1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
use core::iter::*;
#[test]
fn test_inspect() {
let xs = [1, 2, 3, 4];
let mut n = 0;
let ys = xs.iter().cloned().inspect(|_| n += 1).collect::<Vec<usize>>();
assert_eq!(n, xs.len());
assert_eq!(&xs[..], &ys[..]);
}
#[test]
fn test_inspect_fold() {
let xs = [1, 2, 3, 4];
let mut n = 0;
{
let it = xs.iter().inspect(|_| n += 1);
let i = it.fold(0, |i, &x| {
assert_eq!(x, xs[i]);
i + 1
});
assert_eq!(i, xs.len());
}
assert_eq!(n, xs.len());
let mut n = 0;
{
let it = xs.iter().inspect(|_| n += 1);
let i = it.rfold(xs.len(), |i, &x| {
assert_eq!(x, xs[i - 1]);
i - 1
});
assert_eq!(i, 0);
}
assert_eq!(n, xs.len());
}
|
