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
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
use itertools::Itertools;
use std::fmt::Debug;
use quickcheck::quickcheck;
struct Unspecialized<I>(I);
impl<I> Iterator for Unspecialized<I>
where
I: Iterator,
{
type Item = I::Item;
#[inline(always)]
fn next(&mut self) -> Option<Self::Item> {
self.0.next()
}
}
macro_rules! check_specialized {
($src:expr, |$it:pat| $closure:expr) => {
let $it = $src.clone();
let v1 = $closure;
let $it = Unspecialized($src.clone());
let v2 = $closure;
assert_eq!(v1, v2);
}
}
fn test_specializations<IterItem, Iter>(
it: &Iter,
) where
IterItem: Eq + Debug + Clone,
Iter: Iterator<Item = IterItem> + Clone,
{
check_specialized!(it, |i| i.count());
check_specialized!(it, |i| i.last());
check_specialized!(it, |i| i.collect::<Vec<_>>());
check_specialized!(it, |i| {
let mut parameters_from_fold = vec![];
let fold_result = i.fold(vec![], |mut acc, v: IterItem| {
parameters_from_fold.push((acc.clone(), v.clone()));
acc.push(v);
acc
});
(parameters_from_fold, fold_result)
});
check_specialized!(it, |mut i| {
let mut parameters_from_all = vec![];
let first = i.next();
let all_result = i.all(|x| {
parameters_from_all.push(x.clone());
Some(x)==first
});
(parameters_from_all, all_result)
});
let size = it.clone().count();
for n in 0..size + 2 {
check_specialized!(it, |mut i| i.nth(n));
}
// size_hint is a bit harder to check
let mut it_sh = it.clone();
for n in 0..size + 2 {
let len = it_sh.clone().count();
let (min, max) = it_sh.size_hint();
assert_eq!(size - n.min(size), len);
assert!(min <= len);
if let Some(max) = max {
assert!(len <= max);
}
it_sh.next();
}
}
quickcheck! {
fn intersperse(v: Vec<u8>) -> () {
test_specializations(&v.into_iter().intersperse(0));
}
}
quickcheck! {
fn put_back_qc(test_vec: Vec<i32>) -> () {
test_specializations(&itertools::put_back(test_vec.iter()));
let mut pb = itertools::put_back(test_vec.into_iter());
pb.put_back(1);
test_specializations(&pb);
}
}
quickcheck! {
fn merge_join_by_qc(i1: Vec<usize>, i2: Vec<usize>) -> () {
test_specializations(&i1.into_iter().merge_join_by(i2.into_iter(), std::cmp::Ord::cmp));
}
}
quickcheck! {
fn map_into(v: Vec<u8>) -> () {
test_specializations(&v.into_iter().map_into::<u32>());
}
}
quickcheck! {
fn map_ok(v: Vec<Result<u8, char>>) -> () {
test_specializations(&v.into_iter().map_ok(|u| u.checked_add(1)));
}
}
quickcheck! {
fn process_results(v: Vec<Result<u8, u8>>) -> () {
helper(v.iter().copied());
helper(v.iter().copied().filter(Result::is_ok));
fn helper(it: impl Iterator<Item = Result<u8, u8>> + Clone) {
macro_rules! check_results_specialized {
($src:expr, |$it:pat| $closure:expr) => {
assert_eq!(
itertools::process_results($src.clone(), |$it| $closure),
itertools::process_results($src.clone(), |i| {
let $it = Unspecialized(i);
$closure
}),
)
}
}
check_results_specialized!(it, |i| i.count());
check_results_specialized!(it, |i| i.last());
check_results_specialized!(it, |i| i.collect::<Vec<_>>());
check_results_specialized!(it, |i| {
let mut parameters_from_fold = vec![];
let fold_result = i.fold(vec![], |mut acc, v| {
parameters_from_fold.push((acc.clone(), v.clone()));
acc.push(v);
acc
});
(parameters_from_fold, fold_result)
});
check_results_specialized!(it, |mut i| {
let mut parameters_from_all = vec![];
let first = i.next();
let all_result = i.all(|x| {
parameters_from_all.push(x.clone());
Some(x)==first
});
(parameters_from_all, all_result)
});
let size = it.clone().count();
for n in 0..size + 2 {
check_results_specialized!(it, |mut i| i.nth(n));
}
}
}
}
|
