foo.rs

#![feature(collections, test)]

extern crate test;

const AMT1: usize = 1000;
const AMT2: usize = 1001;
const E1: u8 = 0;
const E2: u8 = 2;

#[bench]
fn macro_repeat1(b: &mut test::Bencher) {
    b.iter(|| { vec![E1; AMT1] });
}
#[bench]
fn macro_repeat2(b: &mut test::Bencher) {
    b.iter(|| { vec![E2; AMT2] });
}

#[bench]
fn map_clone1(b: &mut test::Bencher) {
    b.iter(|| {
        (0..AMT1).map(|_| E1).collect::<Vec<_>>()
    });
}
#[bench]
fn map_clone2(b: &mut test::Bencher) {
    b.iter(|| {
        (0..AMT2).map(|_| E2).collect::<Vec<_>>()
    });
}

#[bench]
fn repeat1(b: &mut test::Bencher) {
    b.iter(|| {
        std::iter::repeat(E1).take(AMT1).collect::<Vec<_>>()
    });
}
#[bench]
fn repeat2(b: &mut test::Bencher) {
    b.iter(|| {
        std::iter::repeat(E2).take(AMT2).collect::<Vec<_>>()
    });
}