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extern crate arrayvec;
#[macro_use] extern crate bencher;
use std::io::Write;
use arrayvec::ArrayVec;
use bencher::Bencher;
use bencher::black_box;
fn extend_with_constant(b: &mut Bencher) {
let mut v = ArrayVec::<[u8; 512]>::new();
let cap = v.capacity();
b.iter(|| {
v.clear();
let constant = black_box(1);
v.extend((0..cap).map(move |_| constant));
v[511]
});
b.bytes = v.capacity() as u64;
}
fn extend_with_range(b: &mut Bencher) {
let mut v = ArrayVec::<[u8; 512]>::new();
let cap = v.capacity();
b.iter(|| {
v.clear();
let range = 0..cap;
v.extend(range.map(|x| black_box(x as _)));
v[511]
});
b.bytes = v.capacity() as u64;
}
fn extend_with_slice(b: &mut Bencher) {
let mut v = ArrayVec::<[u8; 512]>::new();
let data = [1; 512];
b.iter(|| {
v.clear();
let iter = data.iter().map(|&x| x);
v.extend(iter);
v[511]
});
b.bytes = v.capacity() as u64;
}
fn extend_with_write(b: &mut Bencher) {
let mut v = ArrayVec::<[u8; 512]>::new();
let data = [1; 512];
b.iter(|| {
v.clear();
v.write(&data[..]).ok();
v[511]
});
b.bytes = v.capacity() as u64;
}
fn extend_from_slice(b: &mut Bencher) {
let mut v = ArrayVec::<[u8; 512]>::new();
let data = [1; 512];
b.iter(|| {
v.clear();
v.try_extend_from_slice(&data).ok();
v[511]
});
b.bytes = v.capacity() as u64;
}
benchmark_group!(benches,
extend_with_constant,
extend_with_range,
extend_with_slice,
extend_with_write,
extend_from_slice
);
benchmark_main!(benches);
|
