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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::InnerFloat::{Finite, Infinity, NaN, Zero};
use crate::{ComparableFloat, ComparableFloatRef, Float};
use core::hash::{Hash, Hasher};
impl Hash for ComparableFloat {
/// Computes a hash of a `ComparableFloat`.
///
/// The hash is compatible with `ComparableFloat` equality: all `NaN`s hash to the same value.
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(1)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is `self.significant_bits()`.
#[inline]
fn hash<H: Hasher>(&self, state: &mut H) {
self.as_ref().hash(state);
}
}
impl Hash for ComparableFloatRef<'_> {
/// Computes a hash of a `ComparableFloatRef`.
///
/// The hash is compatible with `ComparableFloatRef` equality: all `NaN`s hash to the same
/// value.
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(1)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is `self.significant_bits()`.
fn hash<H: Hasher>(&self, state: &mut H) {
match self.0 {
float_nan!() => "NaN".hash(state),
Float(Infinity { sign }) => {
if *sign {
"Infinity".hash(state);
} else {
"-Infinity".hash(state);
}
}
Float(Zero { sign }) => {
if *sign {
"0.0".hash(state);
} else {
"-0.0".hash(state);
}
}
Float(Finite {
sign,
exponent,
precision,
significand,
}) => {
sign.hash(state);
exponent.hash(state);
precision.hash(state);
significand.hash(state);
}
}
}
}