/* -*- mode: C++; indent-tabs-mode: nil; -*-

 *

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

 *

 * Copyright (C) 2003-2008

 * 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_TRAITS_H

#define LEMON_BITS_TRAITS_H

///\file

///\brief Traits for graphs and maps

///

#include <lemon/bits/enable_if.h>

namespace lemon {

  struct InvalidType {};

  template <typename _Graph, typename _Item>

  class ItemSetTraits {};

  template <typename Graph, typename Enable = void>

  struct NodeNotifierIndicator {

    typedef InvalidType Type;

  };

  template <typename Graph>

  struct NodeNotifierIndicator<

    Graph,

    typename enable_if<typename Graph::NodeNotifier::Notifier, void>::type

  > {

    typedef typename Graph::NodeNotifier Type;

  };

  template <typename _Graph>

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

  public:

    typedef _Graph Graph;

    typedef typename Graph::Node Item;

    typedef typename Graph::NodeIt ItemIt;

    typedef typename NodeNotifierIndicator<Graph>::Type ItemNotifier;

    template <typename _Value>

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

    public:

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

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

      typedef typename Parent::Value Value;

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

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

        : Parent(_digraph, _value) {}

     };

  };

  template <typename Graph, typename Enable = void>

  struct ArcNotifierIndicator {

    typedef InvalidType Type;

  };

  template <typename Graph>

  struct ArcNotifierIndicator<

    Graph,

    typename enable_if<typename Graph::ArcNotifier::Notifier, void>::type

  > {

    typedef typename Graph::ArcNotifier Type;

  };

  template <typename _Graph>

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

  public:

    typedef _Graph Graph;

    typedef typename Graph::Arc Item;

    typedef typename Graph::ArcIt ItemIt;

    typedef typename ArcNotifierIndicator<Graph>::Type ItemNotifier;

    template <typename _Value>

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

    public:

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

      typedef typename Graph::template ArcMap<_Value> Type;

      typedef typename Parent::Value Value;

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

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

        : Parent(_digraph, _value) {}

    };

  };

  template <typename Graph, typename Enable = void>

  struct EdgeNotifierIndicator {

    typedef InvalidType Type;

  };

  template <typename Graph>

  struct EdgeNotifierIndicator<

    Graph,

    typename enable_if<typename Graph::EdgeNotifier::Notifier, void>::type

  > {

    typedef typename Graph::EdgeNotifier Type;

  };

  template <typename _Graph>

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

  public:

    typedef _Graph Graph;

    typedef typename Graph::Edge Item;

    typedef typename Graph::EdgeIt ItemIt;

    typedef typename EdgeNotifierIndicator<Graph>::Type ItemNotifier;

    template <typename _Value>

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

    public:

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

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

      typedef typename Parent::Value Value;

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

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

        : Parent(_digraph, _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;

 };

  template <typename MatrixMap, typename Enable = void>

  struct MatrixMapTraits {

    typedef False ReferenceMapTag;

    typedef typename MatrixMap::FirstKey FirstKey;

    typedef typename MatrixMap::SecondKey SecondKey;

    typedef typename MatrixMap::Value Value;

    typedef Value ConstReturnValue;

    typedef Value ReturnValue;

  };

  template <typename MatrixMap>

  struct MatrixMapTraits<

    MatrixMap, typename enable_if<typename MatrixMap::ReferenceMapTag,

                                  void>::type >

  {

    typedef True ReferenceMapTag;

    typedef typename MatrixMap::FirstKey FirstKey;

    typedef typename MatrixMap::SecondKey SecondKey;

    typedef typename MatrixMap::Value Value;

    typedef typename MatrixMap::ConstReference ConstReturnValue;

    typedef typename MatrixMap::Reference ReturnValue;

    typedef typename MatrixMap::ConstReference ConstReference;

    typedef typename MatrixMap::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;

  };

  template <typename Graph, typename Enable = void>

  struct UndirectedTagIndicator {

    static const bool value = false;

  };

  template <typename Graph>

  struct UndirectedTagIndicator<

    Graph,

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

  > {

    static const bool value = true;

  };

  template <typename Graph, typename Enable = void>

  struct BuildTagIndicator {

    static const bool value = false;

  };

  template <typename Graph>

  struct BuildTagIndicator<

    Graph,

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

  > {

    static const bool value = true;

  };

}

#endif