numaxiom 0.0.2

Lightweight numeric marker traits for ranges/signs plus constants and ops; std by default, no_std optional.
Documentation 
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/// Exponentiation helper.
///
/// Implementers should document domain restrictions (e.g., NaN, infinities,
/// negative bases with fractional exponents) and how exceptional cases are
/// surfaced.
pub trait Pow<Exp = Self> {
    type Output;

    fn pow(self, exponent: Exp) -> Self::Output;
}

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

    #[inline]
    fn powf_f32(base: f32, exp: f32) -> f32 {
        #[cfg(feature = "libm")]
        {
            libm::powf(base, exp)
        }
        #[cfg(not(feature = "libm"))]
        {
            f32::powf(base, exp)
        }
    }

    #[inline]
    fn powf_f64(base: f64, exp: f64) -> f64 {
        #[cfg(feature = "libm")]
        {
            libm::pow(base, exp)
        }
        #[cfg(not(feature = "libm"))]
        {
            f64::powf(base, exp)
        }
    }

    #[inline]
    fn powi_f32(base: f32, exp: i32) -> f32 {
        #[cfg(feature = "libm")]
        {
            powf_f32(base, exp as f32)
        }
        #[cfg(not(feature = "libm"))]
        {
            f32::powi(base, exp)
        }
    }

    #[inline]
    fn powi_f64(base: f64, exp: i32) -> f64 {
        #[cfg(feature = "libm")]
        {
            powf_f64(base, exp as f64)
        }
        #[cfg(not(feature = "libm"))]
        {
            f64::powi(base, exp)
        }
    }

    macro_rules! impl_pow_float_self {
        ($ty:ty, $fn:ident) => {
            impl Pow<$ty> for $ty {
                type Output = $ty;

                #[inline]
                fn pow(self, exponent: $ty) -> Self::Output {
                    $fn(self, exponent)
                }
            }
        };
    }

    macro_rules! impl_pow_float_int {
        ($ty:ty, $fn:ident) => {
            impl Pow<i32> for $ty {
                type Output = $ty;

                #[inline]
                fn pow(self, exponent: i32) -> Self::Output {
                    $fn(self, exponent)
                }
            }
        };
    }

    impl_pow_float_self!(f32, powf_f32);
    impl_pow_float_self!(f64, powf_f64);
    impl_pow_float_int!(f32, powi_f32);
    impl_pow_float_int!(f64, powi_f64);
}

macro_rules! impl_pow_int {
    ($($ty:ty),+ $(,)?) => {
        $(impl Pow<u32> for $ty {
            type Output = $ty;

            #[inline]
            fn pow(self, exponent: u32) -> Self::Output {
                <$ty>::pow(self, exponent)
            }
        })+
    };
}

impl_pow_int!(i8, i16, i32, i64, i128, isize);
impl_pow_int!(u8, u16, u32, u64, u128, usize);