Deduction guides for std::chrono::zoned_time

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std::chrono::zoned_time
zoned_time ( ) - > zoned_time < std:: chrono :: seconds > ;
(1) (since C++20)
template < class Duration >

zoned_time ( std:: chrono :: sys_time < Duration > )

- > zoned_time < std:: common_type_t < Duration, std:: chrono :: seconds >> ;
(2) (since C++20)
template < class TimeZonePtrOrName >
zoned_time ( TimeZonePtrOrName && ) - > zoned_time < std:: chrono :: seconds , /* see below */ > ;
(3) (since C++20)
template < class TimeZonePtrOrName, class Duration >

zoned_time ( TimeZonePtrOrName && , std:: chrono :: sys_time < Duration > )

- > zoned_time < std:: common_type_t < Duration, std:: chrono :: seconds > , /* see below */ > ;
(4) (since C++20)
template < class TimeZonePtrOrName, class Duration >

zoned_time ( TimeZonePtrOrName && , std:: chrono :: local_time < Duration > ,
std:: chrono :: choose = std :: chrono :: choose :: earliest )

- > zoned_time < std:: common_type_t < Duration, std:: chrono :: seconds > , /* see below */ > ;
(5) (since C++20)
template < class TimeZonePtrOrName, class Duration, class TimeZonePtr2 >

zoned_time ( TimeZonePtrOrName && , std:: chrono :: zoned_time < Duration, TimeZonePtr2 > ,
std:: chrono :: choose = std :: chrono :: choose :: earliest )

- > zoned_time < std:: common_type_t < Duration, std:: chrono :: seconds > , /* see below */ > ;
(6) (since C++20)

These deduction guides normalize Duration to a minimum resolution of std::chrono::seconds , and provide correct handling for time zone names specified using types convertible to std:: string_view .

3-6) If std:: is_convertible_v < TimeZonePtrOrName, std:: string_view > is true , the deduced second template argument is const std:: chrono :: time_zone * . Otherwise it is std:: remove_cvref_t < TimeZonePtrOrName > .
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