std::chrono::is_clock

(C++11)

(C++20)

(C++11)

system_clock (C++11)
steady_clock (C++11)
high_resolution_clock (C++11)

is_clock (C++20)
utc_clock (C++20)
tai_clock (C++20)

gps_clock (C++20)
file_clock (C++20)
local_t (C++20)

is_amis_pm

(C++20)(C++20)

make12make24

(C++20)(C++20)

hh_mm_ss (C++20)

day (C++20)
month (C++20)
year (C++20)
weekday (C++20)
operator/ (C++20)
year_month_day (C++20)

year_month_day_last (C++20)
year_month_weekday (C++20)
year_month_weekday_last (C++20)
weekday_indexed (C++20)
weekday_last (C++20)
month_day (C++20)

month_day_last (C++20)
month_weekday (C++20)
month_weekday_last (C++20)
year_month (C++20)
last_speclast (C++20)(C++20)

tzdb (C++20)
tzdb_list (C++20)
get_tzdbget_tzdb_listreload_tzdbremote_version (C++20)(C++20)(C++20)(C++20)
sys_info (C++20)

local_info (C++20)
nonexistent_local_time (C++20)
ambiguous_local_time (C++20)
locate_zone (C++20)
current_zone (C++20)
time_zone (C++20)
choose (C++20)

zoned_traits (C++20)
zoned_time (C++20)
time_zone_link (C++20)
leap_second (C++20)
leap_second_info (C++20)
get_leap_second_info (C++20)

/ chrono

parse

(C++20)

C

[edit]

`<chrono>`
`template< class T > struct is_clock;`		( C++20)

T Clock, value, true. value false.

, , Clock, , , T Clock, :

T::rep, T::period, T::duration T::time_point , ;
T::is_steady T::now() , .

, std::is_clock std::is_clock_v .

T

`template< class T > inline constexpr bool is_clock_v = is_clock<T>::value;`		( C++20)

[edit]

std::integral_constant

value

[static]

true, T Clock , false
(public static -)

-

operator bool	`bool`, `value` (public -)
operator() (C++14)	`value` (public -)



`value_type`	`bool`
`type`	`std::integral_constant<bool, value>`

template<class>
struct is_clock : std::false_type {};

template<class T>
    requires
        requires {
            typename T::rep;
            typename T::period;
            typename T::duration;
            typename T::time_point;
            T::is_steady;
            T::now();
        }
struct is_clock<T> : std::true_type {};

#include <chrono>
#include <ratio>

int main()
{
    static_assert
    (
        std::chrono::is_clock_v<std::chrono::utc_clock>
        and
        not std::chrono::is_clock_v<std::chrono::duration<int, std::exa>>
    );
}

}}

cppreference.com

std::chrono::is_clock

std::integral_constant

-