How do I create a by-value iterator on the stack?

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I can create a consuming iterator in the heap:

vec![1, 10, 100].into_iter()

I can also create an iterator on the stack that borrows the elements:

[1, 10, 100].iter()

But if I write this:

[1, 10, 100].into_iter()

This is not a consuming iterator because [T; _]::into_iter does not exist: IntoIterator is only implemented for the borrowed version (aka slice). Is there a simple way (preferably in the std lib) to create a consuming iterator on the stack?

I know that [1, 10, 100].iter().cloned() can be done, but this requires the items to be clonable.

You can have a macro which wraps the values in a once iterator and chains them together:

macro_rules! value_iter {
    () => {
    ($v: expr, $( $rest: expr ), +) => {
    ($v: expr) => {


#[derive(Debug, PartialEq)]
struct Foo;

let it = value_iter![Foo, Foo, Foo];

let all: Vec<_> = it.collect();
assert_eq!(all, vec![Foo, Foo, Foo]);

A known drawback is that the iterator will not be an exact-size iterator, and so the compiler might miss some obvious optimizations.


Stack iterator() method in Java with Example, Return Value: The method iterates over the elements of the stack and returns the values(iterators). Creating an empty Stack + stack);. // Creating an iterator. Stack iterator() method in Java with Example The Java.util.Stack.iterator() method is used to return an iterator of the same elements as that of the Stack. The elements are returned in random order from what was present in the stack.

Is there a simple way (preferably in the std lib) to create a consuming iterator on the stack?


Is there a simple way (preferably in the std lib) to create a consuming iterator on the stack?

Yes. Use a crate like stack or smallvec, which provide array types that implement IntoIterator.

Algorithms: Algorithms_4, Solution: The stack does not overflow unless there exists an integer k such that the When creating an iterator, store this value as an Iterator instance variable. Stack listIterator() method in Java with Example The listIterator() method of Java.util.Stack class is used to return a list iterator over the elements in this stack (in proper sequence). The returned list iterator is fail-fast.

Very ugly, but technically works:

for s in [
].iter_mut().map(|option| option.take().unwrap()) {
    let s: String = s;
    println!("{}", s);

You can use a macro that achieves this in a prettier way:

macro_rules! iter {
    [ $( $item:expr ),+ ] => {{
        [ $( Some($item), )+ ]
        .map(|o| o.take().unwrap())
    // Rule to allow a trailing comma:
    [ $( $item:expr, )+ ] => {{
        iter![ $( $item ),+ ]

fn main() {
    for s in iter![String::from("hello"), String::from("goodbye")] {
        println!("{}", s);

Does it make sense to iterate a ranged for loop using constant , Is it best to iterate using constant reference as I have done? Or would iterating by value be better (data_type temp: vec). I'm asking for both writing  Before we begin, we encourage you to read below post that points out a bug in Stack class that causes stack elements to be printed in FIFO order instead of expected LILO order. For example, iterator() method on java.util.Stack iterates through a stack in bottom-up manner.

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