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, num1, .. num6 are between 0 and 31, then you can use

int match = ((1<

If num1 to num6 are constants, the compiler will compute match at compile time.