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
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
use itertools::Itertools;
use itertools::{put_back, put_back_n};
#[test]
fn peeking_take_while_peekable() {
let mut r = (0..10).peekable();
r.peeking_take_while(|x| *x <= 3).count();
assert_eq!(r.next(), Some(4));
}
#[test]
fn peeking_take_while_put_back() {
let mut r = put_back(0..10);
r.peeking_take_while(|x| *x <= 3).count();
assert_eq!(r.next(), Some(4));
r.peeking_take_while(|_| true).count();
assert_eq!(r.next(), None);
}
#[test]
fn peeking_take_while_put_back_n() {
let mut r = put_back_n(6..10);
for elt in (0..6).rev() {
r.put_back(elt);
}
r.peeking_take_while(|x| *x <= 3).count();
assert_eq!(r.next(), Some(4));
r.peeking_take_while(|_| true).count();
assert_eq!(r.next(), None);
}
#[test]
fn peeking_take_while_slice_iter() {
let v = [1, 2, 3, 4, 5, 6];
let mut r = v.iter();
r.peeking_take_while(|x| **x <= 3).count();
assert_eq!(r.next(), Some(&4));
r.peeking_take_while(|_| true).count();
assert_eq!(r.next(), None);
}
#[test]
fn peeking_take_while_slice_iter_rev() {
let v = [1, 2, 3, 4, 5, 6];
let mut r = v.iter().rev();
r.peeking_take_while(|x| **x >= 3).count();
assert_eq!(r.next(), Some(&2));
r.peeking_take_while(|_| true).count();
assert_eq!(r.next(), None);
}
#[test]
fn peeking_take_while_nested() {
let mut xs = (0..10).peekable();
let ys: Vec<_> = xs
.peeking_take_while(|x| *x < 6)
.peeking_take_while(|x| *x != 3)
.collect();
assert_eq!(ys, vec![0, 1, 2]);
assert_eq!(xs.next(), Some(3));
let mut xs = (4..10).peekable();
let ys: Vec<_> = xs
.peeking_take_while(|x| *x != 3)
.peeking_take_while(|x| *x < 6)
.collect();
assert_eq!(ys, vec![4, 5]);
assert_eq!(xs.next(), Some(6));
}
|
