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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 malachite_base::num::arithmetic::traits::{FloorLogBase2, IsPowerOf2};
use malachite_base::num::conversion::traits::ExactFrom;
macro_rules! impl_float {
($t: ident) => {
impl PartialEq<$t> for Rational {
/// Determines whether a [`Rational`] is equal to a primitive float.
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(m) = O(m)$
///
/// where $T$ is time, $M$ is additional memory, $n$ is `max(self.significant_bits(),
/// other.sci_exponent().abs())`, and $m$ is `other.sci_exponent().abs()`.
///
/// # Examples
/// See [here](super::partial_eq_primitive_float#partial_eq).
#[allow(clippy::cmp_owned)]
fn eq(&self, other: &$t) -> bool {
if !other.is_finite() {
false
} else if *other == 0.0 {
*self == 0u32
} else {
*self != 0u32
&& self.sign == (*other > 0.0)
&& self.denominator.is_power_of_2()
&& self.floor_log_base_2_abs() == other.abs().floor_log_base_2()
&& *self == Rational::exact_from(*other)
}
}
}
impl PartialEq<Rational> for $t {
/// Determines whether a primitive float is equal to a [`Rational`].
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(m) = O(m)$
///
/// where $T$ is time, $M$ is additional memory, $n$ is `max(self.sci_exponent().abs(),
/// other.significant_bits())`, and $m$ is `self.sci_exponent().abs()`.
///
/// # Examples
/// See [here](super::partial_eq_primitive_float#partial_eq).
#[inline]
fn eq(&self, other: &Rational) -> bool {
other == self
}
}
};
}
apply_to_primitive_floats!(impl_float);