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use malachite_base::num::arithmetic::traits::Sign;
use std::cmp::Ordering;
use Rational;
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
/// ```
/// extern crate malachite_base;
///
/// 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(), Ordering::Equal);
/// assert_eq!(Rational::from_signeds(22, 7).sign(), Ordering::Greater);
/// assert_eq!(Rational::from_signeds(-22, 7).sign(), Ordering::Less);
/// ```
fn sign(&self) -> Ordering {
if self.sign {
if self.numerator == 0 {
Ordering::Equal
} else {
Ordering::Greater
}
} else {
Ordering::Less
}
}
}