/* -*- 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_LIST_GRAPH_H

 #define LEMON_LIST_GRAPH_H

 ///\ingroup graphs

 ///\file

 ///\brief Virtual map support.

 namespace lemon {

   ///Base class of the virtual maps.

   template<class K, class V>

   class VMapBase 

   {

   public:

     ///\e

     typedef K Key;

     ///\e

     typedef V Value;

     ///\e

     virtual Value operator[](const Key &) const { return Value();}

     ///\e

     virtual void set(const Key &,const Value &) {}

   };

   ///Base class of the virtual reference maps.

   template<class K, class V>

   class VRefMapBase 

   {

   public:

     ///\e

     typedef K Key;

     ///\e

     typedef V Value;

     ///\e

     virtual Value& operator[](Key &) = 0;

     ///\e

     virtual Value& operator[](const Key &) const = 0;

     ///\e

     virtual void set(const Key &,const Value &) = 0;

   };

   ///Makes a virtual map from a \ref concepts::ReadMap "ReadMap"

   template<class M, class K=typename M::Key,class V=typename M::Value>

   class VReadMap : public VMapBase<K,V> 

   {

     const M ↦

   public:

   ///\e

     VReadMap(const M &m) : map(m) {}

     virtual Value operator[](const Key &k) const { return map[k];}

   };

   ///Function interface for \ref VReadMap.

   template<class M, class K=typename M::Key,class V=typename M::Value>

   vReadMap(const M& m) {return VReadMap<M,K,V>(m);}

   ///Makes a virtual map from a \ref concepts::WriteMap "WriteMap"

   template<class M, class K=typename M::Key,class V=typename M::Value>

   class VWriteMap :public VMapBase<K,V> 

   {

     M ↦

   public:

     ///\e

     VWriteMap(M &m) : map(m) {}

     virtual void set(const Key &k,const Value &v) { map.set(k,v);}

   };

   ///Function interface for \ref VWriteMap.

   template<class M, class K=typename M::Key,class V=typename M::Value>

   vWriteMap(const M& m) {return VReadMap<M,K,V>(m);}

   ///Makes a virtual map from a \ref concepts::ReadWriteMap "ReadWriteMap"

   template<class M, class K=typename M::Key,class V=typename M::Value>

   class VReadWriteMap :public VMapBase<K,V>

   {

     M ↦

   public:

     ///\e

     VReadWriteMap(M &m) : map(m) {}

     virtual Value operator[](const Key &k) const { return map[k];}

     virtual void set(const Key &k,const Value &v) { map.set(k,v);}

   };

   ///Function interface for \ref VReadWriteMap.

   template<class M, class K=typename M::Key,class V=typename M::Value>

   vReadWriteMap(const M& m) {return VReadMap<M,K,V>(m);}

   /// @}  

 } //namespace lemon

 #endif