std::chrono::weekday::operator+=, std::chrono::weekday::operator-=

C++

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Language support library

Concepts library (C++20)

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Technical Specifications

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rel_ops::operator!=rel_ops::operator>rel_ops::operator<=rel_ops::operator>=
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strong_order weak_order partial_order strong_equal weak_equal	strong_ordering weak_ordering partial_ordering strong_equality weak_equality	is_eqis_neqis_ltis_lteqis_gtis_gteq
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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)
Time zones
tzdb (C++20) tzdb_list (C++20) get_tzdbget_tzdb_listreload_tzdbremote_version (C++20)(C++20)(C++20)(C++20)	time_zone (C++20) locate_zone (C++20) current_zone (C++20) zoned_time (C++20) link (C++20) leap (C++20)
C-style date and time

std::chrono::weekday

Member functions

weekday::weekday

weekday::operator++weekday::operator--

weekday::operator+=weekday::operator-=

weekday::operator unsigned

weekday::ok

weekday::operator[]

Nonmember functions

operator==operator!=

operator+operator-

operator<<

to_stream

from_stream

constexpr std::chrono::weekday& operator+=(const std::chrono::days& d) noexcept;	(1)	(since C++20)
constexpr std::chrono::weekday& operator-=(const std::chrono::days& d) noexcept;	(2)	(since C++20)

Adds or subtracts d.count() from the weekday value, reducing the result modulo 7 to an integer in the range [0, 6].

1) Performs *this = *this + d;

2) Performs *this = *this - d;

Return value

A reference to this weekday after modification.

Notes

After a call to one of these functions, ok() is always true if no overflow occurred during the operation.

See also

operator++operator++(int)operator--operator--(int)	increments or decrements the weekday (public member function)
operator+operator-	performs arithmetic on weekdays (function)