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Specialization test framework + tests
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extern crate itertools; | ||
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use itertools::{Itertools, EitherOrBoth}; | ||
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use std::fmt::Debug; | ||
use std::ops::BitXor; | ||
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struct Unspecialized<I>(I); | ||
impl<I> Iterator for Unspecialized<I> | ||
where | ||
I: Iterator, | ||
{ | ||
type Item = I::Item; | ||
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#[inline(always)] | ||
fn next(&mut self) -> Option<I::Item> { | ||
self.0.next() | ||
} | ||
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#[inline(always)] | ||
fn size_hint(&self) -> (usize, Option<usize>) { | ||
self.0.size_hint() | ||
} | ||
} | ||
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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<Iterator<Item = IterItem> + 'a>) -> V, | ||
{ | ||
assert_eq!( | ||
mapper(Box::new(Unspecialized(iterator.clone()))), | ||
mapper(Box::new(iterator.clone())) | ||
) | ||
} | ||
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fn check_specialized_count_last_nth_sizeh<'a, IterItem, Iter>(it: &Iter, expected_size: usize) | ||
where | ||
IterItem: 'a + Eq + Debug, | ||
Iter: Iterator<Item = IterItem> + Clone + 'a, | ||
{ | ||
let size = it.clone().count(); | ||
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(); | ||
} | ||
} | ||
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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)) | ||
}); | ||
} | ||
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#[test] | ||
fn put_back() { | ||
let test_vec = vec![7, 4, 1]; | ||
{ | ||
// Lexical lifetimes support | ||
let pb = itertools::put_back(test_vec.iter()); | ||
check_specialized_count_last_nth_sizeh(&pb, 3); | ||
check_specialized_fold_xor(&pb); | ||
} | ||
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let mut pb = itertools::put_back(test_vec.into_iter()); | ||
pb.put_back(1); | ||
check_specialized_count_last_nth_sizeh(&pb, 4); | ||
check_specialized_fold_xor(&pb); | ||
} | ||
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#[test] | ||
fn merge_join_by() { | ||
let i1 = vec![1, 3, 5].into_iter(); | ||
let i2 = vec![0, 3, 4, 5].into_iter(); | ||
let mjb = i1.merge_join_by(i2, std::cmp::Ord::cmp); | ||
check_specialized_count_last_nth_sizeh(&mjb, 5); | ||
// 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)); | ||
} |