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libtemporal: correct the definition of std::numeric_limits<Beats>::max(). Comment in code contains details.

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Paul Davis 2021-02-13 21:57:00 -07:00
parent cb66ae496c
commit 1af74f7398
1 changed files with 14 additions and 4 deletions
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18
libs/temporal/temporal/beats.h
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@ -324,12 +324,22 @@ namespace std {
return Temporal::Beats(std::numeric_limits<int32_t>::min(), std::numeric_limits<int32_t>::min());
}
/* We don't define min() since this has different behaviour for integral and floating point types,
but Beats is used as both. Better to avoid providing a min at all
than a confusing one. */
/* We don't define min() since this has different behaviour for
integral and floating point types, but Beats is used as both
an integral and "fractional" value, so the semantics of
min() would be unclear.
Better to avoid providing a min at all than a confusing one.
*/
/* We must make the number of beats be 1 less than INT32_MAX,
* because otherwise adding the PPQN-1 ticks would cause
* overflow (the value would be INT32_MAX+((PPQN-1)/PPQN) which
* exceeds INT32_MAX.
*/
static Temporal::Beats max() {
return Temporal::Beats(std::numeric_limits<int32_t>::max(), Temporal::Beats::PPQN-1);
return Temporal::Beats(std::numeric_limits<int32_t>::max() - 1, Temporal::Beats::PPQN - 1);
}
};