std::chrono::weekday::operator++, std::chrono::weekday::operator--
From cppreference.com
|
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
Run this code
#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 true
See also
| adds or subtracts a number of days (public member function) |
|
|
(C++20)
|
performs arithmetic on weekdays (function) |