std::chrono::weekday::operator++, std::chrono::weekday::operator--
constexpr std::chrono::weekday& operator++() noexcept; |
(1) | (since C++20) |
constexpr std::chrono::weekday operator++(int) noexcept; |
(2) | (since C++20) |
constexpr std::chrono::weekday& operator--() noexcept; |
(3) | (since C++20) |
constexpr std::chrono::weekday operator--(int) noexcept; |
(4) | (since C++20) |
Adds or subtracts 1 from the weekday value, reducing the result modulo 7 to an integer in the range [0, 6].
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
weekday
after modification
2,4) a copy of the
weekday
made before modification
Notes
After a call to one of these functions, ok()
is always true.
Example
#include <iostream> #include <chrono> int main() { std::cout << std::boolalpha; std::chrono::weekday wd {0}; // Sunday is 0 or 7 --wd; std::cout << (wd == std::chrono::Saturday) << ' '; ++wd; std::cout << (wd == std::chrono::Sunday) << '\n'; }
Output:
true true
See also
adds or subtracts a number of days (public member function) |
|
(C++20)
|
performs arithmetic on weekday s (function) |
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