std::chrono::clock_cast

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< cpp‎ | chrono
 
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chrono I/O
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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 哋它亢++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 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

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