Struct std::result::IntoIter

1.0.0 · source ·

pub struct IntoIter<T> { /* private fields */ }

Expand description

An iterator over the value in a Ok variant of a Result.

The iterator yields one value if the result is Ok, otherwise none.

This struct is created by the into_iter method on Result (provided by the IntoIterator trait).

Trait Implementations

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impl<T> Clone for IntoIter<T> where
T: Clone,

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fn clone(&self) -> IntoIter<T>iNotable traits for IntoIter<T>impl<T> Iterator for IntoIter<T> type Item = T;

Returns a copy of the value. Read more

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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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impl<T> Debug for IntoIter<T> where
T: Debug,

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

Formats the value using the given formatter. Read more

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impl<T> DoubleEndedIterator for IntoIter<T>

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fn next_back(&mut self) -> Option<T>

Removes and returns an element from the end of the iterator. Read more

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fn advance_back_by(&mut self, n: usize) -> Result<(), usize>

🔬 This is a nightly-only experimental API. (iter_advance_by #77404)

Advances the iterator from the back by n elements. Read more

1.37.0 · source

fn nth_back(&mut self, n: usize) -> Option<Self::Item>

Returns the nth element from the end of the iterator. Read more

1.27.0 · source

fn try_rfold<B, F, R>(&mut self, init: B, f: F) -> R where
F: FnMut(B, Self::Item) -> R,
R: Try<Output = B>,

This is the reverse version of Iterator::try_fold(): it takes elements starting from the back of the iterator. Read more

1.27.0 · source

fn rfold<B, F>(self, init: B, f: F) -> B where
F: FnMut(B, Self::Item) -> B,

An iterator method that reduces the iterator’s elements to a single, final value, starting from the back. Read more

1.27.0 · source

fn rfind<P>(&mut self, predicate: P) -> Option<Self::Item> where
P: FnMut(&Self::Item) -> bool,

Searches for an element of an iterator from the back that satisfies a predicate. Read more

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impl<T> ExactSizeIterator for IntoIter<T>

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fn len(&self) -> usize

Returns the exact remaining length of the iterator. Read more

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fn is_empty(&self) -> bool

🔬 This is a nightly-only experimental API. (exact_size_is_empty #35428)

Returns true if the iterator is empty. Read more

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impl<T> Iterator for IntoIter<T>

type Item = T

The type of the elements being iterated over.

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fn next(&mut self) -> Option<T>

Advances the iterator and returns the next value. Read more

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

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

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fn next_chunk<const N: usize>(
&mut self
) -> Result<[Self::Item ; N], IntoIter<Self::Item, N>>

🔬 This is a nightly-only experimental API. (iter_next_chunk #98326)

Advances the iterator and returns an array containing the next N values. Read more

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fn count(self) -> usize

Consumes the iterator, counting the number of iterations and returning it. Read more

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fn last(self) -> Option<Self::Item>

Consumes the iterator, returning the last element. Read more

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fn advance_by(&mut self, n: usize) -> Result<(), usize>

🔬 This is a nightly-only experimental API. (iter_advance_by #77404)

Advances the iterator by n elements. Read more

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fn nth(&mut self, n: usize) -> Option<Self::Item>

Returns the nth element of the iterator. Read more

1.28.0 · source

fn step_by(self, step: usize) -> StepBy<Self>iNotable traits for StepBy<I>impl<I> Iterator for StepBy<I> where
I: Iterator, type Item = <I as Iterator>::Item;

Creates an iterator starting at the same point, but stepping by the given amount at each iteration. Read more

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fn chain<U>(self, other: U) -> Chain<Self, <U as IntoIterator>::IntoIter>iNotable traits for Chain<A, B>impl<A, B> Iterator for Chain<A, B> where
A: Iterator,
B: Iterator<Item = <A as Iterator>::Item>, type Item = <A as Iterator>::Item; where
U: IntoIterator<Item = Self::Item>,

Takes two iterators and creates a new iterator over both in sequence. Read more

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fn zip<U>(self, other: U) -> Zip<Self, <U as IntoIterator>::IntoIter>iNotable traits for Zip<A, B>impl<A, B> Iterator for Zip<A, B> where
A: Iterator,
B: Iterator, type Item = (<A as Iterator>::Item, <B as Iterator>::Item); where
U: IntoIterator,

‘Zips up’ two iterators into a single iterator of pairs. Read more

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fn intersperse(self, separator: Self::Item) -> Intersperse<Self>iNotable traits for Intersperse<I>impl<I> Iterator for Intersperse<I> where
I: Iterator,
<I as Iterator>::Item: Clone, type Item = <I as Iterator>::Item; where
Self::Item: Clone,

🔬 This is a nightly-only experimental API. (iter_intersperse #79524)

Creates a new iterator which places a copy of separator between adjacent items of the original iterator. Read more

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fn intersperse_with<G>(self, separator: G) -> IntersperseWith<Self, G>iNotable traits for IntersperseWith<I, G>impl<I, G> Iterator for IntersperseWith<I, G> where
I: Iterator,
G: FnMut() -> <I as Iterator>::Item, type Item = <I as Iterator>::Item; where
G: FnMut() -> Self::Item,

🔬 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 more

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fn map<B, F>(self, f: F) -> Map<Self, F>iNotable traits for Map<I, F>impl<B, I, F> Iterator for Map<I, F> where
I: Iterator,
F: FnMut(<I as Iterator>::Item) -> B, type Item = B; where
F: FnMut(Self::Item) -> B,

Takes a closure and creates an iterator which calls that closure on each element. Read more

1.21.0 · source

fn for_each<F>(self, f: F) where
F: FnMut(Self::Item),

Calls a closure on each element of an iterator. Read more

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fn filter<P>(self, predicate: P) -> Filter<Self, P>iNotable traits for Filter<I, P>impl<I, P> Iterator for Filter<I, P> where
I: Iterator,
P: FnMut(&<I as Iterator>::Item) -> bool, type Item = <I as Iterator>::Item; where
P: FnMut(&Self::Item) -> bool,

Creates an iterator which uses a closure to determine if an element should be yielded. Read more

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fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F>iNotable traits for FilterMap<I, F>impl<B, I, F> Iterator for FilterMap<I, F> where
I: Iterator,
F: FnMut(<I as Iterator>::Item) -> Option<B>, type Item = B; where
F: FnMut(Self::Item) -> Option<B>,

Creates an iterator that both filters and maps. Read more

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fn enumerate(self) -> Enumerate<Self>iNotable traits for Enumerate<I>impl<I> Iterator for Enumerate<I> where
I: Iterator, type Item = (usize, <I as Iterator>::Item);

Creates an iterator which gives the current iteration count as well as the next value. Read more

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fn peekable(self) -> Peekable<Self>iNotable traits for Peekable<I>impl<I> Iterator for Peekable<I> where
I: Iterator, type Item = <I as Iterator>::Item;

Creates an iterator which can use the peek and peek_mut methods to look at the next element of the iterator without consuming it. See their documentation for more information. Read more

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fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P>iNotable traits for SkipWhile<I, P>impl<I, P> Iterator for SkipWhile<I, P> where
I: Iterator,
P: FnMut(&<I as Iterator>::Item) -> bool, type Item = <I as Iterator>::Item; where
P: FnMut(&Self::Item) -> bool,

Creates an iterator that skips elements based on a predicate. Read more

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fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P>iNotable traits for TakeWhile<I, P>impl<I, P> Iterator for TakeWhile<I, P> where
I: Iterator,
P: FnMut(&<I as Iterator>::Item) -> bool, type Item = <I as Iterator>::Item; where
P: FnMut(&Self::Item) -> bool,

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>iNotable traits for MapWhile<I, P>impl<B, I, P> Iterator for MapWhile<I, P> where
I: Iterator,
P: FnMut(<I as Iterator>::Item) -> Option<B>, type Item = B; where
P: FnMut(Self::Item) -> Option<B>,

Creates an iterator that both yields elements based on a predicate and maps. Read more

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fn skip(self, n: usize) -> Skip<Self>iNotable traits for Skip<I>impl<I> Iterator for Skip<I> where
I: Iterator, type Item = <I as Iterator>::Item;

Creates an iterator that skips the first n elements. Read more

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fn take(self, n: usize) -> Take<Self>iNotable traits for Take<I>impl<I> Iterator for Take<I> where
I: Iterator, type Item = <I as Iterator>::Item;

Creates an iterator that yields the first n elements, or fewer if the underlying iterator ends sooner. Read more

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fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F>iNotable traits for Scan<I, St, F>impl<B, I, St, F> Iterator for Scan<I, St, F> where
I: Iterator,
F: FnMut(&mut St, <I as Iterator>::Item) -> Option<B>, type Item = B; where
F: FnMut(&mut St, Self::Item) -> Option<B>,

An iterator adapter similar to fold that holds internal state and produces a new iterator. Read more

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fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F>iNotable traits for FlatMap<I, U, F>impl<I, U, F> Iterator for FlatMap<I, U, F> where
I: Iterator,
U: IntoIterator,
F: FnMut(<I as Iterator>::Item) -> U, type Item = <U as IntoIterator>::Item; where
U: IntoIterator,
F: FnMut(Self::Item) -> U,

Creates an iterator that works like map, but flattens nested structure. Read more

1.29.0 · source

fn flatten(self) -> Flatten<Self>iNotable traits for Flatten<I>impl<I, U> Iterator for Flatten<I> where
I: Iterator,
U: Iterator,
<I as Iterator>::Item: IntoIterator,
<<I as Iterator>::Item as IntoIterator>::IntoIter == U,
<<I as Iterator>::Item as IntoIterator>::Item == <U as Iterator>::Item, type Item = <U as Iterator>::Item; where
Self::Item: IntoIterator,

Creates an iterator that flattens nested structure. Read more

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fn fuse(self) -> Fuse<Self>iNotable traits for Fuse<I>impl<I> Iterator for Fuse<I> where
I: Iterator, type Item = <I as Iterator>::Item;

Creates an iterator which ends after the first None. Read more

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fn inspect<F>(self, f: F) -> Inspect<Self, F>iNotable traits for Inspect<I, F>impl<I, F> Iterator for Inspect<I, F> where
I: Iterator,
F: FnMut(&<I as Iterator>::Item), type Item = <I as Iterator>::Item; where
F: FnMut(&Self::Item),

Does something with each element of an iterator, passing the value on. Read more

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fn by_ref(&mut self) -> &mut Self

Borrows an iterator, rather than consuming it. Read more

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fn collect<B>(self) -> B where
B: FromIterator<Self::Item>,

Transforms an iterator into a collection. Read more

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fn try_collect<B>(
&mut self
) -> <<Self::Item as Try>::Residual as Residual<B>>::TryType where
B: FromIterator<<Self::Item as Try>::Output>,
Self::Item: Try,
<Self::Item as Try>::Residual: Residual<B>,

🔬 This is a nightly-only experimental API. (iterator_try_collect #94047)

Fallibly transforms an iterator into a collection, short circuiting if a failure is encountered. Read more

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fn collect_into<E>(self, collection: &mut E) -> &mut E where
E: Extend<Self::Item>,

🔬 This is a nightly-only experimental API. (iter_collect_into #94780)

Collects all the items from an iterator into a collection. Read more

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fn partition<B, F>(self, f: F) -> (B, B) where
B: Default + Extend<Self::Item>,
F: FnMut(&Self::Item) -> bool,

Consumes an iterator, creating two collections from it. Read more

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fn partition_in_place<'a, T, P>(self, predicate: P) -> usize where
T: 'a,
Self: DoubleEndedIterator<Item = &'a mut T>,
P: FnMut(&T) -> bool,

🔬 This is a nightly-only experimental API. (iter_partition_in_place #62543)

Reorders the elements of this iterator in-place according to the given predicate, such that all those that return true precede all those that return false. Returns the number of true elements found. Read more

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fn is_partitioned<P>(self, predicate: P) -> bool where
P: FnMut(Self::Item) -> 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 more

1.27.0 · source

fn try_fold<B, F, R>(&mut self, init: B, f: F) -> R where
F: FnMut(B, Self::Item) -> R,
R: Try<Output = B>,

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 where
F: FnMut(Self::Item) -> R,
R: Try<Output = ()>,

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

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fn fold<B, F>(self, init: B, f: F) -> B where
F: FnMut(B, Self::Item) -> 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> where
F: FnMut(Self::Item, Self::Item) -> Self::Item,

Reduces the elements to a single one, by repeatedly applying a reducing operation. Read more

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fn try_reduce<F, R>(
&mut self,
f: F
) -> <<R as Try>::Residual as Residual<Option<<R as Try>::Output>>>::TryType where
F: FnMut(Self::Item, Self::Item) -> R,
R: Try<Output = Self::Item>,
<R as Try>::Residual: Residual<Option<Self::Item>>,

🔬 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

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fn all<F>(&mut self, f: F) -> bool where
F: FnMut(Self::Item) -> bool,

Tests if every element of the iterator matches a predicate. Read more

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fn any<F>(&mut self, f: F) -> bool where
F: FnMut(Self::Item) -> bool,

Tests if any element of the iterator matches a predicate. Read more

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fn find<P>(&mut self, predicate: P) -> Option<Self::Item> where
P: FnMut(&Self::Item) -> bool,

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> where
F: FnMut(Self::Item) -> Option<B>,

Applies function to the elements of iterator and returns the first non-none result. Read more

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fn try_find<F, R>(
&mut self,
f: F
) -> <<R as Try>::Residual as Residual<Option<Self::Item>>>::TryType where
F: FnMut(&Self::Item) -> R,
R: Try<Output = bool>,
<R as Try>::Residual: Residual<Option<Self::Item>>,

🔬 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

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fn position<P>(&mut self, predicate: P) -> Option<usize> where
P: FnMut(Self::Item) -> bool,

Searches for an element in an iterator, returning its index. Read more

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fn rposition<P>(&mut self, predicate: P) -> Option<usize> where
P: FnMut(Self::Item) -> bool,
Self: ExactSizeIterator + DoubleEndedIterator,

Searches for an element in an iterator from the right, returning its index. Read more

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fn max(self) -> Option<Self::Item> where
Self::Item: Ord,

Returns the maximum element of an iterator. Read more

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fn min(self) -> Option<Self::Item> where
Self::Item: Ord,

Returns the minimum element of an iterator. Read more

1.6.0 · source

fn max_by_key<B, F>(self, f: F) -> Option<Self::Item> where
B: Ord,
F: FnMut(&Self::Item) -> B,

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> where
F: FnMut(&Self::Item, &Self::Item) -> Ordering,

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> where
B: Ord,
F: FnMut(&Self::Item) -> B,

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> where
F: FnMut(&Self::Item, &Self::Item) -> Ordering,

Returns the element that gives the minimum value with respect to the specified comparison function. Read more

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fn rev(self) -> Rev<Self>iNotable traits for Rev<I>impl<I> Iterator for Rev<I> where
I: DoubleEndedIterator, type Item = <I as Iterator>::Item; where
Self: DoubleEndedIterator,

Reverses an iterator’s direction. Read more

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fn unzip<A, B, FromA, FromB>(self) -> (FromA, FromB) where
FromA: Default + Extend<A>,
FromB: Default + Extend<B>,
Self: Iterator<Item = (A, B)>,

Converts an iterator of pairs into a pair of containers. Read more

1.36.0 · source

fn copied<'a, T>(self) -> Copied<Self>iNotable traits for Copied<I>impl<'a, I, T> Iterator for Copied<I> where
T: 'a + Copy,
I: Iterator<Item = &'a T>, type Item = T; where
T: 'a + Copy,
Self: Iterator<Item = &'a T>,

Creates an iterator which copies all of its elements. Read more

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fn cloned<'a, T>(self) -> Cloned<Self>iNotable traits for Cloned<I>impl<'a, I, T> Iterator for Cloned<I> where
T: 'a + Clone,
I: Iterator<Item = &'a T>, type Item = T; where
T: 'a + Clone,
Self: Iterator<Item = &'a T>,

Creates an iterator which clones all of its elements. Read more

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fn cycle(self) -> Cycle<Self>iNotable traits for Cycle<I>impl<I> Iterator for Cycle<I> where
I: Clone + Iterator, type Item = <I as Iterator>::Item; where
Self: Clone,

Repeats an iterator endlessly. Read more

1.11.0 · source

fn sum<S>(self) -> S where
S: Sum<Self::Item>,

Sums the elements of an iterator. Read more

1.11.0 · source

fn product<P>(self) -> P where
P: Product<Self::Item>,

Iterates over the entire iterator, multiplying all the elements Read more

1.5.0 · source

fn cmp<I>(self, other: I) -> Ordering where
I: IntoIterator<Item = Self::Item>,
Self::Item: Ord,

Lexicographically compares the elements of this Iterator with those of another. Read more

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fn cmp_by<I, F>(self, other: I, cmp: F) -> Ordering where
I: IntoIterator,
F: FnMut(Self::Item, <I as IntoIterator>::Item) -> 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 more

1.5.0 · source

fn partial_cmp<I>(self, other: I) -> Option<Ordering> where
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,

Lexicographically compares the elements of this Iterator with those of another. Read more

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fn partial_cmp_by<I, F>(self, other: I, partial_cmp: F) -> Option<Ordering> where
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 more

1.5.0 · source

fn eq<I>(self, other: I) -> bool where
I: IntoIterator,
Self::Item: PartialEq<<I as IntoIterator>::Item>,

Determines if the elements of this Iterator are equal to those of another. Read more

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fn eq_by<I, F>(self, other: I, eq: F) -> bool where
I: IntoIterator,
F: FnMut(Self::Item, <I as IntoIterator>::Item) -> bool,

🔬 This is a nightly-only experimental API. (iter_order_by #64295)

Determines if the elements of this Iterator are equal to those of another with respect to the specified equality function. Read more

1.5.0 · source

fn ne<I>(self, other: I) -> bool where
I: IntoIterator,
Self::Item: PartialEq<<I as IntoIterator>::Item>,

Determines if the elements of this Iterator are unequal to those of another. Read more

1.5.0 · source

fn lt<I>(self, other: I) -> bool where
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,

Determines if the elements of this Iterator are lexicographically less than those of another. Read more

1.5.0 · source

fn le<I>(self, other: I) -> bool where
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,

Determines if the elements of this Iterator are lexicographically less or equal to those of another. Read more

1.5.0 · source

fn gt<I>(self, other: I) -> bool where
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,

Determines if the elements of this Iterator are lexicographically greater than those of another. Read more

1.5.0 · source

fn ge<I>(self, other: I) -> bool where
I: IntoIterator,
Self::Item: PartialOrd<<I as IntoIterator>::Item>,

Determines if the elements of this Iterator are lexicographically greater than or equal to those of another. Read more

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fn is_sorted(self) -> bool where
Self::Item: PartialOrd<Self::Item>,

🔬 This is a nightly-only experimental API. (is_sorted #53485)

Checks if the elements of this iterator are sorted. Read more

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fn is_sorted_by<F>(self, compare: F) -> bool where
F: FnMut(&Self::Item, &Self::Item) -> Option<Ordering>,

🔬 This is a nightly-only experimental API. (is_sorted #53485)

Checks if the elements of this iterator are sorted using the given comparator function. Read more

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fn is_sorted_by_key<F, K>(self, f: F) -> bool where
F: FnMut(Self::Item) -> K,
K: PartialOrd<K>,

🔬 This is a nightly-only experimental API. (is_sorted #53485)

Checks if the elements of this iterator are sorted using the given key extraction function. Read more

1.26.0 · source

impl<T> FusedIterator for IntoIter<T>

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impl<A> TrustedLen for IntoIter<A>