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Fix FloatOrd hash being different for different NaN values (#618)

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* Fix FloatOrd hash being different for different NaN values

* Fix FloatOrd hashing +0.0 and -0.0 to different values
This commit is contained in:
Andrew Hickman 2020-10-03 20:56:25 +01:00 committed by GitHub
parent 22a2c88a47
commit 9a4167ef7f
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1 changed files with 9 additions and 1 deletions
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8
crates/bevy_core/src/float_ord.rs
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@ -40,8 +40,16 @@ impl Eq for FloatOrd {}
impl Hash for FloatOrd { impl Hash for FloatOrd {
fn hash<H: Hasher>(&self, state: &mut H) { fn hash<H: Hasher>(&self, state: &mut H) {
if self.0.is_nan() {
// Ensure all NaN representations hash to the same value
state.write(f32::NAN.as_bytes())
} else if self.0 == 0.0 {
// Ensure both zeroes hash to the same value
state.write(0.0f32.as_bytes())
} else {
state.write(self.0.as_bytes()); state.write(self.0.as_bytes());
} }
}
} }
impl Neg for FloatOrd { impl Neg for FloatOrd {