Method insert

test-app/runtime/src/main/cpp/robin_hood.h:1782–1787

        template <typename Iter>
        void insert(Iter first, Iter last) {
            for (; first != last; ++first) {
                // value_type ctor needed because this might be called with std::pair's
                insert(value_type(*first));
            }
        }

        void insert(std::initializer_list<value_type> ilist) {
            for (auto&& vt : ilist) {