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use criterion::{black_box, criterion_group, criterion_main, Criterion};
use itertools::Itertools;
// approximate 100_000 iterations for each combination
const N1: usize = 100_000;
const N2: usize = 448;
const N3: usize = 86;
const N4: usize = 41;
const N14: usize = 21;
fn comb_for1(c: &mut Criterion) {
c.bench_function("comb for1", move |b| {
b.iter(|| {
for i in 0..N1 {
black_box(vec![i]);
}
})
});
}
fn comb_for2(c: &mut Criterion) {
c.bench_function("comb for2", move |b| {
b.iter(|| {
for i in 0..N2 {
for j in (i + 1)..N2 {
black_box(vec![i, j]);
}
}
})
});
}
fn comb_for3(c: &mut Criterion) {
c.bench_function("comb for3", move |b| {
b.iter(|| {
for i in 0..N3 {
for j in (i + 1)..N3 {
for k in (j + 1)..N3 {
black_box(vec![i, j, k]);
}
}
}
})
});
}
fn comb_for4(c: &mut Criterion) {
c.bench_function("comb for4", move |b| {
b.iter(|| {
for i in 0..N4 {
for j in (i + 1)..N4 {
for k in (j + 1)..N4 {
for l in (k + 1)..N4 {
black_box(vec![i, j, k, l]);
}
}
}
}
})
});
}
fn comb_c1(c: &mut Criterion) {
c.bench_function("comb c1", move |b| {
b.iter(|| {
for combo in (0..N1).combinations(1) {
black_box(combo);
}
})
});
}
fn comb_c2(c: &mut Criterion) {
c.bench_function("comb c2", move |b| {
b.iter(|| {
for combo in (0..N2).combinations(2) {
black_box(combo);
}
})
});
}
fn comb_c3(c: &mut Criterion) {
c.bench_function("comb c3", move |b| {
b.iter(|| {
for combo in (0..N3).combinations(3) {
black_box(combo);
}
})
});
}
fn comb_c4(c: &mut Criterion) {
c.bench_function("comb c4", move |b| {
b.iter(|| {
for combo in (0..N4).combinations(4) {
black_box(combo);
}
})
});
}
fn comb_c14(c: &mut Criterion) {
c.bench_function("comb c14", move |b| {
b.iter(|| {
for combo in (0..N14).combinations(14) {
black_box(combo);
}
})
});
}
criterion_group!(
benches,
comb_for1,
comb_for2,
comb_for3,
comb_for4,
comb_c1,
comb_c2,
comb_c3,
comb_c4,
comb_c14,
);
criterion_main!(benches);