1.0.0[−][src]Trait core::iter::IntoIterator
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());Run
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<i32>; 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); }Run
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() }Run
Associated Types
type Item
The type of the elements being iterated over.
type IntoIter: Iterator<Item = Self::Item>
Which kind of iterator are we turning this into?
Required methods
fn into_iter(self) -> Self::IntoIter
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());Run
Implementors
impl<'a, T> IntoIterator for &'a Option<T>[src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, A>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 0][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 1][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 2][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 3][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 4][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 5][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 6][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 7][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 8][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 9][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 10][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 11][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 12][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 13][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 14][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 15][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 16][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 17][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 18][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 19][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 20][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 21][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 22][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 23][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 24][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 25][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 26][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 27][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 28][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 29][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 30][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 31][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T; 32][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a [T][src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut Option<T>[src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, A>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 0][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 1][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 2][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 3][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 4][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 5][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 6][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 7][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 8][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 9][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 10][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 11][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 12][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 13][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 14][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 15][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 16][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 17][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 18][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 19][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 20][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 21][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 22][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 23][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 24][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 25][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 26][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 27][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 28][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 29][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 30][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 31][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T; 32][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T> IntoIterator for &'a mut [T][src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<'a, T, E> IntoIterator for &'a Result<T, E>[src]
type Item = &'a T
type IntoIter = Iter<'a, T>
ⓘImportant traits for Iter<'a, T>fn into_iter(self) -> Iter<'a, T>[src]
impl<'a, T, E> IntoIterator for &'a mut Result<T, E>[src]
type Item = &'a mut T
type IntoIter = IterMut<'a, T>
ⓘImportant traits for IterMut<'a, T>fn into_iter(self) -> IterMut<'a, T>[src]
impl<I: Iterator> IntoIterator for I[src]
impl<T> IntoIterator for Option<T>[src]
type Item = T
type IntoIter = IntoIter<T>
ⓘImportant traits for IntoIter<A>fn into_iter(self) -> IntoIter<T>[src]
impl<T, E> IntoIterator for Result<T, E>[src]
type Item = T
type IntoIter = IntoIter<T>
ⓘImportant traits for IntoIter<T>fn into_iter(self) -> IntoIter<T>[src]
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, []);Run