KITFORMA · EDITORIAL GUIDE
Why does into_iter prevent later use of my vector?
KitForma editorial guide. For an owned vector, into_iter consumes ownership so it can yield owned elements. iter borrows elements, while iter_mut gives mutable borrowed access.
Step-by-step guidance
For an owned vector, into_iter consumes ownership so it can yield owned elements. iter borrows elements, while iter_mut gives mutable borrowed access.
Choose the iterator from the desired ownership contract. Use iter when retaining the container, and explicitly clone selected values only if separate ownership is needed. Use into_iter when dismantling the collection is the intended operation. Remember that method resolution can depend on the receiver type.
A complete example is:
fn main() {
let values = vec![2, 4, 6];
let sum: i32 = values.iter().sum();
assert_eq!(sum, 12);
assert_eq!(values.len(), 3);
}Borrowed iteration does not allow arbitrary structural mutation during the borrow.
Sources and verification
Sources checked:
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