Source code
Revision control
Copy as Markdown
Other Tools
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));
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);
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));
}
}
}
}