map_range_int 1.1.0

map a value from one range to another
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62

use map_range_int::MapRange;
use std::hint::black_box;
use std::time::SystemTime;

const REPEAT: usize = 10000;
const REPEAT_F: f64 = 10000f64;

#[test]
fn test_map_ui() {
    let t0 = SystemTime::now();
    for _ in 0..REPEAT {
        for x in 0..=255u8 {
            let _x2 = black_box(x.map_range((0, 255), (-128i8, 127i8)));
        }
    }
    eprintln!(
        "u8->i8 {:#?}ns",
        (t0.elapsed().unwrap().as_secs_f64() / (255f64 * REPEAT_F)) * 1e9f64
    );
}

#[test]
fn test_map_uu() {
    let t0 = SystemTime::now();
    for _ in 0..REPEAT {
        for x in 0..=255u8 {
            let _x2: Option<u8> = black_box(x.map_range((0, 255), (0, 255)));
        }
    }
    eprintln!(
        "u8->u8 {:#?}ns",
        (t0.elapsed().unwrap().as_secs_f64() / (255f64 * REPEAT_F)) * 1e9f64
    );
}

#[test]
fn test_map_ii() {
    let t0 = SystemTime::now();
    for _ in 0..REPEAT {
        for x in -128..127i8 {
            let _x2: Option<i8> = black_box(x.map_range((-128, 127), (-128, 127)));
        }
    }
    eprintln!(
        "i8->i8 {:#?}ns",
        (t0.elapsed().unwrap().as_secs_f64() / (255f64 * REPEAT_F)) * 1e9f64
    );
}

#[test]
fn test_map_iu() {
    let t0 = SystemTime::now();
    for _ in 0..REPEAT {
        for x in -128..127i8 {
            let _x2: Option<u8> = black_box(x.map_range((-128, 127), (0, 255)));
        }
    }
    eprintln!(
        "i8->u8 {:#?}ns",
        (t0.elapsed().unwrap().as_secs_f64() / (255f64 * REPEAT_F)) * 1e9f64
    );
}