/* -*- 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