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#include <iostream>
 
using namespace std;
 
enum Month {
   january = 1,
   february,
   march,
   april,
   may,
   june,
   july,
   august,
   september,
   october,
   november,
   december
};
 
class Date {
    int y, d;
    Month m;
 
    public:
        Date(int yy, Month mm, int dd) // constructor
        : y(yy), d(dd), m(mm) { // member initializer
        }
 
        Month& operator++(Month &m) {
            m = static_cast<Month>(m + 1);
            return m;
        }
 
        void add_month() {
            ++m;
        }
};
 
int main()
{
   Month m = january;
   ++m;
}

prog.cpp:29:35: error: postfix ‘Month& Date::operator++(Month&)’ must take ‘int’ as its argument
         Month& operator++(Month &m) {
                                   ^
prog.cpp: In member function ‘void Date::add_month()’:
prog.cpp:35:13: error: no match for ‘operator++’ (operand type is ‘Month’)
             ++m;
             ^~~
prog.cpp: In function ‘int main()’:
prog.cpp:42:4: error: no match for ‘operator++’ (operand type is ‘Month’)
    ++m;
    ^~~

Standard output is empty