std::common_type(std::chrono::duration)

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template <class Rep1, class Period1, class Rep2, class Period2> struct common_type<std::chrono::duration<Rep1, Period1>, std::chrono::duration<Rep2, Period2>> { typedef std::chrono::duration< typename std::common_type<Rep1, Rep2>::type, /*see note*/> type; };		(dal C++11)

Espone il tipo denominato type, che è il tipo comune di due std::chrono::durations.

Original:

Exposes the type named type, which is the common type of two std::chrono::durations.

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Nota

The period the resulting duration is the greatest common divisor of Period1 and Period2.