# [−][src]Struct actix_web::http::header::IntoIter

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

An owning iterator over the entries of a `HeaderMap`.

This struct is created by the `into_iter` method on `HeaderMap`.

## Trait Implementations

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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>`

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Formats the value using the given formatter. Read more

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`impl<T> Drop for IntoIter<T>`

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`fn drop(&mut self)`

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Executes the destructor for this type. Read more

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`impl<T> Iterator for IntoIter<T>`

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#### `type Item = (Option<HeaderName>, T)`

The type of the elements being iterated over.

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`fn next(&mut self) -> Option<<IntoIter<T> as Iterator>::Item>`

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Advances the iterator and returns the next value. Read more

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

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

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`fn count(self) -> usize`

1.0.0
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Consumes the iterator, counting the number of iterations and returning it. Read more

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

1.0.0
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Consumes the iterator, returning the last element. Read more

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

1.0.0
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Returns the `n`th element of the iterator. Read more

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`fn step_by(self, step: usize) -> StepBy<Self>`

1.28.0
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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> where U: IntoIterator<Item = Self::Item>,`

1.0.0
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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> where U: IntoIterator,`

1.0.0
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'Zips up' two iterators into a single iterator of pairs. Read more

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`fn map<B, F>(self, f: F) -> Map<Self, F> where F: FnMut(Self::Item) -> B,`

1.0.0
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Takes a closure and creates an iterator which calls that closure on each element. Read more

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

1.21.0
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Calls a closure on each element of an iterator. Read more

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`fn filter<P>(self, predicate: P) -> Filter<Self, P> where P: FnMut(&Self::Item) -> bool,`

1.0.0
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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> where F: FnMut(Self::Item) -> Option<B>,`

1.0.0
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Creates an iterator that both filters and maps. Read more

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`fn enumerate(self) -> Enumerate<Self>`

1.0.0
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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>`

1.0.0
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Creates an iterator which can use `peek` to look at the next element of the iterator without consuming it. Read more

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`fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P> where P: FnMut(&Self::Item) -> bool,`

1.0.0
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Creates an iterator that [`skip`]s elements based on a predicate. Read more

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`fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P> where P: FnMut(&Self::Item) -> bool,`

1.0.0
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Creates an iterator that yields elements based on a predicate. Read more

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`fn skip(self, n: usize) -> Skip<Self>`

1.0.0
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Creates an iterator that skips the first `n` elements. Read more

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`fn take(self, n: usize) -> Take<Self>`

1.0.0
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Creates an iterator that yields its first `n` elements. Read more

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`fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F> where F: FnMut(&mut St, Self::Item) -> Option<B>,`

1.0.0
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An iterator adaptor 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> where F: FnMut(Self::Item) -> U, U: IntoIterator,`

1.0.0
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Creates an iterator that works like map, but flattens nested structure. Read more

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`fn flatten(self) -> Flatten<Self> where Self::Item: IntoIterator,`

1.29.0
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Creates an iterator that flattens nested structure. Read more

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`fn fuse(self) -> Fuse<Self>`

1.0.0
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Creates an iterator which ends after the first [`None`]. Read more

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`fn inspect<F>(self, f: F) -> Inspect<Self, F> where F: FnMut(&Self::Item),`

1.0.0
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Do something with each element of an iterator, passing the value on. Read more

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

1.0.0
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Borrows an iterator, rather than consuming it. Read more

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`#[must_use = "if you really need to exhaust the iterator, consider `.for_each(drop)` instead"] fn collect<B>(self) -> B where B: FromIterator<Self::Item>,`

1.0.0
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Transforms 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,`

1.0.0
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Consumes an iterator, creating two collections from it. Read more

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

1.27.0
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An iterator method that applies a function as long as it returns successfully, producing a single, final value. Read more

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`fn try_for_each<F, R>(&mut self, f: F) -> R where F: FnMut(Self::Item) -> R, R: Try<Ok = ()>,`

1.27.0
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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,`

1.0.0
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An iterator method that applies a function, producing a single, final value. Read more

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

1.0.0
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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,`

1.0.0
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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,`

1.0.0
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Searches for an element of an iterator that satisfies a predicate. Read more

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`fn find_map<B, F>(&mut self, f: F) -> Option<B> where F: FnMut(Self::Item) -> Option<B>,`

1.30.0
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Applies function to the elements of iterator and returns the first non-none result. Read more

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

1.0.0
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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,`

1.0.0
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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,`

1.0.0
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Returns the maximum element of an iterator. Read more

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

1.0.0
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Returns the minimum element of an iterator. Read more

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

1.6.0
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Returns the element that gives the maximum value from the specified function. Read more

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

1.15.0
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Returns the element that gives the maximum value with respect to the specified comparison function. Read more

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

1.6.0
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Returns the element that gives the minimum value from the specified function. Read more

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

1.15.0
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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> where Self: DoubleEndedIterator,`

1.0.0
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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)>,`

1.0.0
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Converts an iterator of pairs into a pair of containers. Read more

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`fn cloned<'a, T>(self) -> Cloned<Self> where Self: Iterator<Item = &'a T>, T: 'a + Clone,`

1.0.0
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Creates an iterator which [`clone`]s all of its elements. Read more

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`fn cycle(self) -> Cycle<Self> where Self: Clone,`

1.0.0
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Repeats an iterator endlessly. Read more

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

1.11.0
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Sums the elements of an iterator. Read more

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

1.11.0
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Iterates over the entire iterator, multiplying all the elements Read more

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

1.5.0
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Lexicographically compares the elements of this `Iterator` with those of another. Read more

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

1.5.0
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Lexicographically compares the elements of this `Iterator` with those of another. Read more

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

1.5.0
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Determines if the elements of this `Iterator` are equal to those of another. Read more

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

1.5.0
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Determines if the elements of this `Iterator` are unequal to those of another. Read more

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

1.5.0
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Determines if the elements of this `Iterator` are lexicographically less than those of another. Read more

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

1.5.0
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Determines if the elements of this `Iterator` are lexicographically less or equal to those of another. Read more

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

1.5.0
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Determines if the elements of this `Iterator` are lexicographically greater than those of another. Read more

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

1.5.0
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Determines if the elements of this `Iterator` are lexicographically greater than or equal to those of another. Read more

## Auto Trait Implementations

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`impl<T> Send for IntoIter<T> where T: Send,`

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`impl<T> Sync for IntoIter<T> where T: Sync,`

## Blanket Implementations

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`impl<T> From for T`

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`fn from(t: T) -> T`

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Performs the conversion.

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`impl<I> IntoIterator for I where I: Iterator,`

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#### `type Item = <I as Iterator>::Item`

The type of the elements being iterated over.

#### `type IntoIter = I`

Which kind of iterator are we turning this into?

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`fn into_iter(self) -> I`

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Creates an iterator from a value. Read more

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`impl<T, U> Into for T where U: From<T>,`

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####

`fn into(self) -> U`

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Performs the conversion.

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`impl<T, U> TryFrom for T where T: From<U>,`

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#### `type Error = !`

🔬 This is a nightly-only experimental API. (`try_from`)

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>`

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🔬 This is a nightly-only experimental API. (`try_from`)

Performs the conversion.

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

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`fn borrow(&self) -> &T`

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Immutably borrows from an owned value. Read more

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`impl<T> BorrowMut for T where T: ?Sized,`

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`fn borrow_mut(&mut self) -> &mut T`

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Mutably borrows from an owned value. Read more

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`impl<T, U> TryInto for T where U: TryFrom<T>,`

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

🔬 This is a nightly-only experimental API. (`try_from`)

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>`

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🔬 This is a nightly-only experimental API. (`try_from`)

Performs the conversion.

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

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`fn get_type_id(&self) -> TypeId`

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🔬 This is a nightly-only experimental API. (`get_type_id`)

this method will likely be replaced by an associated static

Gets the `TypeId` of `self`. Read more

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`impl<T> Erased for T`

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