std::chrono::month::operator++, std::chrono::month::operator--
From cppreference.com
|
constexpr
std::chrono::month
& operator++
(
)
noexcept
;
|
(1) | (since C++20) |
|
constexpr
std::chrono::month operator++
(
int
)
noexcept
;
|
(2) | (since C++20) |
|
constexpr
std::chrono::month
& operator--
(
)
noexcept
;
|
(3) | (since C++20) |
|
constexpr
std::chrono::month operator--
(
int
)
noexcept
;
|
(4) | (since C++20) |
Adds or subtracts 1 from the month value, reducing the result modulo 12 to an integer in the range
[
1
,
12
]
1,2) Performs
*this +
=
std::chrono::months
{
1
}
;
3,4) Performs
*this -
=
std::chrono::months
{
1
}
;
Parameters
(none)
Return value
1,3) A reference to this
month after modification.2,4) A copy of the
month 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::chrono::month m{6}; ++m; assert(m == std::chrono::month(7)); --m; assert(m == std::chrono::month(6)); m = std::chrono::December; m++; // rounds up to January assert(m.ok()); std::cout << unsigned(m) << '\n'; m = std::chrono::January; m--; // rounds down to December assert(m.ok()); std::cout << unsigned(m) << '\n'; }
Output:
1 12
See also
| adds or subtracts a number of months (public member function) |
|
|
(C++20)
|
performs arithmetic on months (function) |