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

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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};.

(none)

1,3) A reference to thisday after modification.

2,4) A copy of theday made before modification.

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

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));}

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

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