mikros/rust
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Clean up some trait impls in core::num.

Browse Source 
This removes the special casing for `float`s where it was not necessary, as
`-0.0 == 0.0`.
This commit is contained in:
Tobias Bucher 2014-07-13 16:55:55 +02:00
parent 915fb2b39c
commit 737d92e11f
1 changed files with 7 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
src/libcore/num/mod.rs
View File

@ -75,6 +75,7 @@ pub trait Zero: Add<Self, Self> {
fn zero() -> Self; fn zero() -> Self;
/// Returns `true` if `self` is equal to the additive identity. /// Returns `true` if `self` is equal to the additive identity.
#[inline]
fn is_zero(&self) -> bool; fn is_zero(&self) -> bool;
} }
@ -89,23 +90,11 @@ macro_rules! zero_impl(
} }
) )
macro_rules! zero_float_impl(
($t:ty, $v:expr) => {
impl Zero for $t {
#[inline]
fn zero() -> $t { $v }
#[inline]
fn is_zero(&self) -> bool { *self == $v || *self == -$v }
}
}
)
zero_impl!(uint, 0u) zero_impl!(uint, 0u)
zero_impl!(u8, 0u8) zero_impl!(u8, 0u8)
zero_impl!(u16, 0u16) zero_impl!(u16, 0u16)
zero_impl!(u32, 0u32) zero_impl!(u32, 0u32)
zero_impl!(u64, 0u64) zero_impl!(u64, 0u64)
zero_impl!(int, 0i) zero_impl!(int, 0i)
zero_impl!(i8, 0i8) zero_impl!(i8, 0i8)
@ -113,8 +102,8 @@ zero_impl!(i16, 0i16)
zero_impl!(i32, 0i32) zero_impl!(i32, 0i32)
zero_impl!(i64, 0i64) zero_impl!(i64, 0i64)
zero_float_impl!(f32, 0.0f32) zero_impl!(f32, 0.0f32)
zero_float_impl!(f64, 0.0f64) zero_impl!(f64, 0.0f64)
/// Returns the additive identity, `0`. /// Returns the additive identity, `0`.
#[inline(always)] pub fn zero<T: Zero>() -> T { Zero::zero() } #[inline(always)] pub fn zero<T: Zero>() -> T { Zero::zero() }