/* -*- C++ -*-

 * lemon/traits.h - Part of LEMON, a generic C++ optimization library

 *

 * Copyright (C) 2005 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_TRAITS_H

#define LEMON_TRAITS_H

#include <lemon/utility.h>

///\file

///\brief Traits for graphs and maps

///

namespace lemon {

  template <typename _Graph, typename _Item>

  class ItemSetTraits {};

  template <typename _Graph>

  class ItemSetTraits<_Graph, typename _Graph::Node> {

  public:

    typedef _Graph Graph;

    typedef typename Graph::Node Item;

    typedef typename Graph::NodeIt ItemIt;

    template <typename _Value>

    class Map : public Graph::template NodeMap<_Value> {

    public:

      typedef typename Graph::template NodeMap<_Value> Parent; 

      typedef typename Parent::Value Value;

      Map(const Graph& _graph) : Parent(_graph) {}

      Map(const Graph& _graph, const Value& _value) 

	: Parent(_graph, _value) {}

    };

  };

  template <typename _Graph>

  class ItemSetTraits<_Graph, typename _Graph::Edge> {

  public:

    typedef _Graph Graph;

    typedef typename Graph::Edge Item;

    typedef typename Graph::EdgeIt ItemIt;

    template <typename _Value>

    class Map : public Graph::template EdgeMap<_Value> {

    public:

      typedef typename Graph::template EdgeMap<_Value> Parent; 

      typedef typename Parent::Value Value;

      Map(const Graph& _graph) : Parent(_graph) {}

      Map(const Graph& _graph, const Value& _value) 

	: Parent(_graph, _value) {}

    };

  };

  template <typename _Graph>

  class ItemSetTraits<_Graph, typename _Graph::UndirEdge> {

  public:

    typedef _Graph Graph;

    typedef typename Graph::UndirEdge Item;

    typedef typename Graph::UndirEdgeIt ItemIt;

    template <typename _Value>

    class Map : public Graph::template UndirEdgeMap<_Value> {

    public:

      typedef typename Graph::template UndirEdgeMap<_Value> Parent; 

      typedef typename Parent::Value Value;

      Map(const Graph& _graph) : Parent(_graph) {}

      Map(const Graph& _graph, const Value& _value) 

	: Parent(_graph, _value) {}

    };

  };

  template <typename Map, typename Enable = void>

  struct MapTraits {

    typedef False ReferenceMapTag;

    typedef typename Map::Key Key;

    typedef typename Map::Value Value;

    typedef Value ConstReturnValue;

    typedef Value& ReturnValue;

  };

  template <typename Map>

  struct MapTraits<

    Map, typename enable_if<typename Map::ReferenceMapTag, void>::type > 

  {

    typedef True ReferenceMapTag;

    typedef typename Map::Key Key;

    typedef typename Map::Value Value;

    typedef typename Map::ConstReference ConstReturnValue;

    typedef typename Map::Reference ReturnValue;

    typedef typename Map::ConstReference ConstReference; 

    typedef typename Map::Reference Reference;

 };

  // Indicators for the tags

  template <typename Graph, typename Enable = void>

  struct NodeNumTagIndicator {

    static const bool value = false;

  };

  template <typename Graph>

  struct NodeNumTagIndicator<

    Graph, 

    typename enable_if<typename Graph::NodeNumTag, void>::type

  > {

    static const bool value = true;

  };

  template <typename Graph, typename Enable = void>

  struct EdgeNumTagIndicator {

    static const bool value = false;

  };

  template <typename Graph>

  struct EdgeNumTagIndicator<

    Graph, 

    typename enable_if<typename Graph::EdgeNumTag, void>::type

  > {

    static const bool value = true;

  };

  template <typename Graph, typename Enable = void>

  struct FindEdgeTagIndicator {

    static const bool value = false;

  };

  template <typename Graph>

  struct FindEdgeTagIndicator<

    Graph, 

    typename enable_if<typename Graph::FindEdgeTag, void>::type

  > {

    static const bool value = true;

  };

}

#endif // LEMON_MAPS_H