Перегрузка постфиксной и префиксной формы оператора ++

CMyTime const operator ++(CMyTime& time);

#include <iostream>
 
struct Foo
{
    int mBar;
};
 
Foo& operator ++ (Foo& value)
{
    value.mBar++;
    return value;
}
 
Foo operator ++ (Foo& value, int)
{
    Foo result(value);
    value.mBar++;
    return result;
}
 
int main()
{
    Foo f;
    ++f;
    f++;
}

CMyTime const CMyTime::operator++(CMyTime& time)
{
     time.seconds++;
     return time;   
}

CMyTime & operator ++() {
   time.seconds++;
   return *this:
}

class CMyTime
{
public:
    //CMyTime();
    CMyTime(unsigned hours, unsigned minutes, unsigned seconds = 0); 
    CMyTime(unsigned timeStamp = 0);
 // инициализирует время количеством секунд после полуночи 
    ~CMyTime(void);
 
    CMyTime const operator +(CMyTime const& time) const;
    CMyTime const operator -(CMyTime const& time) const;
    CMyTime const operator ++(CMyTime& time);
    CMyTime const operator -(CMyTime const& vector) const;
    CMyTime& operator +=(CMyTime const& vector);
    CMyTime& operator -=(CMyTime const& vector);
    CMyTime const operator *(double scalar) const;
    CMyTime const operator /(double scalar) const;
    CMyTime& operator *=(double scalar);
    CMyTime& operator /=(double scalar);
    bool operator == (CMyTime const& vector) const;
    bool operator != (CMyTime const& vector) const;
    
unsigned int GetSecondsAfterMidnight();
 
 
    unsigned int secondAfterMidnight;
};