Should I prefer iterators over const_iterators?

Question

Someone here recently brought up the article from Scott Meyers that says:

• Prefer iterators over const_iterators (pdf link).

Answer 1

I don't think this particular statement of Meyer's needs to be taken with special concern. When you want a non-modifying operation, it is best to use a const_iterator. Otherwise, use an ordinary iterator. However, do note the one important thing: Never mix iterators i.e. const ones with non-const ones. As long as you are aware of the latter, you should be fine.