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std::chrono::choose(3) C++ Standard Libary std::chrono::choose(3)


std::chrono::choose - std::chrono::choose


Defined in header <chrono>
enum class choose {

earliest, (since C++20)


The scoped enumeration choose can be passed to certain member functions of
std::chrono::time_zone and std::chrono::zoned_time to control how ambiguous or
nonexistent local times should be resolved. Passing choose::earliest causes the
earlier time point to be returned, while passing choose::latest causes the later
time point to be returned. (For nonexistent local times, these two time points are

If a choose is not passed and an ambiguous or nonexistent local time is encountered,
a std::chrono::ambiguous_local_time or std::chrono::nonexistent_local_time exception
(as applicable) will be thrown.

See also

constructs a zoned_time
constructor (public member function of
to_sys converts a local_time in this time zone to a sys_time
(public member function of std::chrono::time_zone)