Trait nom::lib::std::iter::IntoIterator 1.0.0[−][src]
Conversion into an Iterator
.
By implementing IntoIterator
for a type, you define how it will be
converted to an iterator. This is common for types which describe a
collection of some kind.
One benefit of implementing IntoIterator
is that your type will work
with Rust's for
loop syntax.
See also: FromIterator
.
Examples
Basic usage:
let v = vec![1, 2, 3]; let mut iter = v.into_iter(); assert_eq!(Some(1), iter.next()); assert_eq!(Some(2), iter.next()); assert_eq!(Some(3), iter.next()); assert_eq!(None, iter.next());
Implementing IntoIterator
for your type:
// A sample collection, that's just a wrapper over Vec<T> #[derive(Debug)] struct MyCollection(Vec<i32>); // Let's give it some methods so we can create one and add things // to it. impl MyCollection { fn new() -> MyCollection { MyCollection(Vec::new()) } fn add(&mut self, elem: i32) { self.0.push(elem); } } // and we'll implement IntoIterator impl IntoIterator for MyCollection { type Item = i32; type IntoIter = std::vec::IntoIter<Self::Item>; fn into_iter(self) -> Self::IntoIter { self.0.into_iter() } } // Now we can make a new collection... let mut c = MyCollection::new(); // ... add some stuff to it ... c.add(0); c.add(1); c.add(2); // ... and then turn it into an Iterator: for (i, n) in c.into_iter().enumerate() { assert_eq!(i as i32, n); }
It is common to use IntoIterator
as a trait bound. This allows
the input collection type to change, so long as it is still an
iterator. Additional bounds can be specified by restricting on
Item
:
fn collect_as_strings<T>(collection: T) -> Vec<String> where T: IntoIterator, T::Item: std::fmt::Debug, { collection .into_iter() .map(|item| format!("{:?}", item)) .collect() }
Associated Types
type Item
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The type of the elements being iterated over.
type IntoIter: Iterator
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Which kind of iterator are we turning this into?
Required methods
#[lang = "into_iter"]pub fn into_iter(self) -> Self::IntoIter
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Creates an iterator from a value.
See the module-level documentation for more.
Examples
Basic usage:
let v = vec![1, 2, 3]; let mut iter = v.into_iter(); assert_eq!(Some(1), iter.next()); assert_eq!(Some(2), iter.next()); assert_eq!(Some(3), iter.next()); assert_eq!(None, iter.next());
Implementations on Foreign Types
impl<'a, T> IntoIterator for &'a Receiver<T>
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impl<'a> IntoIterator for &'a PathBuf
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impl<'a> IntoIterator for &'a Path
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impl<T> IntoIterator for Receiver<T>
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impl<'a, T> IntoIterator for &'a mut [T]
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impl<'a, T, const N: usize> IntoIterator for &'a mut [T; N]
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impl<'a, T, const N: usize> IntoIterator for &'a [T; N]
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impl<'a, T> IntoIterator for &'a [T]
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impl<'a, O, T> IntoIterator for &'a mut BitVec<O, T> where
O: 'a + BitOrder,
T: 'a + BitStore,
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O: 'a + BitOrder,
T: 'a + BitStore,
type IntoIter = <&'a mut BitSlice<O, T> as IntoIterator>::IntoIter
type Item = <&'a mut BitSlice<O, T> as IntoIterator>::Item
pub fn into_iter(self) -> <&'a mut BitVec<O, T> as IntoIterator>::IntoIter
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impl<'a, O, T> IntoIterator for &'a mut BitSlice<O, T> where
O: 'a + BitOrder,
T: 'a + BitStore,
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O: 'a + BitOrder,
T: 'a + BitStore,
type IntoIter = IterMut<'a, O, T>
type Item = <<&'a mut BitSlice<O, T> as IntoIterator>::IntoIter as Iterator>::Item
pub fn into_iter(self) -> <&'a mut BitSlice<O, T> as IntoIterator>::IntoIter
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impl<'a, O, T> IntoIterator for &'a BitSlice<O, T> where
O: 'a + BitOrder,
T: 'a + BitStore,
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O: 'a + BitOrder,
T: 'a + BitStore,
type IntoIter = Iter<'a, O, T>
type Item = <<&'a BitSlice<O, T> as IntoIterator>::IntoIter as Iterator>::Item
pub fn into_iter(self) -> <&'a BitSlice<O, T> as IntoIterator>::IntoIter
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impl<'a, O, V> IntoIterator for &'a mut BitArray<O, V> where
O: 'a + BitOrder,
V: 'a + BitView,
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O: 'a + BitOrder,
V: 'a + BitView,
type IntoIter = <&'a mut BitSlice<O, <V as BitView>::Store> as IntoIterator>::IntoIter
type Item = <&'a mut BitSlice<O, <V as BitView>::Store> as IntoIterator>::Item
pub fn into_iter(self) -> <&'a mut BitArray<O, V> as IntoIterator>::IntoIter
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impl<O, T> IntoIterator for BitVec<O, T> where
O: 'static + BitOrder,
T: 'static + BitStore,
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O: 'static + BitOrder,
T: 'static + BitStore,
type IntoIter = IntoIter<O, T>
type Item = bool
pub fn into_iter(self) -> <BitVec<O, T> as IntoIterator>::IntoIter
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impl<'a, O, V> IntoIterator for &'a BitArray<O, V> where
O: 'a + BitOrder,
V: 'a + BitView,
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O: 'a + BitOrder,
V: 'a + BitView,
type IntoIter = <&'a BitSlice<O, <V as BitView>::Store> as IntoIterator>::IntoIter
type Item = <&'a BitSlice<O, <V as BitView>::Store> as IntoIterator>::Item
pub fn into_iter(self) -> <&'a BitArray<O, V> as IntoIterator>::IntoIter
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impl<'a, O, T> IntoIterator for &'a BitVec<O, T> where
O: 'a + BitOrder,
T: 'a + BitStore,
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O: 'a + BitOrder,
T: 'a + BitStore,
type IntoIter = <&'a BitSlice<O, T> as IntoIterator>::IntoIter
type Item = <&'a BitSlice<O, T> as IntoIterator>::Item
pub fn into_iter(self) -> <&'a BitVec<O, T> as IntoIterator>::IntoIter
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impl<'a, A> IntoIterator for &'a ArrayVec<A> where
A: Array,
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A: Array,
Iterate the ArrayVec
with references to each element.
use arrayvec::ArrayVec; let array = ArrayVec::from([1, 2, 3]); for elt in &array { // ... }
type Item = &'a <A as Array>::Item
type IntoIter = Iter<'a, <A as Array>::Item>
pub fn into_iter(self) -> <&'a ArrayVec<A> as IntoIterator>::IntoIter
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impl<'a, A> IntoIterator for &'a mut ArrayVec<A> where
A: Array,
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A: Array,
Iterate the ArrayVec
with mutable references to each element.
use arrayvec::ArrayVec; let mut array = ArrayVec::from([1, 2, 3]); for elt in &mut array { // ... }
type Item = &'a mut <A as Array>::Item
type IntoIter = IterMut<'a, <A as Array>::Item>
pub fn into_iter(self) -> <&'a mut ArrayVec<A> as IntoIterator>::IntoIter
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impl<A> IntoIterator for ArrayVec<A> where
A: Array,
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A: Array,
Iterate the ArrayVec
with each element by value.
The vector is consumed by this operation.
use arrayvec::ArrayVec; for elt in ArrayVec::from([1, 2, 3]) { // ... }
type Item = <A as Array>::Item
type IntoIter = IntoIter<A>
pub fn into_iter(self) -> IntoIter<A>ⓘ
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impl<'a> IntoIterator for &'a SetMatches
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type IntoIter = SetMatchesIter<'a>
type Item = usize
pub fn into_iter(self) -> <&'a SetMatches as IntoIterator>::IntoIter
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impl IntoIterator for SetMatches
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type IntoIter = SetMatchesIntoIter
type Item = usize
pub fn into_iter(self) -> <SetMatches as IntoIterator>::IntoIter
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impl IntoIterator for SetMatches
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type IntoIter = SetMatchesIntoIter
type Item = usize
pub fn into_iter(self) -> <SetMatches as IntoIterator>::IntoIter
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impl<'a> IntoIterator for &'a SetMatches
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type IntoIter = SetMatchesIter<'a>
type Item = usize
pub fn into_iter(self) -> <&'a SetMatches as IntoIterator>::IntoIter
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impl<'a> IntoIterator for &'a Utf8Sequence
type IntoIter = Iter<'a, Utf8Range>
type Item = &'a Utf8Range
pub fn into_iter(self) -> <&'a Utf8Sequence as IntoIterator>::IntoIter
impl<'a, T> IntoIterator for &'a mut CachedThreadLocal<T> where
T: 'a + Send,
T: 'a + Send,
type Item = &'a mut T
type IntoIter = CachedIterMut<'a, T>
pub fn into_iter(self) -> CachedIterMut<'a, T>ⓘ
impl<T> IntoIterator for CachedThreadLocal<T> where
T: Send,
T: Send,
impl<'a, T> IntoIterator for &'a mut ThreadLocal<T> where
T: Send,
T: Send,
impl<'a, T> IntoIterator for &'a ThreadLocal<T> where
T: Send + Sync,
T: Send + Sync,
type Item = &'a T
type IntoIter = Iter<'a, T>
pub fn into_iter(self) -> <&'a ThreadLocal<T> as IntoIterator>::IntoIter
impl<T> IntoIterator for ThreadLocal<T> where
T: Send,
Loading content...T: Send,
Implementors
impl<'a, K, V> IntoIterator for &'a BTreeMap<K, V>
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type Item = (&'a K, &'a V)
type IntoIter = Iter<'a, K, V>
pub fn into_iter(self) -> Iter<'a, K, V>ⓘ
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impl<'a, K, V> IntoIterator for &'a mut BTreeMap<K, V>
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type Item = (&'a K, &'a mut V)
type IntoIter = IterMut<'a, K, V>
pub fn into_iter(self) -> IterMut<'a, K, V>ⓘ
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impl<'a, K, V, S> IntoIterator for &'a HashMap<K, V, S>
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type Item = (&'a K, &'a V)
type IntoIter = Iter<'a, K, V>
pub fn into_iter(self) -> Iter<'a, K, V>ⓘ
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impl<'a, K, V, S> IntoIterator for &'a mut HashMap<K, V, S>
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type Item = (&'a K, &'a mut V)
type IntoIter = IterMut<'a, K, V>
pub fn into_iter(self) -> IterMut<'a, K, V>ⓘ
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impl<'a, T> IntoIterator for &'a Option<T>
1.4.0[src]
impl<'a, T> IntoIterator for &'a BTreeSet<T>
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impl<'a, T> IntoIterator for &'a BinaryHeap<T>
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impl<'a, T> IntoIterator for &'a LinkedList<T>
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impl<'a, T> IntoIterator for &'a VecDeque<T>
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impl<'a, T> IntoIterator for &'a mut Option<T>
1.4.0[src]
impl<'a, T> IntoIterator for &'a mut LinkedList<T>
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impl<'a, T> IntoIterator for &'a mut VecDeque<T>
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impl<'a, T, A> IntoIterator for &'a Vec<T, A> where
A: Allocator,
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A: Allocator,
impl<'a, T, A> IntoIterator for &'a mut Vec<T, A> where
A: Allocator,
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A: Allocator,
impl<'a, T, E> IntoIterator for &'a Result<T, E>
1.4.0[src]
impl<'a, T, E> IntoIterator for &'a mut Result<T, E>
1.4.0[src]
impl<'a, T, S> IntoIterator for &'a HashSet<T, S>
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impl<I> IntoIterator for I where
I: Iterator,
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I: Iterator,
impl<K, V> IntoIterator for BTreeMap<K, V>
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impl<K, V, S> IntoIterator for HashMap<K, V, S>
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type Item = (K, V)
type IntoIter = IntoIter<K, V>
pub fn into_iter(self) -> IntoIter<K, V>ⓘ
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Creates a consuming iterator, that is, one that moves each key-value pair out of the map in arbitrary order. The map cannot be used after calling this.
Examples
use std::collections::HashMap; let mut map = HashMap::new(); map.insert("a", 1); map.insert("b", 2); map.insert("c", 3); // Not possible with .iter() let vec: Vec<(&str, i32)> = map.into_iter().collect();
impl<T> IntoIterator for Option<T>
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type Item = T
type IntoIter = IntoIter<T>
pub fn into_iter(self) -> IntoIter<T>ⓘ
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Returns a consuming iterator over the possibly contained value.
Examples
let x = Some("string"); let v: Vec<&str> = x.into_iter().collect(); assert_eq!(v, ["string"]); let x = None; let v: Vec<&str> = x.into_iter().collect(); assert!(v.is_empty());
impl<T> IntoIterator for BTreeSet<T>
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type Item = T
type IntoIter = IntoIter<T>
pub fn into_iter(self) -> IntoIter<T>ⓘ
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Gets an iterator for moving out the BTreeSet
's contents.
Examples
use std::collections::BTreeSet; let set: BTreeSet<usize> = [1, 2, 3, 4].iter().cloned().collect(); let v: Vec<_> = set.into_iter().collect(); assert_eq!(v, [1, 2, 3, 4]);
impl<T> IntoIterator for BinaryHeap<T>
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type Item = T
type IntoIter = IntoIter<T>
pub fn into_iter(self) -> IntoIter<T>ⓘ
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Creates a consuming iterator, that is, one that moves each value out of the binary heap in arbitrary order. The binary heap cannot be used after calling this.
Examples
Basic usage:
use std::collections::BinaryHeap; let heap = BinaryHeap::from(vec![1, 2, 3, 4]); // Print 1, 2, 3, 4 in arbitrary order for x in heap.into_iter() { // x has type i32, not &i32 println!("{}", x); }
impl<T> IntoIterator for LinkedList<T>
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type Item = T
type IntoIter = IntoIter<T>
pub fn into_iter(self) -> IntoIter<T>ⓘ
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Consumes the list into an iterator yielding elements by value.
impl<T> IntoIterator for VecDeque<T>
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type Item = T
type IntoIter = IntoIter<T>
pub fn into_iter(self) -> IntoIter<T>ⓘ
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Consumes the VecDeque
into a front-to-back iterator yielding elements by
value.
impl<T, A> IntoIterator for Vec<T, A> where
A: Allocator,
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A: Allocator,
type Item = T
type IntoIter = IntoIter<T, A>
pub fn into_iter(self) -> IntoIter<T, A>ⓘ
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Creates a consuming iterator, that is, one that moves each value out of the vector (from start to end). The vector cannot be used after calling this.
Examples
let v = vec!["a".to_string(), "b".to_string()]; for s in v.into_iter() { // s has type String, not &String println!("{}", s); }
impl<T, E> IntoIterator for Result<T, E>
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type Item = T
type IntoIter = IntoIter<T>
pub fn into_iter(self) -> IntoIter<T>ⓘ
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Returns a consuming iterator over the possibly contained value.
The iterator yields one value if the result is Result::Ok
, otherwise none.
Examples
Basic usage:
let x: Result<u32, &str> = Ok(5); let v: Vec<u32> = x.into_iter().collect(); assert_eq!(v, [5]); let x: Result<u32, &str> = Err("nothing!"); let v: Vec<u32> = x.into_iter().collect(); assert_eq!(v, []);
impl<T, S> IntoIterator for HashSet<T, S>
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type Item = T
type IntoIter = IntoIter<T>
pub fn into_iter(self) -> IntoIter<T>ⓘ
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Creates a consuming iterator, that is, one that moves each value out of the set in arbitrary order. The set cannot be used after calling this.
Examples
use std::collections::HashSet; let mut set = HashSet::new(); set.insert("a".to_string()); set.insert("b".to_string()); // Not possible to collect to a Vec<String> with a regular `.iter()`. let v: Vec<String> = set.into_iter().collect(); // Will print in an arbitrary order. for x in &v { println!("{}", x); }