std::chrono::weekday::operator++, std::chrono::weekday::operator--
|
(1) | (since C++20) |
|
(2) | (since C++20) |
|
(3) | (since C++20) |
|
(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 <cassert>
#include <chrono>
#include <iostream>
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';
wd = std::chrono::weekday{13};
assert(!wd.ok());
wd++;
assert(wd.ok());
}Output:
true trueSee also
| adds or subtracts a number of days (public member function) |
|
|
(C++20)
|
performs arithmetic on weekdays (function) |
© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/chrono/weekday/operator_inc_dec