Tracking Issue for unsigned_signed_diff

[davidzeng0]

Feature gate: #![feature(unsigned_signed_diff)]

This is a tracking issue for rust-lang/libs-team#381

Public API

impl uX {
        pub const fn overflowing_signed_diff(self, rhs: Self) -> (iX, bool);
	pub const fn saturating_signed_diff(self, rhs: Self) -> iX;
	pub const fn checked_signed_diff(self, rhs: Self) -> Option<iX>;
}

Steps / History

• Implementation: Implement unsigned_signed_diff #126042
• Final comment period (FCP)¹
• Stabilization PR

Unresolved Questions

• None yet.

Footnotes

1. https://std-dev-guide.rust-lang.org/feature-lifecycle/stabilization.html ↩

[davidzeng0]

For completeness, I could also implement rust-lang/libs-team#381 (comment)

impl iX {
    fn checked_unsigned_diff(self, rhs: Self) -> Option<uX>;
}

[pitaj]

checked_unsigned_diff should be under a separate feature and proposed as a new ACP.

Also, the overflowing, wrapping, saturating, and strict versions of this function are not implemented yet.

[loudjanilef]

Hi,
In the the associated PR #126042, the author was asked to remove the overflowing, wrapping, and saturating versions.
The associated PR was added to the 1.82 milestone and the 1.87 is now in beta.
There was no activity on this issue for a long time, should this feature enter in FCP?