numaxiom 0.0.2

Lightweight numeric marker traits for ranges/signs plus constants and ops; std by default, no_std optional.
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

/// Base-2 logarithm helper.
pub trait Log2: Sized {
    fn log2(self) -> Self;
}

#[cfg(any(feature = "std", feature = "libm"))]
mod float_impls {
    use super::Log2;

    fn log2_f32(x: f32) -> f32 {
        #[cfg(feature = "libm")]
        {
            libm::log2f(x)
        }
        #[cfg(not(feature = "libm"))]
        {
            f32::log2(x)
        }
    }

    fn log2_f64(x: f64) -> f64 {
        #[cfg(feature = "libm")]
        {
            libm::log2(x)
        }
        #[cfg(not(feature = "libm"))]
        {
            f64::log2(x)
        }
    }

    macro_rules! impl_log2_for_float {
        ($ty:ty, $fn:ident) => {
            impl Log2 for $ty {
                fn log2(self) -> Self {
                    $fn(self)
                }
            }
        };
    }

    impl_log2_for_float!(f32, log2_f32);
    impl_log2_for_float!(f64, log2_f64);
}