class TArbre
{
  /*...*/
 public
 /*...*/
 void Reindex (TNode **, vector<int> &);
 /*...*/
}

void TArbre::Reindex (TNode **w, vector<int> &index)
{
   index.clear();
   iGauche_detour (w);
   for(int j= 0 ;j<index.size();j++)
   {
      for(int i= 0 ;i<index.size()-j;i++)
      {
          if (index.at(i)>index.at(i+ 1 ))
          {
             int buf=index.at(i);
             index.at(i)=index.at(i+ 1 );
             index.at(i+ 1 )=buf;
          }
      }
   }
   for (int i= 0 ;i<index.size();i++)
   {
       index.at(i)=i;
   }
   icGauche_detour (w, index);
}

A.Reindex (A.Rendre_la_racine(), A.index);