Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Make overflowing and wrapping negation const #58044

Merged
merged 6 commits into from
Feb 20, 2019
Merged

Make overflowing and wrapping negation const #58044

Changes from 2 commits
Commits
Show all changes
6 commits
Select commit Hold shift + click to select a range
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
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
14 changes: 5 additions & 9 deletions src/libcore/num/mod.rs
View file
Open in desktop
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())
Lokathor marked this conversation as resolved.
Show resolved Hide resolved
}
}

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