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
63
64
65

// Copyright 2018-2024 argmin developers
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.

use crate::ArgminRandom;
use rand::Rng;

macro_rules! make_random {
    ($t:ty) => {
        impl ArgminRandom for $t {
            #[inline]
            fn rand_from_range<R: Rng>(min: &Self, max: &Self, rng: &mut R) -> $t {
                rng.gen_range(*min..*max)
            }
        }
    };
}

make_random!(f32);
make_random!(f64);
make_random!(i8);
make_random!(i16);
make_random!(i32);
make_random!(i64);
make_random!(u8);
make_random!(u16);
make_random!(u32);
make_random!(u64);

#[cfg(test)]
mod tests {
    use super::*;
    use paste::item;
    use rand::SeedableRng;

    macro_rules! make_test {
        ($t:ty) => {
            item! {
                #[test]
                fn [<test_random_vec_ $t>]() {
                    let a = 1 as $t;
                    let b = 2 as $t;
                    let mut rng = rand::rngs::StdRng::seed_from_u64(42);
                    let random = $t::rand_from_range(&a, &b, &mut rng);
                    assert!(random >= a);
                    assert!(random <= b);
                }
            }
        };
    }

    make_test!(f32);
    make_test!(f64);
    make_test!(i8);
    make_test!(u8);
    make_test!(i16);
    make_test!(u16);
    make_test!(i32);
    make_test!(u32);
    make_test!(i64);
    make_test!(u64);
}