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use crate::natural::Natural;
use malachite_base::num::arithmetic::traits::Sign;
use std::cmp::Ordering;
impl Sign for Natural {
/// Compares a [`Natural`] to zero.
///
/// Returns `Greater` or `Equal` depending on whether the [`Natural`] is positive or zero,
/// 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_nz::natural::Natural;
/// use std::cmp::Ordering;
///
/// assert_eq!(Natural::ZERO.sign(), Ordering::Equal);
/// assert_eq!(Natural::from(123u32).sign(), Ordering::Greater);
/// ```
fn sign(&self) -> Ordering {
if *self == 0 {
Ordering::Equal
} else {
Ordering::Greater
}
}
}