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/*
Copyright 2024 Owain Davies
SPDX-License-Identifier: Apache-2.0 OR MIT
*/
use crate::Arbi;
impl Arbi {
/// Computes the absolute value of `self`.
///
/// # Examples
/// ```
/// use arbi::Arbi;
/// let neg = Arbi::from(-123456789);
/// assert_eq!(neg.abs(), 123456789);
/// ```
///
/// # Complexity
/// \\( O(1) \\)
#[inline(always)]
pub fn abs(mut self) -> Arbi {
if self.neg {
self.negate_mut();
}
self
}
/// Computes the absolute value of `self`.
///
/// # Examples
/// ```
/// use arbi::Arbi;
/// let mut neg = Arbi::from(-123456789);
/// neg.abs_mut();
/// assert_eq!(neg, 123456789);
/// ```
///
/// # Complexity
/// \\( O(1) \\)
#[inline(always)]
pub fn abs_mut(&mut self) {
if self.neg {
self.neg = false;
}
}
/// Computes the absolute value of `self`.
///
/// # Examples
/// ```
/// use arbi::Arbi;
/// let neg = Arbi::from(-123456789);
/// assert_eq!(neg.abs_ref(), 123456789);
/// ```
///
/// # Complexity
/// \\( O(n) \\)
#[inline(always)]
pub fn abs_ref(&self) -> Arbi {
let mut ret = self.clone();
if self.neg {
ret.negate_mut();
}
ret
}
}
#[cfg(test)]
mod tests {
use crate::Arbi;
#[test]
fn test_abs() {
let pos = Arbi::from(123);
assert_eq!(123, pos.abs());
let neg = Arbi::from(-123);
assert_eq!(123, neg.abs());
let zer = Arbi::zero();
assert_eq!(0, zer.abs());
}
#[test]
fn test_abs_mut() {
let mut pos = Arbi::from(123);
pos.abs_mut();
assert_eq!(pos, 123);
let mut neg = Arbi::from(-123);
neg.abs_mut();
assert_eq!(neg, 123);
let mut zer = Arbi::zero();
zer.abs_mut();
assert_eq!(zer, 0);
}
#[test]
fn test_abs_ref() {
let pos = Arbi::from(123);
assert_eq!(pos.abs_ref(), 123);
let neg = Arbi::from(-123);
assert_eq!(neg.abs_ref(), 123);
let zer = Arbi::zero();
assert_eq!(zer.abs_ref(), 0);
}
}