std::chrono::year::operator int

 

C++

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Feature test macros (C++20)

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Concepts library (C++20)

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元编程库 (C++11)

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Ranges library (C++20)

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数值库

日期和时间库

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Filesystem library (C++17)

并发支持库 (C++11)

Execution control library (C++26)

技术规范

符号索引

外部库

 

日期和时间库

时间点 time_point (C++11) clock_time_conversion (C++20)   clock_cast (C++20) 时长 duration (C++11) 时钟 system_clock (C++11) steady_clock (C++11) is_clock (C++20) utc_clock (C++20) tai_clock (C++20) high_resolution_clock (C++11) gps_clock (C++20) file_clock (C++20) local_t (C++20) 一天中的时间 is_amis_pm (C++20)(C++20) make12make24 (C++20)(C++20) hh_mm_ss (C++20)

日历 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) chrono I/O parse (C++20)

时区 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) C 风格日期和时间

 

std::chrono::year

成员函数

year::year

year::operator++year::operator--

year::operator+=year::operator-=

year::operator+year::operator-

year::is_leap

year::operator int

year::ok

year::min

year::max

非成员函数

operator==operator<=>

operator+operator-

operator<<

from_stream

operator""y

辅助类

formatter<std::chrono::year>

hash<std::chrono::year> (C++26)

 

constexpr explicit operator int() const noexcept;		(since C++20)

返回存储在 *this 中的年份值。

返回值

存储在 *this 中的年份值。

示例

运行此代码

#include <chrono>
#include <iostream>
using namespace std::chrono;
 
int main()
{
    constexpr std::chrono::year y{2020};
    std::cout << "The year is: " << static_cast<int>(y) << '\n';
 
    const year_month_day ymd{floor<days>(system_clock::now())};
    const std::chrono::year this_year{ymd.year()};
    std::cout << "This year is: " << int(this_year) << '\n';
}

可能的输出

The year is: 2020
This year is: 2023