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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::Float;
use crate::InnerFloat::{Finite, Zero};
use core::cmp::Ordering::*;
use malachite_base::num::logic::traits::SignificantBits;
use malachite_nz::natural::Natural;
impl PartialEq<Natural> for Float {
/// Determines whether a [`Float`] is equal to a [`Natural`].
///
/// Infinity, negative infinity, and NaN are not equal to any [`Natural`]. Both the [`Float`]
/// zero and the [`Float`] negative zero are equal to the [`Natural`] zero.
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(1)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is `min(self.significant_bits(),
/// other.significant_bits())`.
///
/// # Examples
/// ```
/// use malachite_base::num::basic::traits::{One, OneHalf};
/// use malachite_float::Float;
/// use malachite_nz::natural::Natural;
///
/// assert!(Float::from(123) == Natural::from(123u32));
/// assert!(Float::ONE_HALF != Natural::ONE);
/// ```
fn eq(&self, other: &Natural) -> bool {
match self {
float_either_zero!() => *other == 0u32,
Float(Finite {
sign,
exponent,
significand,
..
}) => {
*sign
&& *other != 0u32
&& *exponent >= 0
&& other.significant_bits() == exponent.unsigned_abs()
&& significand.cmp_normalized(other) == Equal
}
_ => false,
}
}
}
impl PartialEq<Float> for Natural {
/// Determines whether a [`Natural`] is equal to a [`Float`].
///
/// No [`Natural`] is equal to infinity, negative infinity, or NaN. The [`Natural`] zero is
/// equal to both the [`Float`] zero and the [`Float`] negative zero.
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(1)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is `min(self.significant_bits(),
/// other.significant_bits())`.
///
/// # Examples
/// ```
/// use malachite_base::num::basic::traits::{One, OneHalf};
/// use malachite_float::Float;
/// use malachite_nz::natural::Natural;
///
/// assert!(Natural::from(123u32) == Float::from(123));
/// assert!(Natural::ONE != Float::ONE_HALF);
/// ```
#[inline]
fn eq(&self, other: &Float) -> bool {
other == self
}
}