1 unstable release

0.1.2 Mar 9, 2021
0.1.1 Mar 9, 2021
0.1.0 Mar 9, 2021

#395 in No standard library

Download history 1729/week @ 2024-01-02 1746/week @ 2024-01-09 1562/week @ 2024-01-16 1066/week @ 2024-01-23 978/week @ 2024-01-30 1313/week @ 2024-02-06 1149/week @ 2024-02-13 1038/week @ 2024-02-20 1395/week @ 2024-02-27 1422/week @ 2024-03-05 1312/week @ 2024-03-12 1306/week @ 2024-03-19 1710/week @ 2024-03-26 1825/week @ 2024-04-02 1825/week @ 2024-04-09 1723/week @ 2024-04-16

7,437 downloads per month
Used in 5 crates (4 directly)

MIT/Apache

29KB
675 lines

LICENSE LICENSE Documentation Crates.io Version

This crates brings likely and unlikely branch prediction hints to stable rust

use likely_stable::{likely,unlikely};
use rand::random;

if likely(random::<i32>() > 10) {
    println!("likely!")
} else {
    println!("unlikely!")
}

It also provides if_likely and if_unlikely for branch prediction for if let statements.

use likely_stable::if_likely;
use rand::random;

let v = Some(random()).filter(|v:&i32| *v > 10);

if_likely!{let Some(v) = v => {
    println!("likely!")
} else {
    println!("unlikely!")
}};

Moreover traits LikelyBool, LikelyOption and LikelyResult provides likely and unlikely versions of the methods commonly used for types bool, Option and Result

use likely_stable::LikelyOption;
use rand::random;

let v = Some(random()).filter(|v:&i32| *v > 10);

v.map_or_else_likely(
    || println!("unlikely"),
    |v| println!("likely {}",v));

Usage

Add this to your Cargo.toml:

[dependencies]
likely_stable = "0.1"

Dependencies

~200KB