feat: add precise integer time (TimeDuration, TimeStamp) - #31
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Add the opt-in header utl/time_point.hpp with TimeDuration and TimeStamp: nanosecond-native int64 wrappers over Time<int64_t> with affine semantics (TimeStamp - TimeStamp -> TimeDuration, TimeStamp +/- TimeDuration -> TimeStamp, TimeStamp + TimeStamp deleted), scaling and comparison operators, the nanoseconds/microseconds/milliseconds/seconds factories, and a to_time() bridge to the dimensional Time<double> (seconds). These types deliberately avoid inv()/sqrt/float division and are not pulled in by utl.hpp, so the existing floating-point unit machinery and the single-header amalgamation are unaffected. Documented in the user guide. First piece of the v4.0.0 precise-time roadmap; chrono interop follows.
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FUTURE_WORK v4.0.0 — first piece of the precise-time roadmap.
Opt-in
utl/time_point.hppadds two nanosecond-native (int64) wrappers overTime<int64_t>:TimeDuration—+,-, unary-, integer scaling*//, comparisons;ns()/us()/ms()/s()integer accessors;to_time() -> Time<double>seconds bridge;nanoseconds/microseconds/milliseconds/secondsfactories.TimeStamp— affine point:Stamp - Stamp -> TimeDuration,Stamp +/- TimeDuration -> Stamp, comparisons, andStamp + Stampdeleted (adding absolute times is meaningless).Per the agreed design: native integer mode, no
inv()/sqrt/float ops, and it does not affect existing functionality —utl.hppdoes not include it, so the float/double unit machinery and the single-header amalgamation are untouched.Absolute<Unit>was dropped as unnecessary.New test
t_time_point. Verified: build (Werror), 49 tests, clang-format, single-header--checkin sync, mdbook;TimeStamp + TimeStampconfirmed rejected.chrono interop is the next PR.