blob: 1d28ca6b7fdc59d9be8e81638d1f1f365f3d9206 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
|
use core::iter::*;
#[test]
fn test_iterator_scan() {
// test the type inference
fn add(old: &mut isize, new: &usize) -> Option<f64> {
*old += *new as isize;
Some(*old as f64)
}
let xs = [0, 1, 2, 3, 4];
let ys = [0f64, 1.0, 3.0, 6.0, 10.0];
let it = xs.iter().scan(0, add);
let mut i = 0;
for x in it {
assert_eq!(x, ys[i]);
i += 1;
}
assert_eq!(i, ys.len());
}
|