src/libcore/benches/char/methods.rs

use test::Bencher;

const CHARS: [char; 9] = ['0', 'x', '2', '5', 'A', 'f', '7', '8', '9'];
const RADIX: [u32; 5] = [2, 8, 10, 16, 32];

#[bench]
fn bench_to_digit_radix_2(b: &mut Bencher) {
    b.iter(|| CHARS.iter().cycle().take(10_000).map(|c| c.to_digit(2)).min())
}

#[bench]
fn bench_to_digit_radix_10(b: &mut Bencher) {
    b.iter(|| CHARS.iter().cycle().take(10_000).map(|c| c.to_digit(10)).min())
}

#[bench]
fn bench_to_digit_radix_16(b: &mut Bencher) {
    b.iter(|| CHARS.iter().cycle().take(10_000).map(|c| c.to_digit(16)).min())
}

#[bench]
fn bench_to_digit_radix_36(b: &mut Bencher) {
    b.iter(|| CHARS.iter().cycle().take(10_000).map(|c| c.to_digit(36)).min())
}

#[bench]
fn bench_to_digit_radix_var(b: &mut Bencher) {
    b.iter(|| {
        CHARS
            .iter()
            .cycle()
            .zip(RADIX.iter().cycle())
            .take(10_000)
            .map(|(c, radix)| c.to_digit(*radix))
            .min()
    })
}