template<class T> class ListNode { public: void setSibling(T sibling) { _list_node_sibling = sibling; } const T getSi

This is a C++ template class definition for a ListNode, which is a basic building block for linked lists. The class has one template parameter, T, which represents the type of data that will be stored in the list node. The class has two public methods: setSibling and getSibling. The setSibling method takes a parameter of type T and sets the _list_node_sibling member variable to that value. The getSibling method returns the value