Listing 2: table.h — The cross_reference_table header

// table.h
     
#include <stddef.h>
     
#include "deep.h"
     
class cross_reference_table
    {
public:
    cross_reference_table();
    void add(char const *w, unsigned n); 
    void put() const;
private:
    struct tree_node;
    static tree_node *add_tree
        (tree_node *t, char const *w, unsigned n);
    static void put_tree(tree_node const *t); 
    deep_pointer<tree_node> root;
    };
     
inline
cross_reference_table::cross_reference_table()
    {
    root = NULL;
    }
     
inline
void
cross_reference_table::add(char const *w, unsigned n)
    {
    root = add_tree(root, w, n);
    }
     
inline
void cross_reference_table::put() const
    {
    put_tree(root);
    }