LEMON/LEMON-official Changeset - r631:33c6b6e755cd

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Changeset - r631:33c6b6e755cd

« 630:99a31b

635:58f704 »

r631:33c6b6e755cd

Wed, 15 Apr 2009 02:04:37

[Not Reviewed]

0 comments (0 inline)

kpeter (Peter Kovacs)
kpeter@inf.elte.hu

Small doc improvements (#263)

0 19 0

default

19 files changed:

lemon/bin_heap.h

lemon/concepts/graph_components.h

lemon/concepts/heap.h

lemon/dfs.h

lemon/dijkstra.h

lemon/dimacs.h

lemon/graph_to_eps.h

lemon/kruskal.h

lemon/lgf_reader.h

lemon/lgf_writer.h

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lemon/bin_heap.h

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 		/* -*- mode: C++; indent-tabs-mode: nil; -*-
+		 *
 		 * This file is a part of LEMON, a generic C++ optimization library.
+		 *
 		 * Copyright (C) 2003-2009
 		 * 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_BIN_HEAP_H
 		#define LEMON_BIN_HEAP_H
 		///\ingroup auxdat
 		///\file
 		///\brief Binary Heap implementation.
 		#include <vector>
 		#include <utility>
 		#include <functional>
 		namespace lemon {
 		  ///\ingroup auxdat
 		  ///
 		  ///\brief A Binary Heap implementation.
 		  ///
 		  ///This class implements the \e binary \e heap data structure.
 		  ///
 		  ///A \e heap is a data structure for storing items with specified values
 		  ///called \e priorities in such a way that finding the item with minimum
 		  ///priority is efficient. \c Comp specifies the ordering of the priorities.
 		  ///In a heap one can change the priority of an item, add or erase an
 		  ///item, etc.
 		  ///
 		  ///\tparam PR Type of the priority of the items.
 		  ///\tparam IM A read and writable item map with int values, used internally
 		  ///to handle the cross references.
 		  ///\tparam Comp A functor class for the ordering of the priorities.
 		  ///The default is \c std::less<PR>.
 		  ///
 		  ///\sa FibHeap
 		  ///\sa Dijkstra
 		  template <typename PR, typename IM, typename Comp = std::less<PR> >
 		  class BinHeap {
 		  public:
 		    ///\e
 		    typedef IM ItemIntMap;
 		    ///\e
 		    typedef PR Prio;
 		    ///\e
 		    typedef typename ItemIntMap::Key Item;
 		    ///\e
 		    typedef std::pair<Item,Prio> Pair;
 		    ///\e
 		    typedef Comp Compare;
 		    /// \brief Type to represent the items states.
 		    ///
 		    /// Each Item element have a state associated to it. It may be "in heap",
 		    /// "pre heap" or "post heap". The latter two are indifferent from the
 		    /// heap's point of view, but may be useful to the user.
 		    ///
 		    /// The item-int map must be initialized in such way that it assigns
 		    /// \c PRE_HEAP (<tt>-1</tt>) to any element to be put in the heap.
 		    enum State {
 		      IN_HEAP = 0,    ///< \e
 		      PRE_HEAP = -1,  ///< \e
-		      POST_HEAP = -2  ///< \e
+		      IN_HEAP = 0,    ///< = 0.
 		      PRE_HEAP = -1,  ///< = -1.
 		      POST_HEAP = -2  ///< = -2.
 		    };
 		  private:
 		    std::vector<Pair> _data;
 		    Compare _comp;
 		    ItemIntMap &_iim;
 		  public:
 		    /// \brief The constructor.
 		    ///
 		    /// The constructor.
 		    /// \param map should be given to the constructor, since it is used
 		    /// internally to handle the cross references. The value of the map
 		    /// must be \c PRE_HEAP (<tt>-1</tt>) for every item.
 		    explicit BinHeap(ItemIntMap &map) : _iim(map) {}
 		    /// \brief The constructor.
 		    ///
 		    /// The constructor.
 		    /// \param map should be given to the constructor, since it is used
 		    /// internally to handle the cross references. The value of the map
 		    /// should be PRE_HEAP (-1) for each element.
 		    ///
 		    /// \param comp The comparator function object.
 		    BinHeap(ItemIntMap &map, const Compare &comp)
 		      : _iim(map), _comp(comp) {}
 		    /// The number of items stored in the heap.
 		    ///
 		    /// \brief Returns the number of items stored in the heap.
 		    int size() const { return _data.size(); }
 		    /// \brief Checks if the heap stores no items.
 		    ///
 		    /// Returns \c true if and only if the heap stores no items.
 		    bool empty() const { return _data.empty(); }
 		    /// \brief Make empty this heap.
 		    ///
 		    /// Make empty this heap. It does not change the cross reference map.
 		    /// If you want to reuse what is not surely empty you should first clear
 		    /// the heap and after that you should set the cross reference map for
 		    /// each item to \c PRE_HEAP.
 		    void clear() {
 		      _data.clear();
+		    }
 		  private:
 		    static int parent(int i) { return (i-1)/2; }
 		    static int second_child(int i) { return 2*i+2; }
 		    bool less(const Pair &p1, const Pair &p2) const {
 		      return _comp(p1.second, p2.second);
+		    }
 		    int bubble_up(int hole, Pair p) {
 		      int par = parent(hole);
 		      while( hole>0 && less(p,_data[par]) ) {
 		        move(_data[par],hole);
 		        hole = par;
 		        par = parent(hole);
+		      }
 		      move(p, hole);
 		      return hole;
+		    }
 		    int bubble_down(int hole, Pair p, int length) {
 		      int child = second_child(hole);
 		      while(child < length) {
 		        if( less(_data[child-1], _data[child]) ) {
 		          --child;
+		        }
 		        if( !less(_data[child], p) )
 		          goto ok;
 		        move(_data[child], hole);
 		        hole = child;
 		        child = second_child(hole);
+		      }
 		      child--;
 		      if( child<length && less(_data[child], p) ) {
 		        move(_data[child], hole);
 		        hole=child;
+		      }
 		    ok:
 		      move(p, hole);
 		      return hole;
+		    }
 		    void move(const Pair &p, int i) {
 		      _data[i] = p;
 		      _iim.set(p.first, i);
+		    }
 		  public:
 		    /// \brief Insert a pair of item and priority into the heap.
 		    ///
 		    /// Adds \c p.first to the heap with priority \c p.second.
 		    /// \param p The pair to insert.
 		    void push(const Pair &p) {
 		      int n = _data.size();
 		      _data.resize(n+1);
 		      bubble_up(n, p);
+		    }
 		    /// \brief Insert an item into the heap with the given heap.
 		    ///
 		    /// Adds \c i to the heap with priority \c p.
 		    /// \param i The item to insert.
 		    /// \param p The priority of the item.
 		    void push(const Item &i, const Prio &p) { push(Pair(i,p)); }
 		    /// \brief Returns the item with minimum priority relative to \c Compare.
 		    ///
 		    /// This method returns the item with minimum priority relative to \c
 		    /// Compare.
 		    /// \pre The heap must be nonempty.
 		    Item top() const {
 		      return _data[0].first;
+		    }
 		    /// \brief Returns the minimum priority relative to \c Compare.
 		    ///
 		    /// It returns the minimum priority relative to \c Compare.
 		    /// \pre The heap must be nonempty.
 		    Prio prio() const {
 		      return _data[0].second;
+		    }
 		    /// \brief Deletes the item with minimum priority relative to \c Compare.
 		    ///
 		    /// This method deletes the item with minimum priority relative to \c
 		    /// Compare from the heap.
 		    /// \pre The heap must be non-empty.
 		    void pop() {
 		      int n = _data.size()-1;
 		      _iim.set(_data[0].first, POST_HEAP);
 		      if (n > 0) {
 		        bubble_down(0, _data[n], n);
+		      }
 		      _data.pop_back();
+		    }
 		    /// \brief Deletes \c i from the heap.
 		    ///
 		    /// This method deletes item \c i from the heap.
 		    /// \param i The item to erase.
 		    /// \pre The item should be in the heap.
 		    void erase(const Item &i) {
 		      int h = _iim[i];
 		      int n = _data.size()-1;
 		      _iim.set(_data[h].first, POST_HEAP);
 		      if( h < n ) {
 		        if ( bubble_up(h, _data[n]) == h) {
 		          bubble_down(h, _data[n], n);
+		        }
+		      }
 		      _data.pop_back();
+		    }
 		    /// \brief Returns the priority of \c i.
 		    ///
 		    /// This function returns the priority of item \c i.
 		    /// \param i The item.
 		    /// \pre \c i must be in the heap.
 		    Prio operator[](const Item &i) const {
 		      int idx = _iim[i];
 		      return _data[idx].second;
+		    }
 		    /// \brief \c i gets to the heap with priority \c p independently
 		    /// if \c i was already there.
 		    ///
 		    /// This method calls \ref push(\c i, \c p) if \c i is not stored
 		    /// in the heap and sets the priority of \c i to \c p otherwise.
 		    /// \param i The item.
 		    /// \param p The priority.
 		    void set(const Item &i, const Prio &p) {
 		      int idx = _iim[i];
 		      if( idx < 0 ) {
 		        push(i,p);
+		      }
 		      else if( _comp(p, _data[idx].second) ) {
 		        bubble_up(idx, Pair(i,p));
+		      }
 		      else {
 		        bubble_down(idx, Pair(i,p), _data.size());
+		      }
+		    }
 		    /// \brief Decreases the priority of \c i to \c p.
 		    ///
 		    /// This method decreases the priority of item \c i to \c p.
 		    /// \param i The item.
 		    /// \param p The priority.
 		    /// \pre \c i must be stored in the heap with priority at least \c
 		    /// p relative to \c Compare.
 		    void decrease(const Item &i, const Prio &p) {
 		      int idx = _iim[i];
 		      bubble_up(idx, Pair(i,p));
+		    }
 		    /// \brief Increases the priority of \c i to \c p.
 		    ///
 		    /// This method sets the priority of item \c i to \c p.
 		    /// \param i The item.
 		    /// \param p The priority.
 		    /// \pre \c i must be stored in the heap with priority at most \c
 		    /// p relative to \c Compare.
 		    void increase(const Item &i, const Prio &p) {
 		      int idx = _iim[i];
 		      bubble_down(idx, Pair(i,p), _data.size());
+		    }
 		    /// \brief Returns if \c item is in, has already been in, or has
 		    /// never been in the heap.
 		    ///
 		    /// This method returns PRE_HEAP if \c item has never been in the
 		    /// heap, IN_HEAP if it is in the heap at the moment, and POST_HEAP
 		    /// otherwise. In the latter case it is possible that \c item will
 		    /// get back to the heap again.
 		    /// \param i The item.
 		    State state(const Item &i) const {
 		      int s = _iim[i];
 		      if( s>=0 )
 		        s=0;
 		      return State(s);
+		    }
 		    /// \brief Sets the state of the \c item in the heap.
 		    ///
 		    /// Sets the state of the \c item in the heap. It can be used to
 		    /// manually clear the heap when it is important to achive the
 		    /// better time complexity.
 		    /// \param i The item.
 		    /// \param st The state. It should not be \c IN_HEAP.
 		    void state(const Item& i, State st) {
 		      switch (st) {
 		      case POST_HEAP:
 		      case PRE_HEAP:
 		        if (state(i) == IN_HEAP) {
 		          erase(i);
+		        }
 		        _iim[i] = st;
 		        break;
 		      case IN_HEAP:
 		        break;
+		      }
+		    }
 		    /// \brief Replaces an item in the heap.
 		    ///
 		    /// The \c i item is replaced with \c j item. The \c i item should
 		    /// be in the heap, while the \c j should be out of the heap. The
 		    /// \c i item will out of the heap and \c j will be in the heap

lemon/concepts/graph_components.h

Show inline comments

@@ -349,729 +349,729 @@
 		        void constraints() {
 		          checkConcept<Base, _Digraph >();
 		          typename _Digraph::Node node;
 		          int nid = digraph.id(node);
 		          nid = digraph.id(node);
 		          node = digraph.nodeFromId(nid);
 		          typename _Digraph::Arc arc;
 		          int eid = digraph.id(arc);
 		          eid = digraph.id(arc);
 		          arc = digraph.arcFromId(eid);
 		          nid = digraph.maxNodeId();
 		          ignore_unused_variable_warning(nid);
 		          eid = digraph.maxArcId();
 		          ignore_unused_variable_warning(eid);
+		        }
 		        const _Digraph& digraph;
 		      };
 		    };
 		    /// \brief Skeleton class for \e idable undirected graphs.
 		    ///
 		    /// This class describes the interface of \e idable undirected
 		    /// graphs. It extends \ref IDableDigraphComponent with the core ID
 		    /// functions of undirected graphs.
 		    /// The ids of the items must be unique and immutable.
 		    /// This concept is part of the Graph concept.
 		    template <typename BAS = BaseGraphComponent>
 		    class IDableGraphComponent : public IDableDigraphComponent<BAS> {
 		    public:
 		      typedef BAS Base;
 		      typedef typename Base::Edge Edge;
 		      using IDableDigraphComponent<Base>::id;
 		      /// \brief Return a unique integer id for the given edge.
 		      ///
 		      /// This function returns a unique integer id for the given edge.
 		      int id(const Edge&) const { return -1; }
 		      /// \brief Return the edge by its unique id.
 		      ///
 		      /// This function returns the edge by its unique id.
 		      /// If the graph does not contain an edge with the given id,
 		      /// then the result of the function is undefined.
 		      Edge edgeFromId(int) const { return INVALID; }
 		      /// \brief Return an integer greater or equal to the maximum
 		      /// edge id.
 		      ///
 		      /// This function returns an integer greater or equal to the
 		      /// maximum edge id.
 		      int maxEdgeId() const { return -1; }
 		      template <typename _Graph>
 		      struct Constraints {
 		        void constraints() {
 		          checkConcept<IDableDigraphComponent<Base>, _Graph >();
 		          typename _Graph::Edge edge;
 		          int ueid = graph.id(edge);
 		          ueid = graph.id(edge);
 		          edge = graph.edgeFromId(ueid);
 		          ueid = graph.maxEdgeId();
 		          ignore_unused_variable_warning(ueid);
+		        }
 		        const _Graph& graph;
 		      };
 		    };
 		    /// \brief Concept class for \c NodeIt, \c ArcIt and \c EdgeIt types.
 		    ///
 		    /// This class describes the concept of \c NodeIt, \c ArcIt and
 		    /// \c EdgeIt subtypes of digraph and graph types.
 		    template <typename GR, typename Item>
 		    class GraphItemIt : public Item {
 		    public:
 		      /// \brief Default constructor.
 		      ///
 		      /// Default constructor.
 		      /// \warning The default constructor is not required to set
 		      /// the iterator to some well-defined value. So you should consider it
 		      /// as uninitialized.
 		      GraphItemIt() {}
 		      /// \brief Copy constructor.
 		      ///
 		      /// Copy constructor.
 		      GraphItemIt(const GraphItemIt& it) : Item(it) {}
 		      /// \brief Constructor that sets the iterator to the first item.
 		      ///
 		      /// Constructor that sets the iterator to the first item.
 		      explicit GraphItemIt(const GR&) {}
 		      /// \brief Constructor for conversion from \c INVALID.
 		      ///
 		      /// Constructor for conversion from \c INVALID.
 		      /// It initializes the iterator to be invalid.
 		      /// \sa Invalid for more details.
 		      GraphItemIt(Invalid) {}
 		      /// \brief Assignment operator.
 		      ///
 		      /// Assignment operator for the iterator.
 		      GraphItemIt& operator=(const GraphItemIt&) { return *this; }
 		      /// \brief Increment the iterator.
 		      ///
 		      /// This operator increments the iterator, i.e. assigns it to the
 		      /// next item.
 		      GraphItemIt& operator++() { return *this; }
 		      /// \brief Equality operator
 		      ///
 		      /// Equality operator.
 		      /// Two iterators are equal if and only if they point to the
 		      /// same object or both are invalid.
 		      bool operator==(const GraphItemIt&) const { return true;}
 		      /// \brief Inequality operator
 		      ///
 		      /// Inequality operator.
 		      /// Two iterators are equal if and only if they point to the
 		      /// same object or both are invalid.
 		      bool operator!=(const GraphItemIt&) const { return true;}
 		      template<typename _GraphItemIt>
 		      struct Constraints {
 		        void constraints() {
 		          checkConcept<GraphItem<>, _GraphItemIt>();
 		          _GraphItemIt it1(g);
 		          _GraphItemIt it2;
 		          _GraphItemIt it3 = it1;
 		          _GraphItemIt it4 = INVALID;
 		          it2 = ++it1;
 		          ++it2 = it1;
 		          ++(++it1);
 		          Item bi = it1;
 		          bi = it2;
+		        }
 		        const GR& g;
 		      };
 		    };
 		    /// \brief Concept class for \c InArcIt, \c OutArcIt and
 		    /// \c IncEdgeIt types.
 		    ///
 		    /// This class describes the concept of \c InArcIt, \c OutArcIt
 		    /// and \c IncEdgeIt subtypes of digraph and graph types.
 		    ///
 		    /// \note Since these iterator classes do not inherit from the same
 		    /// base class, there is an additional template parameter (selector)
 		    /// \c sel. For \c InArcIt you should instantiate it with character
 		    /// \c 'i', for \c OutArcIt with \c 'o' and for \c IncEdgeIt with \c 'e'.
 		    template <typename GR,
 		              typename Item = typename GR::Arc,
 		              typename Base = typename GR::Node,
 		              char sel = '0'>
 		    class GraphIncIt : public Item {
 		    public:
 		      /// \brief Default constructor.
 		      ///
 		      /// Default constructor.
 		      /// \warning The default constructor is not required to set
 		      /// the iterator to some well-defined value. So you should consider it
 		      /// as uninitialized.
 		      GraphIncIt() {}
 		      /// \brief Copy constructor.
 		      ///
 		      /// Copy constructor.
 		      GraphIncIt(const GraphIncIt& it) : Item(it) {}
 		      /// \brief Constructor that sets the iterator to the first
 		      /// incoming or outgoing arc.
 		      ///
 		      /// Constructor that sets the iterator to the first arc
 		      /// incoming to or outgoing from the given node.
 		      explicit GraphIncIt(const GR&, const Base&) {}
 		      /// \brief Constructor for conversion from \c INVALID.
 		      ///
 		      /// Constructor for conversion from \c INVALID.
 		      /// It initializes the iterator to be invalid.
 		      /// \sa Invalid for more details.
 		      GraphIncIt(Invalid) {}
 		      /// \brief Assignment operator.
 		      ///
 		      /// Assignment operator for the iterator.
 		      GraphIncIt& operator=(const GraphIncIt&) { return *this; }
 		      /// \brief Increment the iterator.
 		      ///
 		      /// This operator increments the iterator, i.e. assigns it to the
 		      /// next arc incoming to or outgoing from the given node.
 		      GraphIncIt& operator++() { return *this; }
 		      /// \brief Equality operator
 		      ///
 		      /// Equality operator.
 		      /// Two iterators are equal if and only if they point to the
 		      /// same object or both are invalid.
 		      bool operator==(const GraphIncIt&) const { return true;}
 		      /// \brief Inequality operator
 		      ///
 		      /// Inequality operator.
 		      /// Two iterators are equal if and only if they point to the
 		      /// same object or both are invalid.
 		      bool operator!=(const GraphIncIt&) const { return true;}
 		      template <typename _GraphIncIt>
 		      struct Constraints {
 		        void constraints() {
 		          checkConcept<GraphItem<sel>, _GraphIncIt>();
 		          _GraphIncIt it1(graph, node);
 		          _GraphIncIt it2;
 		          _GraphIncIt it3 = it1;
 		          _GraphIncIt it4 = INVALID;
 		          it2 = ++it1;
 		          ++it2 = it1;
 		          ++(++it1);
 		          Item e = it1;
 		          e = it2;
+		        }
 		        const Base& node;
 		        const GR& graph;
 		      };
 		    };
 		    /// \brief Skeleton class for iterable directed graphs.
 		    ///
 		    /// This class describes the interface of iterable directed
 		    /// graphs. It extends \ref BaseDigraphComponent with the core
 		    /// iterable interface.
 		    /// This concept is part of the Digraph concept.
 		    template <typename BAS = BaseDigraphComponent>
 		    class IterableDigraphComponent : public BAS {
 		    public:
 		      typedef BAS Base;
 		      typedef typename Base::Node Node;
 		      typedef typename Base::Arc Arc;
 		      typedef IterableDigraphComponent Digraph;
-		      /// \name Base iteration
+		      /// \name Base Iteration
 		      ///
 		      /// This interface provides functions for iteration on digraph items.
 		      ///
 		      /// @{
 		      /// \brief Return the first node.
 		      ///
 		      /// This function gives back the first node in the iteration order.
 		      void first(Node&) const {}
 		      /// \brief Return the next node.
 		      ///
 		      /// This function gives back the next node in the iteration order.
 		      void next(Node&) const {}
 		      /// \brief Return the first arc.
 		      ///
 		      /// This function gives back the first arc in the iteration order.
 		      void first(Arc&) const {}
 		      /// \brief Return the next arc.
 		      ///
 		      /// This function gives back the next arc in the iteration order.
 		      void next(Arc&) const {}
 		      /// \brief Return the first arc incomming to the given node.
 		      ///
 		      /// This function gives back the first arc incomming to the
 		      /// given node.
 		      void firstIn(Arc&, const Node&) const {}
 		      /// \brief Return the next arc incomming to the given node.
 		      ///
 		      /// This function gives back the next arc incomming to the
 		      /// given node.
 		      void nextIn(Arc&) const {}
 		      /// \brief Return the first arc outgoing form the given node.
 		      ///
 		      /// This function gives back the first arc outgoing form the
 		      /// given node.
 		      void firstOut(Arc&, const Node&) const {}
 		      /// \brief Return the next arc outgoing form the given node.
 		      ///
 		      /// This function gives back the next arc outgoing form the
 		      /// given node.
 		      void nextOut(Arc&) const {}
 		      /// @}
-		      /// \name Class based iteration
+		      /// \name Class Based Iteration
 		      ///
 		      /// This interface provides iterator classes for digraph items.
 		      ///
 		      /// @{
 		      /// \brief This iterator goes through each node.
 		      ///
 		      /// This iterator goes through each node.
 		      ///
 		      typedef GraphItemIt<Digraph, Node> NodeIt;
 		      /// \brief This iterator goes through each arc.
 		      ///
 		      /// This iterator goes through each arc.
 		      ///
 		      typedef GraphItemIt<Digraph, Arc> ArcIt;
 		      /// \brief This iterator goes trough the incoming arcs of a node.
 		      ///
 		      /// This iterator goes trough the \e incoming arcs of a certain node
 		      /// of a digraph.
 		      typedef GraphIncIt<Digraph, Arc, Node, 'i'> InArcIt;
 		      /// \brief This iterator goes trough the outgoing arcs of a node.
 		      ///
 		      /// This iterator goes trough the \e outgoing arcs of a certain node
 		      /// of a digraph.
 		      typedef GraphIncIt<Digraph, Arc, Node, 'o'> OutArcIt;
 		      /// \brief The base node of the iterator.
 		      ///
 		      /// This function gives back the base node of the iterator.
 		      /// It is always the target node of the pointed arc.
 		      Node baseNode(const InArcIt&) const { return INVALID; }
 		      /// \brief The running node of the iterator.
 		      ///
 		      /// This function gives back the running node of the iterator.
 		      /// It is always the source node of the pointed arc.
 		      Node runningNode(const InArcIt&) const { return INVALID; }
 		      /// \brief The base node of the iterator.
 		      ///
 		      /// This function gives back the base node of the iterator.
 		      /// It is always the source node of the pointed arc.
 		      Node baseNode(const OutArcIt&) const { return INVALID; }
 		      /// \brief The running node of the iterator.
 		      ///
 		      /// This function gives back the running node of the iterator.
 		      /// It is always the target node of the pointed arc.
 		      Node runningNode(const OutArcIt&) const { return INVALID; }
 		      /// @}
 		      template <typename _Digraph>
 		      struct Constraints {
 		        void constraints() {
 		          checkConcept<Base, _Digraph>();
+		          {
 		            typename _Digraph::Node node(INVALID);
 		            typename _Digraph::Arc arc(INVALID);
+		            {
 		              digraph.first(node);
 		              digraph.next(node);
+		            }
+		            {
 		              digraph.first(arc);
 		              digraph.next(arc);
+		            }
+		            {
 		              digraph.firstIn(arc, node);
 		              digraph.nextIn(arc);
+		            }
+		            {
 		              digraph.firstOut(arc, node);
 		              digraph.nextOut(arc);
+		            }
+		          }
+		          {
 		            checkConcept<GraphItemIt<_Digraph, typename _Digraph::Arc>,
 		              typename _Digraph::ArcIt >();
 		            checkConcept<GraphItemIt<_Digraph, typename _Digraph::Node>,
 		              typename _Digraph::NodeIt >();
 		            checkConcept<GraphIncIt<_Digraph, typename _Digraph::Arc,
 		              typename _Digraph::Node, 'i'>, typename _Digraph::InArcIt>();
 		            checkConcept<GraphIncIt<_Digraph, typename _Digraph::Arc,
 		              typename _Digraph::Node, 'o'>, typename _Digraph::OutArcIt>();
 		            typename _Digraph::Node n;
 		            const typename _Digraph::InArcIt iait(INVALID);
 		            const typename _Digraph::OutArcIt oait(INVALID);
 		            n = digraph.baseNode(iait);
 		            n = digraph.runningNode(iait);
 		            n = digraph.baseNode(oait);
 		            n = digraph.runningNode(oait);
 		            ignore_unused_variable_warning(n);
+		          }
+		        }
 		        const _Digraph& digraph;
 		      };
 		    };
 		    /// \brief Skeleton class for iterable undirected graphs.
 		    ///
 		    /// This class describes the interface of iterable undirected
 		    /// graphs. It extends \ref IterableDigraphComponent with the core
 		    /// iterable interface of undirected graphs.
 		    /// This concept is part of the Graph concept.
 		    template <typename BAS = BaseGraphComponent>
 		    class IterableGraphComponent : public IterableDigraphComponent<BAS> {
 		    public:
 		      typedef BAS Base;
 		      typedef typename Base::Node Node;
 		      typedef typename Base::Arc Arc;
 		      typedef typename Base::Edge Edge;
 		      typedef IterableGraphComponent Graph;
-		      /// \name Base iteration
+		      /// \name Base Iteration
 		      ///
 		      /// This interface provides functions for iteration on edges.
 		      ///
 		      /// @{
 		      using IterableDigraphComponent<Base>::first;
 		      using IterableDigraphComponent<Base>::next;
 		      /// \brief Return the first edge.
 		      ///
 		      /// This function gives back the first edge in the iteration order.
 		      void first(Edge&) const {}
 		      /// \brief Return the next edge.
 		      ///
 		      /// This function gives back the next edge in the iteration order.
 		      void next(Edge&) const {}
 		      /// \brief Return the first edge incident to the given node.
 		      ///
 		      /// This function gives back the first edge incident to the given
 		      /// node. The bool parameter gives back the direction for which the
 		      /// source node of the directed arc representing the edge is the
 		      /// given node.
 		      void firstInc(Edge&, bool&, const Node&) const {}
 		      /// \brief Gives back the next of the edges from the
 		      /// given node.
 		      ///
 		      /// This function gives back the next edge incident to the given
 		      /// node. The bool parameter should be used as \c firstInc() use it.
 		      void nextInc(Edge&, bool&) const {}
 		      using IterableDigraphComponent<Base>::baseNode;
 		      using IterableDigraphComponent<Base>::runningNode;
 		      /// @}
-		      /// \name Class based iteration
+		      /// \name Class Based Iteration
 		      ///
 		      /// This interface provides iterator classes for edges.
 		      ///
 		      /// @{
 		      /// \brief This iterator goes through each edge.
 		      ///
 		      /// This iterator goes through each edge.
 		      typedef GraphItemIt<Graph, Edge> EdgeIt;
 		      /// \brief This iterator goes trough the incident edges of a
 		      /// node.
 		      ///
 		      /// This iterator goes trough the incident edges of a certain
 		      /// node of a graph.
 		      typedef GraphIncIt<Graph, Edge, Node, 'e'> IncEdgeIt;
 		      /// \brief The base node of the iterator.
 		      ///
 		      /// This function gives back the base node of the iterator.
 		      Node baseNode(const IncEdgeIt&) const { return INVALID; }
 		      /// \brief The running node of the iterator.
 		      ///
 		      /// This function gives back the running node of the iterator.
 		      Node runningNode(const IncEdgeIt&) const { return INVALID; }
 		      /// @}
 		      template <typename _Graph>
 		      struct Constraints {
 		        void constraints() {
 		          checkConcept<IterableDigraphComponent<Base>, _Graph>();
+		          {
 		            typename _Graph::Node node(INVALID);
 		            typename _Graph::Edge edge(INVALID);
 		            bool dir;
+		            {
 		              graph.first(edge);
 		              graph.next(edge);
+		            }
+		            {
 		              graph.firstInc(edge, dir, node);
 		              graph.nextInc(edge, dir);
+		            }
+		          }
+		          {
 		            checkConcept<GraphItemIt<_Graph, typename _Graph::Edge>,
 		              typename _Graph::EdgeIt >();
 		            checkConcept<GraphIncIt<_Graph, typename _Graph::Edge,
 		              typename _Graph::Node, 'e'>, typename _Graph::IncEdgeIt>();
 		            typename _Graph::Node n;
 		            const typename _Graph::IncEdgeIt ieit(INVALID);
 		            n = graph.baseNode(ieit);
 		            n = graph.runningNode(ieit);
+		          }
+		        }
 		        const _Graph& graph;
 		      };
 		    };
 		    /// \brief Skeleton class for alterable directed graphs.
 		    ///
 		    /// This class describes the interface of alterable directed
 		    /// graphs. It extends \ref BaseDigraphComponent with the alteration
 		    /// notifier interface. It implements
 		    /// an observer-notifier pattern for each digraph item. More
 		    /// obsevers can be registered into the notifier and whenever an
 		    /// alteration occured in the digraph all the observers will be
 		    /// notified about it.
 		    template <typename BAS = BaseDigraphComponent>
 		    class AlterableDigraphComponent : public BAS {
 		    public:
 		      typedef BAS Base;
 		      typedef typename Base::Node Node;
 		      typedef typename Base::Arc Arc;
 		      /// Node alteration notifier class.
 		      typedef AlterationNotifier<AlterableDigraphComponent, Node>
 		      NodeNotifier;
 		      /// Arc alteration notifier class.
 		      typedef AlterationNotifier<AlterableDigraphComponent, Arc>
 		      ArcNotifier;
 		      /// \brief Return the node alteration notifier.
 		      ///
 		      /// This function gives back the node alteration notifier.
 		      NodeNotifier& notifier(Node) const {
 		         return NodeNotifier();
+		      }
 		      /// \brief Return the arc alteration notifier.
 		      ///
 		      /// This function gives back the arc alteration notifier.
 		      ArcNotifier& notifier(Arc) const {
 		        return ArcNotifier();
+		      }
 		      template <typename _Digraph>
 		      struct Constraints {
 		        void constraints() {
 		          checkConcept<Base, _Digraph>();
 		          typename _Digraph::NodeNotifier& nn
 		            = digraph.notifier(typename _Digraph::Node());
 		          typename _Digraph::ArcNotifier& en
 		            = digraph.notifier(typename _Digraph::Arc());
 		          ignore_unused_variable_warning(nn);
 		          ignore_unused_variable_warning(en);
+		        }
 		        const _Digraph& digraph;
 		      };
 		    };
 		    /// \brief Skeleton class for alterable undirected graphs.
 		    ///
 		    /// This class describes the interface of alterable undirected
 		    /// graphs. It extends \ref AlterableDigraphComponent with the alteration
 		    /// notifier interface of undirected graphs. It implements
 		    /// an observer-notifier pattern for the edges. More
 		    /// obsevers can be registered into the notifier and whenever an
 		    /// alteration occured in the graph all the observers will be
 		    /// notified about it.
 		    template <typename BAS = BaseGraphComponent>
 		    class AlterableGraphComponent : public AlterableDigraphComponent<BAS> {
 		    public:
 		      typedef BAS Base;
 		      typedef typename Base::Edge Edge;
 		      /// Edge alteration notifier class.
 		      typedef AlterationNotifier<AlterableGraphComponent, Edge>
 		      EdgeNotifier;
 		      /// \brief Return the edge alteration notifier.
 		      ///
 		      /// This function gives back the edge alteration notifier.
 		      EdgeNotifier& notifier(Edge) const {
 		        return EdgeNotifier();
+		      }
 		      template <typename _Graph>
 		      struct Constraints {
 		        void constraints() {
 		          checkConcept<AlterableDigraphComponent<Base>, _Graph>();
 		          typename _Graph::EdgeNotifier& uen
 		            = graph.notifier(typename _Graph::Edge());
 		          ignore_unused_variable_warning(uen);
+		        }
 		        const _Graph& graph;
 		      };
 		    };
 		    /// \brief Concept class for standard graph maps.
 		    ///
 		    /// This class describes the concept of standard graph maps, i.e.
 		    /// the \c NodeMap, \c ArcMap and \c EdgeMap subtypes of digraph and
 		    /// graph types, which can be used for associating data to graph items.
 		    /// The standard graph maps must conform to the ReferenceMap concept.
 		    template <typename GR, typename K, typename V>
 		    class GraphMap : public ReferenceMap<K, V, V&, const V&> {
 		    public:
 		      typedef ReadWriteMap<K, V> Parent;
 		      /// The graph type of the map.
 		      typedef GR Graph;
 		      /// The key type of the map.
 		      typedef K Key;
 		      /// The value type of the map.
 		      typedef V Value;
 		      /// The reference type of the map.
 		      typedef Value& Reference;
 		      /// The const reference type of the map.
 		      typedef const Value& ConstReference;
 		      // The reference map tag.
 		      typedef True ReferenceMapTag;
 		      /// \brief Construct a new map.
 		      ///
 		      /// Construct a new map for the graph.
 		      explicit GraphMap(const Graph&) {}
 		      /// \brief Construct a new map with default value.
 		      ///
 		      /// Construct a new map for the graph and initalize the values.
 		      GraphMap(const Graph&, const Value&) {}
 		    private:
 		      /// \brief Copy constructor.
 		      ///
 		      /// Copy Constructor.
 		      GraphMap(const GraphMap&) : Parent() {}
 		      /// \brief Assignment operator.
 		      ///
 		      /// Assignment operator. It does not mofify the underlying graph,
 		      /// it just iterates on the current item set and set the  map
 		      /// with the value returned by the assigned map.
 		      template <typename CMap>
 		      GraphMap& operator=(const CMap&) {
 		        checkConcept<ReadMap<Key, Value>, CMap>();
 		        return *this;
+		      }
 		    public:
 		      template<typename _Map>
 		      struct Constraints {
 		        void constraints() {
 		          checkConcept
 		            <ReferenceMap<Key, Value, Value&, const Value&>, _Map>();
 		          _Map m1(g);
 		          _Map m2(g,t);
 		          // Copy constructor
 		          // _Map m3(m);
 		          // Assignment operator
 		          // ReadMap<Key, Value> cmap;
 		          // m3 = cmap;
 		          ignore_unused_variable_warning(m1);
 		          ignore_unused_variable_warning(m2);
 		          // ignore_unused_variable_warning(m3);
+		        }
 		        const _Map &m;
 		        const Graph &g;
 		        const typename GraphMap::Value &t;
 		      };
 		    };
 		    /// \brief Skeleton class for mappable directed graphs.
 		    ///
 		    /// This class describes the interface of mappable directed graphs.
 		    /// It extends \ref BaseDigraphComponent with the standard digraph
 		    /// map classes, namely \c NodeMap and \c ArcMap.
 		    /// This concept is part of the Digraph concept.
 		    template <typename BAS = BaseDigraphComponent>
 		    class MappableDigraphComponent : public BAS  {
 		    public:
 		      typedef BAS Base;
 		      typedef typename Base::Node Node;

lemon/concepts/heap.h

Show inline comments

 		/* -*- mode: C++; indent-tabs-mode: nil; -*-
+		 *
 		 * This file is a part of LEMON, a generic C++ optimization library.
+		 *
 		 * Copyright (C) 2003-2009
 		 * 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.
+		 *
 		 */
 		///\ingroup concept
 		///\file
 		///\brief The concept of heaps.
 		#ifndef LEMON_CONCEPTS_HEAP_H
 		#define LEMON_CONCEPTS_HEAP_H
 		#include <lemon/core.h>
 		#include <lemon/concept_check.h>
 		namespace lemon {
 		  namespace concepts {
 		    /// \addtogroup concept
 		    /// @{
 		    /// \brief The heap concept.
 		    ///
 		    /// Concept class describing the main interface of heaps. A \e heap
 		    /// is a data structure for storing items with specified values called
 		    /// \e priorities in such a way that finding the item with minimum
 		    /// priority is efficient. In a heap one can change the priority of an
 		    /// item, add or erase an item, etc.
 		    ///
 		    /// \tparam PR Type of the priority of the items.
 		    /// \tparam IM A read and writable item map with int values, used
 		    /// internally to handle the cross references.
 		    /// \tparam Comp A functor class for the ordering of the priorities.
 		    /// The default is \c std::less<PR>.
 		#ifdef DOXYGEN
 		    template <typename PR, typename IM, typename Comp = std::less<PR> >
 		#else
 		    template <typename PR, typename IM>
 		#endif
 		    class Heap {
 		    public:
 		      /// Type of the item-int map.
 		      typedef IM ItemIntMap;
 		      /// Type of the priorities.
 		      typedef PR Prio;
 		      /// Type of the items stored in the heap.
 		      typedef typename ItemIntMap::Key Item;
 		      /// \brief Type to represent the states of the items.
 		      ///
 		      /// Each item has a state associated to it. It can be "in heap",
 		      /// "pre heap" or "post heap". The later two are indifferent
 		      /// from the point of view of the heap, but may be useful for
 		      /// the user.
 		      ///
 		      /// The item-int map must be initialized in such way that it assigns
 		      /// \c PRE_HEAP (<tt>-1</tt>) to any element to be put in the heap.
 		      enum State {
 		        IN_HEAP = 0,    ///< The "in heap" state constant.
 		        PRE_HEAP = -1,  ///< The "pre heap" state constant.
-		        POST_HEAP = -2  ///< The "post heap" state constant.
+		        IN_HEAP = 0,    ///< = 0. The "in heap" state constant.
 		        PRE_HEAP = -1,  ///< = -1. The "pre heap" state constant.
 		        POST_HEAP = -2  ///< = -2. The "post heap" state constant.
 		      };
 		      /// \brief The constructor.
 		      ///
 		      /// The constructor.
 		      /// \param map A map that assigns \c int values to keys of type
 		      /// \c Item. It is used internally by the heap implementations to
 		      /// handle the cross references. The assigned value must be
 		      /// \c PRE_HEAP (<tt>-1</tt>) for every item.
 		      explicit Heap(ItemIntMap &map) {}
 		      /// \brief The number of items stored in the heap.
 		      ///
 		      /// Returns the number of items stored in the heap.
 		      int size() const { return 0; }
 		      /// \brief Checks if the heap is empty.
 		      ///
 		      /// Returns \c true if the heap is empty.
 		      bool empty() const { return false; }
 		      /// \brief Makes the heap empty.
 		      ///
 		      /// Makes the heap empty.
 		      void clear();
 		      /// \brief Inserts an item into the heap with the given priority.
 		      ///
 		      /// Inserts the given item into the heap with the given priority.
 		      /// \param i The item to insert.
 		      /// \param p The priority of the item.
 		      void push(const Item &i, const Prio &p) {}
 		      /// \brief Returns the item having minimum priority.
 		      ///
 		      /// Returns the item having minimum priority.
 		      /// \pre The heap must be non-empty.
 		      Item top() const {}
 		      /// \brief The minimum priority.
 		      ///
 		      /// Returns the minimum priority.
 		      /// \pre The heap must be non-empty.
 		      Prio prio() const {}
 		      /// \brief Removes the item having minimum priority.
 		      ///
 		      /// Removes the item having minimum priority.
 		      /// \pre The heap must be non-empty.
 		      void pop() {}
 		      /// \brief Removes an item from the heap.
 		      ///
 		      /// Removes the given item from the heap if it is already stored.
 		      /// \param i The item to delete.
 		      void erase(const Item &i) {}
 		      /// \brief The priority of an item.
 		      ///
 		      /// Returns the priority of the given item.
 		      /// \param i The item.
 		      /// \pre \c i must be in the heap.
 		      Prio operator[](const Item &i) const {}
 		      /// \brief Sets the priority of an item or inserts it, if it is
 		      /// not stored in the heap.
 		      ///
 		      /// This method sets the priority of the given item if it is
 		      /// already stored in the heap.
 		      /// Otherwise it inserts the given item with the given priority.
 		      ///
 		      /// \param i The item.
 		      /// \param p The priority.
 		      void set(const Item &i, const Prio &p) {}
 		      /// \brief Decreases the priority of an item to the given value.
 		      ///
 		      /// Decreases the priority of an item to the given value.
 		      /// \param i The item.
 		      /// \param p The priority.
 		      /// \pre \c i must be stored in the heap with priority at least \c p.
 		      void decrease(const Item &i, const Prio &p) {}
 		      /// \brief Increases the priority of an item to the given value.
 		      ///
 		      /// Increases the priority of an item to the given value.
 		      /// \param i The item.
 		      /// \param p The priority.
 		      /// \pre \c i must be stored in the heap with priority at most \c p.
 		      void increase(const Item &i, const Prio &p) {}
 		      /// \brief Returns if an item is in, has already been in, or has
 		      /// never been in the heap.
 		      ///
 		      /// This method returns \c PRE_HEAP if the given item has never
 		      /// been in the heap, \c IN_HEAP if it is in the heap at the moment,
 		      /// and \c POST_HEAP otherwise.
 		      /// In the latter case it is possible that the item will get back
 		      /// to the heap again.
 		      /// \param i The item.
 		      State state(const Item &i) const {}
 		      /// \brief Sets the state of an item in the heap.
 		      ///
 		      /// Sets the state of the given item in the heap. It can be used
 		      /// to manually clear the heap when it is important to achive the
 		      /// better time complexity.
 		      /// \param i The item.
 		      /// \param st The state. It should not be \c IN_HEAP.
 		      void state(const Item& i, State st) {}
 		      template <typename _Heap>
 		      struct Constraints {
 		      public:
 		        void constraints() {
 		          typedef typename _Heap::Item OwnItem;
 		          typedef typename _Heap::Prio OwnPrio;
 		          typedef typename _Heap::State OwnState;
 		          Item item;
 		          Prio prio;
 		          item=Item();
 		          prio=Prio();
 		          ignore_unused_variable_warning(item);
 		          ignore_unused_variable_warning(prio);
 		          OwnItem own_item;
 		          OwnPrio own_prio;
 		          OwnState own_state;
 		          own_item=Item();
 		          own_prio=Prio();
 		          ignore_unused_variable_warning(own_item);
 		          ignore_unused_variable_warning(own_prio);
 		          ignore_unused_variable_warning(own_state);
 		          _Heap heap1(map);
 		          _Heap heap2 = heap1;
 		          ignore_unused_variable_warning(heap1);
 		          ignore_unused_variable_warning(heap2);
 		          int s = heap.size();
 		          ignore_unused_variable_warning(s);
 		          bool e = heap.empty();
 		          ignore_unused_variable_warning(e);
 		          prio = heap.prio();
 		          item = heap.top();
 		          prio = heap[item];
 		          own_prio = heap.prio();
 		          own_item = heap.top();
 		          own_prio = heap[own_item];
 		          heap.push(item, prio);
 		          heap.push(own_item, own_prio);
 		          heap.pop();
 		          heap.set(item, prio);
 		          heap.decrease(item, prio);
 		          heap.increase(item, prio);
 		          heap.set(own_item, own_prio);
 		          heap.decrease(own_item, own_prio);
 		          heap.increase(own_item, own_prio);
 		          heap.erase(item);
 		          heap.erase(own_item);
 		          heap.clear();
 		          own_state = heap.state(own_item);
 		          heap.state(own_item, own_state);
 		          own_state = _Heap::PRE_HEAP;
 		          own_state = _Heap::IN_HEAP;
 		          own_state = _Heap::POST_HEAP;
+		        }
 		        _Heap& heap;
 		        ItemIntMap& map;
 		      };
 		    };
 		    /// @}
 		  } // namespace lemon
+		}
 		#endif

lemon/dfs.h

Show inline comments

 		/* -*- mode: C++; indent-tabs-mode: nil; -*-
+		 *
 		 * This file is a part of LEMON, a generic C++ optimization library.
+		 *
 		 * Copyright (C) 2003-2009
 		 * 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_DFS_H
 		#define LEMON_DFS_H
 		///\ingroup search
 		///\file
 		///\brief DFS algorithm.
 		#include <lemon/list_graph.h>
 		#include <lemon/bits/path_dump.h>
 		#include <lemon/core.h>
 		#include <lemon/error.h>
 		#include <lemon/maps.h>
 		#include <lemon/path.h>
 		namespace lemon {
 		  ///Default traits class of Dfs class.
 		  ///Default traits class of Dfs class.
 		  ///\tparam GR Digraph type.
 		  template<class GR>
 		  struct DfsDefaultTraits
+		  {
 		    ///The type of the digraph the algorithm runs on.
 		    typedef GR Digraph;
 		    ///\brief The type of the map that stores the predecessor
 		    ///arcs of the %DFS paths.
 		    ///
 		    ///The type of the map that stores the predecessor
 		    ///arcs of the %DFS paths.
 		    ///It must meet the \ref concepts::WriteMap "WriteMap" concept.
 		    typedef typename Digraph::template NodeMap<typename Digraph::Arc> PredMap;
 		    ///Instantiates a \c PredMap.
 		    ///This function instantiates a \ref PredMap.
 		    ///\param g is the digraph, to which we would like to define the
 		    ///\ref PredMap.
 		    static PredMap *createPredMap(const Digraph &g)
+		    {
 		      return new PredMap(g);
+		    }
 		    ///The type of the map that indicates which nodes are processed.
 		    ///The type of the map that indicates which nodes are processed.
 		    ///It must meet the \ref concepts::WriteMap "WriteMap" concept.
 		    typedef NullMap<typename Digraph::Node,bool> ProcessedMap;
 		    ///Instantiates a \c ProcessedMap.
 		    ///This function instantiates a \ref ProcessedMap.
 		    ///\param g is the digraph, to which
 		    ///we would like to define the \ref ProcessedMap.
 		#ifdef DOXYGEN
 		    static ProcessedMap *createProcessedMap(const Digraph &g)
 		#else
 		    static ProcessedMap *createProcessedMap(const Digraph &)
 		#endif
+		    {
 		      return new ProcessedMap();
+		    }
 		    ///The type of the map that indicates which nodes are reached.
 		    ///The type of the map that indicates which nodes are reached.
 		    ///It must meet the \ref concepts::ReadWriteMap "ReadWriteMap" concept.
 		    typedef typename Digraph::template NodeMap<bool> ReachedMap;
 		    ///Instantiates a \c ReachedMap.
 		    ///This function instantiates a \ref ReachedMap.
 		    ///\param g is the digraph, to which
 		    ///we would like to define the \ref ReachedMap.
 		    static ReachedMap *createReachedMap(const Digraph &g)
+		    {
 		      return new ReachedMap(g);
+		    }
 		    ///The type of the map that stores the distances of the nodes.
 		    ///The type of the map that stores the distances of the nodes.
 		    ///It must meet the \ref concepts::WriteMap "WriteMap" concept.
 		    typedef typename Digraph::template NodeMap<int> DistMap;
 		    ///Instantiates a \c DistMap.
 		    ///This function instantiates a \ref DistMap.
 		    ///\param g is the digraph, to which we would like to define the
 		    ///\ref DistMap.
 		    static DistMap *createDistMap(const Digraph &g)
+		    {
 		      return new DistMap(g);
+		    }
 		  };
 		  ///%DFS algorithm class.
 		  ///\ingroup search
 		  ///This class provides an efficient implementation of the %DFS algorithm.
 		  ///
 		  ///There is also a \ref dfs() "function-type interface" for the DFS
 		  ///algorithm, which is convenient in the simplier cases and it can be
 		  ///used easier.
 		  ///
 		  ///\tparam GR The type of the digraph the algorithm runs on.
 		  ///The default type is \ref ListDigraph.
 		#ifdef DOXYGEN
 		  template <typename GR,
 		            typename TR>
 		#else
 		  template <typename GR=ListDigraph,
 		            typename TR=DfsDefaultTraits<GR> >
 		#endif
 		  class Dfs {
 		  public:
 		    ///The type of the digraph the algorithm runs on.
 		    typedef typename TR::Digraph Digraph;
 		    ///\brief The type of the map that stores the predecessor arcs of the
 		    ///DFS paths.
 		    typedef typename TR::PredMap PredMap;
 		    ///The type of the map that stores the distances of the nodes.
 		    typedef typename TR::DistMap DistMap;
 		    ///The type of the map that indicates which nodes are reached.
 		    typedef typename TR::ReachedMap ReachedMap;
 		    ///The type of the map that indicates which nodes are processed.
 		    typedef typename TR::ProcessedMap ProcessedMap;
 		    ///The type of the paths.
 		    typedef PredMapPath<Digraph, PredMap> Path;
 		    ///The \ref DfsDefaultTraits "traits class" of the algorithm.
 		    typedef TR Traits;
 		  private:
 		    typedef typename Digraph::Node Node;
 		    typedef typename Digraph::NodeIt NodeIt;
 		    typedef typename Digraph::Arc Arc;
 		    typedef typename Digraph::OutArcIt OutArcIt;
 		    //Pointer to the underlying digraph.
 		    const Digraph *G;
 		    //Pointer to the map of predecessor arcs.
 		    PredMap *_pred;
 		    //Indicates if _pred is locally allocated (true) or not.
 		    bool local_pred;
 		    //Pointer to the map of distances.
 		    DistMap *_dist;
 		    //Indicates if _dist is locally allocated (true) or not.
 		    bool local_dist;
 		    //Pointer to the map of reached status of the nodes.
 		    ReachedMap *_reached;
 		    //Indicates if _reached is locally allocated (true) or not.
 		    bool local_reached;
 		    //Pointer to the map of processed status of the nodes.
 		    ProcessedMap *_processed;
 		    //Indicates if _processed is locally allocated (true) or not.
 		    bool local_processed;
 		    std::vector<typename Digraph::OutArcIt> _stack;
 		    int _stack_head;
 		    //Creates the maps if necessary.
 		    void create_maps()
+		    {
 		      if(!_pred) {
 		        local_pred = true;
 		        _pred = Traits::createPredMap(*G);
+		      }
 		      if(!_dist) {
 		        local_dist = true;
 		        _dist = Traits::createDistMap(*G);
+		      }
 		      if(!_reached) {
 		        local_reached = true;
 		        _reached = Traits::createReachedMap(*G);
+		      }
 		      if(!_processed) {
 		        local_processed = true;
 		        _processed = Traits::createProcessedMap(*G);
+		      }
+		    }
 		  protected:
 		    Dfs() {}
 		  public:
 		    typedef Dfs Create;
-		    ///\name Named template parameters
+		    ///\name Named Template Parameters
 		    ///@{
 		    template <class T>
 		    struct SetPredMapTraits : public Traits {
 		      typedef T PredMap;
 		      static PredMap *createPredMap(const Digraph &)
+		      {
 		        LEMON_ASSERT(false, "PredMap is not initialized");
 		        return 0; // ignore warnings
+		      }
 		    };
 		    ///\brief \ref named-templ-param "Named parameter" for setting
 		    ///\c PredMap type.
 		    ///
 		    ///\ref named-templ-param "Named parameter" for setting
 		    ///\c PredMap type.
 		    ///It must meet the \ref concepts::WriteMap "WriteMap" concept.
 		    template <class T>
 		    struct SetPredMap : public Dfs<Digraph, SetPredMapTraits<T> > {
 		      typedef Dfs<Digraph, SetPredMapTraits<T> > Create;
 		    };
 		    template <class T>
 		    struct SetDistMapTraits : public Traits {
 		      typedef T DistMap;
 		      static DistMap *createDistMap(const Digraph &)
+		      {
 		        LEMON_ASSERT(false, "DistMap is not initialized");
 		        return 0; // ignore warnings
+		      }
 		    };
 		    ///\brief \ref named-templ-param "Named parameter" for setting
 		    ///\c DistMap type.
 		    ///
 		    ///\ref named-templ-param "Named parameter" for setting
 		    ///\c DistMap type.
 		    ///It must meet the \ref concepts::WriteMap "WriteMap" concept.
 		    template <class T>
 		    struct SetDistMap : public Dfs< Digraph, SetDistMapTraits<T> > {
 		      typedef Dfs<Digraph, SetDistMapTraits<T> > Create;
 		    };
 		    template <class T>
 		    struct SetReachedMapTraits : public Traits {
 		      typedef T ReachedMap;
 		      static ReachedMap *createReachedMap(const Digraph &)
+		      {
 		        LEMON_ASSERT(false, "ReachedMap is not initialized");
 		        return 0; // ignore warnings
+		      }
 		    };
 		    ///\brief \ref named-templ-param "Named parameter" for setting
 		    ///\c ReachedMap type.
 		    ///
 		    ///\ref named-templ-param "Named parameter" for setting
 		    ///\c ReachedMap type.
 		    ///It must meet the \ref concepts::ReadWriteMap "ReadWriteMap" concept.
 		    template <class T>
 		    struct SetReachedMap : public Dfs< Digraph, SetReachedMapTraits<T> > {
 		      typedef Dfs< Digraph, SetReachedMapTraits<T> > Create;
 		    };
 		    template <class T>
 		    struct SetProcessedMapTraits : public Traits {
 		      typedef T ProcessedMap;
 		      static ProcessedMap *createProcessedMap(const Digraph &)
+		      {
 		        LEMON_ASSERT(false, "ProcessedMap is not initialized");
 		        return 0; // ignore warnings
+		      }
 		    };
 		    ///\brief \ref named-templ-param "Named parameter" for setting
 		    ///\c ProcessedMap type.
 		    ///
 		    ///\ref named-templ-param "Named parameter" for setting
 		    ///\c ProcessedMap type.
 		    ///It must meet the \ref concepts::WriteMap "WriteMap" concept.
 		    template <class T>
 		    struct SetProcessedMap : public Dfs< Digraph, SetProcessedMapTraits<T> > {
 		      typedef Dfs< Digraph, SetProcessedMapTraits<T> > Create;
 		    };
 		    struct SetStandardProcessedMapTraits : public Traits {
 		      typedef typename Digraph::template NodeMap<bool> ProcessedMap;
 		      static ProcessedMap *createProcessedMap(const Digraph &g)
+		      {
 		        return new ProcessedMap(g);
+		      }
 		    };
 		    ///\brief \ref named-templ-param "Named parameter" for setting
 		    ///\c ProcessedMap type to be <tt>Digraph::NodeMap<bool></tt>.
 		    ///
 		    ///\ref named-templ-param "Named parameter" for setting
 		    ///\c ProcessedMap type to be <tt>Digraph::NodeMap<bool></tt>.
 		    ///If you don't set it explicitly, it will be automatically allocated.
 		    struct SetStandardProcessedMap :
 		      public Dfs< Digraph, SetStandardProcessedMapTraits > {
 		      typedef Dfs< Digraph, SetStandardProcessedMapTraits > Create;
 		    };
 		    ///@}
 		  public:
 		    ///Constructor.
 		    ///Constructor.
 		    ///\param g The digraph the algorithm runs on.
 		    Dfs(const Digraph &g) :
 		      G(&g),
 		      _pred(NULL), local_pred(false),
 		      _dist(NULL), local_dist(false),
 		      _reached(NULL), local_reached(false),
 		      _processed(NULL), local_processed(false)
 		    { }
 		    ///Destructor.
 		    ~Dfs()
+		    {
 		      if(local_pred) delete _pred;
 		      if(local_dist) delete _dist;
 		      if(local_reached) delete _reached;
 		      if(local_processed) delete _processed;
+		    }
 		    ///Sets the map that stores the predecessor arcs.
 		    ///Sets the map that stores the predecessor arcs.
 		    ///If you don't use this function before calling \ref run(Node) "run()"
 		    ///or \ref init(), an instance will be allocated automatically.
 		    ///The destructor deallocates this automatically allocated map,
 		    ///of course.
 		    ///\return <tt> (*this) </tt>
 		    Dfs &predMap(PredMap &m)
+		    {
 		      if(local_pred) {
 		        delete _pred;
 		        local_pred=false;
+		      }
 		      _pred = &m;
 		      return *this;
+		    }
 		    ///Sets the map that indicates which nodes are reached.
 		    ///Sets the map that indicates which nodes are reached.
 		    ///If you don't use this function before calling \ref run(Node) "run()"
 		    ///or \ref init(), an instance will be allocated automatically.
 		    ///The destructor deallocates this automatically allocated map,
 		    ///of course.
 		    ///\return <tt> (*this) </tt>
 		    Dfs &reachedMap(ReachedMap &m)
+		    {
 		      if(local_reached) {
 		        delete _reached;
 		        local_reached=false;
+		      }
 		      _reached = &m;
 		      return *this;
+		    }
 		    ///Sets the map that indicates which nodes are processed.
 		    ///Sets the map that indicates which nodes are processed.
 		    ///If you don't use this function before calling \ref run(Node) "run()"
 		    ///or \ref init(), an instance will be allocated automatically.
 		    ///The destructor deallocates this automatically allocated map,
 		    ///of course.
 		    ///\return <tt> (*this) </tt>
 		    Dfs &processedMap(ProcessedMap &m)
+		    {
 		      if(local_processed) {
 		        delete _processed;
 		        local_processed=false;
+		      }
 		      _processed = &m;
 		      return *this;
+		    }
 		    ///Sets the map that stores the distances of the nodes.
 		    ///Sets the map that stores the distances of the nodes calculated by
 		    ///the algorithm.
 		    ///If you don't use this function before calling \ref run(Node) "run()"
 		    ///or \ref init(), an instance will be allocated automatically.
 		    ///The destructor deallocates this automatically allocated map,
 		    ///of course.
 		    ///\return <tt> (*this) </tt>
 		    Dfs &distMap(DistMap &m)
+		    {
 		      if(local_dist) {
 		        delete _dist;
 		        local_dist=false;
+		      }
 		      _dist = &m;
 		      return *this;
+		    }
 		  public:
 		    ///\name Execution Control
 		    ///The simplest way to execute the DFS algorithm is to use one of the
 		    ///member functions called \ref run(Node) "run()".\n
 		    ///If you need more control on the execution, first you have to call
 		    ///\ref init(), then you can add a source node with \ref addSource()
 		    ///and perform the actual computation with \ref start().
 		    ///This procedure can be repeated if there are nodes that have not
 		    ///been reached.
 		    ///@{
 		    ///\brief Initializes the internal data structures.
 		    ///
 		    ///Initializes the internal data structures.
 		    void init()
+		    {
 		      create_maps();
 		      _stack.resize(countNodes(*G));
 		      _stack_head=-1;
 		      for ( NodeIt u(*G) ; u!=INVALID ; ++u ) {
 		        _pred->set(u,INVALID);
 		        _reached->set(u,false);
 		        _processed->set(u,false);
+		      }
+		    }
 		    ///Adds a new source node.
 		    ///Adds a new source node to the set of nodes to be processed.
 		    ///
 		    ///\pre The stack must be empty. Otherwise the algorithm gives
 		    ///wrong results. (One of the outgoing arcs of all the source nodes
 		    ///except for the last one will not be visited and distances will
 		    ///also be wrong.)
 		    void addSource(Node s)
+		    {
 		      LEMON_DEBUG(emptyQueue(), "The stack is not empty.");
 		      if(!(*_reached)[s])
+		        {
 		          _reached->set(s,true);
 		          _pred->set(s,INVALID);
 		          OutArcIt e(*G,s);
 		          if(e!=INVALID) {
 		            _stack[++_stack_head]=e;
 		            _dist->set(s,_stack_head);
+		          }
 		          else {
 		            _processed->set(s,true);
 		            _dist->set(s,0);
+		          }
+		        }
+		    }
 		    ///Processes the next arc.

lemon/dijkstra.h

Show inline comments

@@ -33,513 +33,513 @@
 		#include <lemon/path.h>
 		namespace lemon {
 		  /// \brief Default operation traits for the Dijkstra algorithm class.
 		  ///
 		  /// This operation traits class defines all computational operations and
 		  /// constants which are used in the Dijkstra algorithm.
 		  template <typename V>
 		  struct DijkstraDefaultOperationTraits {
 		    /// \e
 		    typedef V Value;
 		    /// \brief Gives back the zero value of the type.
 		    static Value zero() {
 		      return static_cast<Value>(0);
+		    }
 		    /// \brief Gives back the sum of the given two elements.
 		    static Value plus(const Value& left, const Value& right) {
 		      return left + right;
+		    }
 		    /// \brief Gives back true only if the first value is less than the second.
 		    static bool less(const Value& left, const Value& right) {
 		      return left < right;
+		    }
 		  };
 		  ///Default traits class of Dijkstra class.
 		  ///Default traits class of Dijkstra class.
 		  ///\tparam GR The type of the digraph.
 		  ///\tparam LEN The type of the length map.
 		  template<typename GR, typename LEN>
 		  struct DijkstraDefaultTraits
+		  {
 		    ///The type of the digraph the algorithm runs on.
 		    typedef GR Digraph;
 		    ///The type of the map that stores the arc lengths.
 		    ///The type of the map that stores the arc lengths.
 		    ///It must meet the \ref concepts::ReadMap "ReadMap" concept.
 		    typedef LEN LengthMap;
 		    ///The type of the length of the arcs.
 		    typedef typename LEN::Value Value;
 		    /// Operation traits for %Dijkstra algorithm.
 		    /// This class defines the operations that are used in the algorithm.
 		    /// \see DijkstraDefaultOperationTraits
 		    typedef DijkstraDefaultOperationTraits<Value> OperationTraits;
 		    /// The cross reference type used by the heap.
 		    /// The cross reference type used by the heap.
 		    /// Usually it is \c Digraph::NodeMap<int>.
 		    typedef typename Digraph::template NodeMap<int> HeapCrossRef;
 		    ///Instantiates a \c HeapCrossRef.
 		    ///This function instantiates a \ref HeapCrossRef.
 		    /// \param g is the digraph, to which we would like to define the
 		    /// \ref HeapCrossRef.
 		    static HeapCrossRef *createHeapCrossRef(const Digraph &g)
+		    {
 		      return new HeapCrossRef(g);
+		    }
 		    ///The heap type used by the %Dijkstra algorithm.
 		    ///The heap type used by the Dijkstra algorithm.
 		    ///
 		    ///\sa BinHeap
 		    ///\sa Dijkstra
 		    typedef BinHeap<typename LEN::Value, HeapCrossRef, std::less<Value> > Heap;
 		    ///Instantiates a \c Heap.
 		    ///This function instantiates a \ref Heap.
 		    static Heap *createHeap(HeapCrossRef& r)
+		    {
 		      return new Heap(r);
+		    }
 		    ///\brief The type of the map that stores the predecessor
 		    ///arcs of the shortest paths.
 		    ///
 		    ///The type of the map that stores the predecessor
 		    ///arcs of the shortest paths.
 		    ///It must meet the \ref concepts::WriteMap "WriteMap" concept.
 		    typedef typename Digraph::template NodeMap<typename Digraph::Arc> PredMap;
 		    ///Instantiates a \c PredMap.
 		    ///This function instantiates a \ref PredMap.
 		    ///\param g is the digraph, to which we would like to define the
 		    ///\ref PredMap.
 		    static PredMap *createPredMap(const Digraph &g)
+		    {
 		      return new PredMap(g);
+		    }
 		    ///The type of the map that indicates which nodes are processed.
 		    ///The type of the map that indicates which nodes are processed.
 		    ///It must meet the \ref concepts::WriteMap "WriteMap" concept.
 		    ///By default it is a NullMap.
 		    typedef NullMap<typename Digraph::Node,bool> ProcessedMap;
 		    ///Instantiates a \c ProcessedMap.
 		    ///This function instantiates a \ref ProcessedMap.
 		    ///\param g is the digraph, to which
 		    ///we would like to define the \ref ProcessedMap.
 		#ifdef DOXYGEN
 		    static ProcessedMap *createProcessedMap(const Digraph &g)
 		#else
 		    static ProcessedMap *createProcessedMap(const Digraph &)
 		#endif
+		    {
 		      return new ProcessedMap();
+		    }
 		    ///The type of the map that stores the distances of the nodes.
 		    ///The type of the map that stores the distances of the nodes.
 		    ///It must meet the \ref concepts::WriteMap "WriteMap" concept.
 		    typedef typename Digraph::template NodeMap<typename LEN::Value> DistMap;
 		    ///Instantiates a \c DistMap.
 		    ///This function instantiates a \ref DistMap.
 		    ///\param g is the digraph, to which we would like to define
 		    ///the \ref DistMap.
 		    static DistMap *createDistMap(const Digraph &g)
+		    {
 		      return new DistMap(g);
+		    }
 		  };
 		  ///%Dijkstra algorithm class.
 		  /// \ingroup shortest_path
 		  ///This class provides an efficient implementation of the %Dijkstra algorithm.
 		  ///
 		  ///The arc lengths are passed to the algorithm using a
 		  ///\ref concepts::ReadMap "ReadMap",
 		  ///so it is easy to change it to any kind of length.
 		  ///The type of the length is determined by the
 		  ///\ref concepts::ReadMap::Value "Value" of the length map.
 		  ///It is also possible to change the underlying priority heap.
 		  ///
 		  ///There is also a \ref dijkstra() "function-type interface" for the
 		  ///%Dijkstra algorithm, which is convenient in the simplier cases and
 		  ///it can be used easier.
 		  ///
 		  ///\tparam GR The type of the digraph the algorithm runs on.
 		  ///The default type is \ref ListDigraph.
 		  ///\tparam LEN A \ref concepts::ReadMap "readable" arc map that specifies
 		  ///the lengths of the arcs.
 		  ///It is read once for each arc, so the map may involve in
 		  ///relatively time consuming process to compute the arc lengths if
 		  ///it is necessary. The default map type is \ref
 		  ///concepts::Digraph::ArcMap "GR::ArcMap<int>".
 		#ifdef DOXYGEN
 		  template <typename GR, typename LEN, typename TR>
 		#else
 		  template <typename GR=ListDigraph,
 		            typename LEN=typename GR::template ArcMap<int>,
 		            typename TR=DijkstraDefaultTraits<GR,LEN> >
 		#endif
 		  class Dijkstra {
 		  public:
 		    ///The type of the digraph the algorithm runs on.
 		    typedef typename TR::Digraph Digraph;
 		    ///The type of the length of the arcs.
 		    typedef typename TR::LengthMap::Value Value;
 		    ///The type of the map that stores the arc lengths.
 		    typedef typename TR::LengthMap LengthMap;
 		    ///\brief The type of the map that stores the predecessor arcs of the
 		    ///shortest paths.
 		    typedef typename TR::PredMap PredMap;
 		    ///The type of the map that stores the distances of the nodes.
 		    typedef typename TR::DistMap DistMap;
 		    ///The type of the map that indicates which nodes are processed.
 		    typedef typename TR::ProcessedMap ProcessedMap;
 		    ///The type of the paths.
 		    typedef PredMapPath<Digraph, PredMap> Path;
 		    ///The cross reference type used for the current heap.
 		    typedef typename TR::HeapCrossRef HeapCrossRef;
 		    ///The heap type used by the algorithm.
 		    typedef typename TR::Heap Heap;
 		    ///\brief The \ref DijkstraDefaultOperationTraits "operation traits class"
 		    ///of the algorithm.
 		    typedef typename TR::OperationTraits OperationTraits;
 		    ///The \ref DijkstraDefaultTraits "traits class" of the algorithm.
 		    typedef TR Traits;
 		  private:
 		    typedef typename Digraph::Node Node;
 		    typedef typename Digraph::NodeIt NodeIt;
 		    typedef typename Digraph::Arc Arc;
 		    typedef typename Digraph::OutArcIt OutArcIt;
 		    //Pointer to the underlying digraph.
 		    const Digraph *G;
 		    //Pointer to the length map.
 		    const LengthMap *_length;
 		    //Pointer to the map of predecessors arcs.
 		    PredMap *_pred;
 		    //Indicates if _pred is locally allocated (true) or not.
 		    bool local_pred;
 		    //Pointer to the map of distances.
 		    DistMap *_dist;
 		    //Indicates if _dist is locally allocated (true) or not.
 		    bool local_dist;
 		    //Pointer to the map of processed status of the nodes.
 		    ProcessedMap *_processed;
 		    //Indicates if _processed is locally allocated (true) or not.
 		    bool local_processed;
 		    //Pointer to the heap cross references.
 		    HeapCrossRef *_heap_cross_ref;
 		    //Indicates if _heap_cross_ref is locally allocated (true) or not.
 		    bool local_heap_cross_ref;
 		    //Pointer to the heap.
 		    Heap *_heap;
 		    //Indicates if _heap is locally allocated (true) or not.
 		    bool local_heap;
 		    //Creates the maps if necessary.
 		    void create_maps()
+		    {
 		      if(!_pred) {
 		        local_pred = true;
 		        _pred = Traits::createPredMap(*G);
+		      }
 		      if(!_dist) {
 		        local_dist = true;
 		        _dist = Traits::createDistMap(*G);
+		      }
 		      if(!_processed) {
 		        local_processed = true;
 		        _processed = Traits::createProcessedMap(*G);
+		      }
 		      if (!_heap_cross_ref) {
 		        local_heap_cross_ref = true;
 		        _heap_cross_ref = Traits::createHeapCrossRef(*G);
+		      }
 		      if (!_heap) {
 		        local_heap = true;
 		        _heap = Traits::createHeap(*_heap_cross_ref);
+		      }
+		    }
 		  public:
 		    typedef Dijkstra Create;
-		    ///\name Named template parameters
+		    ///\name Named Template Parameters
 		    ///@{
 		    template <class T>
 		    struct SetPredMapTraits : public Traits {
 		      typedef T PredMap;
 		      static PredMap *createPredMap(const Digraph &)
+		      {
 		        LEMON_ASSERT(false, "PredMap is not initialized");
 		        return 0; // ignore warnings
+		      }
 		    };
 		    ///\brief \ref named-templ-param "Named parameter" for setting
 		    ///\c PredMap type.
 		    ///
 		    ///\ref named-templ-param "Named parameter" for setting
 		    ///\c PredMap type.
 		    ///It must meet the \ref concepts::WriteMap "WriteMap" concept.
 		    template <class T>
 		    struct SetPredMap
 		      : public Dijkstra< Digraph, LengthMap, SetPredMapTraits<T> > {
 		      typedef Dijkstra< Digraph, LengthMap, SetPredMapTraits<T> > Create;
 		    };
 		    template <class T>
 		    struct SetDistMapTraits : public Traits {
 		      typedef T DistMap;
 		      static DistMap *createDistMap(const Digraph &)
+		      {
 		        LEMON_ASSERT(false, "DistMap is not initialized");
 		        return 0; // ignore warnings
+		      }
 		    };
 		    ///\brief \ref named-templ-param "Named parameter" for setting
 		    ///\c DistMap type.
 		    ///
 		    ///\ref named-templ-param "Named parameter" for setting
 		    ///\c DistMap type.
 		    ///It must meet the \ref concepts::WriteMap "WriteMap" concept.
 		    template <class T>
 		    struct SetDistMap
 		      : public Dijkstra< Digraph, LengthMap, SetDistMapTraits<T> > {
 		      typedef Dijkstra< Digraph, LengthMap, SetDistMapTraits<T> > Create;
 		    };
 		    template <class T>
 		    struct SetProcessedMapTraits : public Traits {
 		      typedef T ProcessedMap;
 		      static ProcessedMap *createProcessedMap(const Digraph &)
+		      {
 		        LEMON_ASSERT(false, "ProcessedMap is not initialized");
 		        return 0; // ignore warnings
+		      }
 		    };
 		    ///\brief \ref named-templ-param "Named parameter" for setting
 		    ///\c ProcessedMap type.
 		    ///
 		    ///\ref named-templ-param "Named parameter" for setting
 		    ///\c ProcessedMap type.
 		    ///It must meet the \ref concepts::WriteMap "WriteMap" concept.
 		    template <class T>
 		    struct SetProcessedMap
 		      : public Dijkstra< Digraph, LengthMap, SetProcessedMapTraits<T> > {
 		      typedef Dijkstra< Digraph, LengthMap, SetProcessedMapTraits<T> > Create;
 		    };
 		    struct SetStandardProcessedMapTraits : public Traits {
 		      typedef typename Digraph::template NodeMap<bool> ProcessedMap;
 		      static ProcessedMap *createProcessedMap(const Digraph &g)
+		      {
 		        return new ProcessedMap(g);
+		      }
 		    };
 		    ///\brief \ref named-templ-param "Named parameter" for setting
 		    ///\c ProcessedMap type to be <tt>Digraph::NodeMap<bool></tt>.
 		    ///
 		    ///\ref named-templ-param "Named parameter" for setting
 		    ///\c ProcessedMap type to be <tt>Digraph::NodeMap<bool></tt>.
 		    ///If you don't set it explicitly, it will be automatically allocated.
 		    struct SetStandardProcessedMap
 		      : public Dijkstra< Digraph, LengthMap, SetStandardProcessedMapTraits > {
 		      typedef Dijkstra< Digraph, LengthMap, SetStandardProcessedMapTraits >
 		      Create;
 		    };
 		    template <class H, class CR>
 		    struct SetHeapTraits : public Traits {
 		      typedef CR HeapCrossRef;
 		      typedef H Heap;
 		      static HeapCrossRef *createHeapCrossRef(const Digraph &) {
 		        LEMON_ASSERT(false, "HeapCrossRef is not initialized");
 		        return 0; // ignore warnings
+		      }
 		      static Heap *createHeap(HeapCrossRef &)
+		      {
 		        LEMON_ASSERT(false, "Heap is not initialized");
 		        return 0; // ignore warnings
+		      }
 		    };
 		    ///\brief \ref named-templ-param "Named parameter" for setting
 		    ///heap and cross reference types
 		    ///
 		    ///\ref named-templ-param "Named parameter" for setting heap and cross
 		    ///reference types. If this named parameter is used, then external
 		    ///heap and cross reference objects must be passed to the algorithm
 		    ///using the \ref heap() function before calling \ref run(Node) "run()"
 		    ///or \ref init().
 		    ///\sa SetStandardHeap
 		    template <class H, class CR = typename Digraph::template NodeMap<int> >
 		    struct SetHeap
 		      : public Dijkstra< Digraph, LengthMap, SetHeapTraits<H, CR> > {
 		      typedef Dijkstra< Digraph, LengthMap, SetHeapTraits<H, CR> > Create;
 		    };
 		    template <class H, class CR>
 		    struct SetStandardHeapTraits : public Traits {
 		      typedef CR HeapCrossRef;
 		      typedef H Heap;
 		      static HeapCrossRef *createHeapCrossRef(const Digraph &G) {
 		        return new HeapCrossRef(G);
+		      }
 		      static Heap *createHeap(HeapCrossRef &R)
+		      {
 		        return new Heap(R);
+		      }
 		    };
 		    ///\brief \ref named-templ-param "Named parameter" for setting
 		    ///heap and cross reference types with automatic allocation
 		    ///
 		    ///\ref named-templ-param "Named parameter" for setting heap and cross
 		    ///reference types with automatic allocation.
 		    ///They should have standard constructor interfaces to be able to
 		    ///automatically created by the algorithm (i.e. the digraph should be
 		    ///passed to the constructor of the cross reference and the cross
 		    ///reference should be passed to the constructor of the heap).
 		    ///However external heap and cross reference objects could also be
 		    ///passed to the algorithm using the \ref heap() function before
 		    ///calling \ref run(Node) "run()" or \ref init().
 		    ///\sa SetHeap
 		    template <class H, class CR = typename Digraph::template NodeMap<int> >
 		    struct SetStandardHeap
 		      : public Dijkstra< Digraph, LengthMap, SetStandardHeapTraits<H, CR> > {
 		      typedef Dijkstra< Digraph, LengthMap, SetStandardHeapTraits<H, CR> >
 		      Create;
 		    };
 		    template <class T>
 		    struct SetOperationTraitsTraits : public Traits {
 		      typedef T OperationTraits;
 		    };
 		    /// \brief \ref named-templ-param "Named parameter" for setting
 		    ///\c OperationTraits type
 		    ///
 		    ///\ref named-templ-param "Named parameter" for setting
 		    ///\c OperationTraits type.
 		    template <class T>
 		    struct SetOperationTraits
 		      : public Dijkstra<Digraph, LengthMap, SetOperationTraitsTraits<T> > {
 		      typedef Dijkstra<Digraph, LengthMap, SetOperationTraitsTraits<T> >
 		      Create;
 		    };
 		    ///@}
 		  protected:
 		    Dijkstra() {}
 		  public:
 		    ///Constructor.
 		    ///Constructor.
 		    ///\param g The digraph the algorithm runs on.
 		    ///\param length The length map used by the algorithm.
 		    Dijkstra(const Digraph& g, const LengthMap& length) :
 		      G(&g), _length(&length),
 		      _pred(NULL), local_pred(false),
 		      _dist(NULL), local_dist(false),
 		      _processed(NULL), local_processed(false),
 		      _heap_cross_ref(NULL), local_heap_cross_ref(false),
 		      _heap(NULL), local_heap(false)
 		    { }
 		    ///Destructor.
 		    ~Dijkstra()
+		    {
 		      if(local_pred) delete _pred;
 		      if(local_dist) delete _dist;
 		      if(local_processed) delete _processed;
 		      if(local_heap_cross_ref) delete _heap_cross_ref;
 		      if(local_heap) delete _heap;
+		    }
 		    ///Sets the length map.
 		    ///Sets the length map.
 		    ///\return <tt> (*this) </tt>
 		    Dijkstra &lengthMap(const LengthMap &m)
+		    {
 		      _length = &m;
 		      return *this;
+		    }
 		    ///Sets the map that stores the predecessor arcs.
 		    ///Sets the map that stores the predecessor arcs.
 		    ///If you don't use this function before calling \ref run(Node) "run()"
 		    ///or \ref init(), an instance will be allocated automatically.
 		    ///The destructor deallocates this automatically allocated map,
 		    ///of course.
 		    ///\return <tt> (*this) </tt>
 		    Dijkstra &predMap(PredMap &m)
+		    {
 		      if(local_pred) {
 		        delete _pred;
 		        local_pred=false;
+		      }
 		      _pred = &m;
 		      return *this;
+		    }
 		    ///Sets the map that indicates which nodes are processed.
 		    ///Sets the map that indicates which nodes are processed.
 		    ///If you don't use this function before calling \ref run(Node) "run()"
 		    ///or \ref init(), an instance will be allocated automatically.
 		    ///The destructor deallocates this automatically allocated map,
 		    ///of course.
 		    ///\return <tt> (*this) </tt>
 		    Dijkstra &processedMap(ProcessedMap &m)
+		    {
 		      if(local_processed) {
 		        delete _processed;
 		        local_processed=false;
+		      }
 		      _processed = &m;
 		      return *this;
+		    }
 		    ///Sets the map that stores the distances of the nodes.
 		    ///Sets the map that stores the distances of the nodes calculated by the
 		    ///algorithm.
 		    ///If you don't use this function before calling \ref run(Node) "run()"
 		    ///or \ref init(), an instance will be allocated automatically.
 		    ///The destructor deallocates this automatically allocated map,
 		    ///of course.
 		    ///\return <tt> (*this) </tt>
 		    Dijkstra &distMap(DistMap &m)
+		    {
 		      if(local_dist) {
 		        delete _dist;
 		        local_dist=false;
+		      }

lemon/dimacs.h

Show inline comments

 		/* -*- mode: C++; indent-tabs-mode: nil; -*-
+		 *
 		 * This file is a part of LEMON, a generic C++ optimization library.
+		 *
 		 * Copyright (C) 2003-2009
 		 * 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_DIMACS_H
 		#define LEMON_DIMACS_H
 		#include <iostream>
 		#include <string>
 		#include <vector>
 		#include <limits>
 		#include <lemon/maps.h>
 		#include <lemon/error.h>
 		/// \ingroup dimacs_group
 		/// \file
 		/// \brief DIMACS file format reader.
 		namespace lemon {
 		  /// \addtogroup dimacs_group
 		  /// @{
 		  /// DIMACS file type descriptor.
 		  struct DimacsDescriptor
+		  {
 		    ///File type enum
 		    enum Type
+		      {
 		        NONE, MIN, MAX, SP, MAT
 		    ///\brief DIMACS file type enum
 		    ///
 		    ///DIMACS file type enum.
 		    enum Type {
 		      NONE,  ///< Undefined type.
 		      MIN,   ///< DIMACS file type for minimum cost flow problems.
 		      MAX,   ///< DIMACS file type for maximum flow problems.
 		      SP,    ///< DIMACS file type for shostest path problems.
 		      MAT    ///< DIMACS file type for plain graphs and matching problems.
 		      };
 		    ///The file type
 		    Type type;
 		    ///The number of nodes in the graph
 		    int nodeNum;
 		    ///The number of edges in the graph
 		    int edgeNum;
 		    int lineShift;
-		    /// Constructor. Sets the type to NONE.
+		    ///Constructor. It sets the type to \c NONE.
 		    DimacsDescriptor() : type(NONE) {}
 		  };
 		  ///Discover the type of a DIMACS file
 		  ///It starts seeking the beginning of the file for the problem type
 		  ///and size info. The found data is returned in a special struct
 		  ///that can be evaluated and passed to the appropriate reader
 		  ///function.
 		  ///This function starts seeking the beginning of the given file for the
 		  ///problem type and size info.
 		  ///The found data is returned in a special struct that can be evaluated
 		  ///and passed to the appropriate reader function.
 		  DimacsDescriptor dimacsType(std::istream& is)
+		  {
 		    DimacsDescriptor r;
 		    std::string problem,str;
 		    char c;
 		    r.lineShift=0;
 		    while (is >> c)
 		      switch(c)
+		        {
 		        case 'p':
 		          if(is >> problem >> r.nodeNum >> r.edgeNum)
+		            {
 		              getline(is, str);
 		              r.lineShift++;
 		              if(problem=="min") r.type=DimacsDescriptor::MIN;
 		              else if(problem=="max") r.type=DimacsDescriptor::MAX;
 		              else if(problem=="sp") r.type=DimacsDescriptor::SP;
 		              else if(problem=="mat") r.type=DimacsDescriptor::MAT;
 		              else throw FormatError("Unknown problem type");
 		              return r;
+		            }
 		          else
+		            {
 		              throw FormatError("Missing or wrong problem type declaration.");
+		            }
 		          break;
 		        case 'c':
 		          getline(is, str);
 		          r.lineShift++;
 		          break;
 		        default:
 		          throw FormatError("Unknown DIMACS declaration.");
+		        }
 		    throw FormatError("Missing problem type declaration.");
+		  }
 		  /// DIMACS minimum cost flow reader function.
 		  /// \brief DIMACS minimum cost flow reader function.
 		  ///
 		  /// This function reads a minimum cost flow instance from DIMACS format,
 		  /// i.e. from a DIMACS file having a line starting with
 		  /// \code
 		  ///   p min
 		  /// \endcode
 		  /// At the beginning, \c g is cleared by \c g.clear(). The supply
 		  /// amount of the nodes are written to the \c supply node map
 		  /// (they are signed values). The lower bounds, capacities and costs
 		  /// of the arcs are written to the \c lower, \c capacity and \c cost
 		  /// arc maps.
 		  ///
 		  /// If the capacity of an arc is less than the lower bound, it will
 		  /// be set to "infinite" instead. The actual value of "infinite" is
 		  /// contolled by the \c infty parameter. If it is 0 (the default value),
 		  /// \c std::numeric_limits<Capacity>::infinity() will be used if available,
 		  /// \c std::numeric_limits<Capacity>::max() otherwise. If \c infty is set to
 		  /// a non-zero value, that value will be used as "infinite".
 		  ///
 		  /// If the file type was previously evaluated by dimacsType(), then
 		  /// the descriptor struct should be given by the \c dest parameter.
 		  template <typename Digraph, typename LowerMap,
 		            typename CapacityMap, typename CostMap,
 		            typename SupplyMap>
 		  void readDimacsMin(std::istream& is,
 		                     Digraph &g,
 		                     LowerMap& lower,
 		                     CapacityMap& capacity,
 		                     CostMap& cost,
 		                     SupplyMap& supply,
 		                     typename CapacityMap::Value infty = 0,
 		                     DimacsDescriptor desc=DimacsDescriptor())
+		  {
 		    g.clear();
 		    std::vector<typename Digraph::Node> nodes;
 		    typename Digraph::Arc e;
 		    std::string problem, str;
 		    char c;
 		    int i, j;
 		    if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is);
 		    if(desc.type!=DimacsDescriptor::MIN)
 		      throw FormatError("Problem type mismatch");
 		    nodes.resize(desc.nodeNum + 1);
 		    for (int k = 1; k <= desc.nodeNum; ++k) {
 		      nodes[k] = g.addNode();
 		      supply.set(nodes[k], 0);
+		    }
 		    typename SupplyMap::Value sup;
 		    typename CapacityMap::Value low;
 		    typename CapacityMap::Value cap;
 		    typename CostMap::Value co;
 		    typedef typename CapacityMap::Value Capacity;
 		    if(infty==0)
 		      infty = std::numeric_limits<Capacity>::has_infinity ?
 		        std::numeric_limits<Capacity>::infinity() :
 		        std::numeric_limits<Capacity>::max();
 		    while (is >> c) {
 		      switch (c) {
 		      case 'c': // comment line
 		        getline(is, str);
 		        break;
 		      case 'n': // node definition line
 		        is >> i >> sup;
 		        getline(is, str);
 		        supply.set(nodes[i], sup);
 		        break;
 		      case 'a': // arc definition line
 		        is >> i >> j >> low >> cap >> co;
 		        getline(is, str);
 		        e = g.addArc(nodes[i], nodes[j]);
 		        lower.set(e, low);
 		        if (cap >= low)
 		          capacity.set(e, cap);
 		        else
 		          capacity.set(e, infty);
 		        cost.set(e, co);
 		        break;
+		      }
+		    }
+		  }
 		  template<typename Digraph, typename CapacityMap>
 		  void _readDimacs(std::istream& is,
 		                   Digraph &g,
 		                   CapacityMap& capacity,
 		                   typename Digraph::Node &s,
 		                   typename Digraph::Node &t,
 		                   typename CapacityMap::Value infty = 0,
 		                   DimacsDescriptor desc=DimacsDescriptor()) {
 		    g.clear();
 		    s=t=INVALID;
 		    std::vector<typename Digraph::Node> nodes;
 		    typename Digraph::Arc e;
 		    char c, d;
 		    int i, j;
 		    typename CapacityMap::Value _cap;
 		    std::string str;
 		    nodes.resize(desc.nodeNum + 1);
 		    for (int k = 1; k <= desc.nodeNum; ++k) {
 		      nodes[k] = g.addNode();
+		    }
 		    typedef typename CapacityMap::Value Capacity;
 		    if(infty==0)
 		      infty = std::numeric_limits<Capacity>::has_infinity ?
 		        std::numeric_limits<Capacity>::infinity() :
 		        std::numeric_limits<Capacity>::max();
 		    while (is >> c) {
 		      switch (c) {
 		      case 'c': // comment line
 		        getline(is, str);
 		        break;
 		      case 'n': // node definition line
 		        if (desc.type==DimacsDescriptor::SP) { // shortest path problem
 		          is >> i;
 		          getline(is, str);
 		          s = nodes[i];
+		        }
 		        if (desc.type==DimacsDescriptor::MAX) { // max flow problem
 		          is >> i >> d;
 		          getline(is, str);
 		          if (d == 's') s = nodes[i];
 		          if (d == 't') t = nodes[i];
+		        }
 		        break;
 		      case 'a': // arc definition line
 		        if (desc.type==DimacsDescriptor::SP) {
 		          is >> i >> j >> _cap;
 		          getline(is, str);
 		          e = g.addArc(nodes[i], nodes[j]);
 		          capacity.set(e, _cap);
+		        }
 		        else if (desc.type==DimacsDescriptor::MAX) {
 		          is >> i >> j >> _cap;
 		          getline(is, str);
 		          e = g.addArc(nodes[i], nodes[j]);
 		          if (_cap >= 0)
 		            capacity.set(e, _cap);
 		          else
 		            capacity.set(e, infty);
+		        }
 		        else {
 		          is >> i >> j;
 		          getline(is, str);
 		          g.addArc(nodes[i], nodes[j]);
+		        }
 		        break;
+		      }
+		    }
+		  }
 		  /// DIMACS maximum flow reader function.
+		  /// \brief DIMACS maximum flow reader function.
 		  ///
 		  /// This function reads a maximum flow instance from DIMACS format,
 		  /// i.e. from a DIMACS file having a line starting with
 		  /// \code
 		  ///   p max
 		  /// \endcode
 		  /// At the beginning, \c g is cleared by \c g.clear(). The arc
 		  /// capacities are written to the \c capacity arc map and \c s and
 		  /// \c t are set to the source and the target nodes.
 		  ///
 		  /// If the capacity of an arc is negative, it will
 		  /// be set to "infinite" instead. The actual value of "infinite" is
 		  /// contolled by the \c infty parameter. If it is 0 (the default value),
 		  /// \c std::numeric_limits<Capacity>::infinity() will be used if available,
 		  /// \c std::numeric_limits<Capacity>::max() otherwise. If \c infty is set to
 		  /// a non-zero value, that value will be used as "infinite".
 		  ///
 		  /// If the file type was previously evaluated by dimacsType(), then
 		  /// the descriptor struct should be given by the \c dest parameter.
 		  template<typename Digraph, typename CapacityMap>
 		  void readDimacsMax(std::istream& is,
 		                     Digraph &g,
 		                     CapacityMap& capacity,
 		                     typename Digraph::Node &s,
 		                     typename Digraph::Node &t,
 		                     typename CapacityMap::Value infty = 0,
 		                     DimacsDescriptor desc=DimacsDescriptor()) {
 		    if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is);
 		    if(desc.type!=DimacsDescriptor::MAX)
 		      throw FormatError("Problem type mismatch");
 		    _readDimacs(is,g,capacity,s,t,infty,desc);
+		  }
 		  /// DIMACS shortest path reader function.
+		  /// \brief DIMACS shortest path reader function.
 		  ///
 		  /// This function reads a shortest path instance from DIMACS format,
 		  /// i.e. from a DIMACS file having a line starting with
 		  /// \code
 		  ///   p sp
 		  /// \endcode
 		  /// At the beginning, \c g is cleared by \c g.clear(). The arc
 		  /// lengths are written to the \c length arc map and \c s is set to the
 		  /// source node.
 		  ///
 		  /// If the file type was previously evaluated by dimacsType(), then
 		  /// the descriptor struct should be given by the \c dest parameter.
 		  template<typename Digraph, typename LengthMap>
 		  void readDimacsSp(std::istream& is,
 		                    Digraph &g,
 		                    LengthMap& length,
 		                    typename Digraph::Node &s,
 		                    DimacsDescriptor desc=DimacsDescriptor()) {
 		    typename Digraph::Node t;
 		    if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is);
 		    if(desc.type!=DimacsDescriptor::SP)
 		      throw FormatError("Problem type mismatch");
 		    _readDimacs(is, g, length, s, t, 0, desc);
+		  }
 		  /// DIMACS capacitated digraph reader function.
+		  /// \brief DIMACS capacitated digraph reader function.
 		  ///
 		  /// This function reads an arc capacitated digraph instance from
 		  /// DIMACS 'max' or 'sp' format.
 		  /// At the beginning, \c g is cleared by \c g.clear()
 		  /// and the arc capacities/lengths are written to the \c capacity
 		  /// arc map.
 		  ///
 		  /// In case of the 'max' format, if the capacity of an arc is negative,
 		  /// it will
 		  /// be set to "infinite" instead. The actual value of "infinite" is
 		  /// contolled by the \c infty parameter. If it is 0 (the default value),
 		  /// \c std::numeric_limits<Capacity>::infinity() will be used if available,
 		  /// \c std::numeric_limits<Capacity>::max() otherwise. If \c infty is set to
 		  /// a non-zero value, that value will be used as "infinite".
 		  ///
 		  /// If the file type was previously evaluated by dimacsType(), then
 		  /// the descriptor struct should be given by the \c dest parameter.
 		  template<typename Digraph, typename CapacityMap>
 		  void readDimacsCap(std::istream& is,
 		                     Digraph &g,
 		                     CapacityMap& capacity,
 		                     typename CapacityMap::Value infty = 0,
 		                     DimacsDescriptor desc=DimacsDescriptor()) {
 		    typename Digraph::Node u,v;
 		    if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is);
 		    if(desc.type!=DimacsDescriptor::MAX || desc.type!=DimacsDescriptor::SP)
 		      throw FormatError("Problem type mismatch");
 		    _readDimacs(is, g, capacity, u, v, infty, desc);
+		  }
 		  template<typename Graph>
 		  typename enable_if<lemon::UndirectedTagIndicator<Graph>,void>::type
 		  _addArcEdge(Graph &g, typename Graph::Node s, typename Graph::Node t,
 		              dummy<0> = 0)
+		  {
 		    g.addEdge(s,t);
+		  }
 		  template<typename Graph>
 		  typename disable_if<lemon::UndirectedTagIndicator<Graph>,void>::type
 		  _addArcEdge(Graph &g, typename Graph::Node s, typename Graph::Node t,
 		              dummy<1> = 1)
+		  {
 		    g.addArc(s,t);
+		  }
 		  /// DIMACS plain (di)graph reader function.
+		  /// \brief DIMACS plain (di)graph reader function.
 		  ///
 		  /// This function reads a (di)graph without any designated nodes and
 		  /// maps from DIMACS format, i.e. from DIMACS files having a line
-		  /// starting with
+		  /// This function reads a plain (di)graph without any designated nodes
 		  /// and maps (e.g. a matching instance) from DIMACS format, i.e. from
 		  /// DIMACS files having a line starting with
 		  /// \code
 		  ///   p mat
 		  /// \endcode
 		  /// At the beginning, \c g is cleared by \c g.clear().
 		  ///
 		  /// If the file type was previously evaluated by dimacsType(), then
 		  /// the descriptor struct should be given by the \c dest parameter.
 		  template<typename Graph>
 		  void readDimacsMat(std::istream& is, Graph &g,
 		                     DimacsDescriptor desc=DimacsDescriptor())
+		  {
 		    if(desc.type==DimacsDescriptor::NONE) desc=dimacsType(is);
 		    if(desc.type!=DimacsDescriptor::MAT)
 		      throw FormatError("Problem type mismatch");
 		    g.clear();
 		    std::vector<typename Graph::Node> nodes;
 		    char c;
 		    int i, j;
 		    std::string str;
 		    nodes.resize(desc.nodeNum + 1);
 		    for (int k = 1; k <= desc.nodeNum; ++k) {
 		      nodes[k] = g.addNode();
+		    }
 		    while (is >> c) {
 		      switch (c) {
 		      case 'c': // comment line
 		        getline(is, str);
 		        break;
 		      case 'n': // node definition line
 		        break;
 		      case 'a': // arc definition line
 		        is >> i >> j;
 		        getline(is, str);
 		        _addArcEdge(g,nodes[i], nodes[j]);
 		        break;
+		      }
+		    }
+		  }
 		  /// DIMACS plain digraph writer function.
 		  ///
 		  /// This function writes a digraph without any designated nodes and
 		  /// maps into DIMACS format, i.e. into DIMACS file having a line
 		  /// starting with
 		  /// \code
 		  ///   p mat
 		  /// \endcode
 		  /// If \c comment is not empty, then it will be printed in the first line
 		  /// prefixed by 'c'.
 		  template<typename Digraph>
 		  void writeDimacsMat(std::ostream& os, const Digraph &g,
 		                      std::string comment="") {
 		    typedef typename Digraph::NodeIt NodeIt;
 		    typedef typename Digraph::ArcIt ArcIt;
 		    if(!comment.empty())
 		      os << "c " << comment << std::endl;
 		    os << "p mat " << g.nodeNum() << " " << g.arcNum() << std::endl;
 		    typename Digraph::template NodeMap<int> nodes(g);
 		    int i = 1;
 		    for(NodeIt v(g); v != INVALID; ++v) {
 		      nodes.set(v, i);
 		      ++i;
+		    }
 		    for(ArcIt e(g); e != INVALID; ++e) {
 		      os << "a " << nodes[g.source(e)] << " " << nodes[g.target(e)]
 		         << std::endl;
+		    }
+		  }
 		  /// @}
 		} //namespace lemon
 		#endif //LEMON_DIMACS_H

lemon/graph_to_eps.h

Show inline comments

@@ -15,528 +15,524 @@
 		 * purpose.
+		 *
 		 */
 		#ifndef LEMON_GRAPH_TO_EPS_H
 		#define LEMON_GRAPH_TO_EPS_H
 		#include<iostream>
 		#include<fstream>
 		#include<sstream>
 		#include<algorithm>
 		#include<vector>
 		#ifndef WIN32
 		#include<sys/time.h>
 		#include<ctime>
 		#else
 		#include<lemon/bits/windows.h>
 		#endif
 		#include<lemon/math.h>
 		#include<lemon/core.h>
 		#include<lemon/dim2.h>
 		#include<lemon/maps.h>
 		#include<lemon/color.h>
 		#include<lemon/bits/bezier.h>
 		#include<lemon/error.h>
 		///\ingroup eps_io
 		///\file
 		///\brief A well configurable tool for visualizing graphs
 		namespace lemon {
 		  namespace _graph_to_eps_bits {
 		    template<class MT>
 		    class _NegY {
 		    public:
 		      typedef typename MT::Key Key;
 		      typedef typename MT::Value Value;
 		      const MT &map;
 		      int yscale;
 		      _NegY(const MT &m,bool b) : map(m), yscale(1-b*2) {}
 		      Value operator[](Key n) { return Value(map[n].x,map[n].y*yscale);}
 		    };
+		  }
 		///Default traits class of GraphToEps
 		///Default traits class of \ref GraphToEps.
 		///
 		///\param GR is the type of the underlying graph.
 		template<class GR>
 		struct DefaultGraphToEpsTraits
+		{
 		  typedef GR Graph;
 		  typedef typename Graph::Node Node;
 		  typedef typename Graph::NodeIt NodeIt;
 		  typedef typename Graph::Arc Arc;
 		  typedef typename Graph::ArcIt ArcIt;
 		  typedef typename Graph::InArcIt InArcIt;
 		  typedef typename Graph::OutArcIt OutArcIt;
 		  const Graph &g;
 		  std::ostream& os;
 		  typedef ConstMap<typename Graph::Node,dim2::Point<double> > CoordsMapType;
 		  CoordsMapType _coords;
 		  ConstMap<typename Graph::Node,double > _nodeSizes;
 		  ConstMap<typename Graph::Node,int > _nodeShapes;
 		  ConstMap<typename Graph::Node,Color > _nodeColors;
 		  ConstMap<typename Graph::Arc,Color > _arcColors;
 		  ConstMap<typename Graph::Arc,double > _arcWidths;
 		  double _arcWidthScale;
 		  double _nodeScale;
 		  double _xBorder, _yBorder;
 		  double _scale;
 		  double _nodeBorderQuotient;
 		  bool _drawArrows;
 		  double _arrowLength, _arrowWidth;
 		  bool _showNodes, _showArcs;
 		  bool _enableParallel;
 		  double _parArcDist;
 		  bool _showNodeText;
 		  ConstMap<typename Graph::Node,bool > _nodeTexts;
 		  double _nodeTextSize;
 		  bool _showNodePsText;
 		  ConstMap<typename Graph::Node,bool > _nodePsTexts;
 		  char *_nodePsTextsPreamble;
 		  bool _undirected;
 		  bool _pleaseRemoveOsStream;
 		  bool _scaleToA4;
 		  std::string _title;
 		  std::string _copyright;
 		  enum NodeTextColorType
 		    { DIST_COL=0, DIST_BW=1, CUST_COL=2, SAME_COL=3 } _nodeTextColorType;
 		  ConstMap<typename Graph::Node,Color > _nodeTextColors;
 		  bool _autoNodeScale;
 		  bool _autoArcWidthScale;
 		  bool _absoluteNodeSizes;
 		  bool _absoluteArcWidths;
 		  bool _negY;
 		  bool _preScale;
 		  ///Constructor
 		  ///Constructor
 		  ///\param gr  Reference to the graph to be printed.
 		  ///\param ost Reference to the output stream.
 		  ///By default it is <tt>std::cout</tt>.
 		  ///\param pros If it is \c true, then the \c ostream referenced by \c os
 		  ///will be explicitly deallocated by the destructor.
 		  DefaultGraphToEpsTraits(const GR &gr, std::ostream& ost = std::cout,
 		                          bool pros = false) :
 		    g(gr), os(ost),
 		    _coords(dim2::Point<double>(1,1)), _nodeSizes(1), _nodeShapes(0),
 		    _nodeColors(WHITE), _arcColors(BLACK),
 		    _arcWidths(1.0), _arcWidthScale(0.003),
 		    _nodeScale(.01), _xBorder(10), _yBorder(10), _scale(1.0),
 		    _nodeBorderQuotient(.1),
 		    _drawArrows(false), _arrowLength(1), _arrowWidth(0.3),
 		    _showNodes(true), _showArcs(true),
 		    _enableParallel(false), _parArcDist(1),
 		    _showNodeText(false), _nodeTexts(false), _nodeTextSize(1),
 		    _showNodePsText(false), _nodePsTexts(false), _nodePsTextsPreamble(0),
 		    _undirected(lemon::UndirectedTagIndicator<GR>::value),
 		    _pleaseRemoveOsStream(pros), _scaleToA4(false),
 		    _nodeTextColorType(SAME_COL), _nodeTextColors(BLACK),
 		    _autoNodeScale(false),
 		    _autoArcWidthScale(false),
 		    _absoluteNodeSizes(false),
 		    _absoluteArcWidths(false),
 		    _negY(false),
 		    _preScale(true)
 		  {}
 		};
 		///Auxiliary class to implement the named parameters of \ref graphToEps()
 		///Auxiliary class to implement the named parameters of \ref graphToEps().
 		///
 		///For detailed examples see the \ref graph_to_eps_demo.cc demo file.
 		template<class T> class GraphToEps : public T
+		{
 		  // Can't believe it is required by the C++ standard
 		  using T::g;
 		  using T::os;
 		  using T::_coords;
 		  using T::_nodeSizes;
 		  using T::_nodeShapes;
 		  using T::_nodeColors;
 		  using T::_arcColors;
 		  using T::_arcWidths;
 		  using T::_arcWidthScale;
 		  using T::_nodeScale;
 		  using T::_xBorder;
 		  using T::_yBorder;
 		  using T::_scale;
 		  using T::_nodeBorderQuotient;
 		  using T::_drawArrows;
 		  using T::_arrowLength;
 		  using T::_arrowWidth;
 		  using T::_showNodes;
 		  using T::_showArcs;
 		  using T::_enableParallel;
 		  using T::_parArcDist;
 		  using T::_showNodeText;
 		  using T::_nodeTexts;
 		  using T::_nodeTextSize;
 		  using T::_showNodePsText;
 		  using T::_nodePsTexts;
 		  using T::_nodePsTextsPreamble;
 		  using T::_undirected;
 		  using T::_pleaseRemoveOsStream;
 		  using T::_scaleToA4;
 		  using T::_title;
 		  using T::_copyright;
 		  using T::NodeTextColorType;
 		  using T::CUST_COL;
 		  using T::DIST_COL;
 		  using T::DIST_BW;
 		  using T::_nodeTextColorType;
 		  using T::_nodeTextColors;
 		  using T::_autoNodeScale;
 		  using T::_autoArcWidthScale;
 		  using T::_absoluteNodeSizes;
 		  using T::_absoluteArcWidths;
 		  using T::_negY;
 		  using T::_preScale;
 		  // dradnats ++C eht yb deriuqer si ti eveileb t'naC
 		  typedef typename T::Graph Graph;
 		  typedef typename Graph::Node Node;
 		  typedef typename Graph::NodeIt NodeIt;
 		  typedef typename Graph::Arc Arc;
 		  typedef typename Graph::ArcIt ArcIt;
 		  typedef typename Graph::InArcIt InArcIt;
 		  typedef typename Graph::OutArcIt OutArcIt;
 		  static const int INTERPOL_PREC;
 		  static const double A4HEIGHT;
 		  static const double A4WIDTH;
 		  static const double A4BORDER;
 		  bool dontPrint;
 		public:
 		  ///Node shapes
 		  ///Node shapes.
 		  ///
 		  enum NodeShapes {
 		    /// = 0
 		    ///\image html nodeshape_0.png
 		    ///\image latex nodeshape_0.eps "CIRCLE shape (0)" width=2cm
 		    CIRCLE=0,
 		    /// = 1
 		    ///\image html nodeshape_1.png
 		    ///\image latex nodeshape_1.eps "SQUARE shape (1)" width=2cm
 		    ///
 		    SQUARE=1,
 		    /// = 2
 		    ///\image html nodeshape_2.png
 		    ///\image latex nodeshape_2.eps "DIAMOND shape (2)" width=2cm
 		    ///
 		    DIAMOND=2,
 		    /// = 3
 		    ///\image html nodeshape_3.png
 		    ///\image latex nodeshape_2.eps "MALE shape (4)" width=2cm
 		    ///
 		    ///\image latex nodeshape_3.eps "MALE shape (3)" width=2cm
 		    MALE=3,
 		    /// = 4
 		    ///\image html nodeshape_4.png
 		    ///\image latex nodeshape_2.eps "FEMALE shape (4)" width=2cm
 		    ///
 		    ///\image latex nodeshape_4.eps "FEMALE shape (4)" width=2cm
 		    FEMALE=4
 		  };
 		private:
 		  class arcLess {
 		    const Graph &g;
 		  public:
 		    arcLess(const Graph &_g) : g(_g) {}
 		    bool operator()(Arc a,Arc b) const
+		    {
 		      Node ai=std::min(g.source(a),g.target(a));
 		      Node aa=std::max(g.source(a),g.target(a));
 		      Node bi=std::min(g.source(b),g.target(b));
 		      Node ba=std::max(g.source(b),g.target(b));
 		      return ai<bi ||
 		        (ai==bi && (aa < ba ||
 		                    (aa==ba && ai==g.source(a) && bi==g.target(b))));
+		    }
 		  };
 		  bool isParallel(Arc e,Arc f) const
+		  {
 		    return (g.source(e)==g.source(f)&&
 		            g.target(e)==g.target(f)) ||
 		      (g.source(e)==g.target(f)&&
 		       g.target(e)==g.source(f));
+		  }
 		  template<class TT>
 		  static std::string psOut(const dim2::Point<TT> &p)
+		    {
 		      std::ostringstream os;
 		      os << p.x << ' ' << p.y;
 		      return os.str();
+		    }
 		  static std::string psOut(const Color &c)
+		    {
 		      std::ostringstream os;
 		      os << c.red() << ' ' << c.green() << ' ' << c.blue();
 		      return os.str();
+		    }
 		public:
 		  GraphToEps(const T &t) : T(t), dontPrint(false) {};
 		  template<class X> struct CoordsTraits : public T {
 		  typedef X CoordsMapType;
 		    const X &_coords;
 		    CoordsTraits(const T &t,const X &x) : T(t), _coords(x) {}
 		  };
 		  ///Sets the map of the node coordinates
 		  ///Sets the map of the node coordinates.
 		  ///\param x must be a node map with \ref dim2::Point "dim2::Point<double>" or
 		  ///\ref dim2::Point "dim2::Point<int>" values.
 		  template<class X> GraphToEps<CoordsTraits<X> > coords(const X &x) {
 		    dontPrint=true;
 		    return GraphToEps<CoordsTraits<X> >(CoordsTraits<X>(*this,x));
+		  }
 		  template<class X> struct NodeSizesTraits : public T {
 		    const X &_nodeSizes;
 		    NodeSizesTraits(const T &t,const X &x) : T(t), _nodeSizes(x) {}
 		  };
 		  ///Sets the map of the node sizes
 		  ///Sets the map of the node sizes.
 		  ///\param x must be a node map with \c double (or convertible) values.
 		  template<class X> GraphToEps<NodeSizesTraits<X> > nodeSizes(const X &x)
+		  {
 		    dontPrint=true;
 		    return GraphToEps<NodeSizesTraits<X> >(NodeSizesTraits<X>(*this,x));
+		  }
 		  template<class X> struct NodeShapesTraits : public T {
 		    const X &_nodeShapes;
 		    NodeShapesTraits(const T &t,const X &x) : T(t), _nodeShapes(x) {}
 		  };
 		  ///Sets the map of the node shapes
 		  ///Sets the map of the node shapes.
 		  ///The available shape values
 		  ///can be found in \ref NodeShapes "enum NodeShapes".
 		  ///\param x must be a node map with \c int (or convertible) values.
 		  ///\sa NodeShapes
 		  template<class X> GraphToEps<NodeShapesTraits<X> > nodeShapes(const X &x)
+		  {
 		    dontPrint=true;
 		    return GraphToEps<NodeShapesTraits<X> >(NodeShapesTraits<X>(*this,x));
+		  }
 		  template<class X> struct NodeTextsTraits : public T {
 		    const X &_nodeTexts;
 		    NodeTextsTraits(const T &t,const X &x) : T(t), _nodeTexts(x) {}
 		  };
 		  ///Sets the text printed on the nodes
 		  ///Sets the text printed on the nodes.
 		  ///\param x must be a node map with type that can be pushed to a standard
 		  ///\c ostream.
 		  template<class X> GraphToEps<NodeTextsTraits<X> > nodeTexts(const X &x)
+		  {
 		    dontPrint=true;
 		    _showNodeText=true;
 		    return GraphToEps<NodeTextsTraits<X> >(NodeTextsTraits<X>(*this,x));
+		  }
 		  template<class X> struct NodePsTextsTraits : public T {
 		    const X &_nodePsTexts;
 		    NodePsTextsTraits(const T &t,const X &x) : T(t), _nodePsTexts(x) {}
 		  };
 		  ///Inserts a PostScript block to the nodes
 		  ///With this command it is possible to insert a verbatim PostScript
 		  ///block to the nodes.
 		  ///The PS current point will be moved to the center of the node before
 		  ///the PostScript block inserted.
 		  ///
 		  ///Before and after the block a newline character is inserted so you
 		  ///don't have to bother with the separators.
 		  ///
 		  ///\param x must be a node map with type that can be pushed to a standard
 		  ///\c ostream.
 		  ///
 		  ///\sa nodePsTextsPreamble()
 		  template<class X> GraphToEps<NodePsTextsTraits<X> > nodePsTexts(const X &x)
+		  {
 		    dontPrint=true;
 		    _showNodePsText=true;
 		    return GraphToEps<NodePsTextsTraits<X> >(NodePsTextsTraits<X>(*this,x));
+		  }
 		  template<class X> struct ArcWidthsTraits : public T {
 		    const X &_arcWidths;
 		    ArcWidthsTraits(const T &t,const X &x) : T(t), _arcWidths(x) {}
 		  };
 		  ///Sets the map of the arc widths
 		  ///Sets the map of the arc widths.
 		  ///\param x must be an arc map with \c double (or convertible) values.
 		  template<class X> GraphToEps<ArcWidthsTraits<X> > arcWidths(const X &x)
+		  {
 		    dontPrint=true;
 		    return GraphToEps<ArcWidthsTraits<X> >(ArcWidthsTraits<X>(*this,x));
+		  }
 		  template<class X> struct NodeColorsTraits : public T {
 		    const X &_nodeColors;
 		    NodeColorsTraits(const T &t,const X &x) : T(t), _nodeColors(x) {}
 		  };
 		  ///Sets the map of the node colors
 		  ///Sets the map of the node colors.
 		  ///\param x must be a node map with \ref Color values.
 		  ///
 		  ///\sa Palette
 		  template<class X> GraphToEps<NodeColorsTraits<X> >
 		  nodeColors(const X &x)
+		  {
 		    dontPrint=true;
 		    return GraphToEps<NodeColorsTraits<X> >(NodeColorsTraits<X>(*this,x));
+		  }
 		  template<class X> struct NodeTextColorsTraits : public T {
 		    const X &_nodeTextColors;
 		    NodeTextColorsTraits(const T &t,const X &x) : T(t), _nodeTextColors(x) {}
 		  };
 		  ///Sets the map of the node text colors
 		  ///Sets the map of the node text colors.
 		  ///\param x must be a node map with \ref Color values.
 		  ///
 		  ///\sa Palette
 		  template<class X> GraphToEps<NodeTextColorsTraits<X> >
 		  nodeTextColors(const X &x)
+		  {
 		    dontPrint=true;
 		    _nodeTextColorType=CUST_COL;
 		    return GraphToEps<NodeTextColorsTraits<X> >
 		      (NodeTextColorsTraits<X>(*this,x));
+		  }
 		  template<class X> struct ArcColorsTraits : public T {
 		    const X &_arcColors;
 		    ArcColorsTraits(const T &t,const X &x) : T(t), _arcColors(x) {}
 		  };
 		  ///Sets the map of the arc colors
 		  ///Sets the map of the arc colors.
 		  ///\param x must be an arc map with \ref Color values.
 		  ///
 		  ///\sa Palette
 		  template<class X> GraphToEps<ArcColorsTraits<X> >
 		  arcColors(const X &x)
+		  {
 		    dontPrint=true;
 		    return GraphToEps<ArcColorsTraits<X> >(ArcColorsTraits<X>(*this,x));
+		  }
 		  ///Sets a global scale factor for node sizes
 		  ///Sets a global scale factor for node sizes.
 		  ///
 		  /// If nodeSizes() is not given, this function simply sets the node
 		  /// sizes to \c d.  If nodeSizes() is given, but
 		  /// autoNodeScale() is not, then the node size given by
 		  /// nodeSizes() will be multiplied by the value \c d.
 		  /// If both nodeSizes() and autoNodeScale() are used, then the
 		  /// node sizes will be scaled in such a way that the greatest size will be
 		  /// equal to \c d.
 		  /// \sa nodeSizes()
 		  /// \sa autoNodeScale()
 		  GraphToEps<T> &nodeScale(double d=.01) {_nodeScale=d;return *this;}
 		  ///Turns on/off the automatic node size scaling.
 		  ///Turns on/off the automatic node size scaling.
 		  ///
 		  ///\sa nodeScale()
 		  ///
 		  GraphToEps<T> &autoNodeScale(bool b=true) {
 		    _autoNodeScale=b;return *this;
+		  }
 		  ///Turns on/off the absolutematic node size scaling.
 		  ///Turns on/off the absolutematic node size scaling.
 		  ///
 		  ///\sa nodeScale()
 		  ///
 		  GraphToEps<T> &absoluteNodeSizes(bool b=true) {
 		    _absoluteNodeSizes=b;return *this;
+		  }
 		  ///Negates the Y coordinates.
 		  GraphToEps<T> &negateY(bool b=true) {
 		    _negY=b;return *this;
+		  }
 		  ///Turn on/off pre-scaling
 		  ///By default graphToEps() rescales the whole image in order to avoid
 		  ///very big or very small bounding boxes.
 		  ///
 		  ///This (p)rescaling can be turned off with this function.
 		  ///
 		  GraphToEps<T> &preScale(bool b=true) {
 		    _preScale=b;return *this;
+		  }
 		  ///Sets a global scale factor for arc widths
 		  /// Sets a global scale factor for arc widths.
 		  ///
 		  /// If arcWidths() is not given, this function simply sets the arc
 		  /// widths to \c d.  If arcWidths() is given, but
 		  /// autoArcWidthScale() is not, then the arc withs given by
 		  /// arcWidths() will be multiplied by the value \c d.
 		  /// If both arcWidths() and autoArcWidthScale() are used, then the
 		  /// arc withs will be scaled in such a way that the greatest width will be
 		  /// equal to \c d.
 		  GraphToEps<T> &arcWidthScale(double d=.003) {_arcWidthScale=d;return *this;}
 		  ///Turns on/off the automatic arc width scaling.
 		  ///Turns on/off the automatic arc width scaling.
 		  ///
 		  ///\sa arcWidthScale()

lemon/kruskal.h

Show inline comments

 		/* -*- mode: C++; indent-tabs-mode: nil; -*-
+		 *
 		 * This file is a part of LEMON, a generic C++ optimization library.
+		 *
 		 * Copyright (C) 2003-2009
 		 * 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_KRUSKAL_H
 		#define LEMON_KRUSKAL_H
 		#include <algorithm>
 		#include <vector>
 		#include <lemon/unionfind.h>
 		#include <lemon/maps.h>
 		#include <lemon/core.h>
 		#include <lemon/bits/traits.h>
 		///\ingroup spantree
 		///\file
 		///\brief Kruskal's algorithm to compute a minimum cost spanning tree
 		///
 		///Kruskal's algorithm to compute a minimum cost spanning tree.
 		///
 		namespace lemon {
 		  namespace _kruskal_bits {
 		    // Kruskal for directed graphs.
 		    template <typename Digraph, typename In, typename Out>
 		    typename disable_if<lemon::UndirectedTagIndicator<Digraph>,
 		                       typename In::value_type::second_type >::type
 		    kruskal(const Digraph& digraph, const In& in, Out& out,dummy<0> = 0) {
 		      typedef typename In::value_type::second_type Value;
 		      typedef typename Digraph::template NodeMap<int> IndexMap;
 		      typedef typename Digraph::Node Node;
 		      IndexMap index(digraph);
 		      UnionFind<IndexMap> uf(index);
 		      for (typename Digraph::NodeIt it(digraph); it != INVALID; ++it) {
 		        uf.insert(it);
+		      }
 		      Value tree_value = 0;
 		      for (typename In::const_iterator it = in.begin(); it != in.end(); ++it) {
 		        if (uf.join(digraph.target(it->first),digraph.source(it->first))) {
 		          out.set(it->first, true);
 		          tree_value += it->second;
+		        }
 		        else {
 		          out.set(it->first, false);
+		        }
+		      }
 		      return tree_value;
+		    }
 		    // Kruskal for undirected graphs.
 		    template <typename Graph, typename In, typename Out>
 		    typename enable_if<lemon::UndirectedTagIndicator<Graph>,
 		                       typename In::value_type::second_type >::type
 		    kruskal(const Graph& graph, const In& in, Out& out,dummy<1> = 1) {
 		      typedef typename In::value_type::second_type Value;
 		      typedef typename Graph::template NodeMap<int> IndexMap;
 		      typedef typename Graph::Node Node;
 		      IndexMap index(graph);
 		      UnionFind<IndexMap> uf(index);
 		      for (typename Graph::NodeIt it(graph); it != INVALID; ++it) {
 		        uf.insert(it);
+		      }
 		      Value tree_value = 0;
 		      for (typename In::const_iterator it = in.begin(); it != in.end(); ++it) {
 		        if (uf.join(graph.u(it->first),graph.v(it->first))) {
 		          out.set(it->first, true);
 		          tree_value += it->second;
+		        }
 		        else {
 		          out.set(it->first, false);
+		        }
+		      }
 		      return tree_value;
+		    }
 		    template <typename Sequence>
 		    struct PairComp {
 		      typedef typename Sequence::value_type Value;
 		      bool operator()(const Value& left, const Value& right) {
 		        return left.second < right.second;
+		      }
 		    };
 		    template <typename In, typename Enable = void>
 		    struct SequenceInputIndicator {
 		      static const bool value = false;
 		    };
 		    template <typename In>
 		    struct SequenceInputIndicator<In,
 		      typename exists<typename In::value_type::first_type>::type> {
 		      static const bool value = true;
 		    };
 		    template <typename In, typename Enable = void>
 		    struct MapInputIndicator {
 		      static const bool value = false;
 		    };
 		    template <typename In>
 		    struct MapInputIndicator<In,
 		      typename exists<typename In::Value>::type> {
 		      static const bool value = true;
 		    };
 		    template <typename In, typename Enable = void>
 		    struct SequenceOutputIndicator {
 		      static const bool value = false;
 		    };
 		    template <typename Out>
 		    struct SequenceOutputIndicator<Out,
 		      typename exists<typename Out::value_type>::type> {
 		      static const bool value = true;
 		    };
 		    template <typename Out, typename Enable = void>
 		    struct MapOutputIndicator {
 		      static const bool value = false;
 		    };
 		    template <typename Out>
 		    struct MapOutputIndicator<Out,
 		      typename exists<typename Out::Value>::type> {
 		      static const bool value = true;
 		    };
 		    template <typename In, typename InEnable = void>
 		    struct KruskalValueSelector {};
 		    template <typename In>
 		    struct KruskalValueSelector<In,
 		      typename enable_if<SequenceInputIndicator<In>, void>::type>
+		    {
 		      typedef typename In::value_type::second_type Value;
 		    };
 		    template <typename In>
 		    struct KruskalValueSelector<In,
 		      typename enable_if<MapInputIndicator<In>, void>::type>
+		    {
 		      typedef typename In::Value Value;
 		    };
 		    template <typename Graph, typename In, typename Out,
 		              typename InEnable = void>
 		    struct KruskalInputSelector {};
 		    template <typename Graph, typename In, typename Out,
 		              typename InEnable = void>
 		    struct KruskalOutputSelector {};
 		    template <typename Graph, typename In, typename Out>
 		    struct KruskalInputSelector<Graph, In, Out,
 		      typename enable_if<SequenceInputIndicator<In>, void>::type >
+		    {
 		      typedef typename In::value_type::second_type Value;
 		      static Value kruskal(const Graph& graph, const In& in, Out& out) {
 		        return KruskalOutputSelector<Graph, In, Out>::
 		          kruskal(graph, in, out);
+		      }
 		    };
 		    template <typename Graph, typename In, typename Out>
 		    struct KruskalInputSelector<Graph, In, Out,
 		      typename enable_if<MapInputIndicator<In>, void>::type >
+		    {
 		      typedef typename In::Value Value;
 		      static Value kruskal(const Graph& graph, const In& in, Out& out) {
 		        typedef typename In::Key MapArc;
 		        typedef typename In::Value Value;
 		        typedef typename ItemSetTraits<Graph, MapArc>::ItemIt MapArcIt;
 		        typedef std::vector<std::pair<MapArc, Value> > Sequence;
 		        Sequence seq;
 		        for (MapArcIt it(graph); it != INVALID; ++it) {
 		          seq.push_back(std::make_pair(it, in[it]));
+		        }
 		        std::sort(seq.begin(), seq.end(), PairComp<Sequence>());
 		        return KruskalOutputSelector<Graph, Sequence, Out>::
 		          kruskal(graph, seq, out);
+		      }
 		    };
 		    template <typename T>
 		    struct RemoveConst {
 		      typedef T type;
 		    };
 		    template <typename T>
 		    struct RemoveConst<const T> {
 		      typedef T type;
 		    };
 		    template <typename Graph, typename In, typename Out>
 		    struct KruskalOutputSelector<Graph, In, Out,
 		      typename enable_if<SequenceOutputIndicator<Out>, void>::type >
+		    {
 		      typedef typename In::value_type::second_type Value;
 		      static Value kruskal(const Graph& graph, const In& in, Out& out) {
 		        typedef LoggerBoolMap<typename RemoveConst<Out>::type> Map;
 		        Map map(out);
 		        return _kruskal_bits::kruskal(graph, in, map);
+		      }
 		    };
 		    template <typename Graph, typename In, typename Out>
 		    struct KruskalOutputSelector<Graph, In, Out,
 		      typename enable_if<MapOutputIndicator<Out>, void>::type >
+		    {
 		      typedef typename In::value_type::second_type Value;
 		      static Value kruskal(const Graph& graph, const In& in, Out& out) {
 		        return _kruskal_bits::kruskal(graph, in, out);
+		      }
 		    };
+		  }
 		  /// \ingroup spantree
 		  ///
-		  /// \brief Kruskal algorithm to find a minimum cost spanning tree of
+		  /// \brief Kruskal's algorithm for finding a minimum cost spanning tree of
 		  /// a graph.
 		  ///
 		  /// This function runs Kruskal's algorithm to find a minimum cost
 		  /// spanning tree.
+		  /// spanning tree of a graph.
 		  /// Due to some C++ hacking, it accepts various input and output types.
 		  ///
 		  /// \param g The graph the algorithm runs on.
 		  /// It can be either \ref concepts::Digraph "directed" or
 		  /// \ref concepts::Graph "undirected".
 		  /// If the graph is directed, the algorithm consider it to be
 		  /// undirected by disregarding the direction of the arcs.
 		  ///
 		  /// \param in This object is used to describe the arc/edge costs.
 		  /// It can be one of the following choices.
 		  /// - An STL compatible 'Forward Container' with
 		  /// <tt>std::pair<GR::Arc,X></tt> or
 		  /// <tt>std::pair<GR::Edge,X></tt> as its <tt>value_type</tt>, where
-		  /// \c X is the type of the costs. The pairs indicates the arcs/edges
+		  /// <tt>std::pair<GR::Arc,C></tt> or
 		  /// <tt>std::pair<GR::Edge,C></tt> as its <tt>value_type</tt>, where
 		  /// \c C is the type of the costs. The pairs indicates the arcs/edges
 		  /// along with the assigned cost. <em>They must be in a
 		  /// cost-ascending order.</em>
 		  /// - Any readable arc/edge map. The values of the map indicate the
 		  /// arc/edge costs.
 		  ///
 		  /// \retval out Here we also have a choice.
 		  /// - It can be a writable \c bool arc/edge map. After running the
 		  /// algorithm it will contain the found minimum cost spanning
 		  /// - It can be a writable arc/edge map with \c bool value type. After
 		  /// running the algorithm it will contain the found minimum cost spanning
 		  /// tree: the value of an arc/edge will be set to \c true if it belongs
 		  /// to the tree, otherwise it will be set to \c false. The value of
 		  /// each arc/edge will be set exactly once.
 		  /// - It can also be an iteraror of an STL Container with
 		  /// <tt>GR::Arc</tt> or <tt>GR::Edge</tt> as its
 		  /// <tt>value_type</tt>.  The algorithm copies the elements of the
 		  /// found tree into this sequence.  For example, if we know that the
 		  /// spanning tree of the graph \c g has say 53 arcs, then we can
 		  /// put its arcs into an STL vector \c tree with a code like this.
 		  ///\code
 		  /// std::vector<Arc> tree(53);
 		  /// kruskal(g,cost,tree.begin());
 		  ///\endcode
 		  /// Or if we don't know in advance the size of the tree, we can
 		  /// write this.
 		  ///\code
 		  /// std::vector<Arc> tree;
 		  /// kruskal(g,cost,std::back_inserter(tree));
 		  ///\endcode
 		  ///
 		  /// \return The total cost of the found spanning tree.
 		  ///
 		  /// \note If the input graph is not (weakly) connected, a spanning
 		  /// forest is calculated instead of a spanning tree.
 		#ifdef DOXYGEN
 		  template <class Graph, class In, class Out>
 		  Value kruskal(GR const& g, const In& in, Out& out)
 		  template <typename Graph, typename In, typename Out>
 		  Value kruskal(const Graph& g, const In& in, Out& out)
 		#else
 		  template <class Graph, class In, class Out>
 		  inline typename _kruskal_bits::KruskalValueSelector<In>::Value
 		  kruskal(const Graph& graph, const In& in, Out& out)
 		#endif
+		  {
 		    return _kruskal_bits::KruskalInputSelector<Graph, In, Out>::
 		      kruskal(graph, in, out);
+		  }
 		  template <class Graph, class In, class Out>
 		  inline typename _kruskal_bits::KruskalValueSelector<In>::Value
 		  kruskal(const Graph& graph, const In& in, const Out& out)
+		  {
 		    return _kruskal_bits::KruskalInputSelector<Graph, In, const Out>::
 		      kruskal(graph, in, out);
+		  }
 		} //namespace lemon
 		#endif //LEMON_KRUSKAL_H

lemon/lgf_reader.h

Show inline comments

@@ -340,2336 +340,2336 @@
 		        char c;
 		        std::string line;
 		        while (is.get(c) && c != '@') {
 		          if (c == '\n') {
 		            ++line_num;
 		          } else if (c == '#') {
 		            getline(is, line);
 		            ++line_num;
 		          } else if (!isWhiteSpace(c)) {
 		            is.putback(c);
 		            getline(is, line);
 		            _functor(line);
 		            ++line_num;
+		          }
+		        }
 		        if (is) is.putback(c);
 		        else if (is.eof()) is.clear();
+		      }
 		    };
 		    template <typename Functor>
 		    class StreamSection : public Section {
 		    private:
 		      Functor _functor;
 		    public:
 		      StreamSection(const Functor& functor) : _functor(functor) {}
 		      virtual ~StreamSection() {}
 		      virtual void process(std::istream& is, int& line_num) {
 		        _functor(is, line_num);
 		        char c;
 		        std::string line;
 		        while (is.get(c) && c != '@') {
 		          if (c == '\n') {
 		            ++line_num;
 		          } else if (!isWhiteSpace(c)) {
 		            getline(is, line);
 		            ++line_num;
+		          }
+		        }
 		        if (is) is.putback(c);
 		        else if (is.eof()) is.clear();
+		      }
 		    };
+		  }
 		  template <typename Digraph>
 		  class DigraphReader;
 		  template <typename Digraph>
 		  DigraphReader<Digraph> digraphReader(Digraph& digraph,
 		                                       std::istream& is = std::cin);
 		  template <typename Digraph>
 		  DigraphReader<Digraph> digraphReader(Digraph& digraph, const std::string& fn);
 		  template <typename Digraph>
 		  DigraphReader<Digraph> digraphReader(Digraph& digraph, const char *fn);
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief \ref lgf-format "LGF" reader for directed graphs
 		  ///
 		  /// This utility reads an \ref lgf-format "LGF" file.
 		  ///
 		  /// The reading method does a batch processing. The user creates a
 		  /// reader object, then various reading rules can be added to the
 		  /// reader, and eventually the reading is executed with the \c run()
 		  /// member function. A map reading rule can be added to the reader
 		  /// with the \c nodeMap() or \c arcMap() members. An optional
 		  /// converter parameter can also be added as a standard functor
 		  /// converting from \c std::string to the value type of the map. If it
 		  /// is set, it will determine how the tokens in the file should be
 		  /// converted to the value type of the map. If the functor is not set,
 		  /// then a default conversion will be used. One map can be read into
 		  /// multiple map objects at the same time. The \c attribute(), \c
 		  /// node() and \c arc() functions are used to add attribute reading
 		  /// rules.
 		  ///
 		  ///\code
 		  /// DigraphReader<Digraph>(digraph, std::cin).
 		  ///   nodeMap("coordinates", coord_map).
 		  ///   arcMap("capacity", cap_map).
 		  ///   node("source", src).
 		  ///   node("target", trg).
 		  ///   attribute("caption", caption).
 		  ///   run();
 		  ///\endcode
 		  ///
 		  /// By default the reader uses the first section in the file of the
 		  /// proper type. If a section has an optional name, then it can be
 		  /// selected for reading by giving an optional name parameter to the
 		  /// \c nodes(), \c arcs() or \c attributes() functions.
 		  ///
 		  /// The \c useNodes() and \c useArcs() functions are used to tell the reader
 		  /// that the nodes or arcs should not be constructed (added to the
 		  /// graph) during the reading, but instead the label map of the items
 		  /// are given as a parameter of these functions. An
 		  /// application of these functions is multipass reading, which is
 		  /// important if two \c \@arcs sections must be read from the
 		  /// file. In this case the first phase would read the node set and one
 		  /// of the arc sets, while the second phase would read the second arc
 		  /// set into an \e ArcSet class (\c SmartArcSet or \c ListArcSet).
 		  /// The previously read label node map should be passed to the \c
 		  /// useNodes() functions. Another application of multipass reading when
 		  /// paths are given as a node map or an arc map.
 		  /// It is impossible to read this in
 		  /// a single pass, because the arcs are not constructed when the node
 		  /// maps are read.
 		  template <typename GR>
 		  class DigraphReader {
 		  public:
 		    typedef GR Digraph;
 		  private:
 		    TEMPLATE_DIGRAPH_TYPEDEFS(Digraph);
 		    std::istream* _is;
 		    bool local_is;
 		    std::string _filename;
 		    Digraph& _digraph;
 		    std::string _nodes_caption;
 		    std::string _arcs_caption;
 		    std::string _attributes_caption;
 		    typedef std::map<std::string, Node> NodeIndex;
 		    NodeIndex _node_index;
 		    typedef std::map<std::string, Arc> ArcIndex;
 		    ArcIndex _arc_index;
 		    typedef std::vector<std::pair<std::string,
 		      _reader_bits::MapStorageBase<Node>*> > NodeMaps;
 		    NodeMaps _node_maps;
 		    typedef std::vector<std::pair<std::string,
 		      _reader_bits::MapStorageBase<Arc>*> >ArcMaps;
 		    ArcMaps _arc_maps;
 		    typedef std::multimap<std::string, _reader_bits::ValueStorageBase*>
 		      Attributes;
 		    Attributes _attributes;
 		    bool _use_nodes;
 		    bool _use_arcs;
 		    bool _skip_nodes;
 		    bool _skip_arcs;
 		    int line_num;
 		    std::istringstream line;
 		  public:
 		    /// \brief Constructor
 		    ///
 		    /// Construct a directed graph reader, which reads from the given
 		    /// input stream.
 		    DigraphReader(Digraph& digraph, std::istream& is = std::cin)
 		      : _is(&is), local_is(false), _digraph(digraph),
 		        _use_nodes(false), _use_arcs(false),
 		        _skip_nodes(false), _skip_arcs(false) {}
 		    /// \brief Constructor
 		    ///
 		    /// Construct a directed graph reader, which reads from the given
 		    /// file.
 		    DigraphReader(Digraph& digraph, const std::string& fn)
 		      : _is(new std::ifstream(fn.c_str())), local_is(true),
 		        _filename(fn), _digraph(digraph),
 		        _use_nodes(false), _use_arcs(false),
 		        _skip_nodes(false), _skip_arcs(false) {
 		      if (!(*_is)) {
 		        delete _is;
 		        throw IoError("Cannot open file", fn);
+		      }
+		    }
 		    /// \brief Constructor
 		    ///
 		    /// Construct a directed graph reader, which reads from the given
 		    /// file.
 		    DigraphReader(Digraph& digraph, const char* fn)
 		      : _is(new std::ifstream(fn)), local_is(true),
 		        _filename(fn), _digraph(digraph),
 		        _use_nodes(false), _use_arcs(false),
 		        _skip_nodes(false), _skip_arcs(false) {
 		      if (!(*_is)) {
 		        delete _is;
 		        throw IoError("Cannot open file", fn);
+		      }
+		    }
 		    /// \brief Destructor
 		    ~DigraphReader() {
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        delete it->second;
+		      }
 		      for (typename ArcMaps::iterator it = _arc_maps.begin();
 		           it != _arc_maps.end(); ++it) {
 		        delete it->second;
+		      }
 		      for (typename Attributes::iterator it = _attributes.begin();
 		           it != _attributes.end(); ++it) {
 		        delete it->second;
+		      }
 		      if (local_is) {
 		        delete _is;
+		      }
+		    }
 		  private:
 		    template <typename DGR>
 		    friend DigraphReader<DGR> digraphReader(DGR& digraph, std::istream& is);
 		    template <typename DGR>
 		    friend DigraphReader<DGR> digraphReader(DGR& digraph,
 		                                            const std::string& fn);
 		    template <typename DGR>
 		    friend DigraphReader<DGR> digraphReader(DGR& digraph, const char *fn);
 		    DigraphReader(DigraphReader& other)
 		      : _is(other._is), local_is(other.local_is), _digraph(other._digraph),
 		        _use_nodes(other._use_nodes), _use_arcs(other._use_arcs),
 		        _skip_nodes(other._skip_nodes), _skip_arcs(other._skip_arcs) {
 		      other._is = 0;
 		      other.local_is = false;
 		      _node_index.swap(other._node_index);
 		      _arc_index.swap(other._arc_index);
 		      _node_maps.swap(other._node_maps);
 		      _arc_maps.swap(other._arc_maps);
 		      _attributes.swap(other._attributes);
 		      _nodes_caption = other._nodes_caption;
 		      _arcs_caption = other._arcs_caption;
 		      _attributes_caption = other._attributes_caption;
+		    }
 		    DigraphReader& operator=(const DigraphReader&);
 		  public:
-		    /// \name Reading rules
+		    /// \name Reading Rules
 		    /// @{
 		    /// \brief Node map reading rule
 		    ///
 		    /// Add a node map reading rule to the reader.
 		    template <typename Map>
 		    DigraphReader& nodeMap(const std::string& caption, Map& map) {
 		      checkConcept<concepts::WriteMap<Node, typename Map::Value>, Map>();
 		      _reader_bits::MapStorageBase<Node>* storage =
 		        new _reader_bits::MapStorage<Node, Map>(map);
 		      _node_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Node map reading rule
 		    ///
 		    /// Add a node map reading rule with specialized converter to the
 		    /// reader.
 		    template <typename Map, typename Converter>
 		    DigraphReader& nodeMap(const std::string& caption, Map& map,
 		                           const Converter& converter = Converter()) {
 		      checkConcept<concepts::WriteMap<Node, typename Map::Value>, Map>();
 		      _reader_bits::MapStorageBase<Node>* storage =
 		        new _reader_bits::MapStorage<Node, Map, Converter>(map, converter);
 		      _node_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Arc map reading rule
 		    ///
 		    /// Add an arc map reading rule to the reader.
 		    template <typename Map>
 		    DigraphReader& arcMap(const std::string& caption, Map& map) {
 		      checkConcept<concepts::WriteMap<Arc, typename Map::Value>, Map>();
 		      _reader_bits::MapStorageBase<Arc>* storage =
 		        new _reader_bits::MapStorage<Arc, Map>(map);
 		      _arc_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Arc map reading rule
 		    ///
 		    /// Add an arc map reading rule with specialized converter to the
 		    /// reader.
 		    template <typename Map, typename Converter>
 		    DigraphReader& arcMap(const std::string& caption, Map& map,
 		                          const Converter& converter = Converter()) {
 		      checkConcept<concepts::WriteMap<Arc, typename Map::Value>, Map>();
 		      _reader_bits::MapStorageBase<Arc>* storage =
 		        new _reader_bits::MapStorage<Arc, Map, Converter>(map, converter);
 		      _arc_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Attribute reading rule
 		    ///
 		    /// Add an attribute reading rule to the reader.
 		    template <typename Value>
 		    DigraphReader& attribute(const std::string& caption, Value& value) {
 		      _reader_bits::ValueStorageBase* storage =
 		        new _reader_bits::ValueStorage<Value>(value);
 		      _attributes.insert(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Attribute reading rule
 		    ///
 		    /// Add an attribute reading rule with specialized converter to the
 		    /// reader.
 		    template <typename Value, typename Converter>
 		    DigraphReader& attribute(const std::string& caption, Value& value,
 		                             const Converter& converter = Converter()) {
 		      _reader_bits::ValueStorageBase* storage =
 		        new _reader_bits::ValueStorage<Value, Converter>(value, converter);
 		      _attributes.insert(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Node reading rule
 		    ///
 		    /// Add a node reading rule to reader.
 		    DigraphReader& node(const std::string& caption, Node& node) {
 		      typedef _reader_bits::MapLookUpConverter<Node> Converter;
 		      Converter converter(_node_index);
 		      _reader_bits::ValueStorageBase* storage =
 		        new _reader_bits::ValueStorage<Node, Converter>(node, converter);
 		      _attributes.insert(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Arc reading rule
 		    ///
 		    /// Add an arc reading rule to reader.
 		    DigraphReader& arc(const std::string& caption, Arc& arc) {
 		      typedef _reader_bits::MapLookUpConverter<Arc> Converter;
 		      Converter converter(_arc_index);
 		      _reader_bits::ValueStorageBase* storage =
 		        new _reader_bits::ValueStorage<Arc, Converter>(arc, converter);
 		      _attributes.insert(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// @}
-		    /// \name Select section by name
+		    /// \name Select Section by Name
 		    /// @{
 		    /// \brief Set \c \@nodes section to be read
 		    ///
 		    /// Set \c \@nodes section to be read
 		    DigraphReader& nodes(const std::string& caption) {
 		      _nodes_caption = caption;
 		      return *this;
+		    }
 		    /// \brief Set \c \@arcs section to be read
 		    ///
 		    /// Set \c \@arcs section to be read
 		    DigraphReader& arcs(const std::string& caption) {
 		      _arcs_caption = caption;
 		      return *this;
+		    }
 		    /// \brief Set \c \@attributes section to be read
 		    ///
 		    /// Set \c \@attributes section to be read
 		    DigraphReader& attributes(const std::string& caption) {
 		      _attributes_caption = caption;
 		      return *this;
+		    }
 		    /// @}
-		    /// \name Using previously constructed node or arc set
+		    /// \name Using Previously Constructed Node or Arc Set
 		    /// @{
 		    /// \brief Use previously constructed node set
 		    ///
 		    /// Use previously constructed node set, and specify the node
 		    /// label map.
 		    template <typename Map>
 		    DigraphReader& useNodes(const Map& map) {
 		      checkConcept<concepts::ReadMap<Node, typename Map::Value>, Map>();
 		      LEMON_ASSERT(!_use_nodes, "Multiple usage of useNodes() member");
 		      _use_nodes = true;
 		      _writer_bits::DefaultConverter<typename Map::Value> converter;
 		      for (NodeIt n(_digraph); n != INVALID; ++n) {
 		        _node_index.insert(std::make_pair(converter(map[n]), n));
+		      }
 		      return *this;
+		    }
 		    /// \brief Use previously constructed node set
 		    ///
 		    /// Use previously constructed node set, and specify the node
 		    /// label map and a functor which converts the label map values to
 		    /// \c std::string.
 		    template <typename Map, typename Converter>
 		    DigraphReader& useNodes(const Map& map,
 		                            const Converter& converter = Converter()) {
 		      checkConcept<concepts::ReadMap<Node, typename Map::Value>, Map>();
 		      LEMON_ASSERT(!_use_nodes, "Multiple usage of useNodes() member");
 		      _use_nodes = true;
 		      for (NodeIt n(_digraph); n != INVALID; ++n) {
 		        _node_index.insert(std::make_pair(converter(map[n]), n));
+		      }
 		      return *this;
+		    }
 		    /// \brief Use previously constructed arc set
 		    ///
 		    /// Use previously constructed arc set, and specify the arc
 		    /// label map.
 		    template <typename Map>
 		    DigraphReader& useArcs(const Map& map) {
 		      checkConcept<concepts::ReadMap<Arc, typename Map::Value>, Map>();
 		      LEMON_ASSERT(!_use_arcs, "Multiple usage of useArcs() member");
 		      _use_arcs = true;
 		      _writer_bits::DefaultConverter<typename Map::Value> converter;
 		      for (ArcIt a(_digraph); a != INVALID; ++a) {
 		        _arc_index.insert(std::make_pair(converter(map[a]), a));
+		      }
 		      return *this;
+		    }
 		    /// \brief Use previously constructed arc set
 		    ///
 		    /// Use previously constructed arc set, and specify the arc
 		    /// label map and a functor which converts the label map values to
 		    /// \c std::string.
 		    template <typename Map, typename Converter>
 		    DigraphReader& useArcs(const Map& map,
 		                           const Converter& converter = Converter()) {
 		      checkConcept<concepts::ReadMap<Arc, typename Map::Value>, Map>();
 		      LEMON_ASSERT(!_use_arcs, "Multiple usage of useArcs() member");
 		      _use_arcs = true;
 		      for (ArcIt a(_digraph); a != INVALID; ++a) {
 		        _arc_index.insert(std::make_pair(converter(map[a]), a));
+		      }
 		      return *this;
+		    }
 		    /// \brief Skips the reading of node section
 		    ///
 		    /// Omit the reading of the node section. This implies that each node
 		    /// map reading rule will be abandoned, and the nodes of the graph
 		    /// will not be constructed, which usually cause that the arc set
 		    /// could not be read due to lack of node name resolving.
 		    /// Therefore \c skipArcs() function should also be used, or
 		    /// \c useNodes() should be used to specify the label of the nodes.
 		    DigraphReader& skipNodes() {
 		      LEMON_ASSERT(!_skip_nodes, "Skip nodes already set");
 		      _skip_nodes = true;
 		      return *this;
+		    }
 		    /// \brief Skips the reading of arc section
 		    ///
 		    /// Omit the reading of the arc section. This implies that each arc
 		    /// map reading rule will be abandoned, and the arcs of the graph
 		    /// will not be constructed.
 		    DigraphReader& skipArcs() {
 		      LEMON_ASSERT(!_skip_arcs, "Skip arcs already set");
 		      _skip_arcs = true;
 		      return *this;
+		    }
 		    /// @}
 		  private:
 		    bool readLine() {
 		      std::string str;
 		      while(++line_num, std::getline(*_is, str)) {
 		        line.clear(); line.str(str);
 		        char c;
 		        if (line >> std::ws >> c && c != '#') {
 		          line.putback(c);
 		          return true;
+		        }
+		      }
 		      return false;
+		    }
 		    bool readSuccess() {
 		      return static_cast<bool>(*_is);
+		    }
 		    void skipSection() {
 		      char c;
 		      while (readSuccess() && line >> c && c != '@') {
 		        readLine();
+		      }
 		      if (readSuccess()) {
 		        line.putback(c);
+		      }
+		    }
 		    void readNodes() {
 		      std::vector<int> map_index(_node_maps.size());
 		      int map_num, label_index;
 		      char c;
 		      if (!readLine() || !(line >> c) || c == '@') {
 		        if (readSuccess() && line) line.putback(c);
 		        if (!_node_maps.empty())
 		          throw FormatError("Cannot find map names");
 		        return;
+		      }
 		      line.putback(c);
+		      {
 		        std::map<std::string, int> maps;
 		        std::string map;
 		        int index = 0;
 		        while (_reader_bits::readToken(line, map)) {
 		          if (maps.find(map) != maps.end()) {
 		            std::ostringstream msg;
 		            msg << "Multiple occurence of node map: " << map;
 		            throw FormatError(msg.str());
+		          }
 		          maps.insert(std::make_pair(map, index));
 		          ++index;
+		        }
 		        for (int i = 0; i < static_cast<int>(_node_maps.size()); ++i) {
 		          std::map<std::string, int>::iterator jt =
 		            maps.find(_node_maps[i].first);
 		          if (jt == maps.end()) {
 		            std::ostringstream msg;
 		            msg << "Map not found: " << _node_maps[i].first;
 		            throw FormatError(msg.str());
+		          }
 		          map_index[i] = jt->second;
+		        }
+		        {
 		          std::map<std::string, int>::iterator jt = maps.find("label");
 		          if (jt != maps.end()) {
 		            label_index = jt->second;
 		          } else {
 		            label_index = -1;
+		          }
+		        }
 		        map_num = maps.size();
+		      }
 		      while (readLine() && line >> c && c != '@') {
 		        line.putback(c);
 		        std::vector<std::string> tokens(map_num);
 		        for (int i = 0; i < map_num; ++i) {
 		          if (!_reader_bits::readToken(line, tokens[i])) {
 		            std::ostringstream msg;
 		            msg << "Column not found (" << i + 1 << ")";
 		            throw FormatError(msg.str());
+		          }
+		        }
 		        if (line >> std::ws >> c)
 		          throw FormatError("Extra character at the end of line");
 		        Node n;
 		        if (!_use_nodes) {
 		          n = _digraph.addNode();
 		          if (label_index != -1)
 		            _node_index.insert(std::make_pair(tokens[label_index], n));
 		        } else {
 		          if (label_index == -1)
 		            throw FormatError("Label map not found");
 		          typename std::map<std::string, Node>::iterator it =
 		            _node_index.find(tokens[label_index]);
 		          if (it == _node_index.end()) {
 		            std::ostringstream msg;
 		            msg << "Node with label not found: " << tokens[label_index];
 		            throw FormatError(msg.str());
+		          }
 		          n = it->second;
+		        }
 		        for (int i = 0; i < static_cast<int>(_node_maps.size()); ++i) {
 		          _node_maps[i].second->set(n, tokens[map_index[i]]);
+		        }
+		      }
 		      if (readSuccess()) {
 		        line.putback(c);
+		      }
+		    }
 		    void readArcs() {
 		      std::vector<int> map_index(_arc_maps.size());
 		      int map_num, label_index;
 		      char c;
 		      if (!readLine() || !(line >> c) || c == '@') {
 		        if (readSuccess() && line) line.putback(c);
 		        if (!_arc_maps.empty())
 		          throw FormatError("Cannot find map names");
 		        return;
+		      }
 		      line.putback(c);
+		      {
 		        std::map<std::string, int> maps;
 		        std::string map;
 		        int index = 0;
 		        while (_reader_bits::readToken(line, map)) {
 		          if (maps.find(map) != maps.end()) {
 		            std::ostringstream msg;
 		            msg << "Multiple occurence of arc map: " << map;
 		            throw FormatError(msg.str());
+		          }
 		          maps.insert(std::make_pair(map, index));
 		          ++index;
+		        }
 		        for (int i = 0; i < static_cast<int>(_arc_maps.size()); ++i) {
 		          std::map<std::string, int>::iterator jt =
 		            maps.find(_arc_maps[i].first);
 		          if (jt == maps.end()) {
 		            std::ostringstream msg;
 		            msg << "Map not found: " << _arc_maps[i].first;
 		            throw FormatError(msg.str());
+		          }
 		          map_index[i] = jt->second;
+		        }
+		        {
 		          std::map<std::string, int>::iterator jt = maps.find("label");
 		          if (jt != maps.end()) {
 		            label_index = jt->second;
 		          } else {
 		            label_index = -1;
+		          }
+		        }
 		        map_num = maps.size();
+		      }
 		      while (readLine() && line >> c && c != '@') {
 		        line.putback(c);
 		        std::string source_token;
 		        std::string target_token;
 		        if (!_reader_bits::readToken(line, source_token))
 		          throw FormatError("Source not found");
 		        if (!_reader_bits::readToken(line, target_token))
 		          throw FormatError("Target not found");
 		        std::vector<std::string> tokens(map_num);
 		        for (int i = 0; i < map_num; ++i) {
 		          if (!_reader_bits::readToken(line, tokens[i])) {
 		            std::ostringstream msg;
 		            msg << "Column not found (" << i + 1 << ")";
 		            throw FormatError(msg.str());
+		          }
+		        }
 		        if (line >> std::ws >> c)
 		          throw FormatError("Extra character at the end of line");
 		        Arc a;
 		        if (!_use_arcs) {
 		          typename NodeIndex::iterator it;
 		          it = _node_index.find(source_token);
 		          if (it == _node_index.end()) {
 		            std::ostringstream msg;
 		            msg << "Item not found: " << source_token;
 		            throw FormatError(msg.str());
+		          }
 		          Node source = it->second;
 		          it = _node_index.find(target_token);
 		          if (it == _node_index.end()) {
 		            std::ostringstream msg;
 		            msg << "Item not found: " << target_token;
 		            throw FormatError(msg.str());
+		          }
 		          Node target = it->second;
 		          a = _digraph.addArc(source, target);
 		          if (label_index != -1)
 		            _arc_index.insert(std::make_pair(tokens[label_index], a));
 		        } else {
 		          if (label_index == -1)
 		            throw FormatError("Label map not found");
 		          typename std::map<std::string, Arc>::iterator it =
 		            _arc_index.find(tokens[label_index]);
 		          if (it == _arc_index.end()) {
 		            std::ostringstream msg;
 		            msg << "Arc with label not found: " << tokens[label_index];
 		            throw FormatError(msg.str());
+		          }
 		          a = it->second;
+		        }
 		        for (int i = 0; i < static_cast<int>(_arc_maps.size()); ++i) {
 		          _arc_maps[i].second->set(a, tokens[map_index[i]]);
+		        }
+		      }
 		      if (readSuccess()) {
 		        line.putback(c);
+		      }
+		    }
 		    void readAttributes() {
 		      std::set<std::string> read_attr;
 		      char c;
 		      while (readLine() && line >> c && c != '@') {
 		        line.putback(c);
 		        std::string attr, token;
 		        if (!_reader_bits::readToken(line, attr))
 		          throw FormatError("Attribute name not found");
 		        if (!_reader_bits::readToken(line, token))
 		          throw FormatError("Attribute value not found");
 		        if (line >> c)
 		          throw FormatError("Extra character at the end of line");
+		        {
 		          std::set<std::string>::iterator it = read_attr.find(attr);
 		          if (it != read_attr.end()) {
 		            std::ostringstream msg;
 		            msg << "Multiple occurence of attribute: " << attr;
 		            throw FormatError(msg.str());
+		          }
 		          read_attr.insert(attr);
+		        }
+		        {
 		          typename Attributes::iterator it = _attributes.lower_bound(attr);
 		          while (it != _attributes.end() && it->first == attr) {
 		            it->second->set(token);
 		            ++it;
+		          }
+		        }
+		      }
 		      if (readSuccess()) {
 		        line.putback(c);
+		      }
 		      for (typename Attributes::iterator it = _attributes.begin();
 		           it != _attributes.end(); ++it) {
 		        if (read_attr.find(it->first) == read_attr.end()) {
 		          std::ostringstream msg;
 		          msg << "Attribute not found: " << it->first;
 		          throw FormatError(msg.str());
+		        }
+		      }
+		    }
 		  public:
-		    /// \name Execution of the reader
+		    /// \name Execution of the Reader
 		    /// @{
 		    /// \brief Start the batch processing
 		    ///
 		    /// This function starts the batch processing
 		    void run() {
 		      LEMON_ASSERT(_is != 0, "This reader assigned to an other reader");
 		      bool nodes_done = _skip_nodes;
 		      bool arcs_done = _skip_arcs;
 		      bool attributes_done = false;
 		      line_num = 0;
 		      readLine();
 		      skipSection();
 		      while (readSuccess()) {
 		        try {
 		          char c;
 		          std::string section, caption;
 		          line >> c;
 		          _reader_bits::readToken(line, section);
 		          _reader_bits::readToken(line, caption);
 		          if (line >> c)
 		            throw FormatError("Extra character at the end of line");
 		          if (section == "nodes" && !nodes_done) {
 		            if (_nodes_caption.empty() || _nodes_caption == caption) {
 		              readNodes();
 		              nodes_done = true;
+		            }
 		          } else if ((section == "arcs" || section == "edges") &&
 		                     !arcs_done) {
 		            if (_arcs_caption.empty() || _arcs_caption == caption) {
 		              readArcs();
 		              arcs_done = true;
+		            }
 		          } else if (section == "attributes" && !attributes_done) {
 		            if (_attributes_caption.empty() || _attributes_caption == caption) {
 		              readAttributes();
 		              attributes_done = true;
+		            }
 		          } else {
 		            readLine();
 		            skipSection();
+		          }
 		        } catch (FormatError& error) {
 		          error.line(line_num);
 		          error.file(_filename);
 		          throw;
+		        }
+		      }
 		      if (!nodes_done) {
 		        throw FormatError("Section @nodes not found");
+		      }
 		      if (!arcs_done) {
 		        throw FormatError("Section @arcs not found");
+		      }
 		      if (!attributes_done && !_attributes.empty()) {
 		        throw FormatError("Section @attributes not found");
+		      }
+		    }
 		    /// @}
 		  };
 		  /// \brief Return a \ref DigraphReader class
 		  ///
 		  /// This function just returns a \ref DigraphReader class.
 		  /// \relates DigraphReader
 		  template <typename Digraph>
 		  DigraphReader<Digraph> digraphReader(Digraph& digraph, std::istream& is) {
 		    DigraphReader<Digraph> tmp(digraph, is);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref DigraphReader class
 		  ///
 		  /// This function just returns a \ref DigraphReader class.
 		  /// \relates DigraphReader
 		  template <typename Digraph>
 		  DigraphReader<Digraph> digraphReader(Digraph& digraph,
 		                                       const std::string& fn) {
 		    DigraphReader<Digraph> tmp(digraph, fn);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref DigraphReader class
 		  ///
 		  /// This function just returns a \ref DigraphReader class.
 		  /// \relates DigraphReader
 		  template <typename Digraph>
 		  DigraphReader<Digraph> digraphReader(Digraph& digraph, const char* fn) {
 		    DigraphReader<Digraph> tmp(digraph, fn);
 		    return tmp;
+		  }
 		  template <typename Graph>
 		  class GraphReader;
 		  template <typename Graph>
 		  GraphReader<Graph> graphReader(Graph& graph,
 		                                 std::istream& is = std::cin);
 		  template <typename Graph>
 		  GraphReader<Graph> graphReader(Graph& graph, const std::string& fn);
 		  template <typename Graph>
 		  GraphReader<Graph> graphReader(Graph& graph, const char *fn);
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief \ref lgf-format "LGF" reader for undirected graphs
 		  ///
 		  /// This utility reads an \ref lgf-format "LGF" file.
 		  ///
 		  /// It can be used almost the same way as \c DigraphReader.
 		  /// The only difference is that this class can handle edges and
 		  /// edge maps as well as arcs and arc maps.
 		  ///
 		  /// The columns in the \c \@edges (or \c \@arcs) section are the
 		  /// edge maps. However, if there are two maps with the same name
 		  /// prefixed with \c '+' and \c '-', then these can be read into an
 		  /// arc map.  Similarly, an attribute can be read into an arc, if
 		  /// it's value is an edge label prefixed with \c '+' or \c '-'.
 		  template <typename GR>
 		  class GraphReader {
 		  public:
 		    typedef GR Graph;
 		  private:
 		    TEMPLATE_GRAPH_TYPEDEFS(Graph);
 		    std::istream* _is;
 		    bool local_is;
 		    std::string _filename;
 		    Graph& _graph;
 		    std::string _nodes_caption;
 		    std::string _edges_caption;
 		    std::string _attributes_caption;
 		    typedef std::map<std::string, Node> NodeIndex;
 		    NodeIndex _node_index;
 		    typedef std::map<std::string, Edge> EdgeIndex;
 		    EdgeIndex _edge_index;
 		    typedef std::vector<std::pair<std::string,
 		      _reader_bits::MapStorageBase<Node>*> > NodeMaps;
 		    NodeMaps _node_maps;
 		    typedef std::vector<std::pair<std::string,
 		      _reader_bits::MapStorageBase<Edge>*> > EdgeMaps;
 		    EdgeMaps _edge_maps;
 		    typedef std::multimap<std::string, _reader_bits::ValueStorageBase*>
 		      Attributes;
 		    Attributes _attributes;
 		    bool _use_nodes;
 		    bool _use_edges;
 		    bool _skip_nodes;
 		    bool _skip_edges;
 		    int line_num;
 		    std::istringstream line;
 		  public:
 		    /// \brief Constructor
 		    ///
 		    /// Construct an undirected graph reader, which reads from the given
 		    /// input stream.
 		    GraphReader(Graph& graph, std::istream& is = std::cin)
 		      : _is(&is), local_is(false), _graph(graph),
 		        _use_nodes(false), _use_edges(false),
 		        _skip_nodes(false), _skip_edges(false) {}
 		    /// \brief Constructor
 		    ///
 		    /// Construct an undirected graph reader, which reads from the given
 		    /// file.
 		    GraphReader(Graph& graph, const std::string& fn)
 		      : _is(new std::ifstream(fn.c_str())), local_is(true),
 		        _filename(fn), _graph(graph),
 		        _use_nodes(false), _use_edges(false),
 		        _skip_nodes(false), _skip_edges(false) {
 		      if (!(*_is)) {
 		        delete _is;
 		        throw IoError("Cannot open file", fn);
+		      }
+		    }
 		    /// \brief Constructor
 		    ///
 		    /// Construct an undirected graph reader, which reads from the given
 		    /// file.
 		    GraphReader(Graph& graph, const char* fn)
 		      : _is(new std::ifstream(fn)), local_is(true),
 		        _filename(fn), _graph(graph),
 		        _use_nodes(false), _use_edges(false),
 		        _skip_nodes(false), _skip_edges(false) {
 		      if (!(*_is)) {
 		        delete _is;
 		        throw IoError("Cannot open file", fn);
+		      }
+		    }
 		    /// \brief Destructor
 		    ~GraphReader() {
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        delete it->second;
+		      }
 		      for (typename EdgeMaps::iterator it = _edge_maps.begin();
 		           it != _edge_maps.end(); ++it) {
 		        delete it->second;
+		      }
 		      for (typename Attributes::iterator it = _attributes.begin();
 		           it != _attributes.end(); ++it) {
 		        delete it->second;
+		      }
 		      if (local_is) {
 		        delete _is;
+		      }
+		    }
 		  private:
 		    template <typename Graph>
 		    friend GraphReader<Graph> graphReader(Graph& graph, std::istream& is);
 		    template <typename Graph>
 		    friend GraphReader<Graph> graphReader(Graph& graph, const std::string& fn);
 		    template <typename Graph>
 		    friend GraphReader<Graph> graphReader(Graph& graph, const char *fn);
 		    GraphReader(GraphReader& other)
 		      : _is(other._is), local_is(other.local_is), _graph(other._graph),
 		        _use_nodes(other._use_nodes), _use_edges(other._use_edges),
 		        _skip_nodes(other._skip_nodes), _skip_edges(other._skip_edges) {
 		      other._is = 0;
 		      other.local_is = false;
 		      _node_index.swap(other._node_index);
 		      _edge_index.swap(other._edge_index);
 		      _node_maps.swap(other._node_maps);
 		      _edge_maps.swap(other._edge_maps);
 		      _attributes.swap(other._attributes);
 		      _nodes_caption = other._nodes_caption;
 		      _edges_caption = other._edges_caption;
 		      _attributes_caption = other._attributes_caption;
+		    }
 		    GraphReader& operator=(const GraphReader&);
 		  public:
-		    /// \name Reading rules
+		    /// \name Reading Rules
 		    /// @{
 		    /// \brief Node map reading rule
 		    ///
 		    /// Add a node map reading rule to the reader.
 		    template <typename Map>
 		    GraphReader& nodeMap(const std::string& caption, Map& map) {
 		      checkConcept<concepts::WriteMap<Node, typename Map::Value>, Map>();
 		      _reader_bits::MapStorageBase<Node>* storage =
 		        new _reader_bits::MapStorage<Node, Map>(map);
 		      _node_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Node map reading rule
 		    ///
 		    /// Add a node map reading rule with specialized converter to the
 		    /// reader.
 		    template <typename Map, typename Converter>
 		    GraphReader& nodeMap(const std::string& caption, Map& map,
 		                           const Converter& converter = Converter()) {
 		      checkConcept<concepts::WriteMap<Node, typename Map::Value>, Map>();
 		      _reader_bits::MapStorageBase<Node>* storage =
 		        new _reader_bits::MapStorage<Node, Map, Converter>(map, converter);
 		      _node_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Edge map reading rule
 		    ///
 		    /// Add an edge map reading rule to the reader.
 		    template <typename Map>
 		    GraphReader& edgeMap(const std::string& caption, Map& map) {
 		      checkConcept<concepts::WriteMap<Edge, typename Map::Value>, Map>();
 		      _reader_bits::MapStorageBase<Edge>* storage =
 		        new _reader_bits::MapStorage<Edge, Map>(map);
 		      _edge_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Edge map reading rule
 		    ///
 		    /// Add an edge map reading rule with specialized converter to the
 		    /// reader.
 		    template <typename Map, typename Converter>
 		    GraphReader& edgeMap(const std::string& caption, Map& map,
 		                          const Converter& converter = Converter()) {
 		      checkConcept<concepts::WriteMap<Edge, typename Map::Value>, Map>();
 		      _reader_bits::MapStorageBase<Edge>* storage =
 		        new _reader_bits::MapStorage<Edge, Map, Converter>(map, converter);
 		      _edge_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Arc map reading rule
 		    ///
 		    /// Add an arc map reading rule to the reader.
 		    template <typename Map>
 		    GraphReader& arcMap(const std::string& caption, Map& map) {
 		      checkConcept<concepts::WriteMap<Arc, typename Map::Value>, Map>();
 		      _reader_bits::MapStorageBase<Edge>* forward_storage =
 		        new _reader_bits::GraphArcMapStorage<Graph, true, Map>(_graph, map);
 		      _edge_maps.push_back(std::make_pair('+' + caption, forward_storage));
 		      _reader_bits::MapStorageBase<Edge>* backward_storage =
 		        new _reader_bits::GraphArcMapStorage<Graph, false, Map>(_graph, map);
 		      _edge_maps.push_back(std::make_pair('-' + caption, backward_storage));
 		      return *this;
+		    }
 		    /// \brief Arc map reading rule
 		    ///
 		    /// Add an arc map reading rule with specialized converter to the
 		    /// reader.
 		    template <typename Map, typename Converter>
 		    GraphReader& arcMap(const std::string& caption, Map& map,
 		                          const Converter& converter = Converter()) {
 		      checkConcept<concepts::WriteMap<Arc, typename Map::Value>, Map>();
 		      _reader_bits::MapStorageBase<Edge>* forward_storage =
 		        new _reader_bits::GraphArcMapStorage<Graph, true, Map, Converter>
 		        (_graph, map, converter);
 		      _edge_maps.push_back(std::make_pair('+' + caption, forward_storage));
 		      _reader_bits::MapStorageBase<Edge>* backward_storage =
 		        new _reader_bits::GraphArcMapStorage<Graph, false, Map, Converter>
 		        (_graph, map, converter);
 		      _edge_maps.push_back(std::make_pair('-' + caption, backward_storage));
 		      return *this;
+		    }
 		    /// \brief Attribute reading rule
 		    ///
 		    /// Add an attribute reading rule to the reader.
 		    template <typename Value>
 		    GraphReader& attribute(const std::string& caption, Value& value) {
 		      _reader_bits::ValueStorageBase* storage =
 		        new _reader_bits::ValueStorage<Value>(value);
 		      _attributes.insert(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Attribute reading rule
 		    ///
 		    /// Add an attribute reading rule with specialized converter to the
 		    /// reader.
 		    template <typename Value, typename Converter>
 		    GraphReader& attribute(const std::string& caption, Value& value,
 		                             const Converter& converter = Converter()) {
 		      _reader_bits::ValueStorageBase* storage =
 		        new _reader_bits::ValueStorage<Value, Converter>(value, converter);
 		      _attributes.insert(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Node reading rule
 		    ///
 		    /// Add a node reading rule to reader.
 		    GraphReader& node(const std::string& caption, Node& node) {
 		      typedef _reader_bits::MapLookUpConverter<Node> Converter;
 		      Converter converter(_node_index);
 		      _reader_bits::ValueStorageBase* storage =
 		        new _reader_bits::ValueStorage<Node, Converter>(node, converter);
 		      _attributes.insert(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Edge reading rule
 		    ///
 		    /// Add an edge reading rule to reader.
 		    GraphReader& edge(const std::string& caption, Edge& edge) {
 		      typedef _reader_bits::MapLookUpConverter<Edge> Converter;
 		      Converter converter(_edge_index);
 		      _reader_bits::ValueStorageBase* storage =
 		        new _reader_bits::ValueStorage<Edge, Converter>(edge, converter);
 		      _attributes.insert(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Arc reading rule
 		    ///
 		    /// Add an arc reading rule to reader.
 		    GraphReader& arc(const std::string& caption, Arc& arc) {
 		      typedef _reader_bits::GraphArcLookUpConverter<Graph> Converter;
 		      Converter converter(_graph, _edge_index);
 		      _reader_bits::ValueStorageBase* storage =
 		        new _reader_bits::ValueStorage<Arc, Converter>(arc, converter);
 		      _attributes.insert(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// @}
-		    /// \name Select section by name
+		    /// \name Select Section by Name
 		    /// @{
 		    /// \brief Set \c \@nodes section to be read
 		    ///
 		    /// Set \c \@nodes section to be read.
 		    GraphReader& nodes(const std::string& caption) {
 		      _nodes_caption = caption;
 		      return *this;
+		    }
 		    /// \brief Set \c \@edges section to be read
 		    ///
 		    /// Set \c \@edges section to be read.
 		    GraphReader& edges(const std::string& caption) {
 		      _edges_caption = caption;
 		      return *this;
+		    }
 		    /// \brief Set \c \@attributes section to be read
 		    ///
 		    /// Set \c \@attributes section to be read.
 		    GraphReader& attributes(const std::string& caption) {
 		      _attributes_caption = caption;
 		      return *this;
+		    }
 		    /// @}
-		    /// \name Using previously constructed node or edge set
+		    /// \name Using Previously Constructed Node or Edge Set
 		    /// @{
 		    /// \brief Use previously constructed node set
 		    ///
 		    /// Use previously constructed node set, and specify the node
 		    /// label map.
 		    template <typename Map>
 		    GraphReader& useNodes(const Map& map) {
 		      checkConcept<concepts::ReadMap<Node, typename Map::Value>, Map>();
 		      LEMON_ASSERT(!_use_nodes, "Multiple usage of useNodes() member");
 		      _use_nodes = true;
 		      _writer_bits::DefaultConverter<typename Map::Value> converter;
 		      for (NodeIt n(_graph); n != INVALID; ++n) {
 		        _node_index.insert(std::make_pair(converter(map[n]), n));
+		      }
 		      return *this;
+		    }
 		    /// \brief Use previously constructed node set
 		    ///
 		    /// Use previously constructed node set, and specify the node
 		    /// label map and a functor which converts the label map values to
 		    /// \c std::string.
 		    template <typename Map, typename Converter>
 		    GraphReader& useNodes(const Map& map,
 		                            const Converter& converter = Converter()) {
 		      checkConcept<concepts::ReadMap<Node, typename Map::Value>, Map>();
 		      LEMON_ASSERT(!_use_nodes, "Multiple usage of useNodes() member");
 		      _use_nodes = true;
 		      for (NodeIt n(_graph); n != INVALID; ++n) {
 		        _node_index.insert(std::make_pair(converter(map[n]), n));
+		      }
 		      return *this;
+		    }
 		    /// \brief Use previously constructed edge set
 		    ///
 		    /// Use previously constructed edge set, and specify the edge
 		    /// label map.
 		    template <typename Map>
 		    GraphReader& useEdges(const Map& map) {
 		      checkConcept<concepts::ReadMap<Edge, typename Map::Value>, Map>();
 		      LEMON_ASSERT(!_use_edges, "Multiple usage of useEdges() member");
 		      _use_edges = true;
 		      _writer_bits::DefaultConverter<typename Map::Value> converter;
 		      for (EdgeIt a(_graph); a != INVALID; ++a) {
 		        _edge_index.insert(std::make_pair(converter(map[a]), a));
+		      }
 		      return *this;
+		    }
 		    /// \brief Use previously constructed edge set
 		    ///
 		    /// Use previously constructed edge set, and specify the edge
 		    /// label map and a functor which converts the label map values to
 		    /// \c std::string.
 		    template <typename Map, typename Converter>
 		    GraphReader& useEdges(const Map& map,
 		                            const Converter& converter = Converter()) {
 		      checkConcept<concepts::ReadMap<Edge, typename Map::Value>, Map>();
 		      LEMON_ASSERT(!_use_edges, "Multiple usage of useEdges() member");
 		      _use_edges = true;
 		      for (EdgeIt a(_graph); a != INVALID; ++a) {
 		        _edge_index.insert(std::make_pair(converter(map[a]), a));
+		      }
 		      return *this;
+		    }
 		    /// \brief Skip the reading of node section
 		    ///
 		    /// Omit the reading of the node section. This implies that each node
 		    /// map reading rule will be abandoned, and the nodes of the graph
 		    /// will not be constructed, which usually cause that the edge set
 		    /// could not be read due to lack of node name
 		    /// could not be read due to lack of node name resolving.
 		    /// Therefore \c skipEdges() function should also be used, or
 		    /// \c useNodes() should be used to specify the label of the nodes.
 		    GraphReader& skipNodes() {
 		      LEMON_ASSERT(!_skip_nodes, "Skip nodes already set");
 		      _skip_nodes = true;
 		      return *this;
+		    }
 		    /// \brief Skip the reading of edge section
 		    ///
 		    /// Omit the reading of the edge section. This implies that each edge
 		    /// map reading rule will be abandoned, and the edges of the graph
 		    /// will not be constructed.
 		    GraphReader& skipEdges() {
 		      LEMON_ASSERT(!_skip_edges, "Skip edges already set");
 		      _skip_edges = true;
 		      return *this;
+		    }
 		    /// @}
 		  private:
 		    bool readLine() {
 		      std::string str;
 		      while(++line_num, std::getline(*_is, str)) {
 		        line.clear(); line.str(str);
 		        char c;
 		        if (line >> std::ws >> c && c != '#') {
 		          line.putback(c);
 		          return true;
+		        }
+		      }
 		      return false;
+		    }
 		    bool readSuccess() {
 		      return static_cast<bool>(*_is);
+		    }
 		    void skipSection() {
 		      char c;
 		      while (readSuccess() && line >> c && c != '@') {
 		        readLine();
+		      }
 		      if (readSuccess()) {
 		        line.putback(c);
+		      }
+		    }
 		    void readNodes() {
 		      std::vector<int> map_index(_node_maps.size());
 		      int map_num, label_index;
 		      char c;
 		      if (!readLine() || !(line >> c) || c == '@') {
 		        if (readSuccess() && line) line.putback(c);
 		        if (!_node_maps.empty())
 		          throw FormatError("Cannot find map names");
 		        return;
+		      }
 		      line.putback(c);
+		      {
 		        std::map<std::string, int> maps;
 		        std::string map;
 		        int index = 0;
 		        while (_reader_bits::readToken(line, map)) {
 		          if (maps.find(map) != maps.end()) {
 		            std::ostringstream msg;
 		            msg << "Multiple occurence of node map: " << map;
 		            throw FormatError(msg.str());
+		          }
 		          maps.insert(std::make_pair(map, index));
 		          ++index;
+		        }
 		        for (int i = 0; i < static_cast<int>(_node_maps.size()); ++i) {
 		          std::map<std::string, int>::iterator jt =
 		            maps.find(_node_maps[i].first);
 		          if (jt == maps.end()) {
 		            std::ostringstream msg;
 		            msg << "Map not found: " << _node_maps[i].first;
 		            throw FormatError(msg.str());
+		          }
 		          map_index[i] = jt->second;
+		        }
+		        {
 		          std::map<std::string, int>::iterator jt = maps.find("label");
 		          if (jt != maps.end()) {
 		            label_index = jt->second;
 		          } else {
 		            label_index = -1;
+		          }
+		        }
 		        map_num = maps.size();
+		      }
 		      while (readLine() && line >> c && c != '@') {
 		        line.putback(c);
 		        std::vector<std::string> tokens(map_num);
 		        for (int i = 0; i < map_num; ++i) {
 		          if (!_reader_bits::readToken(line, tokens[i])) {
 		            std::ostringstream msg;
 		            msg << "Column not found (" << i + 1 << ")";
 		            throw FormatError(msg.str());
+		          }
+		        }
 		        if (line >> std::ws >> c)
 		          throw FormatError("Extra character at the end of line");
 		        Node n;
 		        if (!_use_nodes) {
 		          n = _graph.addNode();
 		          if (label_index != -1)
 		            _node_index.insert(std::make_pair(tokens[label_index], n));
 		        } else {
 		          if (label_index == -1)
 		            throw FormatError("Label map not found");
 		          typename std::map<std::string, Node>::iterator it =
 		            _node_index.find(tokens[label_index]);
 		          if (it == _node_index.end()) {
 		            std::ostringstream msg;
 		            msg << "Node with label not found: " << tokens[label_index];
 		            throw FormatError(msg.str());
+		          }
 		          n = it->second;
+		        }
 		        for (int i = 0; i < static_cast<int>(_node_maps.size()); ++i) {
 		          _node_maps[i].second->set(n, tokens[map_index[i]]);
+		        }
+		      }
 		      if (readSuccess()) {
 		        line.putback(c);
+		      }
+		    }
 		    void readEdges() {
 		      std::vector<int> map_index(_edge_maps.size());
 		      int map_num, label_index;
 		      char c;
 		      if (!readLine() || !(line >> c) || c == '@') {
 		        if (readSuccess() && line) line.putback(c);
 		        if (!_edge_maps.empty())
 		          throw FormatError("Cannot find map names");
 		        return;
+		      }
 		      line.putback(c);
+		      {
 		        std::map<std::string, int> maps;
 		        std::string map;
 		        int index = 0;
 		        while (_reader_bits::readToken(line, map)) {
 		          if (maps.find(map) != maps.end()) {
 		            std::ostringstream msg;
 		            msg << "Multiple occurence of edge map: " << map;
 		            throw FormatError(msg.str());
+		          }
 		          maps.insert(std::make_pair(map, index));
 		          ++index;
+		        }
 		        for (int i = 0; i < static_cast<int>(_edge_maps.size()); ++i) {
 		          std::map<std::string, int>::iterator jt =
 		            maps.find(_edge_maps[i].first);
 		          if (jt == maps.end()) {
 		            std::ostringstream msg;
 		            msg << "Map not found: " << _edge_maps[i].first;
 		            throw FormatError(msg.str());
+		          }
 		          map_index[i] = jt->second;
+		        }
+		        {
 		          std::map<std::string, int>::iterator jt = maps.find("label");
 		          if (jt != maps.end()) {
 		            label_index = jt->second;
 		          } else {
 		            label_index = -1;
+		          }
+		        }
 		        map_num = maps.size();
+		      }
 		      while (readLine() && line >> c && c != '@') {
 		        line.putback(c);
 		        std::string source_token;
 		        std::string target_token;
 		        if (!_reader_bits::readToken(line, source_token))
 		          throw FormatError("Node u not found");
 		        if (!_reader_bits::readToken(line, target_token))
 		          throw FormatError("Node v not found");
 		        std::vector<std::string> tokens(map_num);
 		        for (int i = 0; i < map_num; ++i) {
 		          if (!_reader_bits::readToken(line, tokens[i])) {
 		            std::ostringstream msg;
 		            msg << "Column not found (" << i + 1 << ")";
 		            throw FormatError(msg.str());
+		          }
+		        }
 		        if (line >> std::ws >> c)
 		          throw FormatError("Extra character at the end of line");
 		        Edge e;
 		        if (!_use_edges) {
 		          typename NodeIndex::iterator it;
 		          it = _node_index.find(source_token);
 		          if (it == _node_index.end()) {
 		            std::ostringstream msg;
 		            msg << "Item not found: " << source_token;
 		            throw FormatError(msg.str());
+		          }
 		          Node source = it->second;
 		          it = _node_index.find(target_token);
 		          if (it == _node_index.end()) {
 		            std::ostringstream msg;
 		            msg << "Item not found: " << target_token;
 		            throw FormatError(msg.str());
+		          }
 		          Node target = it->second;
 		          e = _graph.addEdge(source, target);
 		          if (label_index != -1)
 		            _edge_index.insert(std::make_pair(tokens[label_index], e));
 		        } else {
 		          if (label_index == -1)
 		            throw FormatError("Label map not found");
 		          typename std::map<std::string, Edge>::iterator it =
 		            _edge_index.find(tokens[label_index]);
 		          if (it == _edge_index.end()) {
 		            std::ostringstream msg;
 		            msg << "Edge with label not found: " << tokens[label_index];
 		            throw FormatError(msg.str());
+		          }
 		          e = it->second;
+		        }
 		        for (int i = 0; i < static_cast<int>(_edge_maps.size()); ++i) {
 		          _edge_maps[i].second->set(e, tokens[map_index[i]]);
+		        }
+		      }
 		      if (readSuccess()) {
 		        line.putback(c);
+		      }
+		    }
 		    void readAttributes() {
 		      std::set<std::string> read_attr;
 		      char c;
 		      while (readLine() && line >> c && c != '@') {
 		        line.putback(c);
 		        std::string attr, token;
 		        if (!_reader_bits::readToken(line, attr))
 		          throw FormatError("Attribute name not found");
 		        if (!_reader_bits::readToken(line, token))
 		          throw FormatError("Attribute value not found");
 		        if (line >> c)
 		          throw FormatError("Extra character at the end of line");
+		        {
 		          std::set<std::string>::iterator it = read_attr.find(attr);
 		          if (it != read_attr.end()) {
 		            std::ostringstream msg;
 		            msg << "Multiple occurence of attribute: " << attr;
 		            throw FormatError(msg.str());
+		          }
 		          read_attr.insert(attr);
+		        }
+		        {
 		          typename Attributes::iterator it = _attributes.lower_bound(attr);
 		          while (it != _attributes.end() && it->first == attr) {
 		            it->second->set(token);
 		            ++it;
+		          }
+		        }
+		      }
 		      if (readSuccess()) {
 		        line.putback(c);
+		      }
 		      for (typename Attributes::iterator it = _attributes.begin();
 		           it != _attributes.end(); ++it) {
 		        if (read_attr.find(it->first) == read_attr.end()) {
 		          std::ostringstream msg;
 		          msg << "Attribute not found: " << it->first;
 		          throw FormatError(msg.str());
+		        }
+		      }
+		    }
 		  public:
-		    /// \name Execution of the reader
+		    /// \name Execution of the Reader
 		    /// @{
 		    /// \brief Start the batch processing
 		    ///
 		    /// This function starts the batch processing
 		    void run() {
 		      LEMON_ASSERT(_is != 0, "This reader assigned to an other reader");
 		      bool nodes_done = _skip_nodes;
 		      bool edges_done = _skip_edges;
 		      bool attributes_done = false;
 		      line_num = 0;
 		      readLine();
 		      skipSection();
 		      while (readSuccess()) {
 		        try {
 		          char c;
 		          std::string section, caption;
 		          line >> c;
 		          _reader_bits::readToken(line, section);
 		          _reader_bits::readToken(line, caption);
 		          if (line >> c)
 		            throw FormatError("Extra character at the end of line");
 		          if (section == "nodes" && !nodes_done) {
 		            if (_nodes_caption.empty() || _nodes_caption == caption) {
 		              readNodes();
 		              nodes_done = true;
+		            }
 		          } else if ((section == "edges" || section == "arcs") &&
 		                     !edges_done) {
 		            if (_edges_caption.empty() || _edges_caption == caption) {
 		              readEdges();
 		              edges_done = true;
+		            }
 		          } else if (section == "attributes" && !attributes_done) {
 		            if (_attributes_caption.empty() || _attributes_caption == caption) {
 		              readAttributes();
 		              attributes_done = true;
+		            }
 		          } else {
 		            readLine();
 		            skipSection();
+		          }
 		        } catch (FormatError& error) {
 		          error.line(line_num);
 		          error.file(_filename);
 		          throw;
+		        }
+		      }
 		      if (!nodes_done) {
 		        throw FormatError("Section @nodes not found");
+		      }
 		      if (!edges_done) {
 		        throw FormatError("Section @edges not found");
+		      }
 		      if (!attributes_done && !_attributes.empty()) {
 		        throw FormatError("Section @attributes not found");
+		      }
+		    }
 		    /// @}
 		  };
 		  /// \brief Return a \ref GraphReader class
 		  ///
 		  /// This function just returns a \ref GraphReader class.
 		  /// \relates GraphReader
 		  template <typename Graph>
 		  GraphReader<Graph> graphReader(Graph& graph, std::istream& is) {
 		    GraphReader<Graph> tmp(graph, is);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref GraphReader class
 		  ///
 		  /// This function just returns a \ref GraphReader class.
 		  /// \relates GraphReader
 		  template <typename Graph>
 		  GraphReader<Graph> graphReader(Graph& graph, const std::string& fn) {
 		    GraphReader<Graph> tmp(graph, fn);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref GraphReader class
 		  ///
 		  /// This function just returns a \ref GraphReader class.
 		  /// \relates GraphReader
 		  template <typename Graph>
 		  GraphReader<Graph> graphReader(Graph& graph, const char* fn) {
 		    GraphReader<Graph> tmp(graph, fn);
 		    return tmp;
+		  }
 		  class SectionReader;
 		  SectionReader sectionReader(std::istream& is);
 		  SectionReader sectionReader(const std::string& fn);
 		  SectionReader sectionReader(const char* fn);
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief Section reader class
 		  ///
 		  /// In the \ref lgf-format "LGF" file extra sections can be placed,
 		  /// which contain any data in arbitrary format. Such sections can be
 		  /// read with this class. A reading rule can be added to the class
 		  /// with two different functions. With the \c sectionLines() function a
 		  /// functor can process the section line-by-line, while with the \c
 		  /// sectionStream() member the section can be read from an input
 		  /// stream.
 		  class SectionReader {
 		  private:
 		    std::istream* _is;
 		    bool local_is;
 		    std::string _filename;
 		    typedef std::map<std::string, _reader_bits::Section*> Sections;
 		    Sections _sections;
 		    int line_num;
 		    std::istringstream line;
 		  public:
 		    /// \brief Constructor
 		    ///
 		    /// Construct a section reader, which reads from the given input
 		    /// stream.
 		    SectionReader(std::istream& is)
 		      : _is(&is), local_is(false) {}
 		    /// \brief Constructor
 		    ///
 		    /// Construct a section reader, which reads from the given file.
 		    SectionReader(const std::string& fn)
 		      : _is(new std::ifstream(fn.c_str())), local_is(true),
 		        _filename(fn) {
 		      if (!(*_is)) {
 		        delete _is;
 		        throw IoError("Cannot open file", fn);
+		      }
+		    }
 		    /// \brief Constructor
 		    ///
 		    /// Construct a section reader, which reads from the given file.
 		    SectionReader(const char* fn)
 		      : _is(new std::ifstream(fn)), local_is(true),
 		        _filename(fn) {
 		      if (!(*_is)) {
 		        delete _is;
 		        throw IoError("Cannot open file", fn);
+		      }
+		    }
 		    /// \brief Destructor
 		    ~SectionReader() {
 		      for (Sections::iterator it = _sections.begin();
 		           it != _sections.end(); ++it) {
 		        delete it->second;
+		      }
 		      if (local_is) {
 		        delete _is;
+		      }
+		    }
 		  private:
 		    friend SectionReader sectionReader(std::istream& is);
 		    friend SectionReader sectionReader(const std::string& fn);
 		    friend SectionReader sectionReader(const char* fn);
 		    SectionReader(SectionReader& other)
 		      : _is(other._is), local_is(other.local_is) {
 		      other._is = 0;
 		      other.local_is = false;
 		      _sections.swap(other._sections);
+		    }
 		    SectionReader& operator=(const SectionReader&);
 		  public:
-		    /// \name Section readers
+		    /// \name Section Readers
 		    /// @{
 		    /// \brief Add a section processor with line oriented reading
 		    ///
 		    /// The first parameter is the type descriptor of the section, the
 		    /// second is a functor, which takes just one \c std::string
 		    /// parameter. At the reading process, each line of the section
 		    /// will be given to the functor object. However, the empty lines
 		    /// and the comment lines are filtered out, and the leading
 		    /// whitespaces are trimmed from each processed string.
 		    ///
 		    /// For example let's see a section, which contain several
 		    /// integers, which should be inserted into a vector.
 		    ///\code
 		    ///  @numbers
 		    ///  12 45 23
 		    ///  4
 		    ///  23 6
 		    ///\endcode
 		    ///
 		    /// The functor is implemented as a struct:
 		    ///\code
 		    ///  struct NumberSection {
 		    ///    std::vector<int>& _data;
 		    ///    NumberSection(std::vector<int>& data) : _data(data) {}
 		    ///    void operator()(const std::string& line) {
 		    ///      std::istringstream ls(line);
 		    ///      int value;
 		    ///      while (ls >> value) _data.push_back(value);
 		    ///    }
 		    ///  };
 		    ///
 		    ///  // ...
 		    ///
 		    ///  reader.sectionLines("numbers", NumberSection(vec));
 		    ///\endcode
 		    template <typename Functor>
 		    SectionReader& sectionLines(const std::string& type, Functor functor) {
 		      LEMON_ASSERT(!type.empty(), "Type is empty.");
 		      LEMON_ASSERT(_sections.find(type) == _sections.end(),
 		                   "Multiple reading of section.");
 		      _sections.insert(std::make_pair(type,
 		        new _reader_bits::LineSection<Functor>(functor)));
 		      return *this;
+		    }
 		    /// \brief Add a section processor with stream oriented reading
 		    ///
 		    /// The first parameter is the type of the section, the second is
 		    /// a functor, which takes an \c std::istream& and an \c int&
 		    /// parameter, the latter regard to the line number of stream. The
 		    /// functor can read the input while the section go on, and the
 		    /// line number should be modified accordingly.
 		    template <typename Functor>
 		    SectionReader& sectionStream(const std::string& type, Functor functor) {
 		      LEMON_ASSERT(!type.empty(), "Type is empty.");
 		      LEMON_ASSERT(_sections.find(type) == _sections.end(),
 		                   "Multiple reading of section.");
 		      _sections.insert(std::make_pair(type,
 		         new _reader_bits::StreamSection<Functor>(functor)));
 		      return *this;
+		    }
 		    /// @}
 		  private:
 		    bool readLine() {
 		      std::string str;
 		      while(++line_num, std::getline(*_is, str)) {
 		        line.clear(); line.str(str);
 		        char c;
 		        if (line >> std::ws >> c && c != '#') {
 		          line.putback(c);
 		          return true;
+		        }
+		      }
 		      return false;
+		    }
 		    bool readSuccess() {
 		      return static_cast<bool>(*_is);
+		    }
 		    void skipSection() {
 		      char c;
 		      while (readSuccess() && line >> c && c != '@') {
 		        readLine();
+		      }
 		      if (readSuccess()) {
 		        line.putback(c);
+		      }
+		    }
 		  public:
-		    /// \name Execution of the reader
+		    /// \name Execution of the Reader
 		    /// @{
 		    /// \brief Start the batch processing
 		    ///
 		    /// This function starts the batch processing.
 		    void run() {
 		      LEMON_ASSERT(_is != 0, "This reader assigned to an other reader");
 		      std::set<std::string> extra_sections;
 		      line_num = 0;
 		      readLine();
 		      skipSection();
 		      while (readSuccess()) {
 		        try {
 		          char c;
 		          std::string section, caption;
 		          line >> c;
 		          _reader_bits::readToken(line, section);
 		          _reader_bits::readToken(line, caption);
 		          if (line >> c)
 		            throw FormatError("Extra character at the end of line");
 		          if (extra_sections.find(section) != extra_sections.end()) {
 		            std::ostringstream msg;
 		            msg << "Multiple occurence of section: " << section;
 		            throw FormatError(msg.str());
+		          }
 		          Sections::iterator it = _sections.find(section);
 		          if (it != _sections.end()) {
 		            extra_sections.insert(section);
 		            it->second->process(*_is, line_num);
+		          }
 		          readLine();
 		          skipSection();
 		        } catch (FormatError& error) {
 		          error.line(line_num);
 		          error.file(_filename);
 		          throw;
+		        }
+		      }
 		      for (Sections::iterator it = _sections.begin();
 		           it != _sections.end(); ++it) {
 		        if (extra_sections.find(it->first) == extra_sections.end()) {
 		          std::ostringstream os;
 		          os << "Cannot find section: " << it->first;
 		          throw FormatError(os.str());
+		        }
+		      }
+		    }
 		    /// @}
 		  };
 		  /// \brief Return a \ref SectionReader class
 		  ///
 		  /// This function just returns a \ref SectionReader class.
 		  /// \relates SectionReader
 		  inline SectionReader sectionReader(std::istream& is) {
 		    SectionReader tmp(is);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref SectionReader class
 		  ///
 		  /// This function just returns a \ref SectionReader class.
 		  /// \relates SectionReader
 		  inline SectionReader sectionReader(const std::string& fn) {
 		    SectionReader tmp(fn);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref SectionReader class
 		  ///
 		  /// This function just returns a \ref SectionReader class.
 		  /// \relates SectionReader
 		  inline SectionReader sectionReader(const char* fn) {
 		    SectionReader tmp(fn);
 		    return tmp;
+		  }
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief Reader for the contents of the \ref lgf-format "LGF" file
 		  ///
 		  /// This class can be used to read the sections, the map names and
 		  /// the attributes from a file. Usually, the LEMON programs know
 		  /// that, which type of graph, which maps and which attributes
 		  /// should be read from a file, but in general tools (like glemon)
 		  /// the contents of an LGF file should be guessed somehow. This class
 		  /// reads the graph and stores the appropriate information for
 		  /// reading the graph.
 		  ///
 		  ///\code
 		  /// LgfContents contents("graph.lgf");
 		  /// contents.run();
 		  ///
 		  /// // Does it contain any node section and arc section?
 		  /// if (contents.nodeSectionNum() == 0 || contents.arcSectionNum()) {
 		  ///   std::cerr << "Failure, cannot find graph." << std::endl;
 		  ///   return -1;
 		  /// }
 		  /// std::cout << "The name of the default node section: "
 		  ///           << contents.nodeSection(0) << std::endl;
 		  /// std::cout << "The number of the arc maps: "
 		  ///           << contents.arcMaps(0).size() << std::endl;
 		  /// std::cout << "The name of second arc map: "
 		  ///           << contents.arcMaps(0)[1] << std::endl;
 		  ///\endcode
 		  class LgfContents {
 		  private:
 		    std::istream* _is;
 		    bool local_is;
 		    std::vector<std::string> _node_sections;
 		    std::vector<std::string> _edge_sections;
 		    std::vector<std::string> _attribute_sections;
 		    std::vector<std::string> _extra_sections;
 		    std::vector<bool> _arc_sections;
 		    std::vector<std::vector<std::string> > _node_maps;
 		    std::vector<std::vector<std::string> > _edge_maps;
 		    std::vector<std::vector<std::string> > _attributes;
 		    int line_num;
 		    std::istringstream line;
 		  public:
 		    /// \brief Constructor
 		    ///
 		    /// Construct an \e LGF contents reader, which reads from the given
 		    /// input stream.
 		    LgfContents(std::istream& is)
 		      : _is(&is), local_is(false) {}
 		    /// \brief Constructor
 		    ///
 		    /// Construct an \e LGF contents reader, which reads from the given
 		    /// file.
 		    LgfContents(const std::string& fn)
 		      : _is(new std::ifstream(fn.c_str())), local_is(true) {
 		      if (!(*_is)) {
 		        delete _is;
 		        throw IoError("Cannot open file", fn);
+		      }
+		    }
 		    /// \brief Constructor
 		    ///
 		    /// Construct an \e LGF contents reader, which reads from the given
 		    /// file.
 		    LgfContents(const char* fn)
 		      : _is(new std::ifstream(fn)), local_is(true) {
 		      if (!(*_is)) {
 		        delete _is;
 		        throw IoError("Cannot open file", fn);
+		      }
+		    }
 		    /// \brief Destructor
 		    ~LgfContents() {
 		      if (local_is) delete _is;
+		    }
 		  private:
 		    LgfContents(const LgfContents&);
 		    LgfContents& operator=(const LgfContents&);
 		  public:
-		    /// \name Node sections
+		    /// \name Node Sections
 		    /// @{
 		    /// \brief Gives back the number of node sections in the file.
 		    ///
 		    /// Gives back the number of node sections in the file.
 		    int nodeSectionNum() const {
 		      return _node_sections.size();
+		    }
 		    /// \brief Returns the node section name at the given position.
 		    ///
 		    /// Returns the node section name at the given position.
 		    const std::string& nodeSection(int i) const {
 		      return _node_sections[i];
+		    }
 		    /// \brief Gives back the node maps for the given section.
 		    ///
 		    /// Gives back the node maps for the given section.
 		    const std::vector<std::string>& nodeMapNames(int i) const {
 		      return _node_maps[i];
+		    }
 		    /// @}
-		    /// \name Arc/Edge sections
+		    /// \name Arc/Edge Sections
 		    /// @{
 		    /// \brief Gives back the number of arc/edge sections in the file.
 		    ///
 		    /// Gives back the number of arc/edge sections in the file.
 		    /// \note It is synonym of \c edgeSectionNum().
 		    int arcSectionNum() const {
 		      return _edge_sections.size();
+		    }
 		    /// \brief Returns the arc/edge section name at the given position.
 		    ///
 		    /// Returns the arc/edge section name at the given position.
 		    /// \note It is synonym of \c edgeSection().
 		    const std::string& arcSection(int i) const {
 		      return _edge_sections[i];
+		    }
 		    /// \brief Gives back the arc/edge maps for the given section.
 		    ///
 		    /// Gives back the arc/edge maps for the given section.
 		    /// \note It is synonym of \c edgeMapNames().
 		    const std::vector<std::string>& arcMapNames(int i) const {
 		      return _edge_maps[i];
+		    }
 		    /// @}
 		    /// \name Synonyms
 		    /// @{
 		    /// \brief Gives back the number of arc/edge sections in the file.
 		    ///
 		    /// Gives back the number of arc/edge sections in the file.
 		    /// \note It is synonym of \c arcSectionNum().
 		    int edgeSectionNum() const {
 		      return _edge_sections.size();
+		    }
 		    /// \brief Returns the section name at the given position.
 		    ///
 		    /// Returns the section name at the given position.
 		    /// \note It is synonym of \c arcSection().
 		    const std::string& edgeSection(int i) const {
 		      return _edge_sections[i];
+		    }
 		    /// \brief Gives back the edge maps for the given section.
 		    ///
 		    /// Gives back the edge maps for the given section.
 		    /// \note It is synonym of \c arcMapNames().
 		    const std::vector<std::string>& edgeMapNames(int i) const {
 		      return _edge_maps[i];
+		    }
 		    /// @}
-		    /// \name Attribute sections
+		    /// \name Attribute Sections
 		    /// @{
 		    /// \brief Gives back the number of attribute sections in the file.
 		    ///
 		    /// Gives back the number of attribute sections in the file.
 		    int attributeSectionNum() const {
 		      return _attribute_sections.size();
+		    }
 		    /// \brief Returns the attribute section name at the given position.
 		    ///
 		    /// Returns the attribute section name at the given position.
 		    const std::string& attributeSectionNames(int i) const {
 		      return _attribute_sections[i];
+		    }
 		    /// \brief Gives back the attributes for the given section.
 		    ///
 		    /// Gives back the attributes for the given section.
 		    const std::vector<std::string>& attributes(int i) const {
 		      return _attributes[i];
+		    }
 		    /// @}
-		    /// \name Extra sections
+		    /// \name Extra Sections
 		    /// @{
 		    /// \brief Gives back the number of extra sections in the file.
 		    ///
 		    /// Gives back the number of extra sections in the file.
 		    int extraSectionNum() const {
 		      return _extra_sections.size();
+		    }
 		    /// \brief Returns the extra section type at the given position.
 		    ///
 		    /// Returns the section type at the given position.
 		    const std::string& extraSection(int i) const {
 		      return _extra_sections[i];
+		    }
 		    /// @}
 		  private:
 		    bool readLine() {
 		      std::string str;
 		      while(++line_num, std::getline(*_is, str)) {
 		        line.clear(); line.str(str);
 		        char c;
 		        if (line >> std::ws >> c && c != '#') {
 		          line.putback(c);
 		          return true;
+		        }
+		      }
 		      return false;
+		    }
 		    bool readSuccess() {
 		      return static_cast<bool>(*_is);
+		    }
 		    void skipSection() {
 		      char c;
 		      while (readSuccess() && line >> c && c != '@') {
 		        readLine();
+		      }
 		      if (readSuccess()) {
 		        line.putback(c);
+		      }
+		    }
 		    void readMaps(std::vector<std::string>& maps) {
 		      char c;
 		      if (!readLine() || !(line >> c) || c == '@') {
 		        if (readSuccess() && line) line.putback(c);
 		        return;
+		      }
 		      line.putback(c);
 		      std::string map;
 		      while (_reader_bits::readToken(line, map)) {
 		        maps.push_back(map);
+		      }
+		    }
 		    void readAttributes(std::vector<std::string>& attrs) {
 		      readLine();
 		      char c;
 		      while (readSuccess() && line >> c && c != '@') {
 		        line.putback(c);
 		        std::string attr;
 		        _reader_bits::readToken(line, attr);
 		        attrs.push_back(attr);
 		        readLine();
+		      }
 		      line.putback(c);
+		    }
 		  public:
-		    /// \name Execution of the contents reader
+		    /// \name Execution of the Contents Reader
 		    /// @{
 		    /// \brief Starts the reading
 		    ///
 		    /// This function starts the reading.
 		    void run() {
 		      readLine();
 		      skipSection();
 		      while (readSuccess()) {
 		        char c;
 		        line >> c;
 		        std::string section, caption;
 		        _reader_bits::readToken(line, section);
 		        _reader_bits::readToken(line, caption);
 		        if (section == "nodes") {
 		          _node_sections.push_back(caption);
 		          _node_maps.push_back(std::vector<std::string>());
 		          readMaps(_node_maps.back());
 		          readLine(); skipSection();
 		        } else if (section == "arcs" || section == "edges") {
 		          _edge_sections.push_back(caption);
 		          _arc_sections.push_back(section == "arcs");
 		          _edge_maps.push_back(std::vector<std::string>());
 		          readMaps(_edge_maps.back());
 		          readLine(); skipSection();
 		        } else if (section == "attributes") {
 		          _attribute_sections.push_back(caption);
 		          _attributes.push_back(std::vector<std::string>());
 		          readAttributes(_attributes.back());
 		        } else {
 		          _extra_sections.push_back(section);
 		          readLine(); skipSection();
+		        }
+		      }
+		    }
 		    /// @}
 		  };
+		}
 		#endif

lemon/lgf_writer.h

Show inline comments

@@ -285,1493 +285,1493 @@
 		      char c;
 		      while (is.get(c)) {
 		        if (isWhiteSpace(c) || isEscaped(c)) {
 		          return true;
+		        }
+		      }
 		      return false;
+		    }
 		    inline std::ostream& writeToken(std::ostream& os, const std::string& str) {
 		      if (requireEscape(str)) {
 		        os << '\"';
 		        for (std::string::const_iterator it = str.begin();
 		             it != str.end(); ++it) {
 		          writeEscape(os, *it);
+		        }
 		        os << '\"';
 		      } else {
 		        os << str;
+		      }
 		      return os;
+		    }
 		    class Section {
 		    public:
 		      virtual ~Section() {}
 		      virtual void process(std::ostream& os) = 0;
 		    };
 		    template <typename Functor>
 		    class LineSection : public Section {
 		    private:
 		      Functor _functor;
 		    public:
 		      LineSection(const Functor& functor) : _functor(functor) {}
 		      virtual ~LineSection() {}
 		      virtual void process(std::ostream& os) {
 		        std::string line;
 		        while (!(line = _functor()).empty()) os << line << std::endl;
+		      }
 		    };
 		    template <typename Functor>
 		    class StreamSection : public Section {
 		    private:
 		      Functor _functor;
 		    public:
 		      StreamSection(const Functor& functor) : _functor(functor) {}
 		      virtual ~StreamSection() {}
 		      virtual void process(std::ostream& os) {
 		        _functor(os);
+		      }
 		    };
+		  }
 		  template <typename Digraph>
 		  class DigraphWriter;
 		  template <typename Digraph>
 		  DigraphWriter<Digraph> digraphWriter(const Digraph& digraph,
 		                                       std::ostream& os = std::cout);
 		  template <typename Digraph>
 		  DigraphWriter<Digraph> digraphWriter(const Digraph& digraph,
 		                                       const std::string& fn);
 		  template <typename Digraph>
 		  DigraphWriter<Digraph> digraphWriter(const Digraph& digraph,
 		                                       const char* fn);
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief \ref lgf-format "LGF" writer for directed graphs
 		  ///
 		  /// This utility writes an \ref lgf-format "LGF" file.
 		  ///
 		  /// The writing method does a batch processing. The user creates a
 		  /// writer object, then various writing rules can be added to the
 		  /// writer, and eventually the writing is executed with the \c run()
 		  /// member function. A map writing rule can be added to the writer
 		  /// with the \c nodeMap() or \c arcMap() members. An optional
 		  /// converter parameter can also be added as a standard functor
 		  /// converting from the value type of the map to \c std::string. If it
 		  /// is set, it will determine how the value type of the map is written to
 		  /// the output stream. If the functor is not set, then a default
 		  /// conversion will be used. The \c attribute(), \c node() and \c
 		  /// arc() functions are used to add attribute writing rules.
 		  ///
 		  ///\code
 		  /// DigraphWriter<Digraph>(digraph, std::cout).
 		  ///   nodeMap("coordinates", coord_map).
 		  ///   nodeMap("size", size).
 		  ///   nodeMap("title", title).
 		  ///   arcMap("capacity", cap_map).
 		  ///   node("source", src).
 		  ///   node("target", trg).
 		  ///   attribute("caption", caption).
 		  ///   run();
 		  ///\endcode
 		  ///
 		  ///
 		  /// By default, the writer does not write additional captions to the
 		  /// sections, but they can be give as an optional parameter of
 		  /// the \c nodes(), \c arcs() or \c
 		  /// attributes() functions.
 		  ///
 		  /// The \c skipNodes() and \c skipArcs() functions forbid the
 		  /// writing of the sections. If two arc sections should be written
 		  /// to the output, it can be done in two passes, the first pass
 		  /// writes the node section and the first arc section, then the
 		  /// second pass skips the node section and writes just the arc
 		  /// section to the stream. The output stream can be retrieved with
 		  /// the \c ostream() function, hence the second pass can append its
 		  /// output to the output of the first pass.
 		  template <typename GR>
 		  class DigraphWriter {
 		  public:
 		    typedef GR Digraph;
 		    TEMPLATE_DIGRAPH_TYPEDEFS(Digraph);
 		  private:
 		    std::ostream* _os;
 		    bool local_os;
 		    const Digraph& _digraph;
 		    std::string _nodes_caption;
 		    std::string _arcs_caption;
 		    std::string _attributes_caption;
 		    typedef std::map<Node, std::string> NodeIndex;
 		    NodeIndex _node_index;
 		    typedef std::map<Arc, std::string> ArcIndex;
 		    ArcIndex _arc_index;
 		    typedef std::vector<std::pair<std::string,
 		      _writer_bits::MapStorageBase<Node>* > > NodeMaps;
 		    NodeMaps _node_maps;
 		    typedef std::vector<std::pair<std::string,
 		      _writer_bits::MapStorageBase<Arc>* > >ArcMaps;
 		    ArcMaps _arc_maps;
 		    typedef std::vector<std::pair<std::string,
 		      _writer_bits::ValueStorageBase*> > Attributes;
 		    Attributes _attributes;
 		    bool _skip_nodes;
 		    bool _skip_arcs;
 		  public:
 		    /// \brief Constructor
 		    ///
 		    /// Construct a directed graph writer, which writes to the given
 		    /// output stream.
 		    DigraphWriter(const Digraph& digraph, std::ostream& os = std::cout)
 		      : _os(&os), local_os(false), _digraph(digraph),
 		        _skip_nodes(false), _skip_arcs(false) {}
 		    /// \brief Constructor
 		    ///
 		    /// Construct a directed graph writer, which writes to the given
 		    /// output file.
 		    DigraphWriter(const Digraph& digraph, const std::string& fn)
 		      : _os(new std::ofstream(fn.c_str())), local_os(true), _digraph(digraph),
 		        _skip_nodes(false), _skip_arcs(false) {
 		      if (!(*_os)) {
 		        delete _os;
 		        throw IoError("Cannot write file", fn);
+		      }
+		    }
 		    /// \brief Constructor
 		    ///
 		    /// Construct a directed graph writer, which writes to the given
 		    /// output file.
 		    DigraphWriter(const Digraph& digraph, const char* fn)
 		      : _os(new std::ofstream(fn)), local_os(true), _digraph(digraph),
 		        _skip_nodes(false), _skip_arcs(false) {
 		      if (!(*_os)) {
 		        delete _os;
 		        throw IoError("Cannot write file", fn);
+		      }
+		    }
 		    /// \brief Destructor
 		    ~DigraphWriter() {
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        delete it->second;
+		      }
 		      for (typename ArcMaps::iterator it = _arc_maps.begin();
 		           it != _arc_maps.end(); ++it) {
 		        delete it->second;
+		      }
 		      for (typename Attributes::iterator it = _attributes.begin();
 		           it != _attributes.end(); ++it) {
 		        delete it->second;
+		      }
 		      if (local_os) {
 		        delete _os;
+		      }
+		    }
 		  private:
 		    template <typename DGR>
 		    friend DigraphWriter<DGR> digraphWriter(const DGR& digraph,
 		                                            std::ostream& os);
 		    template <typename DGR>
 		    friend DigraphWriter<DGR> digraphWriter(const DGR& digraph,
 		                                            const std::string& fn);
 		    template <typename DGR>
 		    friend DigraphWriter<DGR> digraphWriter(const DGR& digraph,
 		                                            const char *fn);
 		    DigraphWriter(DigraphWriter& other)
 		      : _os(other._os), local_os(other.local_os), _digraph(other._digraph),
 		        _skip_nodes(other._skip_nodes), _skip_arcs(other._skip_arcs) {
 		      other._os = 0;
 		      other.local_os = false;
 		      _node_index.swap(other._node_index);
 		      _arc_index.swap(other._arc_index);
 		      _node_maps.swap(other._node_maps);
 		      _arc_maps.swap(other._arc_maps);
 		      _attributes.swap(other._attributes);
 		      _nodes_caption = other._nodes_caption;
 		      _arcs_caption = other._arcs_caption;
 		      _attributes_caption = other._attributes_caption;
+		    }
 		    DigraphWriter& operator=(const DigraphWriter&);
 		  public:
-		    /// \name Writing rules
+		    /// \name Writing Rules
 		    /// @{
 		    /// \brief Node map writing rule
 		    ///
 		    /// Add a node map writing rule to the writer.
 		    template <typename Map>
 		    DigraphWriter& nodeMap(const std::string& caption, const Map& map) {
 		      checkConcept<concepts::ReadMap<Node, typename Map::Value>, Map>();
 		      _writer_bits::MapStorageBase<Node>* storage =
 		        new _writer_bits::MapStorage<Node, Map>(map);
 		      _node_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Node map writing rule
 		    ///
 		    /// Add a node map writing rule with specialized converter to the
 		    /// writer.
 		    template <typename Map, typename Converter>
 		    DigraphWriter& nodeMap(const std::string& caption, const Map& map,
 		                           const Converter& converter = Converter()) {
 		      checkConcept<concepts::ReadMap<Node, typename Map::Value>, Map>();
 		      _writer_bits::MapStorageBase<Node>* storage =
 		        new _writer_bits::MapStorage<Node, Map, Converter>(map, converter);
 		      _node_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Arc map writing rule
 		    ///
 		    /// Add an arc map writing rule to the writer.
 		    template <typename Map>
 		    DigraphWriter& arcMap(const std::string& caption, const Map& map) {
 		      checkConcept<concepts::ReadMap<Arc, typename Map::Value>, Map>();
 		      _writer_bits::MapStorageBase<Arc>* storage =
 		        new _writer_bits::MapStorage<Arc, Map>(map);
 		      _arc_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Arc map writing rule
 		    ///
 		    /// Add an arc map writing rule with specialized converter to the
 		    /// writer.
 		    template <typename Map, typename Converter>
 		    DigraphWriter& arcMap(const std::string& caption, const Map& map,
 		                          const Converter& converter = Converter()) {
 		      checkConcept<concepts::ReadMap<Arc, typename Map::Value>, Map>();
 		      _writer_bits::MapStorageBase<Arc>* storage =
 		        new _writer_bits::MapStorage<Arc, Map, Converter>(map, converter);
 		      _arc_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Attribute writing rule
 		    ///
 		    /// Add an attribute writing rule to the writer.
 		    template <typename Value>
 		    DigraphWriter& attribute(const std::string& caption, const Value& value) {
 		      _writer_bits::ValueStorageBase* storage =
 		        new _writer_bits::ValueStorage<Value>(value);
 		      _attributes.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Attribute writing rule
 		    ///
 		    /// Add an attribute writing rule with specialized converter to the
 		    /// writer.
 		    template <typename Value, typename Converter>
 		    DigraphWriter& attribute(const std::string& caption, const Value& value,
 		                             const Converter& converter = Converter()) {
 		      _writer_bits::ValueStorageBase* storage =
 		        new _writer_bits::ValueStorage<Value, Converter>(value, converter);
 		      _attributes.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Node writing rule
 		    ///
 		    /// Add a node writing rule to the writer.
 		    DigraphWriter& node(const std::string& caption, const Node& node) {
 		      typedef _writer_bits::MapLookUpConverter<Node> Converter;
 		      Converter converter(_node_index);
 		      _writer_bits::ValueStorageBase* storage =
 		        new _writer_bits::ValueStorage<Node, Converter>(node, converter);
 		      _attributes.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Arc writing rule
 		    ///
 		    /// Add an arc writing rule to writer.
 		    DigraphWriter& arc(const std::string& caption, const Arc& arc) {
 		      typedef _writer_bits::MapLookUpConverter<Arc> Converter;
 		      Converter converter(_arc_index);
 		      _writer_bits::ValueStorageBase* storage =
 		        new _writer_bits::ValueStorage<Arc, Converter>(arc, converter);
 		      _attributes.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
-		    /// \name Section captions
+		    /// \name Section Captions
 		    /// @{
 		    /// \brief Add an additional caption to the \c \@nodes section
 		    ///
 		    /// Add an additional caption to the \c \@nodes section.
 		    DigraphWriter& nodes(const std::string& caption) {
 		      _nodes_caption = caption;
 		      return *this;
+		    }
 		    /// \brief Add an additional caption to the \c \@arcs section
 		    ///
 		    /// Add an additional caption to the \c \@arcs section.
 		    DigraphWriter& arcs(const std::string& caption) {
 		      _arcs_caption = caption;
 		      return *this;
+		    }
 		    /// \brief Add an additional caption to the \c \@attributes section
 		    ///
 		    /// Add an additional caption to the \c \@attributes section.
 		    DigraphWriter& attributes(const std::string& caption) {
 		      _attributes_caption = caption;
 		      return *this;
+		    }
-		    /// \name Skipping section
+		    /// \name Skipping Section
 		    /// @{
 		    /// \brief Skip writing the node set
 		    ///
 		    /// The \c \@nodes section will not be written to the stream.
 		    DigraphWriter& skipNodes() {
 		      LEMON_ASSERT(!_skip_nodes, "Multiple usage of skipNodes() member");
 		      _skip_nodes = true;
 		      return *this;
+		    }
 		    /// \brief Skip writing arc set
 		    ///
 		    /// The \c \@arcs section will not be written to the stream.
 		    DigraphWriter& skipArcs() {
 		      LEMON_ASSERT(!_skip_arcs, "Multiple usage of skipArcs() member");
 		      _skip_arcs = true;
 		      return *this;
+		    }
 		    /// @}
 		  private:
 		    void writeNodes() {
 		      _writer_bits::MapStorageBase<Node>* label = 0;
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        if (it->first == "label") {
 		          label = it->second;
 		          break;
+		        }
+		      }
 		      *_os << "@nodes";
 		      if (!_nodes_caption.empty()) {
 		        _writer_bits::writeToken(*_os << ' ', _nodes_caption);
+		      }
 		      *_os << std::endl;
 		      if (label == 0) {
 		        *_os << "label" << '\t';
+		      }
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        _writer_bits::writeToken(*_os, it->first) << '\t';
+		      }
 		      *_os << std::endl;
 		      std::vector<Node> nodes;
 		      for (NodeIt n(_digraph); n != INVALID; ++n) {
 		        nodes.push_back(n);
+		      }
 		      if (label == 0) {
 		        IdMap<Digraph, Node> id_map(_digraph);
 		        _writer_bits::MapLess<IdMap<Digraph, Node> > id_less(id_map);
 		        std::sort(nodes.begin(), nodes.end(), id_less);
 		      } else {
 		        label->sort(nodes);
+		      }
 		      for (int i = 0; i < static_cast<int>(nodes.size()); ++i) {
 		        Node n = nodes[i];
 		        if (label == 0) {
 		          std::ostringstream os;
 		          os << _digraph.id(n);
 		          _writer_bits::writeToken(*_os, os.str());
 		          *_os << '\t';
 		          _node_index.insert(std::make_pair(n, os.str()));
+		        }
 		        for (typename NodeMaps::iterator it = _node_maps.begin();
 		             it != _node_maps.end(); ++it) {
 		          std::string value = it->second->get(n);
 		          _writer_bits::writeToken(*_os, value);
 		          if (it->first == "label") {
 		            _node_index.insert(std::make_pair(n, value));
+		          }
 		          *_os << '\t';
+		        }
 		        *_os << std::endl;
+		      }
+		    }
 		    void createNodeIndex() {
 		      _writer_bits::MapStorageBase<Node>* label = 0;
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        if (it->first == "label") {
 		          label = it->second;
 		          break;
+		        }
+		      }
 		      if (label == 0) {
 		        for (NodeIt n(_digraph); n != INVALID; ++n) {
 		          std::ostringstream os;
 		          os << _digraph.id(n);
 		          _node_index.insert(std::make_pair(n, os.str()));
+		        }
 		      } else {
 		        for (NodeIt n(_digraph); n != INVALID; ++n) {
 		          std::string value = label->get(n);
 		          _node_index.insert(std::make_pair(n, value));
+		        }
+		      }
+		    }
 		    void writeArcs() {
 		      _writer_bits::MapStorageBase<Arc>* label = 0;
 		      for (typename ArcMaps::iterator it = _arc_maps.begin();
 		           it != _arc_maps.end(); ++it) {
 		        if (it->first == "label") {
 		          label = it->second;
 		          break;
+		        }
+		      }
 		      *_os << "@arcs";
 		      if (!_arcs_caption.empty()) {
 		        _writer_bits::writeToken(*_os << ' ', _arcs_caption);
+		      }
 		      *_os << std::endl;
 		      *_os << '\t' << '\t';
 		      if (label == 0) {
 		        *_os << "label" << '\t';
+		      }
 		      for (typename ArcMaps::iterator it = _arc_maps.begin();
 		           it != _arc_maps.end(); ++it) {
 		        _writer_bits::writeToken(*_os, it->first) << '\t';
+		      }
 		      *_os << std::endl;
 		      std::vector<Arc> arcs;
 		      for (ArcIt n(_digraph); n != INVALID; ++n) {
 		        arcs.push_back(n);
+		      }
 		      if (label == 0) {
 		        IdMap<Digraph, Arc> id_map(_digraph);
 		        _writer_bits::MapLess<IdMap<Digraph, Arc> > id_less(id_map);
 		        std::sort(arcs.begin(), arcs.end(), id_less);
 		      } else {
 		        label->sort(arcs);
+		      }
 		      for (int i = 0; i < static_cast<int>(arcs.size()); ++i) {
 		        Arc a = arcs[i];
 		        _writer_bits::writeToken(*_os, _node_index.
 		                                 find(_digraph.source(a))->second);
 		        *_os << '\t';
 		        _writer_bits::writeToken(*_os, _node_index.
 		                                 find(_digraph.target(a))->second);
 		        *_os << '\t';
 		        if (label == 0) {
 		          std::ostringstream os;
 		          os << _digraph.id(a);
 		          _writer_bits::writeToken(*_os, os.str());
 		          *_os << '\t';
 		          _arc_index.insert(std::make_pair(a, os.str()));
+		        }
 		        for (typename ArcMaps::iterator it = _arc_maps.begin();
 		             it != _arc_maps.end(); ++it) {
 		          std::string value = it->second->get(a);
 		          _writer_bits::writeToken(*_os, value);
 		          if (it->first == "label") {
 		            _arc_index.insert(std::make_pair(a, value));
+		          }
 		          *_os << '\t';
+		        }
 		        *_os << std::endl;
+		      }
+		    }
 		    void createArcIndex() {
 		      _writer_bits::MapStorageBase<Arc>* label = 0;
 		      for (typename ArcMaps::iterator it = _arc_maps.begin();
 		           it != _arc_maps.end(); ++it) {
 		        if (it->first == "label") {
 		          label = it->second;
 		          break;
+		        }
+		      }
 		      if (label == 0) {
 		        for (ArcIt a(_digraph); a != INVALID; ++a) {
 		          std::ostringstream os;
 		          os << _digraph.id(a);
 		          _arc_index.insert(std::make_pair(a, os.str()));
+		        }
 		      } else {
 		        for (ArcIt a(_digraph); a != INVALID; ++a) {
 		          std::string value = label->get(a);
 		          _arc_index.insert(std::make_pair(a, value));
+		        }
+		      }
+		    }
 		    void writeAttributes() {
 		      if (_attributes.empty()) return;
 		      *_os << "@attributes";
 		      if (!_attributes_caption.empty()) {
 		        _writer_bits::writeToken(*_os << ' ', _attributes_caption);
+		      }
 		      *_os << std::endl;
 		      for (typename Attributes::iterator it = _attributes.begin();
 		           it != _attributes.end(); ++it) {
 		        _writer_bits::writeToken(*_os, it->first) << ' ';
 		        _writer_bits::writeToken(*_os, it->second->get());
 		        *_os << std::endl;
+		      }
+		    }
 		  public:
-		    /// \name Execution of the writer
+		    /// \name Execution of the Writer
 		    /// @{
 		    /// \brief Start the batch processing
 		    ///
 		    /// This function starts the batch processing.
 		    void run() {
 		      if (!_skip_nodes) {
 		        writeNodes();
 		      } else {
 		        createNodeIndex();
+		      }
 		      if (!_skip_arcs) {
 		        writeArcs();
 		      } else {
 		        createArcIndex();
+		      }
 		      writeAttributes();
+		    }
 		    /// \brief Give back the stream of the writer
 		    ///
 		    /// Give back the stream of the writer.
 		    std::ostream& ostream() {
 		      return *_os;
+		    }
 		    /// @}
 		  };
 		  /// \brief Return a \ref DigraphWriter class
 		  ///
 		  /// This function just returns a \ref DigraphWriter class.
 		  /// \relates DigraphWriter
 		  template <typename Digraph>
 		  DigraphWriter<Digraph> digraphWriter(const Digraph& digraph,
 		                                       std::ostream& os) {
 		    DigraphWriter<Digraph> tmp(digraph, os);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref DigraphWriter class
 		  ///
 		  /// This function just returns a \ref DigraphWriter class.
 		  /// \relates DigraphWriter
 		  template <typename Digraph>
 		  DigraphWriter<Digraph> digraphWriter(const Digraph& digraph,
 		                                       const std::string& fn) {
 		    DigraphWriter<Digraph> tmp(digraph, fn);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref DigraphWriter class
 		  ///
 		  /// This function just returns a \ref DigraphWriter class.
 		  /// \relates DigraphWriter
 		  template <typename Digraph>
 		  DigraphWriter<Digraph> digraphWriter(const Digraph& digraph,
 		                                       const char* fn) {
 		    DigraphWriter<Digraph> tmp(digraph, fn);
 		    return tmp;
+		  }
 		  template <typename Graph>
 		  class GraphWriter;
 		  template <typename Graph>
 		  GraphWriter<Graph> graphWriter(const Graph& graph,
 		                                 std::ostream& os = std::cout);
 		  template <typename Graph>
 		  GraphWriter<Graph> graphWriter(const Graph& graph, const std::string& fn);
 		  template <typename Graph>
 		  GraphWriter<Graph> graphWriter(const Graph& graph, const char* fn);
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief \ref lgf-format "LGF" writer for directed graphs
 		  ///
 		  /// This utility writes an \ref lgf-format "LGF" file.
 		  ///
 		  /// It can be used almost the same way as \c DigraphWriter.
 		  /// The only difference is that this class can handle edges and
 		  /// edge maps as well as arcs and arc maps.
 		  ///
 		  /// The arc maps are written into the file as two columns, the
 		  /// caption of the columns are the name of the map prefixed with \c
 		  /// '+' and \c '-'. The arcs are written into the \c \@attributes
 		  /// section as a \c '+' or a \c '-' prefix (depends on the direction
 		  /// of the arc) and the label of corresponding edge.
 		  template <typename GR>
 		  class GraphWriter {
 		  public:
 		    typedef GR Graph;
 		    TEMPLATE_GRAPH_TYPEDEFS(Graph);
 		  private:
 		    std::ostream* _os;
 		    bool local_os;
 		    const Graph& _graph;
 		    std::string _nodes_caption;
 		    std::string _edges_caption;
 		    std::string _attributes_caption;
 		    typedef std::map<Node, std::string> NodeIndex;
 		    NodeIndex _node_index;
 		    typedef std::map<Edge, std::string> EdgeIndex;
 		    EdgeIndex _edge_index;
 		    typedef std::vector<std::pair<std::string,
 		      _writer_bits::MapStorageBase<Node>* > > NodeMaps;
 		    NodeMaps _node_maps;
 		    typedef std::vector<std::pair<std::string,
 		      _writer_bits::MapStorageBase<Edge>* > >EdgeMaps;
 		    EdgeMaps _edge_maps;
 		    typedef std::vector<std::pair<std::string,
 		      _writer_bits::ValueStorageBase*> > Attributes;
 		    Attributes _attributes;
 		    bool _skip_nodes;
 		    bool _skip_edges;
 		  public:
 		    /// \brief Constructor
 		    ///
 		    /// Construct a directed graph writer, which writes to the given
 		    /// output stream.
 		    GraphWriter(const Graph& graph, std::ostream& os = std::cout)
 		      : _os(&os), local_os(false), _graph(graph),
 		        _skip_nodes(false), _skip_edges(false) {}
 		    /// \brief Constructor
 		    ///
 		    /// Construct a directed graph writer, which writes to the given
 		    /// output file.
 		    GraphWriter(const Graph& graph, const std::string& fn)
 		      : _os(new std::ofstream(fn.c_str())), local_os(true), _graph(graph),
 		        _skip_nodes(false), _skip_edges(false) {
 		      if (!(*_os)) {
 		        delete _os;
 		        throw IoError("Cannot write file", fn);
+		      }
+		    }
 		    /// \brief Constructor
 		    ///
 		    /// Construct a directed graph writer, which writes to the given
 		    /// output file.
 		    GraphWriter(const Graph& graph, const char* fn)
 		      : _os(new std::ofstream(fn)), local_os(true), _graph(graph),
 		        _skip_nodes(false), _skip_edges(false) {
 		      if (!(*_os)) {
 		        delete _os;
 		        throw IoError("Cannot write file", fn);
+		      }
+		    }
 		    /// \brief Destructor
 		    ~GraphWriter() {
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        delete it->second;
+		      }
 		      for (typename EdgeMaps::iterator it = _edge_maps.begin();
 		           it != _edge_maps.end(); ++it) {
 		        delete it->second;
+		      }
 		      for (typename Attributes::iterator it = _attributes.begin();
 		           it != _attributes.end(); ++it) {
 		        delete it->second;
+		      }
 		      if (local_os) {
 		        delete _os;
+		      }
+		    }
 		  private:
 		    template <typename Graph>
 		    friend GraphWriter<Graph> graphWriter(const Graph& graph,
 		                                          std::ostream& os);
 		    template <typename Graph>
 		    friend GraphWriter<Graph> graphWriter(const Graph& graph,
 		                                          const std::string& fn);
 		    template <typename Graph>
 		    friend GraphWriter<Graph> graphWriter(const Graph& graph,
 		                                          const char *fn);
 		    GraphWriter(GraphWriter& other)
 		      : _os(other._os), local_os(other.local_os), _graph(other._graph),
 		        _skip_nodes(other._skip_nodes), _skip_edges(other._skip_edges) {
 		      other._os = 0;
 		      other.local_os = false;
 		      _node_index.swap(other._node_index);
 		      _edge_index.swap(other._edge_index);
 		      _node_maps.swap(other._node_maps);
 		      _edge_maps.swap(other._edge_maps);
 		      _attributes.swap(other._attributes);
 		      _nodes_caption = other._nodes_caption;
 		      _edges_caption = other._edges_caption;
 		      _attributes_caption = other._attributes_caption;
+		    }
 		    GraphWriter& operator=(const GraphWriter&);
 		  public:
-		    /// \name Writing rules
+		    /// \name Writing Rules
 		    /// @{
 		    /// \brief Node map writing rule
 		    ///
 		    /// Add a node map writing rule to the writer.
 		    template <typename Map>
 		    GraphWriter& nodeMap(const std::string& caption, const Map& map) {
 		      checkConcept<concepts::ReadMap<Node, typename Map::Value>, Map>();
 		      _writer_bits::MapStorageBase<Node>* storage =
 		        new _writer_bits::MapStorage<Node, Map>(map);
 		      _node_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Node map writing rule
 		    ///
 		    /// Add a node map writing rule with specialized converter to the
 		    /// writer.
 		    template <typename Map, typename Converter>
 		    GraphWriter& nodeMap(const std::string& caption, const Map& map,
 		                           const Converter& converter = Converter()) {
 		      checkConcept<concepts::ReadMap<Node, typename Map::Value>, Map>();
 		      _writer_bits::MapStorageBase<Node>* storage =
 		        new _writer_bits::MapStorage<Node, Map, Converter>(map, converter);
 		      _node_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Edge map writing rule
 		    ///
 		    /// Add an edge map writing rule to the writer.
 		    template <typename Map>
 		    GraphWriter& edgeMap(const std::string& caption, const Map& map) {
 		      checkConcept<concepts::ReadMap<Edge, typename Map::Value>, Map>();
 		      _writer_bits::MapStorageBase<Edge>* storage =
 		        new _writer_bits::MapStorage<Edge, Map>(map);
 		      _edge_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Edge map writing rule
 		    ///
 		    /// Add an edge map writing rule with specialized converter to the
 		    /// writer.
 		    template <typename Map, typename Converter>
 		    GraphWriter& edgeMap(const std::string& caption, const Map& map,
 		                          const Converter& converter = Converter()) {
 		      checkConcept<concepts::ReadMap<Edge, typename Map::Value>, Map>();
 		      _writer_bits::MapStorageBase<Edge>* storage =
 		        new _writer_bits::MapStorage<Edge, Map, Converter>(map, converter);
 		      _edge_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Arc map writing rule
 		    ///
 		    /// Add an arc map writing rule to the writer.
 		    template <typename Map>
 		    GraphWriter& arcMap(const std::string& caption, const Map& map) {
 		      checkConcept<concepts::ReadMap<Arc, typename Map::Value>, Map>();
 		      _writer_bits::MapStorageBase<Edge>* forward_storage =
 		        new _writer_bits::GraphArcMapStorage<Graph, true, Map>(_graph, map);
 		      _edge_maps.push_back(std::make_pair('+' + caption, forward_storage));
 		      _writer_bits::MapStorageBase<Edge>* backward_storage =
 		        new _writer_bits::GraphArcMapStorage<Graph, false, Map>(_graph, map);
 		      _edge_maps.push_back(std::make_pair('-' + caption, backward_storage));
 		      return *this;
+		    }
 		    /// \brief Arc map writing rule
 		    ///
 		    /// Add an arc map writing rule with specialized converter to the
 		    /// writer.
 		    template <typename Map, typename Converter>
 		    GraphWriter& arcMap(const std::string& caption, const Map& map,
 		                          const Converter& converter = Converter()) {
 		      checkConcept<concepts::ReadMap<Arc, typename Map::Value>, Map>();
 		      _writer_bits::MapStorageBase<Edge>* forward_storage =
 		        new _writer_bits::GraphArcMapStorage<Graph, true, Map, Converter>
 		        (_graph, map, converter);
 		      _edge_maps.push_back(std::make_pair('+' + caption, forward_storage));
 		      _writer_bits::MapStorageBase<Edge>* backward_storage =
 		        new _writer_bits::GraphArcMapStorage<Graph, false, Map, Converter>
 		        (_graph, map, converter);
 		      _edge_maps.push_back(std::make_pair('-' + caption, backward_storage));
 		      return *this;
+		    }
 		    /// \brief Attribute writing rule
 		    ///
 		    /// Add an attribute writing rule to the writer.
 		    template <typename Value>
 		    GraphWriter& attribute(const std::string& caption, const Value& value) {
 		      _writer_bits::ValueStorageBase* storage =
 		        new _writer_bits::ValueStorage<Value>(value);
 		      _attributes.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Attribute writing rule
 		    ///
 		    /// Add an attribute writing rule with specialized converter to the
 		    /// writer.
 		    template <typename Value, typename Converter>
 		    GraphWriter& attribute(const std::string& caption, const Value& value,
 		                             const Converter& converter = Converter()) {
 		      _writer_bits::ValueStorageBase* storage =
 		        new _writer_bits::ValueStorage<Value, Converter>(value, converter);
 		      _attributes.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Node writing rule
 		    ///
 		    /// Add a node writing rule to the writer.
 		    GraphWriter& node(const std::string& caption, const Node& node) {
 		      typedef _writer_bits::MapLookUpConverter<Node> Converter;
 		      Converter converter(_node_index);
 		      _writer_bits::ValueStorageBase* storage =
 		        new _writer_bits::ValueStorage<Node, Converter>(node, converter);
 		      _attributes.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Edge writing rule
 		    ///
 		    /// Add an edge writing rule to writer.
 		    GraphWriter& edge(const std::string& caption, const Edge& edge) {
 		      typedef _writer_bits::MapLookUpConverter<Edge> Converter;
 		      Converter converter(_edge_index);
 		      _writer_bits::ValueStorageBase* storage =
 		        new _writer_bits::ValueStorage<Edge, Converter>(edge, converter);
 		      _attributes.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Arc writing rule
 		    ///
 		    /// Add an arc writing rule to writer.
 		    GraphWriter& arc(const std::string& caption, const Arc& arc) {
 		      typedef _writer_bits::GraphArcLookUpConverter<Graph> Converter;
 		      Converter converter(_graph, _edge_index);
 		      _writer_bits::ValueStorageBase* storage =
 		        new _writer_bits::ValueStorage<Arc, Converter>(arc, converter);
 		      _attributes.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
-		    /// \name Section captions
+		    /// \name Section Captions
 		    /// @{
 		    /// \brief Add an additional caption to the \c \@nodes section
 		    ///
 		    /// Add an additional caption to the \c \@nodes section.
 		    GraphWriter& nodes(const std::string& caption) {
 		      _nodes_caption = caption;
 		      return *this;
+		    }
 		    /// \brief Add an additional caption to the \c \@arcs section
 		    ///
 		    /// Add an additional caption to the \c \@arcs section.
 		    GraphWriter& edges(const std::string& caption) {
 		      _edges_caption = caption;
 		      return *this;
+		    }
 		    /// \brief Add an additional caption to the \c \@attributes section
 		    ///
 		    /// Add an additional caption to the \c \@attributes section.
 		    GraphWriter& attributes(const std::string& caption) {
 		      _attributes_caption = caption;
 		      return *this;
+		    }
-		    /// \name Skipping section
+		    /// \name Skipping Section
 		    /// @{
 		    /// \brief Skip writing the node set
 		    ///
 		    /// The \c \@nodes section will not be written to the stream.
 		    GraphWriter& skipNodes() {
 		      LEMON_ASSERT(!_skip_nodes, "Multiple usage of skipNodes() member");
 		      _skip_nodes = true;
 		      return *this;
+		    }
 		    /// \brief Skip writing edge set
 		    ///
 		    /// The \c \@edges section will not be written to the stream.
 		    GraphWriter& skipEdges() {
 		      LEMON_ASSERT(!_skip_edges, "Multiple usage of skipEdges() member");
 		      _skip_edges = true;
 		      return *this;
+		    }
 		    /// @}
 		  private:
 		    void writeNodes() {
 		      _writer_bits::MapStorageBase<Node>* label = 0;
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        if (it->first == "label") {
 		          label = it->second;
 		          break;
+		        }
+		      }
 		      *_os << "@nodes";
 		      if (!_nodes_caption.empty()) {
 		        _writer_bits::writeToken(*_os << ' ', _nodes_caption);
+		      }
 		      *_os << std::endl;
 		      if (label == 0) {
 		        *_os << "label" << '\t';
+		      }
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        _writer_bits::writeToken(*_os, it->first) << '\t';
+		      }
 		      *_os << std::endl;
 		      std::vector<Node> nodes;
 		      for (NodeIt n(_graph); n != INVALID; ++n) {
 		        nodes.push_back(n);
+		      }
 		      if (label == 0) {
 		        IdMap<Graph, Node> id_map(_graph);
 		        _writer_bits::MapLess<IdMap<Graph, Node> > id_less(id_map);
 		        std::sort(nodes.begin(), nodes.end(), id_less);
 		      } else {
 		        label->sort(nodes);
+		      }
 		      for (int i = 0; i < static_cast<int>(nodes.size()); ++i) {
 		        Node n = nodes[i];
 		        if (label == 0) {
 		          std::ostringstream os;
 		          os << _graph.id(n);
 		          _writer_bits::writeToken(*_os, os.str());
 		          *_os << '\t';
 		          _node_index.insert(std::make_pair(n, os.str()));
+		        }
 		        for (typename NodeMaps::iterator it = _node_maps.begin();
 		             it != _node_maps.end(); ++it) {
 		          std::string value = it->second->get(n);
 		          _writer_bits::writeToken(*_os, value);
 		          if (it->first == "label") {
 		            _node_index.insert(std::make_pair(n, value));
+		          }
 		          *_os << '\t';
+		        }
 		        *_os << std::endl;
+		      }
+		    }
 		    void createNodeIndex() {
 		      _writer_bits::MapStorageBase<Node>* label = 0;
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        if (it->first == "label") {
 		          label = it->second;
 		          break;
+		        }
+		      }
 		      if (label == 0) {
 		        for (NodeIt n(_graph); n != INVALID; ++n) {
 		          std::ostringstream os;
 		          os << _graph.id(n);
 		          _node_index.insert(std::make_pair(n, os.str()));
+		        }
 		      } else {
 		        for (NodeIt n(_graph); n != INVALID; ++n) {
 		          std::string value = label->get(n);
 		          _node_index.insert(std::make_pair(n, value));
+		        }
+		      }
+		    }
 		    void writeEdges() {
 		      _writer_bits::MapStorageBase<Edge>* label = 0;
 		      for (typename EdgeMaps::iterator it = _edge_maps.begin();
 		           it != _edge_maps.end(); ++it) {
 		        if (it->first == "label") {
 		          label = it->second;
 		          break;
+		        }
+		      }
 		      *_os << "@edges";
 		      if (!_edges_caption.empty()) {
 		        _writer_bits::writeToken(*_os << ' ', _edges_caption);
+		      }
 		      *_os << std::endl;
 		      *_os << '\t' << '\t';
 		      if (label == 0) {
 		        *_os << "label" << '\t';
+		      }
 		      for (typename EdgeMaps::iterator it = _edge_maps.begin();
 		           it != _edge_maps.end(); ++it) {
 		        _writer_bits::writeToken(*_os, it->first) << '\t';
+		      }
 		      *_os << std::endl;
 		      std::vector<Edge> edges;
 		      for (EdgeIt n(_graph); n != INVALID; ++n) {
 		        edges.push_back(n);
+		      }
 		      if (label == 0) {
 		        IdMap<Graph, Edge> id_map(_graph);
 		        _writer_bits::MapLess<IdMap<Graph, Edge> > id_less(id_map);
 		        std::sort(edges.begin(), edges.end(), id_less);
 		      } else {
 		        label->sort(edges);
+		      }
 		      for (int i = 0; i < static_cast<int>(edges.size()); ++i) {
 		        Edge e = edges[i];
 		        _writer_bits::writeToken(*_os, _node_index.
 		                                 find(_graph.u(e))->second);
 		        *_os << '\t';
 		        _writer_bits::writeToken(*_os, _node_index.
 		                                 find(_graph.v(e))->second);
 		        *_os << '\t';
 		        if (label == 0) {
 		          std::ostringstream os;
 		          os << _graph.id(e);
 		          _writer_bits::writeToken(*_os, os.str());
 		          *_os << '\t';
 		          _edge_index.insert(std::make_pair(e, os.str()));
+		        }
 		        for (typename EdgeMaps::iterator it = _edge_maps.begin();
 		             it != _edge_maps.end(); ++it) {
 		          std::string value = it->second->get(e);
 		          _writer_bits::writeToken(*_os, value);
 		          if (it->first == "label") {
 		            _edge_index.insert(std::make_pair(e, value));
+		          }
 		          *_os << '\t';
+		        }
 		        *_os << std::endl;
+		      }
+		    }
 		    void createEdgeIndex() {
 		      _writer_bits::MapStorageBase<Edge>* label = 0;
 		      for (typename EdgeMaps::iterator it = _edge_maps.begin();
 		           it != _edge_maps.end(); ++it) {
 		        if (it->first == "label") {
 		          label = it->second;
 		          break;
+		        }
+		      }
 		      if (label == 0) {
 		        for (EdgeIt e(_graph); e != INVALID; ++e) {
 		          std::ostringstream os;
 		          os << _graph.id(e);
 		          _edge_index.insert(std::make_pair(e, os.str()));
+		        }
 		      } else {
 		        for (EdgeIt e(_graph); e != INVALID; ++e) {
 		          std::string value = label->get(e);
 		          _edge_index.insert(std::make_pair(e, value));
+		        }
+		      }
+		    }
 		    void writeAttributes() {
 		      if (_attributes.empty()) return;
 		      *_os << "@attributes";
 		      if (!_attributes_caption.empty()) {
 		        _writer_bits::writeToken(*_os << ' ', _attributes_caption);
+		      }
 		      *_os << std::endl;
 		      for (typename Attributes::iterator it = _attributes.begin();
 		           it != _attributes.end(); ++it) {
 		        _writer_bits::writeToken(*_os, it->first) << ' ';
 		        _writer_bits::writeToken(*_os, it->second->get());
 		        *_os << std::endl;
+		      }
+		    }
 		  public:
-		    /// \name Execution of the writer
+		    /// \name Execution of the Writer
 		    /// @{
 		    /// \brief Start the batch processing
 		    ///
 		    /// This function starts the batch processing.
 		    void run() {
 		      if (!_skip_nodes) {
 		        writeNodes();
 		      } else {
 		        createNodeIndex();
+		      }
 		      if (!_skip_edges) {
 		        writeEdges();
 		      } else {
 		        createEdgeIndex();
+		      }
 		      writeAttributes();
+		    }
 		    /// \brief Give back the stream of the writer
 		    ///
 		    /// Give back the stream of the writer
 		    std::ostream& ostream() {
 		      return *_os;
+		    }
 		    /// @}
 		  };
 		  /// \brief Return a \ref GraphWriter class
 		  ///
 		  /// This function just returns a \ref GraphWriter class.
 		  /// \relates GraphWriter
 		  template <typename Graph>
 		  GraphWriter<Graph> graphWriter(const Graph& graph,
 		                                 std::ostream& os) {
 		    GraphWriter<Graph> tmp(graph, os);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref GraphWriter class
 		  ///
 		  /// This function just returns a \ref GraphWriter class.
 		  /// \relates GraphWriter
 		  template <typename Graph>
 		  GraphWriter<Graph> graphWriter(const Graph& graph, const std::string& fn) {
 		    GraphWriter<Graph> tmp(graph, fn);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref GraphWriter class
 		  ///
 		  /// This function just returns a \ref GraphWriter class.
 		  /// \relates GraphWriter
 		  template <typename Graph>
 		  GraphWriter<Graph> graphWriter(const Graph& graph, const char* fn) {
 		    GraphWriter<Graph> tmp(graph, fn);
 		    return tmp;
+		  }
 		  class SectionWriter;
 		  SectionWriter sectionWriter(std::istream& is);
 		  SectionWriter sectionWriter(const std::string& fn);
 		  SectionWriter sectionWriter(const char* fn);
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief Section writer class
 		  ///
 		  /// In the \ref lgf-format "LGF" file extra sections can be placed,
 		  /// which contain any data in arbitrary format. Such sections can be
 		  /// written with this class. A writing rule can be added to the
 		  /// class with two different functions. With the \c sectionLines()
 		  /// function a generator can write the section line-by-line, while
 		  /// with the \c sectionStream() member the section can be written to
 		  /// an output stream.
 		  class SectionWriter {
 		  private:
 		    std::ostream* _os;
 		    bool local_os;
 		    typedef std::vector<std::pair<std::string, _writer_bits::Section*> >
 		    Sections;
 		    Sections _sections;
 		  public:
 		    /// \brief Constructor
 		    ///
 		    /// Construct a section writer, which writes to the given output
 		    /// stream.
 		    SectionWriter(std::ostream& os)
 		      : _os(&os), local_os(false) {}
 		    /// \brief Constructor
 		    ///
 		    /// Construct a section writer, which writes into the given file.
 		    SectionWriter(const std::string& fn)
 		      : _os(new std::ofstream(fn.c_str())), local_os(true) {
 		      if (!(*_os)) {
 		        delete _os;
 		        throw IoError("Cannot write file", fn);
+		      }
+		    }
 		    /// \brief Constructor
 		    ///
 		    /// Construct a section writer, which writes into the given file.
 		    SectionWriter(const char* fn)
 		      : _os(new std::ofstream(fn)), local_os(true) {
 		      if (!(*_os)) {
 		        delete _os;
 		        throw IoError("Cannot write file", fn);
+		      }
+		    }
 		    /// \brief Destructor
 		    ~SectionWriter() {
 		      for (Sections::iterator it = _sections.begin();
 		           it != _sections.end(); ++it) {
 		        delete it->second;
+		      }
 		      if (local_os) {
 		        delete _os;
+		      }
+		    }
 		  private:
 		    friend SectionWriter sectionWriter(std::ostream& os);
 		    friend SectionWriter sectionWriter(const std::string& fn);
 		    friend SectionWriter sectionWriter(const char* fn);
 		    SectionWriter(SectionWriter& other)
 		      : _os(other._os), local_os(other.local_os) {
 		      other._os = 0;
 		      other.local_os = false;
 		      _sections.swap(other._sections);
+		    }
 		    SectionWriter& operator=(const SectionWriter&);
 		  public:
-		    /// \name Section writers
+		    /// \name Section Writers
 		    /// @{
 		    /// \brief Add a section writer with line oriented writing
 		    ///
 		    /// The first parameter is the type descriptor of the section, the
 		    /// second is a generator with std::string values. At the writing
 		    /// process, the returned \c std::string will be written into the
 		    /// output file until it is an empty string.
 		    ///
 		    /// For example, an integer vector is written into a section.
 		    ///\code
 		    ///  @numbers
 		    ///  12 45 23 78
 		    ///  4 28 38 28
 		    ///  23 6 16
 		    ///\endcode
 		    ///
 		    /// The generator is implemented as a struct.
 		    ///\code
 		    ///  struct NumberSection {
 		    ///    std::vector<int>::const_iterator _it, _end;
 		    ///    NumberSection(const std::vector<int>& data)
 		    ///      : _it(data.begin()), _end(data.end()) {}
 		    ///    std::string operator()() {
 		    ///      int rem_in_line = 4;
 		    ///      std::ostringstream ls;
 		    ///      while (rem_in_line > 0 && _it != _end) {
 		    ///        ls << *(_it++) << ' ';
 		    ///        --rem_in_line;
 		    ///      }
 		    ///      return ls.str();
 		    ///    }
 		    ///  };
 		    ///
 		    ///  // ...
 		    ///
 		    ///  writer.sectionLines("numbers", NumberSection(vec));
 		    ///\endcode
 		    template <typename Functor>
 		    SectionWriter& sectionLines(const std::string& type, Functor functor) {
 		      LEMON_ASSERT(!type.empty(), "Type is empty.");
 		      _sections.push_back(std::make_pair(type,
 		        new _writer_bits::LineSection<Functor>(functor)));
 		      return *this;
+		    }
 		    /// \brief Add a section writer with stream oriented writing
 		    ///
 		    /// The first parameter is the type of the section, the second is
 		    /// a functor, which takes a \c std::ostream& parameter. The
 		    /// functor writes the section to the output stream.
 		    /// \warning The last line must be closed with end-line character.
 		    template <typename Functor>
 		    SectionWriter& sectionStream(const std::string& type, Functor functor) {
 		      LEMON_ASSERT(!type.empty(), "Type is empty.");
 		      _sections.push_back(std::make_pair(type,
 		         new _writer_bits::StreamSection<Functor>(functor)));
 		      return *this;
+		    }
 		    /// @}
 		  public:
-		    /// \name Execution of the writer
+		    /// \name Execution of the Writer
 		    /// @{
 		    /// \brief Start the batch processing
 		    ///
 		    /// This function starts the batch processing.
 		    void run() {
 		      LEMON_ASSERT(_os != 0, "This writer is assigned to an other writer");
 		      for (Sections::iterator it = _sections.begin();
 		           it != _sections.end(); ++it) {
 		        (*_os) << '@' << it->first << std::endl;
 		        it->second->process(*_os);
+		      }
+		    }
 		    /// \brief Give back the stream of the writer
 		    ///
 		    /// Returns the stream of the writer
 		    std::ostream& ostream() {
 		      return *_os;
+		    }
 		    /// @}
 		  };
 		  /// \brief Return a \ref SectionWriter class
 		  ///
 		  /// This function just returns a \ref SectionWriter class.
 		  /// \relates SectionWriter
 		  inline SectionWriter sectionWriter(std::ostream& os) {
 		    SectionWriter tmp(os);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref SectionWriter class
 		  ///
 		  /// This function just returns a \ref SectionWriter class.
 		  /// \relates SectionWriter
 		  inline SectionWriter sectionWriter(const std::string& fn) {
 		    SectionWriter tmp(fn);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref SectionWriter class
 		  ///
 		  /// This function just returns a \ref SectionWriter class.
 		  /// \relates SectionWriter
 		  inline SectionWriter sectionWriter(const char* fn) {
 		    SectionWriter tmp(fn);
 		    return tmp;
+		  }
+		}
 		#endif

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