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use std::{
cmp::Ordering,
hash::{Hash, Hasher},
ops::Neg,
};
#[derive(Debug, Copy, Clone, PartialOrd)]
pub struct FloatOrd(pub f32);
#[allow(clippy::derive_ord_xor_partial_ord)]
impl Ord for FloatOrd {
fn cmp(&self, other: &Self) -> Ordering {
self.0.partial_cmp(&other.0).unwrap_or_else(|| {
if self.0.is_nan() && !other.0.is_nan() {
Ordering::Less
} else if !self.0.is_nan() && other.0.is_nan() {
Ordering::Greater
} else {
Ordering::Equal
}
})
}
}
impl PartialEq for FloatOrd {
fn eq(&self, other: &Self) -> bool {
if self.0.is_nan() && other.0.is_nan() {
true
} else {
self.0 == other.0
}
}
}
impl Eq for FloatOrd {}
impl Hash for FloatOrd {
fn hash<H: Hasher>(&self, state: &mut H) {
if self.0.is_nan() {
state.write(&f32::to_ne_bytes(f32::NAN));
} else if self.0 == 0.0 {
state.write(&f32::to_ne_bytes(0.0f32));
} else {
state.write(&f32::to_ne_bytes(self.0));
}
}
}
impl Neg for FloatOrd {
type Output = FloatOrd;
fn neg(self) -> Self::Output {
FloatOrd(-self.0)
}
}