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Showing content from http://en.cppreference.com/w/cpp/../cpp/../cpp/../cpp/symbol_index/../chrono/time_point/round.html below:

Returns the nearest time point to tp representable in ToDuration, rounding to even in halfway cases.

The function does not participate in the overload resolution unless ToDuration is a specialization of std::chrono::duration and std::chrono::treat_as_floating_point_v<typename ToDuration::rep> is false.

[edit] Parameters tp - time point to round to nearest [edit] Return value

tp rounded to nearest time point using duration of type ToDuration, rounding to even in halfway cases.

[edit] Possible implementation [edit] Example

Output:

Time point	Cast	Floor	Round	Ceil
(ms)		(s)	(s)	(s)	(s)
5432		5	5	5	6
5678		5	5	6	6

[edit] See also

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