/* -*- C++ -*-

  *

  * This file is a part of LEMON, a generic C++ optimization library

  *

  * Copyright (C) 2003-2006

  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

  * (Egervary Research Group on Combinatorial Optimization, EGRES).

  *

  * Permission to use, modify and distribute this software is granted

  * provided that this copyright notice appears in all copies. For

  * precise terms see the accompanying LICENSE file.

  *

  * This software is provided "AS IS" with no warranty of any kind,

  * express or implied, and with no claim as to its suitability for any

  * purpose.

  *

  */

 #ifndef LEMON_BITS_MAP_EXTENDER_H

 #define LEMON_BITS_MAP_EXTENDER_H

 #include <iterator>

 #include <lemon/bits/traits.h>

 ///\file

 ///\brief Extenders for iterable maps.

 namespace lemon {

   /// \ingroup graphbits

   /// 

   /// \brief Extender for maps

   template <typename _Map>

   class MapExtender : public _Map {

   public:

     typedef _Map Parent;

     typedef MapExtender Map;

     typedef typename Parent::Graph Graph;

     typedef typename Parent::Key Item;

     typedef typename Parent::Key Key;

     typedef typename Parent::Value Value;

     class MapIt;

     class ConstMapIt;

     friend class MapIt;

     friend class ConstMapIt;

   public:

     MapExtender(const Graph& graph) 

       : Parent(graph) {}

     MapExtender(const Graph& graph, const Value& value) 

       : Parent(graph, value) {}

     class MapIt : public Item {

     public:

       typedef Item Parent;

       typedef typename Map::Value Value;

       MapIt() {}

       MapIt(Invalid i) : Parent(i) { }

       explicit MapIt(Map& _map) : map(_map) {

         map.getNotifier()->first(*this);

       }

       MapIt(const Map& _map, const Item& item) 

 	: Parent(item), map(_map) {}

       MapIt& operator++() { 

 	map.getNotifier()->next(*this);

 	return *this; 

       }

       typename MapTraits<Map>::ConstReturnValue operator*() const {

 	return map[*this];

       }

       typename MapTraits<Map>::ReturnValue operator*() {

 	return map[*this];

       }

       void set(const Value& value) {

 	map.set(*this, value);

       }

     protected:

       Map& map;

     };

     class ConstMapIt : public Item {

     public:

       typedef Item Parent;

       typedef typename Map::Value Value;

       ConstMapIt() {}

       ConstMapIt(Invalid i) : Parent(i) { }

       explicit ConstMapIt(Map& _map) : map(_map) {

         map.getNotifier()->first(*this);

       }

       ConstMapIt(const Map& _map, const Item& item) 

 	: Parent(item), map(_map) {}

       ConstMapIt& operator++() { 

 	map.getNotifier()->next(*this);

 	return *this; 

       }

       typename MapTraits<Map>::ConstReturnValue operator*() const {

 	return map[*this];

       }

     protected:

       const Map& map;

     };

     class ItemIt : Item {

     public:

       typedef Item Parent;

       ItemIt() {}

       ItemIt(Invalid i) : Parent(i) { }

       explicit ItemIt(Map& _map) : map(_map) {

         map->getNotifier()->first(*this);

       }

       ItemIt(const Map& _map, const Item& item) 

 	: Parent(item), map(_map) {}

       ItemIt& operator++() { 

 	map.getNotifier()->next(*this);

 	return *this; 

       }

     protected:

       const Map& map;

     };

   };

 }

 #endif