`round`/`floor`/`ceil` with an integer representation built a one-unit
delta via `representation_values<Rep>::one() * reference`. That operator
is `[[deprecated]]` for offset units (e.g. temperatures) because such a
product is ambiguous between a point and a delta, so calling these
functions on `deg_C`/`deg_F` quantities triggered a deprecation warning
(a hard error under `-Werror=deprecated-declarations`).
Replace the pattern with the explicit two-argument `quantity{value,
reference}` constructor (the delta interpretation, matching what `delta`
does internally) everywhere it appeared:
- `math.h`: `floor`, `ceil`, `round`
- `bits/sudo_cast.h`: the zero-delta used in quantity_point conversions,
where the reference is genuinely an offset unit for temperature points
- `utility/random.h`: all distributions, whose `Q` is always a delta
Add regression tests exercising `floor`/`ceil`/`round` on integer
`deg_C` deltas (including negatives and round-half-to-even) plus the
originally reported `round<deg_F>(delta<deg_C>(1))` case.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Replace runtime unit access (q.unit) with compile-time type extraction
(get_unit(R)) in the inverse function implementation. This prevents the
function from becoming an immediate function when consteval unit operators
are used, allowing inverse to work with runtime variables.
Key changes:
- math.h: Use get_unit(R) instead of q.unit in both code paths
- test: Add comprehensive runtime inverse tests
This surgical fix preserves maximum compile-time optimization while
enabling DSP applications that need runtime inverse calculations.
Fixes compilation error with Clang:
"call to immediate function 'inverse' is not a constant expression"
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
Mateusz Pusz
Roth Michaels
Yves Delley
Nebojsa Cvetkovic