std::chrono::year::operator++, std::chrono::year::operator--

 

C++

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Feature test macros (C++20)

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General utilities Date and time Function objects Formatting library (C++20) bitset hash (C++11) Relational operators (deprecated in C++20) rel_ops::operator!=rel_ops::operator> rel_ops::operator<=rel_ops::operator>= Integer comparison functions cmp_equalcmp_lesscmp_less_than (C++20)(C++20)(C++20)    cmp_not_equalcmp_greatercmp_greater_than (C++20)(C++20)(C++20) in_range (C++20) Swap and type operations swap ranges::swap (C++20) exchange (C++14) declval (C++11) to_underlying (C++23) forward (C++11) forward_like (C++23) move (C++11) move_if_noexcept (C++11) as_const (C++17) Common vocabulary types pair tuple (C++11) optional (C++17) any (C++17) variant (C++17) tuple_size (C++11) tuple_element (C++11) apply (C++17) make_from_tuple (C++17) expected (C++23) Elementary string conversions to_chars (C++17) from_chars (C++17) chars_format (C++17)

 

Date and time utilities

Time point
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duration (C++11)
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Time of day
is_amis_pm (C++20)(C++20)	make12make24 (C++20)(C++20)	hh_mm_ss (C++20)
Calendars
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)
Time zones
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chrono I/O
parse (C++20)
C-style date and time

 

std::chrono::year

Member functions

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

Nonmember functions

operator==operator<=>

operator+operator-

operator<<

from_stream

Helper classes

formatter<std::chrono::year>

 

constexpr std::chrono::year& operator++() noexcept;	(1)	(since C++20)
constexpr std::chrono::year operator++(int) noexcept;	(2)	(since C++20)
constexpr std::chrono::year& operator--() noexcept;	(3)	(since C++20)
constexpr std::chrono::year operator--(int) noexcept;	(4)	(since C++20)

Adds or subtracts 1 from the year value.

1-2) Performs *this += std::chrono::years{1};

3-4) Performs *this -= std::chrono::years{1};

Parameters

(none)

Return value

1,3) a reference to this year after modification

2,4) a copy of the year made before modification

Notes

If the result would be outside the range [-32767, 32767], the actual stored value is unspecified.

Example

Run this code

#include <iostream>
#include <chrono>
 
int main()
{
    std::cout << std::boolalpha;
 
    std::chrono::year y {2020};
    std::cout << (++y == std::chrono::year(2021)) << ' ';
    std::cout << (--y == std::chrono::year(2020)) << '\n';
 
    using namespace std::literals::chrono_literals;
    y = 32767y;
    y++; //< unspecified, see Notes
    std::cout << static_cast<int>(y) << '\n';
}

Possible output:

true true
-32768

See also

operator+=operator-=	adds or subtracts a number of years from a year (public member function)
operator+operator- (C++20)	performs arithmetic on years (function)