std::chrono::clock_cast (3) - Linux Man Pages

std::chrono::clock_cast: std::chrono::clock_cast

NAME

std::chrono::clock_cast - std::chrono::clock_cast

Synopsis


Defined in header <chrono>
template <class Dest, class Source, class Duration> (since C++20)
auto clock_cast(const std::chrono::time_point<Source, Duration>& t);


Converts the time point t of a clock Source to an equivalent time point of the clock Dest, using std::chrono::system_clock and/or std::chrono::utc_clock as intermediaries if necessary.


* If the expression std::chrono::clock_time_conversion<Dest, Source>{}(t) is well-formed, returns the result of that expression.
* Otherwise, if at least one of the following two expressions are well-formed, then


      * If both expression are well-formed, the conversion is ambiguous, and the program is ill-formed.
      * Otherwise, exactly one of the two expressions is well-formed; the result of that expression is returned.


1) std::chrono::clock_time_conversion<Dest, std::chrono::system_clock>{}(
std::chrono::clock_time_conversion<std::chrono::system_clock, Source>{}(t))
2) std::chrono::clock_time_conversion<Dest, std::chrono::utc_clock>{}(
std::chrono::clock_time_conversion<std::chrono::utc_clock, Source>{}(t))


* Otherwise, if at least one of the following two expressions are well-formed, then


      * If both expression are well-formed, the conversion is ambiguous, and the program is ill-formed.
      * Otherwise, exactly one of the two expressions is well-formed; the result of that expression is returned.


1) std::chrono::clock_time_conversion<Dest, std::chrono::utc_clock>{}(
std::chrono::clock_time_conversion<std::chrono::utc_clock, std::chrono::system_clock>{}(
std::chrono::clock_time_conversion<std::chrono::system_clock, Source>{}(t)))
2) std::chrono::clock_time_conversion<Dest, std::chrono::system_clock>{}(
std::chrono::clock_time_conversion<std::chrono::system_clock, std::chrono::utc_clock>{}(
std::chrono::clock_time_conversion<std::chrono::utc_clock, Source>{}(t)))


* Otherwise, this function does not participate in overload resolution.

Return value


The result of the conversion, determined as described above.

Example


 This section is incomplete
 Reason: no example

See also


clock_time_conversion traits class defining how to convert time points of one clock to another
                      (class template)
(C++20)