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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;
fn tuple_comb_for1(c: &mut Criterion) {
c.bench_function("tuple comb for1", move |b| {
b.iter(|| {
for i in 0..N1 {
black_box(i);
}
})
});
}
fn tuple_comb_for2(c: &mut Criterion) {
c.bench_function("tuple comb for2", move |b| {
b.iter(|| {
for i in 0..N2 {
for j in (i + 1)..N2 {
black_box(i + j);
}
}
})
});
}
fn tuple_comb_for3(c: &mut Criterion) {
c.bench_function("tuple 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(i + j + k);
}
}
}
})
});
}
fn tuple_comb_for4(c: &mut Criterion) {
c.bench_function("tuple 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(i + j + k + l);
}
}
}
}
})
});
}
fn tuple_comb_c1(c: &mut Criterion) {
c.bench_function("tuple comb c1", move |b| {
b.iter(|| {
for (i,) in (0..N1).tuple_combinations() {
black_box(i);
}
})
});
}
fn tuple_comb_c2(c: &mut Criterion) {
c.bench_function("tuple comb c2", move |b| {
b.iter(|| {
for (i, j) in (0..N2).tuple_combinations() {
black_box(i + j);
}
})
});
}
fn tuple_comb_c3(c: &mut Criterion) {
c.bench_function("tuple comb c3", move |b| {
b.iter(|| {
for (i, j, k) in (0..N3).tuple_combinations() {
black_box(i + j + k);
}
})
});
}
fn tuple_comb_c4(c: &mut Criterion) {
c.bench_function("tuple comb c4", move |b| {
b.iter(|| {
for (i, j, k, l) in (0..N4).tuple_combinations() {
black_box(i + j + k + l);
}
})
});
}
criterion_group!(
benches,
tuple_comb_for1,
tuple_comb_for2,
tuple_comb_for3,
tuple_comb_for4,
tuple_comb_c1,
tuple_comb_c2,
tuple_comb_c3,
tuple_comb_c4,
);
criterion_main!(benches);