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randomize 2.1.0

A dead simple to use randomization library for rust.
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#![feature(test)]

extern crate test;
use test::Bencher;

use randomize::*;
use std::time::{SystemTime, UNIX_EPOCH};

pub fn u64_from_time() -> u64 {
  let unix_delta = match SystemTime::now().duration_since(UNIX_EPOCH) {
    Ok(duration) => duration,
    Err(system_time_error) => system_time_error.duration(),
  };
  if unix_delta.subsec_nanos() != 0 {
    unix_delta.as_secs().wrapping_mul(unix_delta.subsec_nanos() as u64)
  } else {
    unix_delta.as_secs()
  }
}

#[bench]
fn bench_lcg64_xsh_rr_64_32(b: &mut Bencher) {
  let mut gen = PCGPickU64::from(u64_from_time());
  b.iter(|| {
    for _ in 0..1000 {
      gen.next_u32();
    }
  });
}

#[bench]
fn bench_lcg64_xsh_rs_64_32(b: &mut Bencher) {
  let mut gen = PCGPickU64::from(u64_from_time());
  b.iter(|| {
    for _ in 0..1000 {
      gen.next_u32shift();
    }
  });
}

#[bench]
fn bench_lcg64_xsl_rr_64_32(b: &mut Bencher) {
  let mut gen = PCGPickU64::from(u64_from_time());
  b.iter(|| {
    for _ in 0..1000 {
      gen.next_u32xslrr();
    }
  });
}