) -> bool
fn eq_by<I, F>(self, other: I, eq: F) -> bool
🔬This is a nightly-only experimental API. (
iter_order_by
#64295)1.5.0 · source§fn lt<I>(self, other: I) -> bool
fn lt<I>(self, other: I) -> bool
Determines if the elements of this
Iterator
are lexicographically
less than those of another. Read more1.5.0 · source§fn le<I>(self, other: I) -> bool
fn le<I>(self, other: I) -> bool
Determines if the elements of this
Iterator
are lexicographically
less or equal to those of another. Read more1.5.0 · source§fn gt<I>(self, other: I) -> bool
fn gt<I>(self, other: I) -> bool
Determines if the elements of this
Iterator
are lexicographically
greater than those of another. Read more1.5.0 · source§fn ge<I>(self, other: I) -> bool
fn ge<I>(self, other: I) -> bool
Determines if the elements of this
Iterator
are lexicographically
greater than or equal to those of another. Read more1.83.0 · source§fn is_sorted_by<F>(self, compare: F) -> bool
fn is_sorted_by<F>(self, compare: F) -> bool
Checks if the elements of this iterator are sorted using the given comparator function. Read more
1.83.0 · source§fn is_sorted_by_key<F, K>(self, f: F) -> bool
fn is_sorted_by_key<F, K>(self, f: F) -> bool
Checks if the elements of this iterator are sorted using the given key extraction
function. Read more
Auto Trait Implementations§
impl<'a, T> Freeze for TryIter<'a, T>
impl<'a, T> RefUnwindSafe for TryIter<'a, T>
impl<'a, T> !Send for TryIter<'a, T>
impl<'a, T> !Sync for TryIter<'a, T>
impl<'a, T> Unpin for TryIter<'a, T>
impl<'a, T> UnwindSafe for TryIter<'a, T>
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more