Remove duplicates from a list

Question

Using STL algorithms (as much as possible) such as remove_if() and list::erase, is there a nice way to remove duplicates from a list defined as fol

Answer 1

Using the list::remove_if member function, a temporary hashed set, and lambda expression.

std::list l;
std::unordered_set s;

l.remove_if([&](int n) {
    return (s.find(n) == s.end()) ? (s.insert(n), false) : true;
});