lemon/bits/map_extender.h
author Alpar Juttner <alpar@cs.elte.hu>
Thu, 23 Apr 2009 10:44:35 +0100
changeset 612 0c8e5c688440
parent 440 88ed40ad0d4f
child 617 4137ef9aacc6
permissions -rw-r--r--
Fix usage of sqrt() (#268)
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/* -*- mode: C++; indent-tabs-mode: nil; -*-
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 *
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 * This file is a part of LEMON, a generic C++ optimization library.
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 *
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 * Copyright (C) 2003-2009
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 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
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 * (Egervary Research Group on Combinatorial Optimization, EGRES).
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 *
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 * Permission to use, modify and distribute this software is granted
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 * provided that this copyright notice appears in all copies. For
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 * precise terms see the accompanying LICENSE file.
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 *
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 * This software is provided "AS IS" with no warranty of any kind,
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 * express or implied, and with no claim as to its suitability for any
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 * purpose.
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 *
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 */
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#ifndef LEMON_BITS_MAP_EXTENDER_H
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#define LEMON_BITS_MAP_EXTENDER_H
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#include <iterator>
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#include <lemon/bits/traits.h>
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#include <lemon/concept_check.h>
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#include <lemon/concepts/maps.h>
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//\file
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//\brief Extenders for iterable maps.
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namespace lemon {
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  // \ingroup graphbits
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  //
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  // \brief Extender for maps
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  template <typename _Map>
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  class MapExtender : public _Map {
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  public:
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    typedef _Map Parent;
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    typedef MapExtender Map;
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    typedef typename Parent::Graph Graph;
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    typedef typename Parent::Key Item;
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    typedef typename Parent::Key Key;
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    typedef typename Parent::Value Value;
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    typedef typename Parent::Reference Reference;
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    typedef typename Parent::ConstReference ConstReference;
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    class MapIt;
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    class ConstMapIt;
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    friend class MapIt;
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    friend class ConstMapIt;
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  public:
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    MapExtender(const Graph& graph)
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      : Parent(graph) {}
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    MapExtender(const Graph& graph, const Value& value)
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      : Parent(graph, value) {}
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  private:
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    MapExtender& operator=(const MapExtender& cmap) {
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      return operator=<MapExtender>(cmap);
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    }
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    template <typename CMap>
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    MapExtender& operator=(const CMap& cmap) {
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      Parent::operator=(cmap);
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      return *this;
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    }
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  public:
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    class MapIt : public Item {
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    public:
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      typedef Item Parent;
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      typedef typename Map::Value Value;
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      MapIt() {}
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      MapIt(Invalid i) : Parent(i) { }
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      explicit MapIt(Map& _map) : map(_map) {
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        map.notifier()->first(*this);
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      }
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      MapIt(const Map& _map, const Item& item)
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        : Parent(item), map(_map) {}
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      MapIt& operator++() {
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        map.notifier()->next(*this);
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        return *this;
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      }
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      typename MapTraits<Map>::ConstReturnValue operator*() const {
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        return map[*this];
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      }
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      typename MapTraits<Map>::ReturnValue operator*() {
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        return map[*this];
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      }
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      void set(const Value& value) {
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        map.set(*this, value);
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      }
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    protected:
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      Map& map;
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    };
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    class ConstMapIt : public Item {
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    public:
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      typedef Item Parent;
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      typedef typename Map::Value Value;
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      ConstMapIt() {}
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      ConstMapIt(Invalid i) : Parent(i) { }
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      explicit ConstMapIt(Map& _map) : map(_map) {
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        map.notifier()->first(*this);
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      }
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      ConstMapIt(const Map& _map, const Item& item)
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        : Parent(item), map(_map) {}
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      ConstMapIt& operator++() {
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        map.notifier()->next(*this);
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        return *this;
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      }
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      typename MapTraits<Map>::ConstReturnValue operator*() const {
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        return map[*this];
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      }
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    protected:
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      const Map& map;
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    };
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    class ItemIt : public Item {
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    public:
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      typedef Item Parent;
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      ItemIt() {}
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      ItemIt(Invalid i) : Parent(i) { }
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      explicit ItemIt(Map& _map) : map(_map) {
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        map.notifier()->first(*this);
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      }
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      ItemIt(const Map& _map, const Item& item)
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        : Parent(item), map(_map) {}
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      ItemIt& operator++() {
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        map.notifier()->next(*this);
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        return *this;
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      }
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    protected:
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      const Map& map;
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    };
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  };
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  // \ingroup graphbits
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  //
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  // \brief Extender for maps which use a subset of the items.
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  template <typename _Graph, typename _Map>
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  class SubMapExtender : public _Map {
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  public:
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    typedef _Map Parent;
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    typedef SubMapExtender Map;
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    typedef _Graph Graph;
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    typedef typename Parent::Key Item;
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    typedef typename Parent::Key Key;
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    typedef typename Parent::Value Value;
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    typedef typename Parent::Reference Reference;
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    typedef typename Parent::ConstReference ConstReference;
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    class MapIt;
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    class ConstMapIt;
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    friend class MapIt;
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    friend class ConstMapIt;
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  public:
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    SubMapExtender(const Graph& _graph)
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      : Parent(_graph), graph(_graph) {}
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    SubMapExtender(const Graph& _graph, const Value& _value)
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      : Parent(_graph, _value), graph(_graph) {}
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  private:
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    SubMapExtender& operator=(const SubMapExtender& cmap) {
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      return operator=<MapExtender>(cmap);
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    }
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    template <typename CMap>
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    SubMapExtender& operator=(const CMap& cmap) {
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      checkConcept<concepts::ReadMap<Key, Value>, CMap>();
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      Item it;
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      for (graph.first(it); it != INVALID; graph.next(it)) {
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        Parent::set(it, cmap[it]);
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      }
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      return *this;
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    }
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  public:
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    class MapIt : public Item {
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    public:
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      typedef Item Parent;
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      typedef typename Map::Value Value;
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      MapIt() {}
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      MapIt(Invalid i) : Parent(i) { }
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      explicit MapIt(Map& _map) : map(_map) {
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        map.graph.first(*this);
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      }
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      MapIt(const Map& _map, const Item& item)
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        : Parent(item), map(_map) {}
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      MapIt& operator++() {
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        map.graph.next(*this);
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        return *this;
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      }
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      typename MapTraits<Map>::ConstReturnValue operator*() const {
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        return map[*this];
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      }
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      typename MapTraits<Map>::ReturnValue operator*() {
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        return map[*this];
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      }
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      void set(const Value& value) {
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        map.set(*this, value);
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      }
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    protected:
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      Map& map;
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    };
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    class ConstMapIt : public Item {
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    public:
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      typedef Item Parent;
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      typedef typename Map::Value Value;
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      ConstMapIt() {}
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      ConstMapIt(Invalid i) : Parent(i) { }
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      explicit ConstMapIt(Map& _map) : map(_map) {
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        map.graph.first(*this);
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      }
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      ConstMapIt(const Map& _map, const Item& item)
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        : Parent(item), map(_map) {}
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      ConstMapIt& operator++() {
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        map.graph.next(*this);
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        return *this;
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      }
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      typename MapTraits<Map>::ConstReturnValue operator*() const {
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        return map[*this];
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      }
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    protected:
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      const Map& map;
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    };
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    class ItemIt : public Item {
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    public:
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      typedef Item Parent;
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      ItemIt() {}
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      ItemIt(Invalid i) : Parent(i) { }
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      explicit ItemIt(Map& _map) : map(_map) {
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        map.graph.first(*this);
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      }
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      ItemIt(const Map& _map, const Item& item)
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        : Parent(item), map(_map) {}
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      ItemIt& operator++() {
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        map.graph.next(*this);
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        return *this;
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      }
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    protected:
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      const Map& map;
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    };
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  private:
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    const Graph& graph;
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  };
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}
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#endif