std::chrono::year_month_day::year_month_day(3) | C++ Standard Libary | std::chrono::year_month_day::year_month_day(3) |
NAME¶
std::chrono::year_month_day::year_month_day - std::chrono::year_month_day::year_month_day
Synopsis¶
year_month_day() = default; (1) (since C++20)
constexpr year_month_day( const std::chrono::year& y,
const std::chrono::month& m, (2) (since C++20)
const std::chrono::day& d ) noexcept;
constexpr year_month_day( const std::chrono::year_month_day_last&
(3) (since C++20)
ymdl ) noexcept;
constexpr year_month_day( const std::chrono::sys_days& dp ) (4)
(since C++20)
noexcept;
explicit constexpr year_month_day( const std::chrono::local_days&
(5) (since C++20)
dp ) noexcept;
Constructs a year_month_day object.
1) Default constructor leaves the date uninitialized.
2) Constructs a year_month_day object that stores the year y, month m and day
d.
3) Constructs a year_month_day object that stores the year ymdl.year(), month
ymdl.month() and day ymdl.day().
4) Constructs a year_month_day object that represent the same date as the one
represented by dp.
5) Constructs a year_month_day object that represent the same date as the one
represented by dp, as if by
year_month_day(sys_days(dp.time_since_epoch())).
Constructors (3-4) define implicit conversions from
std::chrono::year_month_day_last
and std::chrono::sys_days, respectively.
For any year_month_day object ymd representing a valid date (ymd.ok() ==
true),
converting ymd to sys_days and back yields the same value.
Notes¶
A year_month_day can also be created by combining one of the
partial-date types
std::chrono::year_month and std::chrono::month_day with the missing component
(day
and year, respectively) using operator/.
See also¶
operator/ conventional syntax for Gregorian calendar date
creation
(C++20) (function)
2022.07.31 | http://cppreference.com |