std::chrono::clock_cast

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

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

  • 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

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