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use crate::{ibig::IBig, ubig::UBig};
use core::ops::Neg;
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
pub(crate) enum Sign {
Positive,
Negative,
}
use Sign::*;
impl Neg for Sign {
type Output = Sign;
fn neg(self) -> Sign {
match self {
Positive => Negative,
Negative => Positive,
}
}
}
impl IBig {
pub fn signum(&self) -> IBig {
match self.sign() {
Positive => {
if *self.magnitude() == UBig::from_word(0) {
IBig::from(0u8)
} else {
IBig::from(1u8)
}
}
Negative => IBig::from(-1i8),
}
}
#[deprecated(since = "0.2.1", note = "use `< ibig!(0)` instead")]
pub fn is_negative(&self) -> bool {
*self < IBig::from(0u8)
}
#[deprecated(since = "0.2.1", note = "use `> ibig!(0)` instead")]
pub fn is_positive(&self) -> bool {
*self > IBig::from(0u8)
}
}
impl Neg for IBig {
type Output = IBig;
fn neg(self) -> IBig {
let (sign, mag) = self.into_sign_magnitude();
IBig::from_sign_magnitude(-sign, mag)
}
}
impl Neg for &IBig {
type Output = IBig;
fn neg(self) -> IBig {
self.clone().neg()
}
}
pub trait Abs {
type Output;
fn abs(self) -> Self::Output;
}
impl Abs for IBig {
type Output = IBig;
fn abs(self) -> IBig {
IBig::from(self.unsigned_abs())
}
}
impl Abs for &IBig {
type Output = IBig;
fn abs(self) -> IBig {
IBig::from(self.unsigned_abs())
}
}
pub trait UnsignedAbs {
type Output;
fn unsigned_abs(self) -> Self::Output;
}
impl UnsignedAbs for IBig {
type Output = UBig;
fn unsigned_abs(self) -> UBig {
let (_, mag) = self.into_sign_magnitude();
mag
}
}
impl UnsignedAbs for &IBig {
type Output = UBig;
fn unsigned_abs(self) -> UBig {
self.magnitude().clone()
}
}