incremented define?

Question

Is there anyways to have a define increment every time you use it?

For example

int a = ADEFINE;
int b = ADEFINE;

a is 1 and b is 2.

Answer 1

If you don't need compile-time-constants, you could do something like this to enumerate classes:

int counter() {
    static int i = 0;
    return i++;
}

template
int id() { 
    static int i = counter();
    return i; 
};

class A {};
class B {};

int main()
{
    std::cout << id() << std::endl;
    std::cout << id() << std::endl;
}