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

      From cppreference.com
      <cpp‎ |chrono‎ |year
       
       
      Date and time library
       
       
      constexprstd::chrono::year& operator+=(conststd::chrono::years& y)noexcept;
      (1)(since C++20)
      constexprstd::chrono::year& operator-=(conststd::chrono::years& y)noexcept;
      (2)(since C++20)

      Adds or subtractsy.count() years from the year value.

      1) Equivalent to*this=*this+ y;.
      2) Equivalent to*this=*this- y;.

      Contents

      [edit]Return value

      A reference to thisyear after modification.

      [edit]Notes

      If the result would be outside the range[-3276732767], the actual stored value is unspecified.

      [edit]Example

      Run this code
      #include <chrono>#include <iostream> int main(){usingnamespace 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';}

      Output:

      true true

      [edit]See also

      increments or decrements the year
      (public member function)[edit]
      performs arithmetic onyears
      (function)[edit]
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/chrono/year/operator_arith&oldid=157522"

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