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

 

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

 

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

 

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)

 

constexprstd::chrono::day& operator++()noexcept;	(1)	(since C++20)
constexprstd::chrono::day operator++(int)noexcept;	(2)	(since C++20)
constexprstd::chrono::day& operator--()noexcept;	(3)	(since C++20)
constexprstd::chrono::day operator--(int)noexcept;	(4)	(since C++20)

Adds or subtracts 1 from the day value.

1,2) Performs *this +=std::chrono::days{1};.

3,4) Performs *this -=std::chrono::days{1};.

Parameters

(none)

Return value

1,3) A reference to this day after modification.

2,4) A copy of the day made before modification.

Notes

If the result would be outside the range [​0​, 255], the actual stored value is unspecified.

Example

Run this code

#include <cassert>#include <chrono>   int main(){std::chrono::day d{15};   ++d;assert(d ==std::chrono::day(16));   --d;assert(d ==std::chrono::day(15));}

See also

operator+=operator-=	adds or subtracts a number of days (public member function)
operator+operator- (C++20)	adds or subtracts a number of days and a day, or find the difference between two days (function)