Function operator+

inst/include/Rcpp/date_datetime/Date.h:156–162

    }

    inline Date operator+(const Date &date, int offset) {
        Date newdate(date.m_d);
        newdate.m_d += offset;
        time_t t = static_cast<time_t>(24*60*60 * newdate.m_d);  // days since epoch to seconds since epo
        newdate.m_tm = *gmtime_(&t);
        return newdate;
    }

    inline double operator-( const Date& d1, const Date& d2) { return d1.m_d -  d2.m_d; }
    inline bool   operator<( const Date &d1, const Date& d2) { return d1.m_d <  d2.m_d; }