//
// This is example code from Chapter 10.8 "User-defined output operators" of
// "Programming -- Principles and Practice Using C++" by Bjarne Stroustrup
//

#include "../std_lib_facilities.h"

//------------------------------------------------------------------------------

class Date {
public:
    enum Month {
        jan=1, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec
    };

    Date() {}                                               // default constructor
    Date(int yy, Month mm, int dd) : y(yy), m(mm), d(dd) {} // constructor
    Month month() const { return m; }
    int   day()   const { return d; }
    int   year()  const { return y; }

private:
    int y;
    Month m;
    int d;
};

//------------------------------------------------------------------------------

ostream& operator<<(ostream& os, const Date& d)
{
    return os << '(' << d.year()
              << ',' << d.month()
              << ',' << d.day() 
              << ')';
}

//------------------------------------------------------------------------------

int main()
{
    Date d1(1994,Date::mar,29);
    Date d2(2000,Date::feb,15);

    cout << d1;       // same as operator<<(cout,d1);
    operator<<(cout,d1);
    cout << d1 << d2; // means operator<<(cout,d1) << d2;
    // means operator<<(operator<<(cout,d1),d2);
    operator<<(operator<<(cout,d1),d2);
}

//------------------------------------------------------------------------------