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use std::collections::BTreeSet;
use rand::{thread_rng, Rng};
use test::{black_box, Bencher};
fn random(n: usize) -> BTreeSet<usize> {
let mut rng = thread_rng();
let mut set = BTreeSet::new();
while set.len() < n {
set.insert(rng.gen());
}
assert_eq!(set.len(), n);
set
}
fn neg(n: usize) -> BTreeSet<i32> {
let mut set = BTreeSet::new();
for i in -(n as i32)..=-1 {
set.insert(i);
}
assert_eq!(set.len(), n);
set
}
fn pos(n: usize) -> BTreeSet<i32> {
let mut set = BTreeSet::new();
for i in 1..=(n as i32) {
set.insert(i);
}
assert_eq!(set.len(), n);
set
}
fn stagger(n1: usize, factor: usize) -> [BTreeSet<u32>; 2] {
let n2 = n1 * factor;
let mut sets = [BTreeSet::new(), BTreeSet::new()];
for i in 0..(n1 + n2) {
let b = i % (factor + 1) != 0;
sets[b as usize].insert(i as u32);
}
assert_eq!(sets[0].len(), n1);
assert_eq!(sets[1].len(), n2);
sets
}
macro_rules! set_bench {
($name: ident, $set_func: ident, $result_func: ident, $sets: expr) => {
#[bench]
pub fn $name(b: &mut Bencher) {
// setup
let sets = $sets;
// measure
b.iter(|| {
let x = sets[0].$set_func(&sets[1]).$result_func();
black_box(x);
})
}
};
}
set_bench! {intersection_100_neg_vs_100_pos, intersection, count, [neg(100), pos(100)]}
set_bench! {intersection_100_neg_vs_10k_pos, intersection, count, [neg(100), pos(10_000)]}
set_bench! {intersection_100_pos_vs_100_neg, intersection, count, [pos(100), neg(100)]}
set_bench! {intersection_100_pos_vs_10k_neg, intersection, count, [pos(100), neg(10_000)]}
set_bench! {intersection_10k_neg_vs_100_pos, intersection, count, [neg(10_000), pos(100)]}
set_bench! {intersection_10k_neg_vs_10k_pos, intersection, count, [neg(10_000), pos(10_000)]}
set_bench! {intersection_10k_pos_vs_100_neg, intersection, count, [pos(10_000), neg(100)]}
set_bench! {intersection_10k_pos_vs_10k_neg, intersection, count, [pos(10_000), neg(10_000)]}
set_bench! {intersection_random_100_vs_100, intersection, count, [random(100), random(100)]}
set_bench! {intersection_random_100_vs_10k, intersection, count, [random(100), random(10_000)]}
set_bench! {intersection_random_10k_vs_100, intersection, count, [random(10_000), random(100)]}
set_bench! {intersection_random_10k_vs_10k, intersection, count, [random(10_000), random(10_000)]}
set_bench! {intersection_staggered_100_vs_100, intersection, count, stagger(100, 1)}
set_bench! {intersection_staggered_10k_vs_10k, intersection, count, stagger(10_000, 1)}
set_bench! {intersection_staggered_100_vs_10k, intersection, count, stagger(100, 100)}
set_bench! {difference_random_100_vs_100, difference, count, [random(100), random(100)]}
set_bench! {difference_random_100_vs_10k, difference, count, [random(100), random(10_000)]}
set_bench! {difference_random_10k_vs_100, difference, count, [random(10_000), random(100)]}
set_bench! {difference_random_10k_vs_10k, difference, count, [random(10_000), random(10_000)]}
set_bench! {difference_staggered_100_vs_100, difference, count, stagger(100, 1)}
set_bench! {difference_staggered_10k_vs_10k, difference, count, stagger(10_000, 1)}
set_bench! {difference_staggered_100_vs_10k, difference, count, stagger(100, 100)}
set_bench! {is_subset_100_vs_100, is_subset, clone, [pos(100), pos(100)]}
set_bench! {is_subset_100_vs_10k, is_subset, clone, [pos(100), pos(10_000)]}
set_bench! {is_subset_10k_vs_100, is_subset, clone, [pos(10_000), pos(100)]}
set_bench! {is_subset_10k_vs_10k, is_subset, clone, [pos(10_000), pos(10_000)]}
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