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use itertools::{EitherOrBoth, Itertools};
use std::fmt::Debug;
use std::ops::BitXor;
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<I::Item> {
self.0.next()
}
#[inline(always)]
fn size_hint(&self) -> (usize, Option<usize>) {
self.0.size_hint()
}
}
fn check_specialized<'a, V, IterItem, Iter, F>(iterator: &Iter, mapper: F)
where
V: Eq + Debug,
IterItem: 'a,
Iter: Iterator<Item = IterItem> + Clone + 'a,
F: Fn(Box<dyn Iterator<Item = IterItem> + 'a>) -> V,
{
assert_eq!(
mapper(Box::new(Unspecialized(iterator.clone()))),
mapper(Box::new(iterator.clone()))
)
}
fn check_specialized_count_last_nth_sizeh<'a, IterItem, Iter>(
it: &Iter,
known_expected_size: Option<usize>,
) where
IterItem: 'a + Eq + Debug,
Iter: Iterator<Item = IterItem> + Clone + 'a,
{
let size = it.clone().count();
if let Some(expected_size) = known_expected_size {
assert_eq!(size, expected_size);
}
check_specialized(it, |i| i.count());
check_specialized(it, |i| i.last());
for n in 0..size + 2 {
check_specialized(it, |mut i| i.nth(n));
}
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();
}
}
fn check_specialized_fold_xor<'a, IterItem, Iter>(it: &Iter)
where
IterItem: 'a
+ BitXor
+ Eq
+ Debug
+ BitXor<<IterItem as BitXor>::Output, Output = <IterItem as BitXor>::Output>
+ Clone,
<IterItem as BitXor>::Output:
BitXor<Output = <IterItem as BitXor>::Output> + Eq + Debug + Clone,
Iter: Iterator<Item = IterItem> + Clone + 'a,
{
check_specialized(it, |mut i| {
let first = i.next().map(|f| f.clone() ^ (f.clone() ^ f));
i.fold(first, |acc, v: IterItem| acc.map(move |a| v ^ a))
});
}
fn put_back_test(test_vec: Vec<i32>, known_expected_size: Option<usize>) {
{
// Lexical lifetimes support
let pb = itertools::put_back(test_vec.iter());
check_specialized_count_last_nth_sizeh(&pb, known_expected_size);
check_specialized_fold_xor(&pb);
}
let mut pb = itertools::put_back(test_vec.into_iter());
pb.put_back(1);
check_specialized_count_last_nth_sizeh(&pb, known_expected_size.map(|x| x + 1));
check_specialized_fold_xor(&pb)
}
#[test]
fn put_back() {
put_back_test(vec![7, 4, 1], Some(3));
}
quickcheck! {
fn put_back_qc(test_vec: Vec<i32>) -> () {
put_back_test(test_vec, None)
}
}
fn merge_join_by_test(i1: Vec<usize>, i2: Vec<usize>, known_expected_size: Option<usize>) {
let i1 = i1.into_iter();
let i2 = i2.into_iter();
let mjb = i1.clone().merge_join_by(i2.clone(), std::cmp::Ord::cmp);
check_specialized_count_last_nth_sizeh(&mjb, known_expected_size);
// Rust 1.24 compatibility:
fn eob_left_z(eob: EitherOrBoth<usize, usize>) -> usize {
eob.left().unwrap_or(0)
}
fn eob_right_z(eob: EitherOrBoth<usize, usize>) -> usize {
eob.left().unwrap_or(0)
}
fn eob_both_z(eob: EitherOrBoth<usize, usize>) -> usize {
let (a, b) = eob.both().unwrap_or((0, 0));
assert_eq!(a, b);
a
}
check_specialized_fold_xor(&mjb.clone().map(eob_left_z));
check_specialized_fold_xor(&mjb.clone().map(eob_right_z));
check_specialized_fold_xor(&mjb.clone().map(eob_both_z));
// And the other way around
let mjb = i2.merge_join_by(i1, std::cmp::Ord::cmp);
check_specialized_count_last_nth_sizeh(&mjb, known_expected_size);
check_specialized_fold_xor(&mjb.clone().map(eob_left_z));
check_specialized_fold_xor(&mjb.clone().map(eob_right_z));
check_specialized_fold_xor(&mjb.clone().map(eob_both_z));
}
#[test]
fn merge_join_by() {
let i1 = vec![1, 3, 5, 7, 8, 9];
let i2 = vec![0, 3, 4, 5];
merge_join_by_test(i1, i2, Some(8));
}
quickcheck! {
fn merge_join_by_qc(i1: Vec<usize>, i2: Vec<usize>) -> () {
merge_join_by_test(i1, i2, None)
}
}
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