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Temporal: add std::numeric_limits<> for timecnt_t and comment on these in general

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This commit is contained in:
Paul Davis 2020-08-10 10:12:07 -06:00
parent 66bcf20950
commit c192c49b65
1 changed files with 30 additions and 9 deletions
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39
libs/temporal/temporal/timeline.h
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@ -386,15 +386,35 @@ class LIBTEMPORAL_API timecnt_t {
*/
namespace std {
template<>
struct numeric_limits<Temporal::timepos_t> {
static Temporal::timepos_t min() {
return Temporal::timepos_t (0);
}
static Temporal::timepos_t max() {
return Temporal::timepos_t (4611686018427387904); /* pow (2,62) */
}
};
/* The utility of these two specializations of std::numeric_limits<> is not
* clear, since both timepos_t and timecnt_t have a time domain, and comparing
* across time domains, while possible, is expensive.
*
* To avoid hidden costs, it seems easier to use timepos_t::max and
* timecnt_t::max although these have a similar fundamental problem.
*/
template<>
struct numeric_limits<Temporal::timepos_t> {
static Temporal::timepos_t min() {
return Temporal::timepos_t (0);
}
static Temporal::timepos_t max() {
return Temporal::timepos_t (4611686018427387904); /* pow (2,62) */
}
};
template<>
struct numeric_limits<Temporal::timecnt_t> {
static Temporal::timecnt_t min() {
return Temporal::timecnt_t (Temporal::superclock_t (0), Temporal::timepos_t (Temporal::superclock_t (0)));
}
static Temporal::timecnt_t max() {
return Temporal::timecnt_t (Temporal::superclock_t (4611686018427387904), Temporal::timepos_t (Temporal::superclock_t (0))); /* pow (2,62) */
}
};
}
@ -438,3 +458,4 @@ inline static bool operator>= (Temporal::Beats const & b, Temporal::timecnt_t co
#undef TEMPORAL_DOMAIN_WARNING
#endif /* __libtemporal_timeline_h__ */