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 expressions 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 expressions 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
(C++20) to another
(class template)