====== C - C++ Operator Overloading - enum operator ======

<code cpp>
#include <string>
#include <iostream>
#include <ostream>
#include <cstdlib>
 
enum Week { Monday=0, Tuesday=1, Wednesday=2, Friday=4 };
 
// Explicitly cast to int, to avoid infinite recursion.
inline Week operator|(Week a, Week b) 
{
  return Week(int(a) | int(b));
}

inline Week& operator|=(Week& a, Week b) 
{
  a = a | b;
  return a;
}
 
inline Week operator&(Week a, Week b) 
{
  return Week(int(a) & int(b));
}

inline Week& operator&=(Week& a, Week b) 
{
  a = a & b;
  return a;
}
 
inline Week operator^(Week a, Week b) 
{
  return Week(int(a) ^ int(b));
}

inline Week& operator^=(Week& a, Week b) 
{
  a = a ^ b;
  return a;
}
 
inline Week operator~(Week a) 
{
  return Week(~int(a));
}
 
bool error()
{
  return std::rand()  2 != 0;
}
 
int main()
{
  Week a = Monday;
  std::cout << a << std::endl;
  a |= Tuesday;
  std::cout << a;
}
</code>