benchmark a push loop against extend()

main.rs

#![feature(test)]
extern crate test;
use test::Bencher;

fn push_loop<T: Iterator<Item = usize>>(iter: T) -> Vec<usize> {
    let mut vec = vec![];

    for e in iter {
        vec.push(e);
    }

    vec
}

fn extension<T: Iterator<Item = usize>>(iter: T) -> Vec<usize> {
    let mut vec = vec![];

    vec.extend(iter);

    vec
}

#[bench]
fn bench_push_loop(b: &mut Bencher) {
    let n = test::black_box(100);

    b.iter(|| push_loop(0..n) )
}

#[bench]
fn bench_extension(b: &mut Bencher) {
    let n = test::black_box(100);

    b.iter(|| extension(0..n) )
}