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// Copyright © 2026 Mikhail Hogrefe
//
// This file is part of Malachite.
//
// Malachite is free software: you can redistribute it and/or modify it under the terms of the GNU
// Lesser General Public License (LGPL) as published by the Free Software Foundation; either version
// 3 of the License, or (at your option) any later version. See <https://www.gnu.org/licenses/>.
use crate::rational_vector::RationalVector;
use core::ops::Neg;
use malachite_base::num::arithmetic::traits::NegAssign;
impl Neg for RationalVector {
type Output = Self;
/// Negates a [`RationalVector`], taking it by value.
///
/// Every element is negated, so the dimension is unchanged.
///
/// $$
/// f(v) = -v.
/// $$
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(1)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is `self.dimension()`.
///
/// # Examples
/// ```
/// use core::str::FromStr;
/// use malachite_q::rational_vector::RationalVector;
///
/// let v = RationalVector::from_str("(1/2, -3, 2/3)").unwrap();
/// assert_eq!((-v).to_string(), "(-1/2, 3, -2/3)");
/// assert_eq!((-RationalVector::from_str("()").unwrap()).to_string(), "()");
/// ```
#[inline]
fn neg(mut self) -> Self {
self.neg_assign();
self
}
}
impl Neg for &RationalVector {
type Output = RationalVector;
/// Negates a [`RationalVector`], taking it by reference.
///
/// Every element is negated, so the dimension is unchanged.
///
/// $$
/// f(v) = -v.
/// $$
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(n)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is the total number of bits of the
/// elements' numerators and denominators.
///
/// # Examples
/// ```
/// use core::str::FromStr;
/// use malachite_q::rational_vector::RationalVector;
///
/// let v = RationalVector::from_str("(1/2, -3, 2/3)").unwrap();
/// assert_eq!((-&v).to_string(), "(-1/2, 3, -2/3)");
/// ```
#[inline]
fn neg(self) -> RationalVector {
RationalVector {
elements: self.elements.iter().map(|x| -x).collect(),
}
}
}
impl NegAssign for RationalVector {
/// Negates a [`RationalVector`] in place.
///
/// $$
/// v \gets -v.
/// $$
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(1)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is `self.dimension()`.
///
/// # Examples
/// ```
/// use core::str::FromStr;
/// use malachite_base::num::arithmetic::traits::NegAssign;
/// use malachite_q::rational_vector::RationalVector;
///
/// let mut v = RationalVector::from_str("(1/2, -3, 2/3)").unwrap();
/// v.neg_assign();
/// assert_eq!(v.to_string(), "(-1/2, 3, -2/3)");
/// ```
#[inline]
fn neg_assign(&mut self) {
for x in &mut self.elements {
x.neg_assign();
}
}
}