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// Copyright © 2024 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 malachite_base::num::conversion::traits::IsInteger;
impl<'a> IsInteger for &'a Rational {
/// Determines whether a [`Rational`] is an integer.
///
/// $f(x) = x \in \Z$.
///
/// # Worst-case complexity
/// Constant time and additional memory.
///
/// # Examples
/// ```
/// use malachite_base::num::basic::traits::{One, Zero};
/// use malachite_base::num::conversion::traits::IsInteger;
/// use malachite_q::Rational;
///
/// assert_eq!(Rational::ZERO.is_integer(), true);
/// assert_eq!(Rational::ONE.is_integer(), true);
/// assert_eq!(Rational::from(100).is_integer(), true);
/// assert_eq!(Rational::from(-100).is_integer(), true);
/// assert_eq!(Rational::from_signeds(22, 7).is_integer(), false);
/// assert_eq!(Rational::from_signeds(-22, 7).is_integer(), false);
/// ```
#[inline]
fn is_integer(self) -> bool {
self.denominator == 1u32
}
}