std::chrono::day::operator+=, std::chrono::day::operator-=
constexpr std::chrono::day& operator+=( const std::chrono::days& d ) noexcept; | (1) | (since C++20) |
constexpr std::chrono::day& operator-=( const std::chrono::days& d ) noexcept; | (2) | (since C++20) |
Adds or subtracts d.count() days from the day value.
1) Equivalent to
*this = *this + d;.
2) Equivalent to
*this = *this - d;.Return value
A reference to this day after 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 += std::chrono::days(2);
assert(d == std::chrono::day(17));
d -= std::chrono::days{3};
assert(d == std::chrono::day(14));
}
See also
| increments or decrements the day (public member function) |
|
|
(C++20) | adds or subtracts a number of days and a day, or find the difference between two days (function) |
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