Module rounding 

Division-rounding and related operations: div_ceil, div_floor, exact division, multiple-of computations and overflow-free midpoint, mirroring the inherent methods on the primitive integer types.

Stability in std (as of nightly 2026): div_ceil / next_multiple_of (unsigned) are stable since 1.73, is_multiple_of since 1.87, midpoint since 1.85/1.87; the signed div_ceil / div_floor / next_multiple_of and div_exact / checked_div_exact are still nightly-only. Anything newer than the crate’s MSRV is hand-rolled here with the same algorithm as core.

CT tiers: Midpoint is Tier A (branchless); everything else here is Tier C (division-based).

Traits

DivCeil

Performs division, rounding the quotient towards positive infinity.

DivExact

Performs division without remainder.

DivFloor

Performs division, rounding the quotient towards negative infinity.

Midpoint

Computes the midpoint (average) of two values without overflowing.

MultipleOf

Checks divisibility, mirroring is_multiple_of on the unsigned primitives.

NextMultipleOf

Rounds up to the nearest multiple of a value.