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Make overflowing and wrapping negation const #58044

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Merged
merged 6 commits into from
Feb 20, 2019
Merged

Make overflowing and wrapping negation const #58044

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2f5d245
Make overflowing and wrapping negation const
Lokathor Feb 1, 2019
26a3540
Don't know why I wasn't using `self` properly there
Lokathor Feb 1, 2019
481b354
Simplify the overflowing_neg expression
Lokathor Feb 2, 2019
5256efb
const-int-overflowing.rs += overflowing_neg
Lokathor Feb 2, 2019
31bf7e1
const-int-wrapping.rs += wrapping_neg
Lokathor Feb 2, 2019
e06302f
fix the build errors
Lokathor Feb 2, 2019
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14 changes: 5 additions & 9 deletions src/libcore/num/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1175,7 +1175,7 @@ $EndFeature, "
```"),
#[stable(feature = "num_wrapping", since = "1.2.0")]
#[inline]
pub fn wrapping_neg(self) -> Self {
pub const fn wrapping_neg(self) -> Self {
self.overflowing_neg().0
}
}
Expand Down Expand Up @@ -1529,12 +1529,8 @@ assert_eq!(", stringify!($SelfT), "::MIN.overflowing_neg(), (", stringify!($Self
```"),
#[inline]
#[stable(feature = "wrapping", since = "1.7.0")]
pub fn overflowing_neg(self) -> (Self, bool) {
if self == Self::min_value() {
(Self::min_value(), true)
} else {
(-self, false)
}
pub const fn overflowing_neg(self) -> (Self, bool) {
((self ^ -1).wrapping_add(1), self == Self::min_value())
}
}

Expand Down Expand Up @@ -3017,7 +3013,7 @@ assert_eq!(100", stringify!($SelfT), ".wrapping_rem_euclid(10), 0);
/// ```
#[stable(feature = "num_wrapping", since = "1.2.0")]
#[inline]
pub fn wrapping_neg(self) -> Self {
pub const fn wrapping_neg(self) -> Self {
self.overflowing_neg().0
}

Expand Down Expand Up @@ -3322,7 +3318,7 @@ assert_eq!(2", stringify!($SelfT), ".overflowing_neg(), (-2i32 as ", stringify!(
```"),
#[inline]
#[stable(feature = "wrapping", since = "1.7.0")]
pub fn overflowing_neg(self) -> (Self, bool) {
pub const fn overflowing_neg(self) -> (Self, bool) {
((!self).wrapping_add(1), self != 0)
}
}
Expand Down