File: associated-types-doubleendediterator-object.rs

package info (click to toggle)
rustc 1.88.0%2Bdfsg1-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 934,128 kB
  • sloc: xml: 158,127; python: 36,062; javascript: 19,855; sh: 19,700; cpp: 18,947; ansic: 12,993; asm: 4,792; makefile: 690; lisp: 29; perl: 29; ruby: 19; sql: 11
file content (19 lines) | stat: -rw-r--r-- 452 bytes parent folder | download | duplicates (15) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
 
//@ run-pass

fn pairwise_sub(mut t: Box<dyn DoubleEndedIterator<Item=isize>>) -> isize {
    let mut result = 0;
    loop {
        let front = t.next();
        let back = t.next_back();
        match (front, back) {
            (Some(f), Some(b)) => { result += b - f; }
            _ => { return result; }
        }
    }
}

fn main() {
    let v = vec![1, 2, 3, 4, 5, 6];
    let r = pairwise_sub(Box::new(v.into_iter()));
    assert_eq!(r, 9);
}