C++ Theory and Practice

Listing 3: The cross-reference table non-inline member function definitions, still using character pointers instead of strings

// table.cpp

#include <stdio.h>
#include <string.h>

#include "deep.h"
#include "table.h"
#include "sequence.h"

struct cross_reference_table::tree_node
    {
    tree_node(unsigned n);
    deep_pointer<char> word;
    line_number_sequence lines;
    deep_pointer<tree_node> left, right;
    };

inline
cross_reference_table::
tree_node::tree_node(unsigned n)
    : lines(n)
    {
    }

cross_reference_table::tree_node *
cross_reference_table::add_tree
(tree_node *t, char const *w, unsigned n)
    {
    int cmp;
    if (t == NULL)
        {
        t = new tree_node (n);
        t->word = new char [strlen(w) + 1];
        strcpy(t->word, w);
        t->left = t->right = NULL;

        }
    else if ((cmp = strcmp(w, t->word)) < 0)
        t->left = add_tree(t->left, w, n);
    else if (cmp > 0)
        t->right = add_tree(t->right, w, n);
    else
        t->lines.add(n);
    return t;
    }

void
cross_reference_table::put_tree(tree_node const *t)
    {
    if (t != NULL)
        {
        put_tree(t->left);
        printf("%12s:", t->word);
        t->lines.put();
        printf("\n");
        put_tree(t->right);
        }
    }