Sha256: 7e6240878b1fc13b6384fdde0317d5d7ccca3e417b10a201ba61eb5255400fda
Contents?: true
Size: 978 Bytes
Versions: 13
Compression:
Stored size: 978 Bytes
Contents
use itertools::Itertools;
struct PanickingCounter {
curr: usize,
max: usize,
}
impl Iterator for PanickingCounter {
type Item = ();
fn next(&mut self) -> Option<Self::Item> {
self.curr += 1;
assert_ne!(
self.curr, self.max,
"Input iterator reached maximum of {} suggesting collection by adaptor",
self.max
);
Some(())
}
}
fn no_collect_test<A, T>(to_adaptor: T)
where
A: Iterator,
T: Fn(PanickingCounter) -> A,
{
let counter = PanickingCounter {
curr: 0,
max: 10_000,
};
let adaptor = to_adaptor(counter);
for _ in adaptor.take(5) {}
}
#[test]
fn permutations_no_collect() {
no_collect_test(|iter| iter.permutations(5))
}
#[test]
fn combinations_no_collect() {
no_collect_test(|iter| iter.combinations(5))
}
#[test]
fn combinations_with_replacement_no_collect() {
no_collect_test(|iter| iter.combinations_with_replacement(5))
}
Version data entries
13 entries across 13 versions & 1 rubygems