tetsy-hash256-std-hasher 0.15.3

// Copyright 2017, 2018 Parity Technologies
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#[macro_use]
extern crate criterion;
use criterion::{Criterion, black_box};
criterion_group!(benches, write_tetsy_hash256_std_hasher, write_default_hasher);
criterion_main!(benches);

extern crate tetsy_hash256_std_hasher;

use std::hash::Hasher;
use std::collections::hash_map::DefaultHasher;
use tetsy_hash256_std_hasher::Hash256StdHasher;

fn write_tetsy_hash256_std_hasher(b: &mut Criterion) {
	b.bench_function("write_tetsy_hash256_std_hasher", |b| b.iter(|| {
		let n: u8 = black_box(100);
		(0..n).fold(Hash256StdHasher::default(), |mut old, new| {
			let bb = black_box([new; 32]);
			old.write(&bb as &[u8]);
			old
		});
	}));
}

fn write_default_hasher(b: &mut Criterion) {
	b.bench_function("write_default_hasher", |b| b.iter(|| {
		let n: u8 = black_box(100);
		(0..n).fold(DefaultHasher::default(), |mut old, new| {
			let bb = black_box([new; 32]);
			old.write(&bb as &[u8]);
			old
		});
	}));
}