arbi/
unary_ops.rs

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/*
Copyright 2024 Owain Davies
SPDX-License-Identifier: Apache-2.0 OR MIT
*/

use crate::Arbi;

impl core::ops::Neg for Arbi {
    type Output = Self;

    fn neg(mut self) -> Self {
        if self.size() != 0 {
            self.neg = !self.neg;
        }
        self
    }
}

impl core::ops::Neg for &Arbi {
    type Output = Arbi;

    fn neg(self) -> Arbi {
        if self.size() != 0 {
            let ret = self.clone();
            -ret
        } else {
            Arbi::zero()
        }
    }
}

#[cfg(test)]
mod tests {
    use crate::Arbi;

    #[test]
    fn test_unary_minus() {
        let a = Arbi::from(10);
        let b = Arbi::from(-10);
        let z = Arbi::zero();

        assert_eq!(-a, -10);
        assert_eq!(-b, 10);
        assert_eq!(-z, 0);
    }

    #[test]
    fn test_unary_minus_reference() {
        let a = Arbi::from(10);
        let b = Arbi::from(-10);
        let z = Arbi::zero();

        assert_eq!(-(&a), -10);
        assert_eq!(-(&b), 10);
        assert_eq!(-(&z), 0);
    }
}