Reverse List X34491

Consider the following struct for a doubly linked list.

    struct list_node
    {
        int m_value;
        list_node* m_previous = nullptr;
        list_node* m_next = nullptr;
    };

Implement the function

    list_node* reverse(list_node* head);

that reverses in-place the given list, without dynamic memory allocations, and returns a pointer to its new head.

Observation

You only need to submit the required classes; your main program will be ignored.

Strictly obey the type definitions of the statement.