Comparison tricks in C++

Question

A class:

class foo{
public:
    int data;
};

Now I want to add a method to this class, to do some comparison, to see if its data is equal to on

Answer 1

If data is really an integral or enumerated type, you can use a switch:

switch (data) {
  case 1:
  case 2:
  case 2000:
  case 6000:
  case /* whatever other values you want */:
    act_on_the_group();
    break;
  default:
    act_on_not_the_group();
    break;
}