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use criterion::Bencher;
use rand09::Rng;
use time::{Date, Duration, Month, OffsetDateTime, PrimitiveDateTime, Time, UtcOffset, Weekday};
macro_rules! bench_rand {
($($name:ident : $type:ty),* $(,)?) => {
setup_benchmark! {
"Random",
$(fn $name(ben: &mut Bencher<'_>) {
iter_batched_ref!(
ben,
|| StepRng::new(0, 1),
[|rng| rng.random::<$type>()]
);
})*
}
}
}
bench_rand![
time: Time,
date: Date,
utc_offset: UtcOffset,
primitive_date_time: PrimitiveDateTime,
offset_date_time: OffsetDateTime,
duration: Duration,
weekday: Weekday,
month: Month,
];
// copy of `StepRng` from rand 0.8 to avoid deprecation warnings
#[derive(Debug, Clone)]
struct StepRng {
v: u64,
a: u64,
}
impl StepRng {
const fn new(initial: u64, increment: u64) -> Self {
Self {
v: initial,
a: increment,
}
}
}
impl rand09::RngCore for StepRng {
fn next_u32(&mut self) -> u32 {
self.next_u64() as u32
}
fn next_u64(&mut self) -> u64 {
let res = self.v;
self.v = self.v.wrapping_add(self.a);
res
}
fn fill_bytes(&mut self, dst: &mut [u8]) {
rand09::rand_core::impls::fill_bytes_via_next(self, dst)
}
}
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