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

Since C++20

Adds or subtracts y.count() years from the year value.

# Declarations

constexpr std::chrono::year& operator+=( const std::chrono::years& y ) noexcept;

(since C++20)

constexpr std::chrono::year& operator-=( const std::chrono::years& y ) noexcept;

(since C++20)

# Return value

A reference to this year after modification.

# Notes

If the result would be outside the range [-32767,32767], the actual stored value is unspecified.

# Example

#include <chrono>
#include <iostream>
 
int main()
{
    using namespace std::literals::chrono_literals;
    std::cout << std::boolalpha;
 
    std::chrono::year y{2020};
 
    y += std::chrono::years(12);
    std::cout << (y == 2032y) << ' ';
 
    y -= std::chrono::years(33);
    std::cout << (y == 1999y) << '\n';
}

# See also