What's the noun to describe the behavior <Some class>?

[lampahome]

I saw one line code, but I don't know how to describe the behavior.

void visit_values(btree_path const &path, node_ref<ValueTraits> const &n) {
                                btree_path p2(path);
                                unsigned nr = n.get_nr_entries();
                                for (unsigned i = 0; i < nr; i++) {
                                        ...
                                }
                        }

I'm confused about node_ref<ValueTraits> const &n.
node_ref is the class defined type of n. But what does <ValueTraits> mean?

[MikeyBoy]

n is the name of the second argument to the function.

node_ref<ValueTraits> const is the type of the argument.

node_ref<ValueTraits> means that node_ref is a class template, and the object being passed is templated on ValueTraits.

const & means it's being passed as a const reference.