Method next

publication/code/chapter06/hashmap.rs:204–206

(&mut self)

impl<'a, T> Iterator for Iter<'a, T> {
    type Item = &'a T;
    fn next(&mut self) -> Option<Self::Item> {
        self.stack.pop()
    }
}

struct IterMut<'a, T: 'a> { stack: Vec<&'a mut T>, }