std::chrono::operator+,std::chrono::operator-(std::chrono::day)

From cppreference.com

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 (C++11)
clock_time_conversion (C++20)
clock_cast (C++20)
Duration
duration (C++11)
Clocks
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)
Time of day
is_amis_pm (C++20)(C++20)
make12make24 (C++20)(C++20)
hh_mm_ss (C++20)

Calendar
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)

Time zone
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-style date and time

[edit]

std::chrono::day

Member functions
day::day
day::operator++day::operator--
day::operator+=day::operator-=
day::operator unsigned
day::ok
Nonmember functions
operator==operator<=>
operator+operator-
operator<<
from_stream
operator""d
Helper classes
formatter<std::chrono::day>
hash<std::chrono::day> (C++26)

[edit]

Defined in header`<chrono>`
constexprstd::chrono::day operator+(conststd::chrono::day& d, conststd::chrono::days& ds)noexcept;	(1)	(since C++20)
constexprstd::chrono::day operator+(conststd::chrono::days& ds, conststd::chrono::day& d)noexcept;	(2)	(since C++20)
constexprstd::chrono::day operator-(conststd::chrono::day& d, conststd::chrono::days& ds)noexcept;	(3)	(since C++20)
constexprstd::chrono::days operator-(conststd::chrono::day& x, conststd::chrono::day& y)noexcept;	(4)	(since C++20)

1,2) Addsds.count() days tod.

3) Subtractsds.count() days fromd.

4) Calculate the difference, in days, between twodayx andy.

[edit]Return value

1,2)std::chrono::day(unsigned(d)+ ds.count())

3)std::chrono::day(unsigned(d)- ds.count())

4)std::chrono::days(int(unsigned(x))-int(unsigned(y)))

[edit]Notes

1-3) If the result would be outside the range[0, 255], the actual stored value is unspecified.

[edit]Example

Run this code

#include <cassert>#include <chrono> int main(){std::chrono::day d{15};     d= d+std::chrono::days(2);assert(d==std::chrono::day(17));     d= d-std::chrono::days(3);assert(d==std::chrono::day(14)); constexprstd::chrono::days ds=std::chrono::day(16)-std::chrono::day(14);    static_assert(ds==std::chrono::days(2));}

[edit]See also

operator++operator++(int)operator--operator--(int)	increments or decrements the day (public member function)[edit]
operator+=operator-=	adds or subtracts a number of days (public member function)[edit]

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/chrono/day/operator_arith_2&oldid=157494"

Movatterモバイル変換

cppreference.com

Namespaces

Variants

Views

Actions

std::chrono::operator+,std::chrono::operator-(std::chrono::day)

Contents

[edit]Return value

[edit]Notes

[edit]Example

[edit]See also

Navigation

Toolbox