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min.rs
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min.rs
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use bencher::{Bencher, benchmark_group, benchmark_main};
/// Create a random vector of random floats in [0, 1].
fn initialize_vec() -> Vec<f64> {
use rand_distr::{Uniform, Distribution};
use rand::SeedableRng;
let range = Uniform::new(0.0, 1.0);
let n = 1_000_000;
let mut values = Vec::with_capacity(n);
let mut rng = rand_xoshiro::Xoshiro256StarStar::from_seed(
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32]);
for _ in 0..n {
values.push(range.sample(&mut rng));
}
values
}
fn bench_average(b: &mut Bencher) {
let values = initialize_vec();
b.iter(|| {
let a: average::Min = values.iter().copied().collect();
a
});
}
fn bench_iter(b: &mut Bencher) {
let values = initialize_vec();
b.iter(|| {
let mut it = values.iter();
let init: f64 = *it.next().unwrap();
it.fold(init, |a, &b| a.min(b))
});
}
benchmark_group!(benches, bench_average, bench_iter);
benchmark_main!(benches);