iterator_basic.ko

// Basic iterator protocol usage.
// Phase 47 feature — Iterator protocol with list_iter/advance/value/free.

module iterator_basic {
    meta {
        version: "1.0.0"
        purpose: "Demonstrates the Iterator protocol on List<Int>"
        author: "Kodo Team"
    }

    fn sum_via_iterator(items: List<Int>) -> Int {
        let mut total: Int = 0
        let iter: Int = list_iter(items)
        while list_iterator_advance(iter) > 0 {
            let val: Int = list_iterator_value(iter)
            total = total + val
        }
        list_iterator_free(iter)
        return total
    }

    fn count_items(items: List<Int>) -> Int {
        let mut count: Int = 0
        let iter: Int = list_iter(items)
        while list_iterator_advance(iter) > 0 {
            let _val: Int = list_iterator_value(iter)
            count = count + 1
        }
        list_iterator_free(iter)
        return count
    }

    fn main() -> Int {
        let nums: List<Int> = list_new()
        list_push(nums, 10)
        list_push(nums, 20)
        list_push(nums, 30)

        let total: Int = sum_via_iterator(nums)
        print_int(total)

        let n: Int = count_items(nums)
        print_int(n)

        return 0
    }
}