# Deduction guides for `std::chrono::zoned_time`

From cppreference.com
< cpp‎ | 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)

Six deduction guides are provided for `zoned_time`. They 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 `TimeZonePtrOrName`.
Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/chrono/zoned_time/deduction_guides&oldid=104868"