Listing 4: xr using the cross_reference_table class

// xr.cpp - generate a cross-reference of words

#include <ctype.h>
#include <stdio.h>

#include "table.h"

int get_token(char *s, size_t n);

#define MAX_TOKEN 256

int main()
    {
    cross_reference_table table;
    char token[MAX_TOKEN];
    unsigned ln = 1;
    while (get_token(token, MAX_TOKEN))
        if (isalpha(token[0]) || token[0] == '_')
            table.add(token, ln);
        else // if (token[0] == '\n')
            ++ln;
    table.put();
    return 0;
    }

int get_token(char *s, size_t n)
    {
    ... same as in Listing 1 ...
    }
//End of File