Before, the `count` would be copied into the closure and could
potentially be optimized way. This change ensures it's borrowed by
closure and finally consumed by `test::black_box`.
fn sort_large_random_expensive(b: &mut Bencher) {
let len = 10000;
b.iter(|| {
+ let mut v = gen_random(len);
let mut count = 0;
- let cmp = move |a: &u64, b: &u64| {
+ v.sort_by(|a: &u64, b: &u64| {
count += 1;
if count % 1_000_000_000 == 0 {
panic!("should not happen");
}
(*a as f64).cos().partial_cmp(&(*b as f64).cos()).unwrap()
- };
-
- let mut v = gen_random(len);
- v.sort_by(cmp);
-
+ });
black_box(count);
});
b.bytes = len as u64 * mem::size_of::<u64>() as u64;