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Deduction guides for std::chrono::zoned_time - cppreference.com

C++ Compiler support Freestanding and hosted Language Standard library Standard library headers Named requirements Feature test macros (C++20) Language support library Concepts library (C++20) Diagnostics library Memory management library Metaprogramming library (C++11) General utilities library Containers library Iterators library Ranges library (C++20) Algorithms library Strings library Text processing library Numerics library Date and time library Input/output library Filesystem library (C++17) Concurrency support library (C++11) Execution control library (C++26) Technical specifications Symbols index External libraries [edit] Date and time library Time point time_point

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Duration duration

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chrono I/O parse

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Time zone tzdb

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tzdb_list

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get_tzdbget_tzdb_listreload_tzdbremote_version

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sys_info

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nonexistent_local_time

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ambiguous_local_time

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locate_zone

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current_zone

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time_zone

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choose

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zoned_traits

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zoned_time

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time_zone_link

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leap_second

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leap_second_info

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get_leap_second_info

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C-style date and time [edit] std::chrono::zoned_time Member functions zoned_time::zoned_time zoned_time::operator= zoned_time::get_time_zone zoned_time::get_sys_timezoned_time::operator sys_time zoned_time::get_local_timezoned_time::operator local_time zoned_time::get_info Nonmember functions operator== operator<< Helper classes formatter<std::chrono::zoned_time> hash<std::chrono::zoned_time>

(C++26)

Deduction guides [edit] 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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