C++ examples for Class:Operator Overload
The following code implements cast from Date class to long.
#include <iostream> #include <iomanip> using namespace std; // declaration section class Date/* w ww.ja va 2 s .com*/ { private: int month, day, year; public: Date(int = 7, int = 4, int = 2012); // constructor operator long(); // conversion operator prototype void showDate(); }; // implementation section Date::Date(int mm, int dd, int yyyy) // constructor { month = mm; day = dd; year = yyyy; } // conversion operator definition for converting a Date to a long int Date::operator long() // must return a long, as its name implies { long yyyymmdd; yyyymmdd = year * 10000 + month * 100 + day; return(yyyymmdd); } // member function to display a date void Date::showDate() { cout << setfill('0') << setw(2) << month << '/' << setw(2) << day << '/' << setw(2) << year % 100; return; } int main() { Date a(4,1,2012); // declare and initialize one object of type Date long b; // declare an object of type long b = long(a); // call the conversion function cout << "a's date is "; a.showDate(); cout << "\nThis date, as a long integer, is " << b << endl; return 0; }