Listing 3 xrt member function definitions

//
// xrt.cpp - cross-reference table
//

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

#include "xrt.h"

class treenode
   {
public:
   treenode(const char *w, unsigned n);
   ~treenode();
   char *word;
   lns lines;
   xrt left, right;
   };

treenode::treenode(const char *w,
                unsigned n) : lines(n)
   {
   word = strcpy(new char[strlen(w)
                 + 1], w);
   }

treenode::~treenode()
   {
   delete [] word;
   }

xrt::~xrt()
   {
   delete root;
   }

void xrt::add(const char *w, unsigned n)
   {
   int cond;
   
   if (root == 0)
      root = new treenode(w, n);
   else if ((cond = strcmp(w,
           root->word)) == 0)
      root->lines.add(n);
   else if (cond < 0)
      root->left.add(w, n);
   else
      root->right.add(w, n);
   }

void xrt::print()
   {
   if (root != 0)
      {
      root->left.print();
      printf("%12s:", root->word);
      root->lines.print();
      printf("\n");
      root->right.print();
      }
   }

// End of File