std::chrono::day::operator+=, std::chrono::day::operator-=

Since C++20

Adds or subtracts d.count() days from the day value.

# Declarations

constexpr std::chrono::day& operator+=( const std::chrono::days& d ) noexcept;

(since C++20)

constexpr std::chrono::day& operator-=( const std::chrono::days& d ) noexcept;

(since C++20)

# 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