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Thi defines a variable template for the internal __is_duration helper trait, defines a new __is_time_point_v variable template (to be used in a subsequent commit), and adds explicit specializations of the standard chrono::treat_as_floating_point trait for common types. A fast path is added to chrono::duration_cast for the no-op case where no conversion is needed. Finally, some SFINAE constraints are simplified by using the __enable_if_t alias, or by using variable templates. libstdc++-v3/ChangeLog: * include/bits/chrono.h (__is_duration_v, __is_time_point_v): New variable templates. (duration_cast): Add simplified definition for noconv case. (treat_as_floating_point_v): Add explicit specializations. (duration::operator%=, floor, ceil, round): Simplify SFINAE constraints.
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