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

/// Absolute value helper.
///
/// Contract (minimum): return the magnitude of `self`. Implementers must
/// document how they handle values that cannot be represented after abs (e.g.,
/// negative minimum for signed ints) and incomparable inputs (e.g., `NaN`).
pub trait Abs: Sized {
    /// Returns the absolute value of `self`.
    ///
    /// Implementations for unsigned types usually return `self`.
    fn abs(self) -> Self;
}

macro_rules! impl_abs_signed {
    ($($ty:ty),+ $(,)?) => {
        $(impl Abs for $ty {
            fn abs(self) -> Self {
                <$ty>::abs(self)
            }
        })+
    };
}

macro_rules! impl_abs_unsigned {
    ($($ty:ty),+ $(,)?) => {
        $(impl Abs for $ty {
            fn abs(self) -> Self {
                self
            }
        })+
    };
}

impl_abs_signed!(i8, i16, i32, i64, i128, isize);
impl_abs_signed!(f32, f64);
impl_abs_unsigned!(u8, u16, u32, u64, u128, usize);