Enum_operator_overload_1.cpp

// author: jaydattpatel
//Supplementary example on overloading operator
#include<iostream>
#include<cstdint>
using namespace std;

//enum class days:std::int8_t{SUNDAY,MONDAY,TUESDAY,WEDNESDAY,THURSDAY,FRIDAY,SATURDAY};
enum class days{SUNDAY,MONDAY,TUESDAY,WEDNESDAY,THURSDAY,FRIDAY,SATURDAY};
 //unlike plain enums C++11 enum class is typesafe and does not silently convert to int

ostream& operator<<(ostream& out, const days& d)
{ 
    out << static_cast<int>(d); 
    return out; 
}
days operator++(days& d) //PREFIX OPERATOR
{ 
    d = static_cast<days>((static_cast<int>(d) + 1) % 7); 
    return d; 
}
days operator++(days& d, int) //POSTFIX OPERATOR
{
    days temp = d;
    d = static_cast<days>((static_cast<int>(d) + 1) % 7);
    return temp;
}
int main()
{
    days today{days::SUNDAY};// today = days::SUNDAY
    cout << "Demonstrate class enum" << endl;
    cout << "SUNDAY : " << today << endl;
    cout << "MONDAY : " << ++today << endl;
    today++;
    cout << "TUESDAY : " << today << endl;
    cout << "WEDNESDAY : " << ++today << endl;
    today++;
    cout << "THURSDAY : " << today << endl;
    cout << "FRIDAY : " << ++today << endl;
    today++;
    cout << "SATURDAY : " << today << endl;
    cout << "SUNDAY : " << ++today << endl;
    return 0;
}