vowstar@gmail.com Huang Rui martinus/unordered_dense A fast and densely stored hashmap and hashset based on robin-hood backward shift deletion. The classes ankerl::unordered_dense::map and ankerl::unordered_dense::set are (almost) drop-in replacements of std::unordered_map and std::unordered_set. While they don't have as strong iterator / reference stability guaranties, they are typically much faster.