How do I get a const_iterator using auto?

Question

First question: is it possible to \"force\" a const_iterator using auto? For example:

map usa         


        

Answer 1

A clean solution is to work with a const reference to the otherwise modifiable map:

const auto &const_usa = usa;
auto city_it = const_usa.find("New York");

This will make sure you can't modify const_usa, and will use const iterators.