doc_list_algorithms.cpp

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/////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga  2006-2007
//
// Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file LICENSE_1_0.txt or copy at
//          http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/intrusive for documentation.
//
/////////////////////////////////////////////////////////////////////////////
//[doc_list_algorithms_code
#include <boost/intrusive/circular_list_algorithms.hpp>
#include <cassert>

struct my_node
{
   my_node *next_, *prev_;
   //other members...
};

//Define our own list_node_traits
struct my_list_node_traits
{
   typedef my_node                                    node;
   typedef my_node *                                  node_ptr;
   typedef const my_node *                            const_node_ptr;
   static node_ptr get_next(const_node_ptr n)         {  return n->next_;  }  
   static void set_next(node_ptr n, node_ptr next)    {  n->next_ = next;  }  
   static node *get_previous(const_node_ptr n)        {  return n->prev_;  }  
   static void set_previous(node_ptr n, node_ptr prev){  n->prev_ = prev;  }  
};

int main()
{
   typedef boost::intrusive::circular_list_algorithms<my_list_node_traits> algo;
   my_node one, two, three;

   //Create an empty doubly linked list container:
   //"one" will be the first node of the container
   algo::init_header(&one);
   assert(algo::count(&one) == 1);

   //Now add a new node before "one"
   algo::link_before(&one, &two);
   assert(algo::count(&one) == 2);

   //Now add a new node after "two"
   algo::link_after(&two, &three);
   assert(algo::count(&one) == 3);

   //Now unlink the node after one
   algo::unlink(&three);
   assert(algo::count(&one) == 2);

   //Now unlink two
   algo::unlink(&two);
   assert(algo::count(&one) == 1);

   //Now unlink one
   algo::unlink(&one);
   assert(algo::count(&one) == 1);

   return 0;
}
//]