Node handles
Containers » Associative
Collaboration diagram for Node handles:

Since
  C++17

The associative containers (`map`, `set`, `multimap` and `multiset`) support extracting and re-inserting nodes from the container. Those operations use the container's `node_handle` type, which is an alias for a `_Node_handle<...>` type. You should always use the container's `node_handle` type (e.g. `std::set<int>node_handle`) to refer to these types, not the non-standard internal `_Node_handle` names.