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hack signum as well

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This commit is contained in:
Deadbeef 2023-04-16 07:04:17 +00:00
parent 8cda8df578
commit d88f979437
1 changed files with 5 additions and 2 deletions
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7
library/core/src/num/int_macros.rs
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@ -2603,13 +2603,16 @@ pub const fn abs_diff(self, other: Self) -> $UnsignedT {
#[must_use = "this returns the result of the operation, \ #[must_use = "this returns the result of the operation, \
without modifying the original"] without modifying the original"]
#[inline(always)] #[inline(always)]
#[rustc_allow_const_fn_unstable(const_cmp)]
pub const fn signum(self) -> Self { pub const fn signum(self) -> Self {
// Picking the right way to phrase this is complicated // Picking the right way to phrase this is complicated
// (<https://graphics.stanford.edu/~seander/bithacks.html#CopyIntegerSign>) // (<https://graphics.stanford.edu/~seander/bithacks.html#CopyIntegerSign>)
// so delegate it to `Ord` which is already producing -1/0/+1 // so delegate it to `Ord` which is already producing -1/0/+1
// exactly like we need and can be the place to deal with the complexity. // exactly like we need and can be the place to deal with the complexity.
self.cmp(&0) as _
// FIXME(const-hack): replace with cmp
if self < 0 { -1 }
else if self == 0 { 0 }
else { 1 }
} }
/// Returns `true` if `self` is positive and `false` if the number is zero or /// Returns `true` if `self` is positive and `false` if the number is zero or