bjoernager/rust
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Add IterBytes impls for float/f32/f64. This allows creating

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HashMaps with floats as keys.
This commit is contained in:
gareth 2013-06-15 17:58:38 +01:00
parent eac0200f18
commit d22f417c74
2 changed files with 41 additions and 0 deletions
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30
src/libstd/to_bytes.rs
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@ -14,6 +14,7 @@ The `ToBytes` and `IterBytes` traits
*/
use cast;
use io;
use io::Writer;
use option::{None, Option, Some};
@ -190,6 +191,35 @@ impl IterBytes for int {
}
}
impl IterBytes for float {
#[inline(always)]
fn iter_bytes(&self, lsb0: bool, f: Cb) -> bool {
(*self as f64).iter_bytes(lsb0, f)
}
}
impl IterBytes for f32 {
#[inline(always)]
fn iter_bytes(&self, lsb0: bool, f: Cb) -> bool {
let i: u32 = unsafe {
// 0.0 == -0.0 so they should also have the same hashcode
cast::transmute(if *self == -0.0 { 0.0 } else { *self })
};
i.iter_bytes(lsb0, f)
}
}
impl IterBytes for f64 {
#[inline(always)]
fn iter_bytes(&self, lsb0: bool, f: Cb) -> bool {
let i: u64 = unsafe {
// 0.0 == -0.0 so they should also have the same hashcode
cast::transmute(if *self == -0.0 { 0.0 } else { *self })
};
i.iter_bytes(lsb0, f)
}
}
impl<'self,A:IterBytes> IterBytes for &'self [A] {
#[inline(always)]
fn iter_bytes(&self, lsb0: bool, f: Cb) -> bool {