Tracking Issue for integer_sign_cast · Issue #125882 · rust-lang/rust (original) (raw)
Feature gate: #![feature(integer_sign_cast)]
This is a tracking issue for explicit signedness casting methods for integer primitive types. Libs discussion: rust-lang/libs-team#359.
Public API
(for N in [8, 16, 32, 64, 128, size]):
impl uN { pub const fn cast_signed(self) -> iN {} }
impl iN { pub const fn cast_unsigned(self) -> uN {} }
impl NonZero { pub const fn cast_signed(self) -> NonZero {} }
impl NonZero { pub const fn cast_unsigned(self) -> NonZero {} }
Steps / History
- Implementation: Implement feature integer_sign_cast #125884
- Final comment period (FCP)1
- Stabilization PR
Unresolved Questions
Mostly bikeshedding regarding naming, as mentioned in the Libs discussion. The current proposal follows the naming of cast_const and cast_mut for pointers.
Alternatively, these could be implemented as from_bits and to_bits methods for the signed types.