C++ foreach

I can never remember the C++ for-each loop syntax. Thus, a helper macro I use:

#define for_each(type, it, L) for (type::iterator (it) = (L).begin(); (it) != (L).end(); ++(it))

If L has type T, usage is:

for_each(T, it, L) {
  printf("%d\n", (*it));
}

If you're only using gcc, one can use __typeof__ [1] to simplify this.