IntoIterator

trait IntoIterator<T>

A type that can be turned into an Iterator, which makes it usable in for x in value.

into_iter returns the iterator (IntoIter), whose Item must match. A class that is its own iterator returns itself. See Iterator for a full example.

Associated types#

• type Item
• type IntoIter

Required methods#

Examples#

use tests::assert;
class Ones {
    pub left: int,
}

impl Iterator for Ones {
    type Item = int;
    pub fn next(Ones o) -> Option<int> {
        if o.left == 0 {
            return Option::None;
        }
        o.left = o.left - 1;
        return Option::Some(1);
    }
}

impl IntoIterator for Ones {
    type Item = int;
    type IntoIter = Ones;
    pub fn into_iter(Ones o) -> Ones {
        return o;
    }
}

fn main() {
    let n = 0;
    for x in new Ones(4) {
        n = n + x;
    }
    assert!(n == 4);
}

See also#

• Iterator
• IntoIterator::into_iter