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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;
use core::cmp::Ordering::{self, *};
use malachite_base::num::arithmetic::traits::Sign;
impl Sign for Rational {
/// Compares a [`Rational`] to zero.
///
/// Returns `Greater`, `Equal`, or `Less`, depending on whether the [`Rational`] is positive,
/// zero, or negative, respectively.
///
/// # Worst-case complexity
/// Constant time and additional memory.
///
/// # Examples
/// ```
/// use malachite_base::num::arithmetic::traits::Sign;
/// use malachite_base::num::basic::traits::Zero;
/// use malachite_q::Rational;
/// use std::cmp::Ordering::*;
///
/// assert_eq!(Rational::ZERO.sign(), Equal);
/// assert_eq!(Rational::from_signeds(22, 7).sign(), Greater);
/// assert_eq!(Rational::from_signeds(-22, 7).sign(), Less);
/// ```
fn sign(&self) -> Ordering {
if self.sign {
if self.numerator == 0 { Equal } else { Greater }
} else {
Less
}
}
}