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

< cpp‎ | chrono‎ | day
constexpr std::chrono::day& operator++() noexcept;
 (1) (since C++20)
constexpr std::chrono::day operator++(int) noexcept;
 (2) (since C++20)
constexpr std::chrono::day& operator--() noexcept;
 (3) (since C++20)
constexpr std::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

#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

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