LEMON/LEMON-main Changeset - r331:2f5c0c42a5cd

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Changeset - r331:2f5c0c42a5cd

« 329:d900fd
« 325:0fbbb4

332:3f9f35 »

r331:2f5c0c42a5cd

Wed, 22 Oct 2008 15:37:43

[Not Reviewed]

0 comments (0 inline)

alpar (Alpar Juttner)
alpar@cs.elte.hu

Merge

0 4 0

merge default

1 file changed with 32 insertions and 22 deletions:

lemon/bfs.h

lemon/list_graph.h

lemon/smart_graph.h

scripts/unify-sources.sh

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lemon/bfs.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) 2003-2008
 		 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
 		 * (Egervary Research Group on Combinatorial Optimization, EGRES).
+		 *
 		 * Permission to use, modify and distribute this software is granted
 		 * provided that this copyright notice appears in all copies. For
 		 * precise terms see the accompanying LICENSE file.
+		 *
 		 * This software is provided "AS IS" with no warranty of any kind,
 		 * express or implied, and with no claim as to its suitability for any
 		 * purpose.
+		 *
 		 */
 		#ifndef LEMON_BFS_H
 		#define LEMON_BFS_H
 		///\ingroup search
 		///\file
 		///\brief BFS 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 Bfs class.
 		  ///Default traits class of Bfs class.
 		  ///\tparam GR Digraph type.
 		  template<class GR>
 		  struct BfsDefaultTraits
+		  {
 		    ///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 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 PredMap.
 		    ///This function instantiates a PredMap.
+		    ///This function instantiates a PredMap.
 		    ///\param g is the digraph, to which we would like to define the
 		    ///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 ProcessedMap.
 		    ///This function instantiates a ProcessedMap.
 		    ///\param g is the digraph, to which
 		    ///we would like to define the 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.
 		    ///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 ReachedMap.
 		    ///This function instantiates a ReachedMap.
 		    ///\param g is the digraph, to which
 		    ///we would like to define the 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 DistMap.
 		    ///This function instantiates a DistMap.
 		    ///\param g is the digraph, to which we would like to define the
 		    ///DistMap.
 		    static DistMap *createDistMap(const Digraph &g)
+		    {
 		      return new DistMap(g);
+		    }
 		  };
 		  ///%BFS algorithm class.
 		  ///\ingroup search
 		  ///This class provides an efficient implementation of the %BFS algorithm.
 		  ///
 		  ///There is also a \ref bfs() "function-type interface" for the BFS
 		  ///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 value is \ref ListDigraph. The value of GR is not used
 		  ///directly by \ref Bfs, it is only passed to \ref BfsDefaultTraits.
 		  ///\tparam TR Traits class to set various data types used by the algorithm.
 		  ///The default traits class is
 		  ///\ref BfsDefaultTraits "BfsDefaultTraits<GR>".
 		  ///See \ref BfsDefaultTraits for the documentation of
 		  ///a Bfs traits class.
 		#ifdef DOXYGEN
 		  template <typename GR,
 		            typename TR>
 		#else
 		  template <typename GR=ListDigraph,
 		            typename TR=BfsDefaultTraits<GR> >
 		#endif
 		  class Bfs {
 		  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
 		    ///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 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 traits class.
 		    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::Node> _queue;
 		    int _queue_head,_queue_tail,_queue_next_dist;
 		    int _curr_dist;
 		    //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:
 		    Bfs() {}
 		  public:
 		    typedef Bfs Create;
 		    ///\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
 		    ///PredMap type.
 		    ///
 		    ///\ref named-templ-param "Named parameter" for setting
 		    ///PredMap type.
 		    template <class T>
 		    struct SetPredMap : public Bfs< Digraph, SetPredMapTraits<T> > {
 		      typedef Bfs< 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
 		    ///DistMap type.
 		    ///
 		    ///\ref named-templ-param "Named parameter" for setting
 		    ///DistMap type.
 		    template <class T>
 		    struct SetDistMap : public Bfs< Digraph, SetDistMapTraits<T> > {
 		      typedef Bfs< 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
 		    ///ReachedMap type.
 		    ///
 		    ///\ref named-templ-param "Named parameter" for setting
 		    ///ReachedMap type.
 		    template <class T>
 		    struct SetReachedMap : public Bfs< Digraph, SetReachedMapTraits<T> > {
 		      typedef Bfs< 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
 		    ///ProcessedMap type.
 		    ///
 		    ///\ref named-templ-param "Named parameter" for setting
 		    ///ProcessedMap type.
 		    template <class T>
 		    struct SetProcessedMap : public Bfs< Digraph, SetProcessedMapTraits<T> > {
 		      typedef Bfs< 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);
 		        return 0; // ignore warnings
+		      }
 		    };
 		    ///\brief \ref named-templ-param "Named parameter" for setting
 		    ///ProcessedMap type to be <tt>Digraph::NodeMap<bool></tt>.
 		    ///
 		    ///\ref named-templ-param "Named parameter" for setting
 		    ///ProcessedMap type to be <tt>Digraph::NodeMap<bool></tt>.
 		    ///If you don't set it explicitly, it will be automatically allocated.
 		    struct SetStandardProcessedMap :
 		      public Bfs< Digraph, SetStandardProcessedMapTraits > {
 		      typedef Bfs< Digraph, SetStandardProcessedMapTraits > Create;
 		    };
 		    ///@}
 		  public:
 		    ///Constructor.
 		    ///Constructor.
 		    ///\param g The digraph the algorithm runs on.
 		    Bfs(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.
 		    ~Bfs()
+		    {
 		      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(),
 		    ///it will allocate one. The destructor deallocates this
 		    ///automatically allocated map, of course.
 		    ///\return <tt> (*this) </tt>
 		    Bfs &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(),
 		    ///it will allocate one. The destructor deallocates this
 		    ///automatically allocated map, of course.
 		    ///\return <tt> (*this) </tt>
 		    Bfs &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(),
 		    ///it will allocate one. The destructor deallocates this
 		    ///automatically allocated map, of course.
 		    ///\return <tt> (*this) </tt>
 		    Bfs &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(),
 		    ///it will allocate one. The destructor deallocates this
 		    ///automatically allocated map, of course.
 		    ///\return <tt> (*this) </tt>
 		    Bfs &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 algorithm is to use
 		    ///one of the member functions called \ref lemon::Bfs::run() "run()".
 		    ///\n
 		    ///If you need more control on the execution, first you must call
 		    ///\ref lemon::Bfs::init() "init()", then you can add several source
 		    ///nodes with \ref lemon::Bfs::addSource() "addSource()".
 		    ///Finally \ref lemon::Bfs::start() "start()" will perform the
 		    ///actual path computation.
 		    ///@{
 		    ///Initializes the internal data structures.
 		    ///Initializes the internal data structures.
 		    ///
 		    void init()
+		    {
 		      create_maps();
 		      _queue.resize(countNodes(*G));
 		      _queue_head=_queue_tail=0;
 		      _curr_dist=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.
 		    ///
 		    void addSource(Node s)
+		    {
 		      if(!(*_reached)[s])
+		        {
 		          _reached->set(s,true);
 		          _pred->set(s,INVALID);
 		          _dist->set(s,0);
 		          _queue[_queue_head++]=s;
 		          _queue_next_dist=_queue_head;
+		        }
+		    }
 		    ///Processes the next node.
 		    ///Processes the next node.
 		    ///
 		    ///\return The processed node.
 		    ///
 		    ///\pre The queue must not be empty.
 		    Node processNextNode()
+		    {
 		      if(_queue_tail==_queue_next_dist) {
 		        _curr_dist++;
 		        _queue_next_dist=_queue_head;
+		      }
 		      Node n=_queue[_queue_tail++];
 		      _processed->set(n,true);
 		      Node m;
 		      for(OutArcIt e(*G,n);e!=INVALID;++e)
 		        if(!(*_reached)[m=G->target(e)]) {
 		          _queue[_queue_head++]=m;
 		          _reached->set(m,true);
 		          _pred->set(m,e);
 		          _dist->set(m,_curr_dist);
+		        }
 		      return n;
+		    }
 		    ///Processes the next node.
 		    ///Processes the next node and checks if the given target node
 		    ///is reached. If the target node is reachable from the processed
 		    ///node, then the \c reach parameter will be set to \c true.
 		    ///
 		    ///\param target The target node.
 		    ///\retval reach Indicates if the target node is reached.
 		    ///It should be initially \c false.
 		    ///
 		    ///\return The processed node.
 		    ///
 		    ///\pre The queue must not be empty.
 		    Node processNextNode(Node target, bool& reach)
+		    {
 		      if(_queue_tail==_queue_next_dist) {
 		        _curr_dist++;
 		        _queue_next_dist=_queue_head;
+		      }
 		      Node n=_queue[_queue_tail++];
 		      _processed->set(n,true);
 		      Node m;
 		      for(OutArcIt e(*G,n);e!=INVALID;++e)
 		        if(!(*_reached)[m=G->target(e)]) {
 		          _queue[_queue_head++]=m;
 		          _reached->set(m,true);
 		          _pred->set(m,e);
 		          _dist->set(m,_curr_dist);
 		          reach = reach || (target == m);
+		        }
 		      return n;
+		    }
 		    ///Processes the next node.
 		    ///Processes the next node and checks if at least one of reached
 		    ///nodes has \c true value in the \c nm node map. If one node
 		    ///with \c true value is reachable from the processed node, then the
 		    ///\c rnode parameter will be set to the first of such nodes.
 		    ///
 		    ///\param nm A \c bool (or convertible) node map that indicates the
 		    ///possible targets.
 		    ///\retval rnode The reached target node.
 		    ///It should be initially \c INVALID.
 		    ///
 		    ///\return The processed node.
 		    ///
 		    ///\pre The queue must not be empty.
 		    template<class NM>
 		    Node processNextNode(const NM& nm, Node& rnode)
+		    {
 		      if(_queue_tail==_queue_next_dist) {
 		        _curr_dist++;
 		        _queue_next_dist=_queue_head;
+		      }
 		      Node n=_queue[_queue_tail++];
 		      _processed->set(n,true);
 		      Node m;
 		      for(OutArcIt e(*G,n);e!=INVALID;++e)
 		        if(!(*_reached)[m=G->target(e)]) {
 		          _queue[_queue_head++]=m;
 		          _reached->set(m,true);
 		          _pred->set(m,e);
 		          _dist->set(m,_curr_dist);
 		          if (nm[m] && rnode == INVALID) rnode = m;
+		        }
 		      return n;
+		    }
 		    ///The next node to be processed.
 		    ///Returns the next node to be processed or \c INVALID if the queue
 		    ///is empty.
 		    Node nextNode() const
+		    {
 		      return _queue_tail<_queue_head?_queue[_queue_tail]:INVALID;
+		    }
 		    ///\brief Returns \c false if there are nodes
 		    ///to be processed.
 		    ///
 		    ///Returns \c false if there are nodes
 		    ///to be processed in the queue.
 		    bool emptyQueue() const { return _queue_tail==_queue_head; }
 		    ///Returns the number of the nodes to be processed.
 		    ///Returns the number of the nodes to be processed in the queue.
 		    int queueSize() const { return _queue_head-_queue_tail; }
 		    ///Executes the algorithm.
 		    ///Executes the algorithm.
 		    ///
 		    ///This method runs the %BFS algorithm from the root node(s)
 		    ///in order to compute the shortest path to each node.
 		    ///
 		    ///The algorithm computes
 		    ///- the shortest path tree (forest),
 		    ///- the distance of each node from the root(s).
 		    ///
 		    ///\pre init() must be called and at least one root node should be
 		    ///added with addSource() before using this function.
 		    ///
 		    ///\note <tt>b.start()</tt> is just a shortcut of the following code.
 		    ///\code
 		    ///  while ( !b.emptyQueue() ) {
 		    ///    b.processNextNode();
 		    ///  }
 		    ///\endcode
 		    void start()
+		    {
 		      while ( !emptyQueue() ) processNextNode();
+		    }
 		    ///Executes the algorithm until the given target node is reached.
 		    ///Executes the algorithm until the given target node is reached.
 		    ///
 		    ///This method runs the %BFS algorithm from the root node(s)
 		    ///in order to compute the shortest path to \c t.
 		    ///
 		    ///The algorithm computes
 		    ///- the shortest path to \c t,
 		    ///- the distance of \c t from the root(s).
 		    ///
 		    ///\pre init() must be called and at least one root node should be
 		    ///added with addSource() before using this function.
 		    ///
 		    ///\note <tt>b.start(t)</tt> is just a shortcut of the following code.
 		    ///\code
 		    ///  bool reach = false;
 		    ///  while ( !b.emptyQueue() && !reach ) {
 		    ///    b.processNextNode(t, reach);
 		    ///  }
 		    ///\endcode
 		    void start(Node t)
+		    {
 		      bool reach = false;
 		      while ( !emptyQueue() && !reach ) processNextNode(t, reach);
+		    }
 		    ///Executes the algorithm until a condition is met.
 		    ///Executes the algorithm until a condition is met.
 		    ///
 		    ///This method runs the %BFS algorithm from the root node(s) in
 		    ///order to compute the shortest path to a node \c v with
 		    /// <tt>nm[v]</tt> true, if such a node can be found.
 		    ///
 		    ///\param nm A \c bool (or convertible) node map. The algorithm
 		    ///will stop when it reaches a node \c v with <tt>nm[v]</tt> true.
 		    ///
 		    ///\return The reached node \c v with <tt>nm[v]</tt> true or
 		    ///\c INVALID if no such node was found.
 		    ///
 		    ///\pre init() must be called and at least one root node should be
 		    ///added with addSource() before using this function.
 		    ///
 		    ///\note <tt>b.start(nm)</tt> is just a shortcut of the following code.
 		    ///\code
 		    ///  Node rnode = INVALID;
 		    ///  while ( !b.emptyQueue() && rnode == INVALID ) {
 		    ///    b.processNextNode(nm, rnode);
 		    ///  }
 		    ///  return rnode;
 		    ///\endcode
 		    template<class NodeBoolMap>
 		    Node start(const NodeBoolMap &nm)
+		    {
 		      Node rnode = INVALID;
 		      while ( !emptyQueue() && rnode == INVALID ) {
 		        processNextNode(nm, rnode);
+		      }
 		      return rnode;
+		    }
 		    ///Runs the algorithm from the given source node.
 		    ///This method runs the %BFS algorithm from node \c s
 		    ///in order to compute the shortest path to each node.
 		    ///
 		    ///The algorithm computes
 		    ///- the shortest path tree,
 		    ///- the distance of each node from the root.
 		    ///
 		    ///\note <tt>b.run(s)</tt> is just a shortcut of the following code.
 		    ///\code
 		    ///  b.init();
 		    ///  b.addSource(s);
 		    ///  b.start();
 		    ///\endcode
 		    void run(Node s) {
 		      init();
 		      addSource(s);
 		      start();
+		    }
 		    ///Finds the shortest path between \c s and \c t.
 		    ///This method runs the %BFS algorithm from node \c s
 		    ///in order to compute the shortest path to node \c t
 		    ///(it stops searching when \c t is processed).
 		    ///
 		    ///\return \c true if \c t is reachable form \c s.
 		    ///
 		    ///\note Apart from the return value, <tt>b.run(s,t)</tt> is just a
 		    ///shortcut of the following code.
 		    ///\code
 		    ///  b.init();
 		    ///  b.addSource(s);
 		    ///  b.start(t);
 		    ///\endcode
 		    bool run(Node s,Node t) {
 		      init();
 		      addSource(s);
 		      start(t);
 		      return reached(t);
+		    }
 		    ///Runs the algorithm to visit all nodes in the digraph.
 		    ///This method runs the %BFS algorithm in order to
 		    ///compute the shortest path to each node.
 		    ///
 		    ///The algorithm computes
 		    ///- the shortest path tree (forest),
 		    ///- the distance of each node from the root(s).
 		    ///
 		    ///\note <tt>b.run(s)</tt> is just a shortcut of the following code.
 		    ///\code
 		    ///  b.init();
 		    ///  for (NodeIt n(gr); n != INVALID; ++n) {
 		    ///    if (!b.reached(n)) {
 		    ///      b.addSource(n);
 		    ///      b.start();
 		    ///    }
 		    ///  }
 		    ///\endcode
 		    void run() {
 		      init();
 		      for (NodeIt n(*G); n != INVALID; ++n) {
 		        if (!reached(n)) {
 		          addSource(n);
 		          start();
+		        }
+		      }
+		    }
 		    ///@}
 		    ///\name Query Functions
 		    ///The result of the %BFS algorithm can be obtained using these
 		    ///functions.\n
 		    ///Either \ref lemon::Bfs::run() "run()" or \ref lemon::Bfs::start()
 		    ///"start()" must be called before using them.
 		    ///@{
 		    ///The shortest path to a node.
 		    ///Returns the shortest path to a node.
 		    ///
 		    ///\warning \c t should be reachable from the root(s).
 		    ///
 		    ///\pre Either \ref run() or \ref start() must be called before
 		    ///using this function.
 		    Path path(Node t) const { return Path(*G, *_pred, t); }
 		    ///The distance of a node from the root(s).
 		    ///Returns the distance of a node from the root(s).
 		    ///
 		    ///\warning If node \c v is not reachable from the root(s), then
 		    ///the return value of this function is undefined.
 		    ///
 		    ///\pre Either \ref run() or \ref start() must be called before
 		    ///using this function.
 		    int dist(Node v) const { return (*_dist)[v]; }
 		    ///Returns the 'previous arc' of the shortest path tree for a node.
 		    ///This function returns the 'previous arc' of the shortest path
 		    ///tree for the node \c v, i.e. it returns the last arc of a
 		    ///shortest path from the root(s) to \c v. It is \c INVALID if \c v
 		    ///is not reachable from the root(s) or if \c v is a root.
 		    ///
 		    ///The shortest path tree used here is equal to the shortest path
 		    ///tree used in \ref predNode().
 		    ///
 		    ///\pre Either \ref run() or \ref start() must be called before
 		    ///using this function.
 		    Arc predArc(Node v) const { return (*_pred)[v];}
 		    ///Returns the 'previous node' of the shortest path tree for a node.
 		    ///This function returns the 'previous node' of the shortest path
 		    ///tree for the node \c v, i.e. it returns the last but one node
 		    ///from a shortest path from the root(s) to \c v. It is \c INVALID
 		    ///if \c v is not reachable from the root(s) or if \c v is a root.
 		    ///
 		    ///The shortest path tree used here is equal to the shortest path
 		    ///tree used in \ref predArc().
 		    ///
 		    ///\pre Either \ref run() or \ref start() must be called before
 		    ///using this function.
 		    Node predNode(Node v) const { return (*_pred)[v]==INVALID ? INVALID:
 		                                  G->source((*_pred)[v]); }
 		    ///\brief Returns a const reference to the node map that stores the
 		    /// distances of the nodes.
 		    ///
 		    ///Returns a const reference to the node map that stores the distances
 		    ///of the nodes calculated by the algorithm.
 		    ///
 		    ///\pre Either \ref run() or \ref init()
 		    ///must be called before using this function.
 		    const DistMap &distMap() const { return *_dist;}
 		    ///\brief Returns a const reference to the node map that stores the
 		    ///predecessor arcs.
 		    ///
 		    ///Returns a const reference to the node map that stores the predecessor
 		    ///arcs, which form the shortest path tree.
 		    ///
 		    ///\pre Either \ref run() or \ref init()
 		    ///must be called before using this function.
 		    const PredMap &predMap() const { return *_pred;}
 		    ///Checks if a node is reachable from the root(s).
 		    ///Returns \c true if \c v is reachable from the root(s).
 		    ///\pre Either \ref run() or \ref start()
 		    ///must be called before using this function.
 		    bool reached(Node v) const { return (*_reached)[v]; }
 		    ///@}
 		  };
 		  ///Default traits class of bfs() function.
 		  ///Default traits class of bfs() function.
 		  ///\tparam GR Digraph type.
 		  template<class GR>
 		  struct BfsWizardDefaultTraits
+		  {
 		    ///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 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 PredMap.
 		    ///This function instantiates a PredMap.
 		    ///\param g is the digraph, to which we would like to define the
 		    ///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 ProcessedMap.
 		    ///This function instantiates a ProcessedMap.
 		    ///\param g is the digraph, to which
 		    ///we would like to define the 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 ReachedMap.
 		    ///This function instantiates a ReachedMap.
 		    ///\param g is the digraph, to which
 		    ///we would like to define the 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 DistMap.
 		    ///This function instantiates a DistMap.
 		    ///\param g is the digraph, to which we would like to define
 		    ///the DistMap
 		    static DistMap *createDistMap(const Digraph &g)
+		    {
 		      return new DistMap(g);
+		    }
 		    ///The type of the shortest paths.
 		    ///The type of the shortest paths.
 		    ///It must meet the \ref concepts::Path "Path" concept.
 		    typedef lemon::Path<Digraph> Path;
 		  };
 		  /// Default traits class used by BfsWizard
 		  /// To make it easier to use Bfs algorithm
 		  /// we have created a wizard class.
 		  /// This \ref BfsWizard class needs default traits,
 		  /// as well as the \ref Bfs class.
 		  /// The \ref BfsWizardBase is a class to be the default traits of the
 		  /// \ref BfsWizard class.
 		  template<class GR>
 		  class BfsWizardBase : public BfsWizardDefaultTraits<GR>
+		  {
 		    typedef BfsWizardDefaultTraits<GR> Base;
 		  protected:
 		    //The type of the nodes in the digraph.
 		    typedef typename Base::Digraph::Node Node;
 		    //Pointer to the digraph the algorithm runs on.
 		    void *_g;
 		    //Pointer to the map of reached nodes.
 		    void *_reached;
 		    //Pointer to the map of processed nodes.
 		    void *_processed;
 		    //Pointer to the map of predecessors arcs.
 		    void *_pred;
 		    //Pointer to the map of distances.
 		    void *_dist;
 		    //Pointer to the shortest path to the target node.
 		    void *_path;
 		    //Pointer to the distance of the target node.
 		    int *_di;
 		    public:
 		    /// Constructor.
 		    /// This constructor does not require parameters, therefore it initiates
 		    /// all of the attributes to \c 0.
 		    BfsWizardBase() : _g(0), _reached(0), _processed(0), _pred(0),
 		                      _dist(0), _path(0), _di(0) {}
 		    /// Constructor.
 		    /// This constructor requires one parameter,
 		    /// others are initiated to \c 0.
 		    /// \param g The digraph the algorithm runs on.
 		    BfsWizardBase(const GR &g) :
 		      _g(reinterpret_cast<void*>(const_cast<GR*>(&g))),
 		      _reached(0), _processed(0), _pred(0), _dist(0),  _path(0), _di(0) {}
 		  };
 		  /// Auxiliary class for the function-type interface of BFS algorithm.
 		  /// This auxiliary class is created to implement the
 		  /// \ref bfs() "function-type interface" of \ref Bfs algorithm.
 		  /// It does not have own \ref run() method, it uses the functions
 		  /// and features of the plain \ref Bfs.
 		  ///
 		  /// This class should only be used through the \ref bfs() function,
 		  /// which makes it easier to use the algorithm.
 		  template<class TR>
 		  class BfsWizard : public TR
+		  {
 		    typedef TR Base;
 		    ///The type of the digraph the algorithm runs on.
 		    typedef typename TR::Digraph Digraph;
 		    typedef typename Digraph::Node Node;
 		    typedef typename Digraph::NodeIt NodeIt;
 		    typedef typename Digraph::Arc Arc;
 		    typedef typename Digraph::OutArcIt OutArcIt;
 		    ///\brief The type of the map that stores the predecessor
 		    ///arcs of the shortest paths.
 		    typedef typename TR::PredMap PredMap;
 		    ///\brief The type of the map that stores the distances of the nodes.
 		    typedef typename TR::DistMap DistMap;
 		    ///\brief The type of the map that indicates which nodes are reached.
 		    typedef typename TR::ReachedMap ReachedMap;
 		    ///\brief The type of the map that indicates which nodes are processed.
 		    typedef typename TR::ProcessedMap ProcessedMap;
 		    ///The type of the shortest paths
 		    typedef typename TR::Path Path;
 		  public:
 		    /// Constructor.
 		    BfsWizard() : TR() {}
 		    /// Constructor that requires parameters.
 		    /// Constructor that requires parameters.
 		    /// These parameters will be the default values for the traits class.
 		    /// \param g The digraph the algorithm runs on.
 		    BfsWizard(const Digraph &g) :
 		      TR(g) {}
 		    ///Copy constructor
 		    BfsWizard(const TR &b) : TR(b) {}
 		    ~BfsWizard() {}
 		    ///Runs BFS algorithm from the given source node.
 		    ///This method runs BFS algorithm from node \c s
 		    ///in order to compute the shortest path to each node.
 		    void run(Node s)
+		    {
 		      Bfs<Digraph,TR> alg(*reinterpret_cast<const Digraph*>(Base::_g));
 		      if (Base::_pred)
 		        alg.predMap(*reinterpret_cast<PredMap*>(Base::_pred));
 		      if (Base::_dist)
 		        alg.distMap(*reinterpret_cast<DistMap*>(Base::_dist));
 		      if (Base::_reached)
 		        alg.reachedMap(*reinterpret_cast<ReachedMap*>(Base::_reached));
 		      if (Base::_processed)
 		        alg.processedMap(*reinterpret_cast<ProcessedMap*>(Base::_processed));
 		      if (s!=INVALID)
 		        alg.run(s);
 		      else
 		        alg.run();
+		    }
 		    ///Finds the shortest path between \c s and \c t.
 		    ///This method runs BFS algorithm from node \c s
 		    ///in order to compute the shortest path to node \c t
 		    ///(it stops searching when \c t is processed).
 		    ///
 		    ///\return \c true if \c t is reachable form \c s.
 		    bool run(Node s, Node t)
+		    {
 		      Bfs<Digraph,TR> alg(*reinterpret_cast<const Digraph*>(Base::_g));
 		      if (Base::_pred)
 		        alg.predMap(*reinterpret_cast<PredMap*>(Base::_pred));
 		      if (Base::_dist)
 		        alg.distMap(*reinterpret_cast<DistMap*>(Base::_dist));
 		      if (Base::_reached)
 		        alg.reachedMap(*reinterpret_cast<ReachedMap*>(Base::_reached));
 		      if (Base::_processed)
 		        alg.processedMap(*reinterpret_cast<ProcessedMap*>(Base::_processed));
 		      alg.run(s,t);
 		      if (Base::_path)
 		        *reinterpret_cast<Path*>(Base::_path) = alg.path(t);
 		      if (Base::_di)
 		        *Base::_di = alg.dist(t);
 		      return alg.reached(t);
+		    }
 		    ///Runs BFS algorithm to visit all nodes in the digraph.
 		    ///This method runs BFS algorithm in order to compute
 		    ///the shortest path to each node.
 		    void run()
+		    {
 		      run(INVALID);
+		    }
 		    template<class T>
 		    struct SetPredMapBase : public Base {
 		      typedef T PredMap;
 		      static PredMap *createPredMap(const Digraph &) { return 0; };
 		      SetPredMapBase(const TR &b) : TR(b) {}
 		    };
 		    ///\brief \ref named-func-param "Named parameter"
 		    ///for setting PredMap object.
 		    ///
 		    ///\ref named-func-param "Named parameter"
 		    ///for setting PredMap object.
 		    template<class T>
 		    BfsWizard<SetPredMapBase<T> > predMap(const T &t)
+		    {
 		      Base::_pred=reinterpret_cast<void*>(const_cast<T*>(&t));
 		      return BfsWizard<SetPredMapBase<T> >(*this);
+		    }
 		    template<class T>
 		    struct SetReachedMapBase : public Base {
 		      typedef T ReachedMap;
 		      static ReachedMap *createReachedMap(const Digraph &) { return 0; };
 		      SetReachedMapBase(const TR &b) : TR(b) {}
 		    };
 		    ///\brief \ref named-func-param "Named parameter"
 		    ///for setting ReachedMap object.
 		    ///
 		    /// \ref named-func-param "Named parameter"
 		    ///for setting ReachedMap object.
 		    template<class T>
 		    BfsWizard<SetReachedMapBase<T> > reachedMap(const T &t)
+		    {
 		      Base::_reached=reinterpret_cast<void*>(const_cast<T*>(&t));
 		      return BfsWizard<SetReachedMapBase<T> >(*this);
+		    }
 		    template<class T>
 		    struct SetDistMapBase : public Base {
 		      typedef T DistMap;
 		      static DistMap *createDistMap(const Digraph &) { return 0; };
 		      SetDistMapBase(const TR &b) : TR(b) {}
 		    };
 		    ///\brief \ref named-func-param "Named parameter"
 		    ///for setting DistMap object.
 		    ///
 		    /// \ref named-func-param "Named parameter"
 		    ///for setting DistMap object.
 		    template<class T>
 		    BfsWizard<SetDistMapBase<T> > distMap(const T &t)
+		    {
 		      Base::_dist=reinterpret_cast<void*>(const_cast<T*>(&t));
 		      return BfsWizard<SetDistMapBase<T> >(*this);
+		    }
 		    template<class T>
 		    struct SetProcessedMapBase : public Base {
 		      typedef T ProcessedMap;
 		      static ProcessedMap *createProcessedMap(const Digraph &) { return 0; };
 		      SetProcessedMapBase(const TR &b) : TR(b) {}
 		    };
 		    ///\brief \ref named-func-param "Named parameter"
 		    ///for setting ProcessedMap object.
 		    ///
 		    /// \ref named-func-param "Named parameter"
 		    ///for setting ProcessedMap object.
 		    template<class T>
 		    BfsWizard<SetProcessedMapBase<T> > processedMap(const T &t)
+		    {
 		      Base::_processed=reinterpret_cast<void*>(const_cast<T*>(&t));
 		      return BfsWizard<SetProcessedMapBase<T> >(*this);
+		    }
 		    template<class T>
 		    struct SetPathBase : public Base {
 		      typedef T Path;
 		      SetPathBase(const TR &b) : TR(b) {}
 		    };
 		    ///\brief \ref named-func-param "Named parameter"
 		    ///for getting the shortest path to the target node.
 		    ///
 		    ///\ref named-func-param "Named parameter"
 		    ///for getting the shortest path to the target node.
 		    template<class T>
 		    BfsWizard<SetPathBase<T> > path(const T &t)
+		    {
 		      Base::_path=reinterpret_cast<void*>(const_cast<T*>(&t));
 		      return BfsWizard<SetPathBase<T> >(*this);
+		    }
 		    ///\brief \ref named-func-param "Named parameter"
 		    ///for getting the distance of the target node.
 		    ///
 		    ///\ref named-func-param "Named parameter"
 		    ///for getting the distance of the target node.
 		    BfsWizard dist(const int &d)
+		    {
 		      Base::_di=const_cast<int*>(&d);
 		      return *this;
+		    }
 		  };
 		  ///Function-type interface for BFS algorithm.
 		  /// \ingroup search
 		  ///Function-type interface for BFS algorithm.
 		  ///
 		  ///This function also has several \ref named-func-param "named parameters",
 		  ///they are declared as the members of class \ref BfsWizard.
 		  ///The following examples show how to use these parameters.
 		  ///\code
 		  ///  // Compute shortest path from node s to each node
 		  ///  bfs(g).predMap(preds).distMap(dists).run(s);
 		  ///
 		  ///  // Compute shortest path from s to t
 		  ///  bool reached = bfs(g).path(p).dist(d).run(s,t);
 		  ///\endcode
 		  ///\warning Don't forget to put the \ref BfsWizard::run() "run()"
 		  ///to the end of the parameter list.
 		  ///\sa BfsWizard
 		  ///\sa Bfs
 		  template<class GR>
 		  BfsWizard<BfsWizardBase<GR> >
 		  bfs(const GR &digraph)
+		  {
 		    return BfsWizard<BfsWizardBase<GR> >(digraph);
+		  }
 		#ifdef DOXYGEN
 		  /// \brief Visitor class for BFS.
 		  ///
 		  /// This class defines the interface of the BfsVisit events, and
 		  /// it could be the base of a real visitor class.
 		  template <typename _Digraph>
 		  struct BfsVisitor {
 		    typedef _Digraph Digraph;
 		    typedef typename Digraph::Arc Arc;
 		    typedef typename Digraph::Node Node;
 		    /// \brief Called for the source node(s) of the BFS.
 		    ///
 		    /// This function is called for the source node(s) of the BFS.
 		    void start(const Node& node) {}
 		    /// \brief Called when a node is reached first time.
 		    ///
 		    /// This function is called when a node is reached first time.
 		    void reach(const Node& node) {}
 		    /// \brief Called when a node is processed.
 		    ///
 		    /// This function is called when a node is processed.
 		    void process(const Node& node) {}
 		    /// \brief Called when an arc reaches a new node.
 		    ///
 		    /// This function is called when the BFS finds an arc whose target node
 		    /// is not reached yet.
 		    void discover(const Arc& arc) {}
 		    /// \brief Called when an arc is examined but its target node is
 		    /// already discovered.
 		    ///
 		    /// This function is called when an arc is examined but its target node is
 		    /// already discovered.
 		    void examine(const Arc& arc) {}
 		  };
 		#else
 		  template <typename _Digraph>
 		  struct BfsVisitor {
 		    typedef _Digraph Digraph;
 		    typedef typename Digraph::Arc Arc;
 		    typedef typename Digraph::Node Node;
 		    void start(const Node&) {}
 		    void reach(const Node&) {}
 		    void process(const Node&) {}
 		    void discover(const Arc&) {}
 		    void examine(const Arc&) {}
 		    template <typename _Visitor>
 		    struct Constraints {
 		      void constraints() {
 		        Arc arc;
 		        Node node;
 		        visitor.start(node);
 		        visitor.reach(node);
 		        visitor.process(node);
 		        visitor.discover(arc);
 		        visitor.examine(arc);
+		      }
 		      _Visitor& visitor;
 		    };
 		  };
 		#endif
 		  /// \brief Default traits class of BfsVisit class.
 		  ///
 		  /// Default traits class of BfsVisit class.
 		  /// \tparam _Digraph The type of the digraph the algorithm runs on.
 		  template<class _Digraph>
 		  struct BfsVisitDefaultTraits {
 		    /// \brief The type of the digraph the algorithm runs on.
 		    typedef _Digraph Digraph;
 		    /// \brief 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;
 		    /// \brief Instantiates a ReachedMap.
 		    ///
 		    /// This function instantiates a ReachedMap.
 		    /// \param digraph is the digraph, to which
 		    /// we would like to define the ReachedMap.
 		    static ReachedMap *createReachedMap(const Digraph &digraph) {
 		      return new ReachedMap(digraph);
+		    }
 		  };
 		  /// \ingroup search
 		  ///
 		  /// \brief %BFS algorithm class with visitor interface.
 		  ///
 		  /// This class provides an efficient implementation of the %BFS algorithm
 		  /// with visitor interface.
 		  ///
 		  /// The %BfsVisit class provides an alternative interface to the Bfs
 		  /// class. It works with callback mechanism, the BfsVisit object calls
 		  /// the member functions of the \c Visitor class on every BFS event.
 		  ///
 		  /// This interface of the BFS algorithm should be used in special cases
 		  /// when extra actions have to be performed in connection with certain
 		  /// events of the BFS algorithm. Otherwise consider to use Bfs or bfs()
 		  /// instead.
 		  ///
 		  /// \tparam _Digraph The type of the digraph the algorithm runs on.
 		  /// The default value is
 		  /// \ref ListDigraph. The value of _Digraph is not used directly by
 		  /// \ref BfsVisit, it is only passed to \ref BfsVisitDefaultTraits.
 		  /// \tparam _Visitor The Visitor type that is used by the algorithm.
 		  /// \ref BfsVisitor "BfsVisitor<_Digraph>" is an empty visitor, which
 		  /// does not observe the BFS events. If you want to observe the BFS
 		  /// events, you should implement your own visitor class.
 		  /// \tparam _Traits Traits class to set various data types used by the
 		  /// algorithm. The default traits class is
 		  /// \ref BfsVisitDefaultTraits "BfsVisitDefaultTraits<_Digraph>".
 		  /// See \ref BfsVisitDefaultTraits for the documentation of
 		  /// a BFS visit traits class.
 		#ifdef DOXYGEN
 		  template <typename _Digraph, typename _Visitor, typename _Traits>
 		#else
 		  template <typename _Digraph = ListDigraph,
 		            typename _Visitor = BfsVisitor<_Digraph>,
 		            typename _Traits = BfsVisitDefaultTraits<_Digraph> >
 		#endif
 		  class BfsVisit {
 		  public:
 		    ///The traits class.
 		    typedef _Traits Traits;
 		    ///The type of the digraph the algorithm runs on.
 		    typedef typename Traits::Digraph Digraph;
 		    ///The visitor type used by the algorithm.
 		    typedef _Visitor Visitor;
 		    ///The type of the map that indicates which nodes are reached.
 		    typedef typename Traits::ReachedMap ReachedMap;
 		  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 *_digraph;
 		    //Pointer to the visitor object.
 		    Visitor *_visitor;
 		    //Pointer to the map of reached status of the nodes.
 		    ReachedMap *_reached;
 		    //Indicates if _reached is locally allocated (true) or not.
 		    bool local_reached;
 		    std::vector<typename Digraph::Node> _list;
 		    int _list_front, _list_back;
 		    //Creates the maps if necessary.
 		    void create_maps() {
 		      if(!_reached) {
 		        local_reached = true;
 		        _reached = Traits::createReachedMap(*_digraph);
+		      }
+		    }
 		  protected:
 		    BfsVisit() {}
 		  public:
 		    typedef BfsVisit Create;
 		    /// \name Named template parameters
 		    ///@{
 		    template <class T>
 		    struct SetReachedMapTraits : public Traits {
 		      typedef T ReachedMap;
 		      static ReachedMap *createReachedMap(const Digraph &digraph) {
 		        LEMON_ASSERT(false, "ReachedMap is not initialized");
 		        return 0; // ignore warnings
+		      }
 		    };
 		    /// \brief \ref named-templ-param "Named parameter" for setting
 		    /// ReachedMap type.
 		    ///
 		    /// \ref named-templ-param "Named parameter" for setting ReachedMap type.
 		    template <class T>
 		    struct SetReachedMap : public BfsVisit< Digraph, Visitor,
 		                                            SetReachedMapTraits<T> > {
 		      typedef BfsVisit< Digraph, Visitor, SetReachedMapTraits<T> > Create;
 		    };
 		    ///@}
 		  public:
 		    /// \brief Constructor.
 		    ///
 		    /// Constructor.
 		    ///
 		    /// \param digraph The digraph the algorithm runs on.
 		    /// \param visitor The visitor object of the algorithm.
 		    BfsVisit(const Digraph& digraph, Visitor& visitor)
 		      : _digraph(&digraph), _visitor(&visitor),
 		        _reached(0), local_reached(false) {}
 		    /// \brief Destructor.
 		    ~BfsVisit() {
 		      if(local_reached) delete _reached;
+		    }
 		    /// \brief 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(),
 		    /// it will allocate one. The destructor deallocates this
 		    /// automatically allocated map, of course.
 		    /// \return <tt> (*this) </tt>
 		    BfsVisit &reachedMap(ReachedMap &m) {
 		      if(local_reached) {
 		        delete _reached;
 		        local_reached = false;
+		      }
 		      _reached = &m;
 		      return *this;
+		    }
 		  public:
 		    /// \name Execution control
 		    /// The simplest way to execute the algorithm is to use
 		    /// one of the member functions called \ref lemon::BfsVisit::run()
 		    /// "run()".
 		    /// \n
 		    /// If you need more control on the execution, first you must call
 		    /// \ref lemon::BfsVisit::init() "init()", then you can add several
 		    /// source nodes with \ref lemon::BfsVisit::addSource() "addSource()".
 		    /// Finally \ref lemon::BfsVisit::start() "start()" will perform the
 		    /// actual path computation.
 		    /// @{
 		    /// \brief Initializes the internal data structures.
 		    ///
 		    /// Initializes the internal data structures.
 		    void init() {
 		      create_maps();
 		      _list.resize(countNodes(*_digraph));
 		      _list_front = _list_back = -1;
 		      for (NodeIt u(*_digraph) ; u != INVALID ; ++u) {
 		        _reached->set(u, false);
+		      }
+		    }
 		    /// \brief Adds a new source node.
 		    ///
 		    /// Adds a new source node to the set of nodes to be processed.
 		    void addSource(Node s) {
 		      if(!(*_reached)[s]) {
 		          _reached->set(s,true);
 		          _visitor->start(s);
 		          _visitor->reach(s);
 		          _list[++_list_back] = s;
+		        }
+		    }
 		    /// \brief Processes the next node.
 		    ///
 		    /// Processes the next node.
 		    ///
 		    /// \return The processed node.
 		    ///
 		    /// \pre The queue must not be empty.
 		    Node processNextNode() {
 		      Node n = _list[++_list_front];
 		      _visitor->process(n);
 		      Arc e;
 		      for (_digraph->firstOut(e, n); e != INVALID; _digraph->nextOut(e)) {
 		        Node m = _digraph->target(e);
 		        if (!(*_reached)[m]) {
 		          _visitor->discover(e);
 		          _visitor->reach(m);
 		          _reached->set(m, true);
 		          _list[++_list_back] = m;
 		        } else {
 		          _visitor->examine(e);
+		        }
+		      }
 		      return n;
+		    }
 		    /// \brief Processes the next node.
 		    ///
 		    /// Processes the next node and checks if the given target node
 		    /// is reached. If the target node is reachable from the processed
 		    /// node, then the \c reach parameter will be set to \c true.
 		    ///
 		    /// \param target The target node.
 		    /// \retval reach Indicates if the target node is reached.
 		    /// It should be initially \c false.
 		    ///
 		    /// \return The processed node.
 		    ///
 		    /// \pre The queue must not be empty.
 		    Node processNextNode(Node target, bool& reach) {
 		      Node n = _list[++_list_front];
 		      _visitor->process(n);
 		      Arc e;
 		      for (_digraph->firstOut(e, n); e != INVALID; _digraph->nextOut(e)) {
 		        Node m = _digraph->target(e);
 		        if (!(*_reached)[m]) {
 		          _visitor->discover(e);
 		          _visitor->reach(m);
 		          _reached->set(m, true);
 		          _list[++_list_back] = m;
 		          reach = reach || (target == m);
 		        } else {
 		          _visitor->examine(e);
+		        }
+		      }
 		      return n;
+		    }
 		    /// \brief Processes the next node.
 		    ///
 		    /// Processes the next node and checks if at least one of reached
 		    /// nodes has \c true value in the \c nm node map. If one node
 		    /// with \c true value is reachable from the processed node, then the
 		    /// \c rnode parameter will be set to the first of such nodes.
 		    ///
 		    /// \param nm A \c bool (or convertible) node map that indicates the
 		    /// possible targets.
 		    /// \retval rnode The reached target node.
 		    /// It should be initially \c INVALID.
 		    ///
 		    /// \return The processed node.
 		    ///
 		    /// \pre The queue must not be empty.
 		    template <typename NM>
 		    Node processNextNode(const NM& nm, Node& rnode) {
 		      Node n = _list[++_list_front];
 		      _visitor->process(n);
 		      Arc e;
 		      for (_digraph->firstOut(e, n); e != INVALID; _digraph->nextOut(e)) {
 		        Node m = _digraph->target(e);
 		        if (!(*_reached)[m]) {
 		          _visitor->discover(e);
 		          _visitor->reach(m);
 		          _reached->set(m, true);
 		          _list[++_list_back] = m;
 		          if (nm[m] && rnode == INVALID) rnode = m;
 		        } else {
 		          _visitor->examine(e);
+		        }
+		      }
 		      return n;
+		    }
 		    /// \brief The next node to be processed.
 		    ///
 		    /// Returns the next node to be processed or \c INVALID if the queue
 		    /// is empty.
 		    Node nextNode() const {
 		      return _list_front != _list_back ? _list[_list_front + 1] : INVALID;
+		    }
 		    /// \brief Returns \c false if there are nodes
 		    /// to be processed.
 		    ///
 		    /// Returns \c false if there are nodes
 		    /// to be processed in the queue.
 		    bool emptyQueue() const { return _list_front == _list_back; }
 		    /// \brief Returns the number of the nodes to be processed.
 		    ///
 		    /// Returns the number of the nodes to be processed in the queue.
 		    int queueSize() const { return _list_back - _list_front; }
 		    /// \brief Executes the algorithm.
 		    ///
 		    /// Executes the algorithm.
 		    ///
 		    /// This method runs the %BFS algorithm from the root node(s)
 		    /// in order to compute the shortest path to each node.
 		    ///
 		    /// The algorithm computes
 		    /// - the shortest path tree (forest),
 		    /// - the distance of each node from the root(s).
 		    ///
 		    /// \pre init() must be called and at least one root node should be added
 		    /// with addSource() before using this function.
 		    ///
 		    /// \note <tt>b.start()</tt> is just a shortcut of the following code.
 		    /// \code
 		    ///   while ( !b.emptyQueue() ) {
 		    ///     b.processNextNode();
 		    ///   }
 		    /// \endcode
 		    void start() {
 		      while ( !emptyQueue() ) processNextNode();
+		    }
 		    /// \brief Executes the algorithm until the given target node is reached.
 		    ///
 		    /// Executes the algorithm until the given target node is reached.
 		    ///
 		    /// This method runs the %BFS algorithm from the root node(s)
 		    /// in order to compute the shortest path to \c t.
 		    ///
 		    /// The algorithm computes
 		    /// - the shortest path to \c t,
 		    /// - the distance of \c t from the root(s).
 		    ///
 		    /// \pre init() must be called and at least one root node should be
 		    /// added with addSource() before using this function.
 		    ///
 		    /// \note <tt>b.start(t)</tt> is just a shortcut of the following code.
 		    /// \code
 		    ///   bool reach = false;
 		    ///   while ( !b.emptyQueue() && !reach ) {
 		    ///     b.processNextNode(t, reach);
 		    ///   }
 		    /// \endcode
 		    void start(Node t) {
 		      bool reach = false;
 		      while ( !emptyQueue() && !reach ) processNextNode(t, reach);
+		    }
 		    /// \brief Executes the algorithm until a condition is met.
 		    ///
 		    /// Executes the algorithm until a condition is met.
 		    ///
 		    /// This method runs the %BFS algorithm from the root node(s) in
 		    /// order to compute the shortest path to a node \c v with
 		    /// <tt>nm[v]</tt> true, if such a node can be found.
 		    ///
 		    /// \param nm must be a bool (or convertible) node map. The
 		    /// algorithm will stop when it reaches a node \c v with
 		    /// <tt>nm[v]</tt> true.
 		    ///
 		    /// \return The reached node \c v with <tt>nm[v]</tt> true or
 		    /// \c INVALID if no such node was found.
 		    ///
 		    /// \pre init() must be called and at least one root node should be
 		    /// added with addSource() before using this function.
 		    ///
 		    /// \note <tt>b.start(nm)</tt> is just a shortcut of the following code.
 		    /// \code
 		    ///   Node rnode = INVALID;
 		    ///   while ( !b.emptyQueue() && rnode == INVALID ) {
 		    ///     b.processNextNode(nm, rnode);
 		    ///   }
 		    ///   return rnode;
 		    /// \endcode
 		    template <typename NM>
 		    Node start(const NM &nm) {
 		      Node rnode = INVALID;
 		      while ( !emptyQueue() && rnode == INVALID ) {
 		        processNextNode(nm, rnode);
+		      }
 		      return rnode;
+		    }
 		    /// \brief Runs the algorithm from the given source node.
 		    ///
 		    /// This method runs the %BFS algorithm from node \c s
 		    /// in order to compute the shortest path to each node.
 		    ///
 		    /// The algorithm computes
 		    /// - the shortest path tree,
 		    /// - the distance of each node from the root.
 		    ///
 		    /// \note <tt>b.run(s)</tt> is just a shortcut of the following code.
 		    ///\code
 		    ///   b.init();
 		    ///   b.addSource(s);
 		    ///   b.start();
 		    ///\endcode
 		    void run(Node s) {
 		      init();
 		      addSource(s);
 		      start();
+		    }
 		    /// \brief Finds the shortest path between \c s and \c t.
 		    ///
 		    /// This method runs the %BFS algorithm from node \c s
 		    /// in order to compute the shortest path to node \c t
 		    /// (it stops searching when \c t is processed).
 		    ///
 		    /// \return \c true if \c t is reachable form \c s.
 		    ///
 		    /// \note Apart from the return value, <tt>b.run(s,t)</tt> is just a
 		    /// shortcut of the following code.
 		    ///\code
 		    ///   b.init();
 		    ///   b.addSource(s);
 		    ///   b.start(t);
 		    ///\endcode
 		    bool run(Node s,Node t) {
 		      init();
 		      addSource(s);
 		      start(t);
 		      return reached(t);
+		    }
 		    /// \brief Runs the algorithm to visit all nodes in the digraph.
 		    ///
 		    /// This method runs the %BFS algorithm in order to
 		    /// compute the shortest path to each node.
 		    ///
 		    /// The algorithm computes
 		    /// - the shortest path tree (forest),
 		    /// - the distance of each node from the root(s).
 		    ///
 		    /// \note <tt>b.run(s)</tt> is just a shortcut of the following code.
 		    ///\code
 		    ///  b.init();
 		    ///  for (NodeIt n(gr); n != INVALID; ++n) {
 		    ///    if (!b.reached(n)) {
 		    ///      b.addSource(n);
 		    ///      b.start();
 		    ///    }
 		    ///  }
 		    ///\endcode
 		    void run() {
 		      init();
 		      for (NodeIt it(*_digraph); it != INVALID; ++it) {
 		        if (!reached(it)) {
 		          addSource(it);
 		          start();
+		        }
+		      }
+		    }
 		    ///@}
 		    /// \name Query Functions
 		    /// The result of the %BFS algorithm can be obtained using these
 		    /// functions.\n
 		    /// Either \ref lemon::BfsVisit::run() "run()" or
 		    /// \ref lemon::BfsVisit::start() "start()" must be called before
 		    /// using them.
 		    ///@{
 		    /// \brief Checks if a node is reachable from the root(s).
 		    ///
 		    /// Returns \c true if \c v is reachable from the root(s).
 		    /// \pre Either \ref run() or \ref start()
 		    /// must be called before using this function.
 		    bool reached(Node v) { return (*_reached)[v]; }
 		    ///@}
 		  };
 		} //END OF NAMESPACE LEMON
 		#endif

lemon/list_graph.h

Show inline comments

 		/* -*- mode: C++; indent-tabs-mode: nil; -*-
+		 *
 		 * This file is a part of LEMON, a generic C++ optimization library.
+		 *
 		 * Copyright (C) 2003-2008
 		 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
 		 * (Egervary Research Group on Combinatorial Optimization, EGRES).
+		 *
 		 * Permission to use, modify and distribute this software is granted
 		 * provided that this copyright notice appears in all copies. For
 		 * precise terms see the accompanying LICENSE file.
+		 *
 		 * This software is provided "AS IS" with no warranty of any kind,
 		 * express or implied, and with no claim as to its suitability for any
 		 * purpose.
+		 *
 		 */
 		#ifndef LEMON_LIST_GRAPH_H
 		#define LEMON_LIST_GRAPH_H
 		///\ingroup graphs
 		///\file
 		///\brief ListDigraph, ListGraph classes.
 		#include <lemon/core.h>
 		#include <lemon/error.h>
 		#include <lemon/bits/graph_extender.h>
 		#include <vector>
 		#include <list>
 		namespace lemon {
 		  class ListDigraphBase {
 		  protected:
 		    struct NodeT {
 		      int first_in, first_out;
 		      int prev, next;
 		    };
 		    struct ArcT {
 		      int target, source;
 		      int prev_in, prev_out;
 		      int next_in, next_out;
 		    };
 		    std::vector<NodeT> nodes;
 		    int first_node;
 		    int first_free_node;
 		    std::vector<ArcT> arcs;
 		    int first_free_arc;
 		  public:
 		    typedef ListDigraphBase Digraph;
 		    class Node {
 		      friend class ListDigraphBase;
 		    protected:
 		      int id;
 		      explicit Node(int pid) { id = pid;}
 		    public:
 		      Node() {}
 		      Node (Invalid) { id = -1; }
 		      bool operator==(const Node& node) const {return id == node.id;}
 		      bool operator!=(const Node& node) const {return id != node.id;}
 		      bool operator<(const Node& node) const {return id < node.id;}
 		    };
 		    class Arc {
 		      friend class ListDigraphBase;
 		    protected:
 		      int id;
 		      explicit Arc(int pid) { id = pid;}
 		    public:
 		      Arc() {}
 		      Arc (Invalid) { id = -1; }
 		      bool operator==(const Arc& arc) const {return id == arc.id;}
 		      bool operator!=(const Arc& arc) const {return id != arc.id;}
 		      bool operator<(const Arc& arc) const {return id < arc.id;}
 		    };
 		    ListDigraphBase()
 		      : nodes(), first_node(-1),
 		        first_free_node(-1), arcs(), first_free_arc(-1) {}
 		    int maxNodeId() const { return nodes.size()-1; }
 		    int maxArcId() const { return arcs.size()-1; }
 		    Node source(Arc e) const { return Node(arcs[e.id].source); }
 		    Node target(Arc e) const { return Node(arcs[e.id].target); }
 		    void first(Node& node) const {
 		      node.id = first_node;
+		    }
 		    void next(Node& node) const {
 		      node.id = nodes[node.id].next;
+		    }
 		    void first(Arc& arc) const {
 		      int n;
 		      for(n = first_node;
 		          n!=-1 && nodes[n].first_in == -1;
 		          n = nodes[n].next) {}
 		      arc.id = (n == -1) ? -1 : nodes[n].first_in;
+		    }
 		    void next(Arc& arc) const {
 		      if (arcs[arc.id].next_in != -1) {
 		        arc.id = arcs[arc.id].next_in;
 		      } else {
 		        int n;
 		        for(n = nodes[arcs[arc.id].target].next;
 		            n!=-1 && nodes[n].first_in == -1;
 		            n = nodes[n].next) {}
 		        arc.id = (n == -1) ? -1 : nodes[n].first_in;
+		      }
+		    }
 		    void firstOut(Arc &e, const Node& v) const {
 		      e.id = nodes[v.id].first_out;
+		    }
 		    void nextOut(Arc &e) const {
 		      e.id=arcs[e.id].next_out;
+		    }
 		    void firstIn(Arc &e, const Node& v) const {
 		      e.id = nodes[v.id].first_in;
+		    }
 		    void nextIn(Arc &e) const {
 		      e.id=arcs[e.id].next_in;
+		    }
 		    static int id(Node v) { return v.id; }
 		    static int id(Arc e) { return e.id; }
 		    static Node nodeFromId(int id) { return Node(id);}
 		    static Arc arcFromId(int id) { return Arc(id);}
 		    bool valid(Node n) const {
 		      return n.id >= 0 && n.id < static_cast<int>(nodes.size()) &&
 		        nodes[n.id].prev != -2;
+		    }
 		    bool valid(Arc a) const {
 		      return a.id >= 0 && a.id < static_cast<int>(arcs.size()) &&
 		        arcs[a.id].prev_in != -2;
+		    }
 		    Node addNode() {
 		      int n;
 		      if(first_free_node==-1) {
 		        n = nodes.size();
 		        nodes.push_back(NodeT());
 		      } else {
 		        n = first_free_node;
 		        first_free_node = nodes[n].next;
+		      }
 		      nodes[n].next = first_node;
 		      if(first_node != -1) nodes[first_node].prev = n;
 		      first_node = n;
 		      nodes[n].prev = -1;
 		      nodes[n].first_in = nodes[n].first_out = -1;
 		      return Node(n);
+		    }
 		    Arc addArc(Node u, Node v) {
 		      int n;
 		      if (first_free_arc == -1) {
 		        n = arcs.size();
 		        arcs.push_back(ArcT());
 		      } else {
 		        n = first_free_arc;
 		        first_free_arc = arcs[n].next_in;
+		      }
 		      arcs[n].source = u.id;
 		      arcs[n].target = v.id;
 		      arcs[n].next_out = nodes[u.id].first_out;
 		      if(nodes[u.id].first_out != -1) {
 		        arcs[nodes[u.id].first_out].prev_out = n;
+		      }
 		      arcs[n].next_in = nodes[v.id].first_in;
 		      if(nodes[v.id].first_in != -1) {
 		        arcs[nodes[v.id].first_in].prev_in = n;
+		      }
 		      arcs[n].prev_in = arcs[n].prev_out = -1;
 		      nodes[u.id].first_out = nodes[v.id].first_in = n;
 		      return Arc(n);
+		    }
 		    void erase(const Node& node) {
 		      int n = node.id;
 		      if(nodes[n].next != -1) {
 		        nodes[nodes[n].next].prev = nodes[n].prev;
+		      }
 		      if(nodes[n].prev != -1) {
 		        nodes[nodes[n].prev].next = nodes[n].next;
 		      } else {
 		        first_node = nodes[n].next;
+		      }
 		      nodes[n].next = first_free_node;
 		      first_free_node = n;
 		      nodes[n].prev = -2;
+		    }
 		    void erase(const Arc& arc) {
 		      int n = arc.id;
 		      if(arcs[n].next_in!=-1) {
 		        arcs[arcs[n].next_in].prev_in = arcs[n].prev_in;
+		      }
 		      if(arcs[n].prev_in!=-1) {
 		        arcs[arcs[n].prev_in].next_in = arcs[n].next_in;
 		      } else {
 		        nodes[arcs[n].target].first_in = arcs[n].next_in;
+		      }
 		      if(arcs[n].next_out!=-1) {
 		        arcs[arcs[n].next_out].prev_out = arcs[n].prev_out;
+		      }
 		      if(arcs[n].prev_out!=-1) {
 		        arcs[arcs[n].prev_out].next_out = arcs[n].next_out;
 		      } else {
 		        nodes[arcs[n].source].first_out = arcs[n].next_out;
+		      }
 		      arcs[n].next_in = first_free_arc;
 		      first_free_arc = n;
 		      arcs[n].prev_in = -2;
+		    }
 		    void clear() {
 		      arcs.clear();
 		      nodes.clear();
 		      first_node = first_free_node = first_free_arc = -1;
+		    }
 		  protected:
 		    void changeTarget(Arc e, Node n)
+		    {
 		      if(arcs[e.id].next_in != -1)
 		        arcs[arcs[e.id].next_in].prev_in = arcs[e.id].prev_in;
 		      if(arcs[e.id].prev_in != -1)
 		        arcs[arcs[e.id].prev_in].next_in = arcs[e.id].next_in;
 		      else nodes[arcs[e.id].target].first_in = arcs[e.id].next_in;
 		      if (nodes[n.id].first_in != -1) {
 		        arcs[nodes[n.id].first_in].prev_in = e.id;
+		      }
 		      arcs[e.id].target = n.id;
 		      arcs[e.id].prev_in = -1;
 		      arcs[e.id].next_in = nodes[n.id].first_in;
 		      nodes[n.id].first_in = e.id;
+		    }
 		    void changeSource(Arc e, Node n)
+		    {
 		      if(arcs[e.id].next_out != -1)
 		        arcs[arcs[e.id].next_out].prev_out = arcs[e.id].prev_out;
 		      if(arcs[e.id].prev_out != -1)
 		        arcs[arcs[e.id].prev_out].next_out = arcs[e.id].next_out;
 		      else nodes[arcs[e.id].source].first_out = arcs[e.id].next_out;
 		      if (nodes[n.id].first_out != -1) {
 		        arcs[nodes[n.id].first_out].prev_out = e.id;
+		      }
 		      arcs[e.id].source = n.id;
 		      arcs[e.id].prev_out = -1;
 		      arcs[e.id].next_out = nodes[n.id].first_out;
 		      nodes[n.id].first_out = e.id;
+		    }
 		  };
 		  typedef DigraphExtender<ListDigraphBase> ExtendedListDigraphBase;
 		  /// \addtogroup graphs
 		  /// @{
 		  ///A general directed graph structure.
 		  ///\ref ListDigraph is a simple and fast <em>directed graph</em>
 		  ///implementation based on static linked lists that are stored in
 		  ///\c std::vector structures.
 		  ///
 		  ///It conforms to the \ref concepts::Digraph "Digraph concept" and it
 		  ///also provides several useful additional functionalities.
 		  ///Most of the member functions and nested classes are documented
 		  ///only in the concept class.
 		  ///
 		  ///An important extra feature of this digraph implementation is that
 		  ///its maps are real \ref concepts::ReferenceMap "reference map"s.
 		  ///
 		  ///\sa concepts::Digraph
 		  class ListDigraph : public ExtendedListDigraphBase {
 		  private:
 		    ///ListDigraph is \e not copy constructible. Use copyDigraph() instead.
 		    ///ListDigraph is \e not copy constructible. Use copyDigraph() instead.
 		    ///
 		    ListDigraph(const ListDigraph &) :ExtendedListDigraphBase() {};
 		    ///\brief Assignment of ListDigraph to another one is \e not allowed.
 		    ///Use copyDigraph() instead.
 		    ///Assignment of ListDigraph to another one is \e not allowed.
 		    ///Use copyDigraph() instead.
 		    void operator=(const ListDigraph &) {}
 		  public:
 		    typedef ExtendedListDigraphBase Parent;
 		    /// Constructor
 		    /// Constructor.
 		    ///
 		    ListDigraph() {}
 		    ///Add a new node to the digraph.
 		    ///Add a new node to the digraph.
 		    ///\return the new node.
 		    Node addNode() { return Parent::addNode(); }
 		    ///Add a new arc to the digraph.
 		    ///Add a new arc to the digraph with source node \c s
 		    ///and target node \c t.
 		    ///\return the new arc.
 		    Arc addArc(const Node& s, const Node& t) {
 		      return Parent::addArc(s, t);
+		    }
 		    ///\brief Erase a node from the digraph.
 		    ///
 		    ///Erase a node from the digraph.
 		    ///
 		    void erase(const Node& n) { Parent::erase(n); }
 		    ///\brief Erase an arc from the digraph.
 		    ///
 		    ///Erase an arc from the digraph.
 		    ///
 		    void erase(const Arc& a) { Parent::erase(a); }
 		    /// Node validity check
 		    /// This function gives back true if the given node is valid,
 		    /// ie. it is a real node of the graph.
 		    ///
 		    /// \warning A Node pointing to a removed item
 		    /// could become valid again later if new nodes are
 		    /// added to the graph.
 		    bool valid(Node n) const { return Parent::valid(n); }
 		    /// Arc validity check
 		    /// This function gives back true if the given arc is valid,
 		    /// ie. it is a real arc of the graph.
 		    ///
 		    /// \warning An Arc pointing to a removed item
 		    /// could become valid again later if new nodes are
 		    /// added to the graph.
 		    bool valid(Arc a) const { return Parent::valid(a); }
 		    /// Change the target of \c a to \c n
 		    /// Change the target of \c a to \c n
 		    ///
 		    ///\note The <tt>ArcIt</tt>s and <tt>OutArcIt</tt>s referencing
 		    ///the changed arc remain valid. However <tt>InArcIt</tt>s are
 		    ///invalidated.
 		    ///
 		    ///\warning This functionality cannot be used together with the Snapshot
 		    ///feature.
 		    void changeTarget(Arc a, Node n) {
 		      Parent::changeTarget(a,n);
+		    }
 		    /// Change the source of \c a to \c n
 		    /// Change the source of \c a to \c n
 		    ///
 		    ///\note The <tt>InArcIt</tt>s referencing the changed arc remain
 		    ///valid. However the <tt>ArcIt</tt>s and <tt>OutArcIt</tt>s are
 		    ///invalidated.
 		    ///
 		    ///\warning This functionality cannot be used together with the Snapshot
 		    ///feature.
 		    void changeSource(Arc a, Node n) {
 		      Parent::changeSource(a,n);
+		    }
 		    /// Invert the direction of an arc.
 		    ///\note The <tt>ArcIt</tt>s referencing the changed arc remain
 		    ///valid. However <tt>OutArcIt</tt>s and <tt>InArcIt</tt>s are
 		    ///invalidated.
 		    ///
 		    ///\warning This functionality cannot be used together with the Snapshot
 		    ///feature.
 		    void reverseArc(Arc e) {
 		      Node t=target(e);
 		      changeTarget(e,source(e));
 		      changeSource(e,t);
+		    }
 		    /// Reserve memory for nodes.
 		    /// Using this function it is possible to avoid the superfluous memory
 		    /// allocation: if you know that the digraph you want to build will
 		    /// be very large (e.g. it will contain millions of nodes and/or arcs)
 		    /// then it is worth reserving space for this amount before starting
 		    /// to build the digraph.
 		    /// \sa reserveArc
 		    void reserveNode(int n) { nodes.reserve(n); };
 		    /// Reserve memory for arcs.
 		    /// Using this function it is possible to avoid the superfluous memory
 		    /// allocation: if you know that the digraph you want to build will
 		    /// be very large (e.g. it will contain millions of nodes and/or arcs)
 		    /// then it is worth reserving space for this amount before starting
 		    /// to build the digraph.
 		    /// \sa reserveNode
 		    void reserveArc(int m) { arcs.reserve(m); };
 		    ///Contract two nodes.
 		    ///This function contracts two nodes.
 		    ///Node \p b will be removed but instead of deleting
 		    ///incident arcs, they will be joined to \p a.
 		    ///The last parameter \p r controls whether to remove loops. \c true
 		    ///means that loops will be removed.
 		    ///
 		    ///\note The <tt>ArcIt</tt>s referencing a moved arc remain
 		    ///valid. However <tt>InArcIt</tt>s and <tt>OutArcIt</tt>s
 		    ///may be invalidated.
 		    ///
 		    ///\warning This functionality cannot be used together with the Snapshot
 		    ///feature.
 		    void contract(Node a, Node b, bool r = true)
+		    {
 		      for(OutArcIt e(*this,b);e!=INVALID;) {
 		        OutArcIt f=e;
 		        ++f;
 		        if(r && target(e)==a) erase(e);
 		        else changeSource(e,a);
 		        e=f;
+		      }
 		      for(InArcIt e(*this,b);e!=INVALID;) {
 		        InArcIt f=e;
 		        ++f;
 		        if(r && source(e)==a) erase(e);
 		        else changeTarget(e,a);
 		        e=f;
+		      }
 		      erase(b);
+		    }
 		    ///Split a node.
 		    ///This function splits a node. First a new node is added to the digraph,
 		    ///then the source of each outgoing arc of \c n is moved to this new node.
 		    ///If \c connect is \c true (this is the default value), then a new arc
 		    ///from \c n to the newly created node is also added.
 		    ///\return The newly created node.
 		    ///
 		    ///\note The <tt>ArcIt</tt>s referencing a moved arc remain
 		    ///valid. However <tt>InArcIt</tt>s and <tt>OutArcIt</tt>s may
 		    ///be invalidated.
 		    ///
 		    ///\warning This functionality cannot be used in conjunction with the
 		    ///Snapshot feature.
 		    Node split(Node n, bool connect = true) {
 		      Node b = addNode();
 		      for(OutArcIt e(*this,n);e!=INVALID;) {
 		        OutArcIt f=e;
 		        ++f;
 		        changeSource(e,b);
 		        e=f;
+		      }
 		      if (connect) addArc(n,b);
 		      return b;
+		    }
 		    ///Split an arc.
 		    ///This function splits an arc. First a new node \c b is added to
 		    ///the digraph, then the original arc is re-targeted to \c
 		    ///b. Finally an arc from \c b to the original target is added.
 		    ///
 		    ///\return The newly created node.
 		    ///
 		    ///\warning This functionality cannot be used together with the
 		    ///Snapshot feature.
 		    Node split(Arc e) {
 		      Node b = addNode();
 		      addArc(b,target(e));
 		      changeTarget(e,b);
 		      return b;
+		    }
 		    /// \brief Class to make a snapshot of the digraph and restore
 		    /// it later.
 		    ///
 		    /// Class to make a snapshot of the digraph and restore it later.
 		    ///
 		    /// The newly added nodes and arcs can be removed using the
 		    /// restore() function.
 		    ///
 		    /// \warning Arc and node deletions and other modifications (e.g.
 		    /// contracting, splitting, reversing arcs or nodes) cannot be
 		    /// restored. These events invalidate the snapshot.
 		    class Snapshot {
 		    protected:
 		      typedef Parent::NodeNotifier NodeNotifier;
 		      class NodeObserverProxy : public NodeNotifier::ObserverBase {
 		      public:
 		        NodeObserverProxy(Snapshot& _snapshot)
 		          : snapshot(_snapshot) {}
 		        using NodeNotifier::ObserverBase::attach;
 		        using NodeNotifier::ObserverBase::detach;
 		        using NodeNotifier::ObserverBase::attached;
 		      protected:
 		        virtual void add(const Node& node) {
 		          snapshot.addNode(node);
+		        }
 		        virtual void add(const std::vector<Node>& nodes) {
 		          for (int i = nodes.size() - 1; i >= 0; ++i) {
 		            snapshot.addNode(nodes[i]);
+		          }
+		        }
 		        virtual void erase(const Node& node) {
 		          snapshot.eraseNode(node);
+		        }
 		        virtual void erase(const std::vector<Node>& nodes) {
 		          for (int i = 0; i < int(nodes.size()); ++i) {
 		            snapshot.eraseNode(nodes[i]);
+		          }
+		        }
 		        virtual void build() {
 		          Node node;
 		          std::vector<Node> nodes;
 		          for (notifier()->first(node); node != INVALID;
 		               notifier()->next(node)) {
 		            nodes.push_back(node);
+		          }
 		          for (int i = nodes.size() - 1; i >= 0; --i) {
 		            snapshot.addNode(nodes[i]);
+		          }
+		        }
 		        virtual void clear() {
 		          Node node;
 		          for (notifier()->first(node); node != INVALID;
 		               notifier()->next(node)) {
 		            snapshot.eraseNode(node);
+		          }
+		        }
 		        Snapshot& snapshot;
 		      };
 		      class ArcObserverProxy : public ArcNotifier::ObserverBase {
 		      public:
 		        ArcObserverProxy(Snapshot& _snapshot)
 		          : snapshot(_snapshot) {}
 		        using ArcNotifier::ObserverBase::attach;
 		        using ArcNotifier::ObserverBase::detach;
 		        using ArcNotifier::ObserverBase::attached;
 		      protected:
 		        virtual void add(const Arc& arc) {
 		          snapshot.addArc(arc);
+		        }
 		        virtual void add(const std::vector<Arc>& arcs) {
 		          for (int i = arcs.size() - 1; i >= 0; ++i) {
 		            snapshot.addArc(arcs[i]);
+		          }
+		        }
 		        virtual void erase(const Arc& arc) {
 		          snapshot.eraseArc(arc);
+		        }
 		        virtual void erase(const std::vector<Arc>& arcs) {
 		          for (int i = 0; i < int(arcs.size()); ++i) {
 		            snapshot.eraseArc(arcs[i]);
+		          }
+		        }
 		        virtual void build() {
 		          Arc arc;
 		          std::vector<Arc> arcs;
 		          for (notifier()->first(arc); arc != INVALID;
 		               notifier()->next(arc)) {
 		            arcs.push_back(arc);
+		          }
 		          for (int i = arcs.size() - 1; i >= 0; --i) {
 		            snapshot.addArc(arcs[i]);
+		          }
+		        }
 		        virtual void clear() {
 		          Arc arc;
 		          for (notifier()->first(arc); arc != INVALID;
 		               notifier()->next(arc)) {
 		            snapshot.eraseArc(arc);
+		          }
+		        }
 		        Snapshot& snapshot;
 		      };
 		      ListDigraph *digraph;
 		      NodeObserverProxy node_observer_proxy;
 		      ArcObserverProxy arc_observer_proxy;
 		      std::list<Node> added_nodes;
 		      std::list<Arc> added_arcs;
 		      void addNode(const Node& node) {
 		        added_nodes.push_front(node);
+		      }
 		      void eraseNode(const Node& node) {
 		        std::list<Node>::iterator it =
 		          std::find(added_nodes.begin(), added_nodes.end(), node);
 		        if (it == added_nodes.end()) {
 		          clear();
 		          arc_observer_proxy.detach();
 		          throw NodeNotifier::ImmediateDetach();
 		        } else {
 		          added_nodes.erase(it);
+		        }
+		      }
 		      void addArc(const Arc& arc) {
 		        added_arcs.push_front(arc);
+		      }
 		      void eraseArc(const Arc& arc) {
 		        std::list<Arc>::iterator it =
 		          std::find(added_arcs.begin(), added_arcs.end(), arc);
 		        if (it == added_arcs.end()) {
 		          clear();
 		          node_observer_proxy.detach();
 		          throw ArcNotifier::ImmediateDetach();
 		        } else {
 		          added_arcs.erase(it);
+		        }
+		      }
 		      void attach(ListDigraph &_digraph) {
 		        digraph = &_digraph;
 		        node_observer_proxy.attach(digraph->notifier(Node()));
 		        arc_observer_proxy.attach(digraph->notifier(Arc()));
+		      }
 		      void detach() {
 		        node_observer_proxy.detach();
 		        arc_observer_proxy.detach();
+		      }
 		      bool attached() const {
 		        return node_observer_proxy.attached();
+		      }
 		      void clear() {
 		        added_nodes.clear();
 		        added_arcs.clear();
+		      }
 		    public:
 		      /// \brief Default constructor.
 		      ///
 		      /// Default constructor.
 		      /// To actually make a snapshot you must call save().
 		      Snapshot()
 		        : digraph(0), node_observer_proxy(*this),
 		          arc_observer_proxy(*this) {}
 		      /// \brief Constructor that immediately makes a snapshot.
 		      ///
 		      /// This constructor immediately makes a snapshot of the digraph.
 		      /// \param _digraph The digraph we make a snapshot of.
 		      Snapshot(ListDigraph &_digraph)
 		        : node_observer_proxy(*this),
 		          arc_observer_proxy(*this) {
 		        attach(_digraph);
+		      }
 		      /// \brief Make a snapshot.
 		      ///
 		      /// Make a snapshot of the digraph.
 		      ///
 		      /// This function can be called more than once. In case of a repeated
 		      /// call, the previous snapshot gets lost.
 		      /// \param _digraph The digraph we make the snapshot of.
 		      void save(ListDigraph &_digraph) {
 		        if (attached()) {
 		          detach();
 		          clear();
+		        }
 		        attach(_digraph);
+		      }
 		      /// \brief Undo the changes until the last snapshot.
 		      //
 		      /// Undo the changes until the last snapshot created by save().
 		      void restore() {
 		        detach();
 		        for(std::list<Arc>::iterator it = added_arcs.begin();
 		            it != added_arcs.end(); ++it) {
 		          digraph->erase(*it);
+		        }
 		        for(std::list<Node>::iterator it = added_nodes.begin();
 		            it != added_nodes.end(); ++it) {
 		          digraph->erase(*it);
+		        }
 		        clear();
+		      }
 		      /// \brief Gives back true when the snapshot is valid.
 		      ///
 		      /// Gives back true when the snapshot is valid.
 		      bool valid() const {
 		        return attached();
+		      }
 		    };
 		  };
 		  ///@}
 		  class ListGraphBase {
 		  protected:
 		    struct NodeT {
 		      int first_out;
 		      int prev, next;
 		    };
 		    struct ArcT {
 		      int target;
 		      int prev_out, next_out;
 		    };
 		    std::vector<NodeT> nodes;
 		    int first_node;
 		    int first_free_node;
 		    std::vector<ArcT> arcs;
 		    int first_free_arc;
 		  public:
 		    typedef ListGraphBase Digraph;
 		    class Node;
 		    class Arc;
 		    class Edge;
 		    class Node {
 		      friend class ListGraphBase;
 		    protected:
 		      int id;
 		      explicit Node(int pid) { id = pid;}
 		    public:
 		      Node() {}
 		      Node (Invalid) { id = -1; }
 		      bool operator==(const Node& node) const {return id == node.id;}
 		      bool operator!=(const Node& node) const {return id != node.id;}
 		      bool operator<(const Node& node) const {return id < node.id;}
 		    };
 		    class Edge {
 		      friend class ListGraphBase;
 		    protected:
 		      int id;
 		      explicit Edge(int pid) { id = pid;}
 		    public:
 		      Edge() {}
 		      Edge (Invalid) { id = -1; }
 		      bool operator==(const Edge& edge) const {return id == edge.id;}
 		      bool operator!=(const Edge& edge) const {return id != edge.id;}
 		      bool operator<(const Edge& edge) const {return id < edge.id;}
 		    };
 		    class Arc {
 		      friend class ListGraphBase;
 		    protected:
 		      int id;
 		      explicit Arc(int pid) { id = pid;}
 		    public:
 		      operator Edge() const {
 		        return id != -1 ? edgeFromId(id / 2) : INVALID;
 		      operator Edge() const {
 		        return id != -1 ? edgeFromId(id / 2) : INVALID;
+		      }
 		      Arc() {}
 		      Arc (Invalid) { id = -1; }
 		      bool operator==(const Arc& arc) const {return id == arc.id;}
 		      bool operator!=(const Arc& arc) const {return id != arc.id;}
 		      bool operator<(const Arc& arc) const {return id < arc.id;}
 		    };
 		    ListGraphBase()
 		      : nodes(), first_node(-1),
 		        first_free_node(-1), arcs(), first_free_arc(-1) {}
 		    int maxNodeId() const { return nodes.size()-1; }
 		    int maxEdgeId() const { return arcs.size() / 2 - 1; }
 		    int maxArcId() const { return arcs.size()-1; }
 		    Node source(Arc e) const { return Node(arcs[e.id ^ 1].target); }
 		    Node target(Arc e) const { return Node(arcs[e.id].target); }
 		    Node u(Edge e) const { return Node(arcs[2 * e.id].target); }
 		    Node v(Edge e) const { return Node(arcs[2 * e.id + 1].target); }
 		    static bool direction(Arc e) {
 		      return (e.id & 1) == 1;
+		    }
 		    static Arc direct(Edge e, bool d) {
 		      return Arc(e.id * 2 + (d ? 1 : 0));
+		    }
 		    void first(Node& node) const {
 		      node.id = first_node;
+		    }
 		    void next(Node& node) const {
 		      node.id = nodes[node.id].next;
+		    }
 		    void first(Arc& e) const {
 		      int n = first_node;
 		      while (n != -1 && nodes[n].first_out == -1) {
 		        n = nodes[n].next;
+		      }
 		      e.id = (n == -1) ? -1 : nodes[n].first_out;
+		    }
 		    void next(Arc& e) const {
 		      if (arcs[e.id].next_out != -1) {
 		        e.id = arcs[e.id].next_out;
 		      } else {
 		        int n = nodes[arcs[e.id ^ 1].target].next;
 		        while(n != -1 && nodes[n].first_out == -1) {
 		          n = nodes[n].next;
+		        }
 		        e.id = (n == -1) ? -1 : nodes[n].first_out;
+		      }
+		    }
 		    void first(Edge& e) const {
 		      int n = first_node;
 		      while (n != -1) {
 		        e.id = nodes[n].first_out;
 		        while ((e.id & 1) != 1) {
 		          e.id = arcs[e.id].next_out;
+		        }
 		        if (e.id != -1) {
 		          e.id /= 2;
 		          return;
+		        }
 		        n = nodes[n].next;
+		      }
 		      e.id = -1;
+		    }
 		    void next(Edge& e) const {
 		      int n = arcs[e.id * 2].target;
 		      e.id = arcs[(e.id * 2) | 1].next_out;
 		      while ((e.id & 1) != 1) {
 		        e.id = arcs[e.id].next_out;
+		      }
 		      if (e.id != -1) {
 		        e.id /= 2;
 		        return;
+		      }
 		      n = nodes[n].next;
 		      while (n != -1) {
 		        e.id = nodes[n].first_out;
 		        while ((e.id & 1) != 1) {
 		          e.id = arcs[e.id].next_out;
+		        }
 		        if (e.id != -1) {
 		          e.id /= 2;
 		          return;
+		        }
 		        n = nodes[n].next;
+		      }
 		      e.id = -1;
+		    }
 		    void firstOut(Arc &e, const Node& v) const {
 		      e.id = nodes[v.id].first_out;
+		    }
 		    void nextOut(Arc &e) const {
 		      e.id = arcs[e.id].next_out;
+		    }
 		    void firstIn(Arc &e, const Node& v) const {
 		      e.id = ((nodes[v.id].first_out) ^ 1);
 		      if (e.id == -2) e.id = -1;
+		    }
 		    void nextIn(Arc &e) const {
 		      e.id = ((arcs[e.id ^ 1].next_out) ^ 1);
 		      if (e.id == -2) e.id = -1;
+		    }
 		    void firstInc(Edge &e, bool& d, const Node& v) const {
 		      int a = nodes[v.id].first_out;
 		      if (a != -1 ) {
 		        e.id = a / 2;
 		        d = ((a & 1) == 1);
 		      } else {
 		        e.id = -1;
 		        d = true;
+		      }
+		    }
 		    void nextInc(Edge &e, bool& d) const {
 		      int a = (arcs[(e.id * 2) | (d ? 1 : 0)].next_out);
 		      if (a != -1 ) {
 		        e.id = a / 2;
 		        d = ((a & 1) == 1);
 		      } else {
 		        e.id = -1;
 		        d = true;
+		      }
+		    }
 		    static int id(Node v) { return v.id; }
 		    static int id(Arc e) { return e.id; }
 		    static int id(Edge e) { return e.id; }
 		    static Node nodeFromId(int id) { return Node(id);}
 		    static Arc arcFromId(int id) { return Arc(id);}
 		    static Edge edgeFromId(int id) { return Edge(id);}
 		    bool valid(Node n) const {
 		      return n.id >= 0 && n.id < static_cast<int>(nodes.size()) &&
 		        nodes[n.id].prev != -2;
+		    }
 		    bool valid(Arc a) const {
 		      return a.id >= 0 && a.id < static_cast<int>(arcs.size()) &&
 		        arcs[a.id].prev_out != -2;
+		    }
 		    bool valid(Edge e) const {
 		      return e.id >= 0 && 2 * e.id < static_cast<int>(arcs.size()) &&
 		        arcs[2 * e.id].prev_out != -2;
+		    }
 		    Node addNode() {
 		      int n;
 		      if(first_free_node==-1) {
 		        n = nodes.size();
 		        nodes.push_back(NodeT());
 		      } else {
 		        n = first_free_node;
 		        first_free_node = nodes[n].next;
+		      }
 		      nodes[n].next = first_node;
 		      if (first_node != -1) nodes[first_node].prev = n;
 		      first_node = n;
 		      nodes[n].prev = -1;
 		      nodes[n].first_out = -1;
 		      return Node(n);
+		    }
 		    Edge addEdge(Node u, Node v) {
 		      int n;
 		      if (first_free_arc == -1) {
 		        n = arcs.size();
 		        arcs.push_back(ArcT());
 		        arcs.push_back(ArcT());
 		      } else {
 		        n = first_free_arc;
 		        first_free_arc = arcs[n].next_out;
+		      }
 		      arcs[n].target = u.id;
 		      arcs[n | 1].target = v.id;
 		      arcs[n].next_out = nodes[v.id].first_out;
 		      if (nodes[v.id].first_out != -1) {
 		        arcs[nodes[v.id].first_out].prev_out = n;
+		      }
 		      arcs[n].prev_out = -1;
 		      nodes[v.id].first_out = n;
 		      arcs[n | 1].next_out = nodes[u.id].first_out;
 		      if (nodes[u.id].first_out != -1) {
 		        arcs[nodes[u.id].first_out].prev_out = (n | 1);
+		      }
 		      arcs[n | 1].prev_out = -1;
 		      nodes[u.id].first_out = (n | 1);
 		      return Edge(n / 2);
+		    }
 		    void erase(const Node& node) {
 		      int n = node.id;
 		      if(nodes[n].next != -1) {
 		        nodes[nodes[n].next].prev = nodes[n].prev;
+		      }
 		      if(nodes[n].prev != -1) {
 		        nodes[nodes[n].prev].next = nodes[n].next;
 		      } else {
 		        first_node = nodes[n].next;
+		      }
 		      nodes[n].next = first_free_node;
 		      first_free_node = n;
 		      nodes[n].prev = -2;
+		    }
 		    void erase(const Edge& edge) {
 		      int n = edge.id * 2;
 		      if (arcs[n].next_out != -1) {
 		        arcs[arcs[n].next_out].prev_out = arcs[n].prev_out;
+		      }
 		      if (arcs[n].prev_out != -1) {
 		        arcs[arcs[n].prev_out].next_out = arcs[n].next_out;
 		      } else {
 		        nodes[arcs[n | 1].target].first_out = arcs[n].next_out;
+		      }
 		      if (arcs[n | 1].next_out != -1) {
 		        arcs[arcs[n | 1].next_out].prev_out = arcs[n | 1].prev_out;
+		      }
 		      if (arcs[n | 1].prev_out != -1) {
 		        arcs[arcs[n | 1].prev_out].next_out = arcs[n | 1].next_out;
 		      } else {
 		        nodes[arcs[n].target].first_out = arcs[n | 1].next_out;
+		      }
 		      arcs[n].next_out = first_free_arc;
 		      first_free_arc = n;
 		      arcs[n].prev_out = -2;
 		      arcs[n | 1].prev_out = -2;
+		    }
 		    void clear() {
 		      arcs.clear();
 		      nodes.clear();
 		      first_node = first_free_node = first_free_arc = -1;
+		    }
 		  protected:
 		    void changeV(Edge e, Node n) {
 		      if(arcs[2 * e.id].next_out != -1) {
 		        arcs[arcs[2 * e.id].next_out].prev_out = arcs[2 * e.id].prev_out;
+		      }
 		      if(arcs[2 * e.id].prev_out != -1) {
 		        arcs[arcs[2 * e.id].prev_out].next_out =
 		          arcs[2 * e.id].next_out;
 		      } else {
 		        nodes[arcs[(2 * e.id) | 1].target].first_out =
 		          arcs[2 * e.id].next_out;
+		      }
 		      if (nodes[n.id].first_out != -1) {
 		        arcs[nodes[n.id].first_out].prev_out = 2 * e.id;
+		      }
 		      arcs[(2 * e.id) | 1].target = n.id;
 		      arcs[2 * e.id].prev_out = -1;
 		      arcs[2 * e.id].next_out = nodes[n.id].first_out;
 		      nodes[n.id].first_out = 2 * e.id;
+		    }
 		    void changeU(Edge e, Node n) {
 		      if(arcs[(2 * e.id) | 1].next_out != -1) {
 		        arcs[arcs[(2 * e.id) | 1].next_out].prev_out =
 		          arcs[(2 * e.id) | 1].prev_out;
+		      }
 		      if(arcs[(2 * e.id) | 1].prev_out != -1) {
 		        arcs[arcs[(2 * e.id) | 1].prev_out].next_out =
 		          arcs[(2 * e.id) | 1].next_out;
 		      } else {
 		        nodes[arcs[2 * e.id].target].first_out =
 		          arcs[(2 * e.id) | 1].next_out;
+		      }
 		      if (nodes[n.id].first_out != -1) {
 		        arcs[nodes[n.id].first_out].prev_out = ((2 * e.id) | 1);
+		      }
 		      arcs[2 * e.id].target = n.id;
 		      arcs[(2 * e.id) | 1].prev_out = -1;
 		      arcs[(2 * e.id) | 1].next_out = nodes[n.id].first_out;
 		      nodes[n.id].first_out = ((2 * e.id) | 1);
+		    }
 		  };
 		  typedef GraphExtender<ListGraphBase> ExtendedListGraphBase;
 		  /// \addtogroup graphs
 		  /// @{
 		  ///A general undirected graph structure.
 		  ///\ref ListGraph is a simple and fast <em>undirected graph</em>
 		  ///implementation based on static linked lists that are stored in
 		  ///\c std::vector structures.
 		  ///
 		  ///It conforms to the \ref concepts::Graph "Graph concept" and it
 		  ///also provides several useful additional functionalities.
 		  ///Most of the member functions and nested classes are documented
 		  ///only in the concept class.
 		  ///
 		  ///An important extra feature of this graph implementation is that
 		  ///its maps are real \ref concepts::ReferenceMap "reference map"s.
 		  ///
 		  ///\sa concepts::Graph
 		  class ListGraph : public ExtendedListGraphBase {
 		  private:
 		    ///ListGraph is \e not copy constructible. Use copyGraph() instead.
 		    ///ListGraph is \e not copy constructible. Use copyGraph() instead.
 		    ///
 		    ListGraph(const ListGraph &) :ExtendedListGraphBase()  {};
 		    ///\brief Assignment of ListGraph to another one is \e not allowed.
 		    ///Use copyGraph() instead.
 		    ///Assignment of ListGraph to another one is \e not allowed.
 		    ///Use copyGraph() instead.
 		    void operator=(const ListGraph &) {}
 		  public:
 		    /// Constructor
 		    /// Constructor.
 		    ///
 		    ListGraph() {}
 		    typedef ExtendedListGraphBase Parent;
 		    typedef Parent::OutArcIt IncEdgeIt;
 		    /// \brief Add a new node to the graph.
 		    ///
 		    /// Add a new node to the graph.
 		    /// \return the new node.
 		    Node addNode() { return Parent::addNode(); }
 		    /// \brief Add a new edge to the graph.
 		    ///
 		    /// Add a new edge to the graph with source node \c s
 		    /// and target node \c t.
 		    /// \return the new edge.
 		    Edge addEdge(const Node& s, const Node& t) {
 		      return Parent::addEdge(s, t);
+		    }
 		    /// \brief Erase a node from the graph.
 		    ///
 		    /// Erase a node from the graph.
 		    ///
 		    void erase(const Node& n) { Parent::erase(n); }
 		    /// \brief Erase an edge from the graph.
 		    ///
 		    /// Erase an edge from the graph.
 		    ///
 		    void erase(const Edge& e) { Parent::erase(e); }
 		    /// Node validity check
 		    /// This function gives back true if the given node is valid,
 		    /// ie. it is a real node of the graph.
 		    ///
 		    /// \warning A Node pointing to a removed item
 		    /// could become valid again later if new nodes are
 		    /// added to the graph.
 		    bool valid(Node n) const { return Parent::valid(n); }
 		    /// Arc validity check
 		    /// This function gives back true if the given arc is valid,
 		    /// ie. it is a real arc of the graph.
 		    ///
 		    /// \warning An Arc pointing to a removed item
 		    /// could become valid again later if new edges are
 		    /// added to the graph.
 		    bool valid(Arc a) const { return Parent::valid(a); }
 		    /// Edge validity check
 		    /// This function gives back true if the given edge is valid,
 		    /// ie. it is a real arc of the graph.
 		    ///
 		    /// \warning A Edge pointing to a removed item
 		    /// could become valid again later if new edges are
 		    /// added to the graph.
 		    bool valid(Edge e) const { return Parent::valid(e); }
 		    /// \brief Change the end \c u of \c e to \c n
 		    ///
 		    /// This function changes the end \c u of \c e to node \c n.
 		    ///
 		    ///\note The <tt>EdgeIt</tt>s and <tt>ArcIt</tt>s referencing the
 		    ///changed edge are invalidated and if the changed node is the
 		    ///base node of an iterator then this iterator is also
 		    ///invalidated.
 		    ///
 		    ///\warning This functionality cannot be used together with the
 		    ///Snapshot feature.
 		    void changeU(Edge e, Node n) {
 		      Parent::changeU(e,n);
+		    }
 		    /// \brief Change the end \c v of \c e to \c n
 		    ///
 		    /// This function changes the end \c v of \c e to \c n.
 		    ///
 		    ///\note The <tt>EdgeIt</tt>s referencing the changed edge remain
 		    ///valid, however <tt>ArcIt</tt>s and if the changed node is the
 		    ///base node of an iterator then this iterator is invalidated.
 		    ///
 		    ///\warning This functionality cannot be used together with the
 		    ///Snapshot feature.
 		    void changeV(Edge e, Node n) {
 		      Parent::changeV(e,n);
+		    }
 		    /// \brief Contract two nodes.
 		    ///
 		    /// This function contracts two nodes.
 		    /// Node \p b will be removed but instead of deleting
 		    /// its neighboring arcs, they will be joined to \p a.
 		    /// The last parameter \p r controls whether to remove loops. \c true
 		    /// means that loops will be removed.
 		    ///
 		    /// \note The <tt>ArcIt</tt>s referencing a moved arc remain
 		    /// valid.
 		    ///
 		    ///\warning This functionality cannot be used together with the
 		    ///Snapshot feature.
 		    void contract(Node a, Node b, bool r = true) {
 		      for(IncEdgeIt e(*this, b); e!=INVALID;) {
 		        IncEdgeIt f = e; ++f;
 		        if (r && runningNode(e) == a) {
 		          erase(e);
 		        } else if (u(e) == b) {
 		          changeU(e, a);
 		        } else {
 		          changeV(e, a);
+		        }
 		        e = f;
+		      }
 		      erase(b);
+		    }
 		    /// \brief Class to make a snapshot of the graph and restore
 		    /// it later.
 		    ///
 		    /// Class to make a snapshot of the graph and restore it later.
 		    ///
 		    /// The newly added nodes and edges can be removed
 		    /// using the restore() function.
 		    ///
 		    /// \warning Edge and node deletions and other modifications
 		    /// (e.g. changing nodes of edges, contracting nodes) cannot be
 		    /// restored. These events invalidate the snapshot.
 		    class Snapshot {
 		    protected:
 		      typedef Parent::NodeNotifier NodeNotifier;
 		      class NodeObserverProxy : public NodeNotifier::ObserverBase {
 		      public:
 		        NodeObserverProxy(Snapshot& _snapshot)
 		          : snapshot(_snapshot) {}
 		        using NodeNotifier::ObserverBase::attach;
 		        using NodeNotifier::ObserverBase::detach;
 		        using NodeNotifier::ObserverBase::attached;
 		      protected:
 		        virtual void add(const Node& node) {
 		          snapshot.addNode(node);
+		        }
 		        virtual void add(const std::vector<Node>& nodes) {
 		          for (int i = nodes.size() - 1; i >= 0; ++i) {
 		            snapshot.addNode(nodes[i]);
+		          }
+		        }
 		        virtual void erase(const Node& node) {
 		          snapshot.eraseNode(node);
+		        }
 		        virtual void erase(const std::vector<Node>& nodes) {
 		          for (int i = 0; i < int(nodes.size()); ++i) {
 		            snapshot.eraseNode(nodes[i]);
+		          }
+		        }
 		        virtual void build() {
 		          Node node;
 		          std::vector<Node> nodes;
 		          for (notifier()->first(node); node != INVALID;
 		               notifier()->next(node)) {
 		            nodes.push_back(node);
+		          }
 		          for (int i = nodes.size() - 1; i >= 0; --i) {
 		            snapshot.addNode(nodes[i]);
+		          }
+		        }
 		        virtual void clear() {
 		          Node node;
 		          for (notifier()->first(node); node != INVALID;
 		               notifier()->next(node)) {
 		            snapshot.eraseNode(node);
+		          }
+		        }
 		        Snapshot& snapshot;
 		      };
 		      class EdgeObserverProxy : public EdgeNotifier::ObserverBase {
 		      public:
 		        EdgeObserverProxy(Snapshot& _snapshot)
 		          : snapshot(_snapshot) {}
 		        using EdgeNotifier::ObserverBase::attach;
 		        using EdgeNotifier::ObserverBase::detach;
 		        using EdgeNotifier::ObserverBase::attached;
 		      protected:
 		        virtual void add(const Edge& edge) {
 		          snapshot.addEdge(edge);
+		        }
 		        virtual void add(const std::vector<Edge>& edges) {
 		          for (int i = edges.size() - 1; i >= 0; ++i) {
 		            snapshot.addEdge(edges[i]);
+		          }
+		        }
 		        virtual void erase(const Edge& edge) {
 		          snapshot.eraseEdge(edge);
+		        }
 		        virtual void erase(const std::vector<Edge>& edges) {
 		          for (int i = 0; i < int(edges.size()); ++i) {
 		            snapshot.eraseEdge(edges[i]);
+		          }
+		        }
 		        virtual void build() {
 		          Edge edge;
 		          std::vector<Edge> edges;
 		          for (notifier()->first(edge); edge != INVALID;
 		               notifier()->next(edge)) {
 		            edges.push_back(edge);
+		          }
 		          for (int i = edges.size() - 1; i >= 0; --i) {
 		            snapshot.addEdge(edges[i]);
+		          }
+		        }
 		        virtual void clear() {
 		          Edge edge;
 		          for (notifier()->first(edge); edge != INVALID;
 		               notifier()->next(edge)) {
 		            snapshot.eraseEdge(edge);
+		          }
+		        }
 		        Snapshot& snapshot;
 		      };
 		      ListGraph *graph;
 		      NodeObserverProxy node_observer_proxy;
 		      EdgeObserverProxy edge_observer_proxy;
 		      std::list<Node> added_nodes;
 		      std::list<Edge> added_edges;
 		      void addNode(const Node& node) {
 		        added_nodes.push_front(node);
+		      }
 		      void eraseNode(const Node& node) {
 		        std::list<Node>::iterator it =
 		          std::find(added_nodes.begin(), added_nodes.end(), node);
 		        if (it == added_nodes.end()) {
 		          clear();
 		          edge_observer_proxy.detach();
 		          throw NodeNotifier::ImmediateDetach();
 		        } else {
 		          added_nodes.erase(it);
+		        }
+		      }
 		      void addEdge(const Edge& edge) {
 		        added_edges.push_front(edge);
+		      }
 		      void eraseEdge(const Edge& edge) {
 		        std::list<Edge>::iterator it =
 		          std::find(added_edges.begin(), added_edges.end(), edge);
 		        if (it == added_edges.end()) {
 		          clear();
 		          node_observer_proxy.detach();
 		          throw EdgeNotifier::ImmediateDetach();
 		        } else {
 		          added_edges.erase(it);
+		        }
+		      }
 		      void attach(ListGraph &_graph) {
 		        graph = &_graph;
 		        node_observer_proxy.attach(graph->notifier(Node()));
 		        edge_observer_proxy.attach(graph->notifier(Edge()));
+		      }
 		      void detach() {
 		        node_observer_proxy.detach();
 		        edge_observer_proxy.detach();
+		      }
 		      bool attached() const {
 		        return node_observer_proxy.attached();
+		      }
 		      void clear() {
 		        added_nodes.clear();
 		        added_edges.clear();
+		      }
 		    public:
 		      /// \brief Default constructor.
 		      ///
 		      /// Default constructor.
 		      /// To actually make a snapshot you must call save().
 		      Snapshot()
 		        : graph(0), node_observer_proxy(*this),
 		          edge_observer_proxy(*this) {}
 		      /// \brief Constructor that immediately makes a snapshot.
 		      ///
 		      /// This constructor immediately makes a snapshot of the graph.
 		      /// \param _graph The graph we make a snapshot of.
 		      Snapshot(ListGraph &_graph)
 		        : node_observer_proxy(*this),
 		          edge_observer_proxy(*this) {
 		        attach(_graph);
+		      }
 		      /// \brief Make a snapshot.
 		      ///
 		      /// Make a snapshot of the graph.
 		      ///
 		      /// This function can be called more than once. In case of a repeated
 		      /// call, the previous snapshot gets lost.
 		      /// \param _graph The graph we make the snapshot of.
 		      void save(ListGraph &_graph) {
 		        if (attached()) {
 		          detach();
 		          clear();
+		        }
 		        attach(_graph);
+		      }
 		      /// \brief Undo the changes until the last snapshot.
 		      //
 		      /// Undo the changes until the last snapshot created by save().
 		      void restore() {
 		        detach();
 		        for(std::list<Edge>::iterator it = added_edges.begin();
 		            it != added_edges.end(); ++it) {
 		          graph->erase(*it);
+		        }
 		        for(std::list<Node>::iterator it = added_nodes.begin();
 		            it != added_nodes.end(); ++it) {
 		          graph->erase(*it);
+		        }
 		        clear();
+		      }
 		      /// \brief Gives back true when the snapshot is valid.
 		      ///
 		      /// Gives back true when the snapshot is valid.
 		      bool valid() const {
 		        return attached();
+		      }
 		    };
 		  };
 		  /// @}
 		} //namespace lemon
 		#endif

lemon/smart_graph.h

Show inline comments

 		/* -*- mode: C++; indent-tabs-mode: nil; -*-
+		 *
 		 * This file is a part of LEMON, a generic C++ optimization library.
+		 *
 		 * Copyright (C) 2003-2008
 		 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
 		 * (Egervary Research Group on Combinatorial Optimization, EGRES).
+		 *
 		 * Permission to use, modify and distribute this software is granted
 		 * provided that this copyright notice appears in all copies. For
 		 * precise terms see the accompanying LICENSE file.
+		 *
 		 * This software is provided "AS IS" with no warranty of any kind,
 		 * express or implied, and with no claim as to its suitability for any
 		 * purpose.
+		 *
 		 */
 		#ifndef LEMON_SMART_GRAPH_H
 		#define LEMON_SMART_GRAPH_H
 		///\ingroup graphs
 		///\file
 		///\brief SmartDigraph and SmartGraph classes.
 		#include <vector>
 		#include <lemon/core.h>
 		#include <lemon/error.h>
 		#include <lemon/bits/graph_extender.h>
 		namespace lemon {
 		  class SmartDigraph;
 		  ///Base of SmartDigraph
 		  ///Base of SmartDigraph
 		  ///
 		  class SmartDigraphBase {
 		  protected:
 		    struct NodeT
+		    {
 		      int first_in, first_out;
 		      NodeT() {}
 		    };
 		    struct ArcT
+		    {
 		      int target, source, next_in, next_out;
 		      ArcT() {}
 		    };
 		    std::vector<NodeT> nodes;
 		    std::vector<ArcT> arcs;
 		  public:
 		    typedef SmartDigraphBase Graph;
 		    class Node;
 		    class Arc;
 		  public:
 		    SmartDigraphBase() : nodes(), arcs() { }
 		    SmartDigraphBase(const SmartDigraphBase &_g)
 		      : nodes(_g.nodes), arcs(_g.arcs) { }
 		    typedef True NodeNumTag;
 		    typedef True EdgeNumTag;
 		    int nodeNum() const { return nodes.size(); }
 		    int arcNum() const { return arcs.size(); }
 		    int maxNodeId() const { return nodes.size()-1; }
 		    int maxArcId() const { return arcs.size()-1; }
 		    Node addNode() {
 		      int n = nodes.size();
 		      nodes.push_back(NodeT());
 		      nodes[n].first_in = -1;
 		      nodes[n].first_out = -1;
 		      return Node(n);
+		    }
 		    Arc addArc(Node u, Node v) {
 		      int n = arcs.size();
 		      arcs.push_back(ArcT());
 		      arcs[n].source = u._id;
 		      arcs[n].target = v._id;
 		      arcs[n].next_out = nodes[u._id].first_out;
 		      arcs[n].next_in = nodes[v._id].first_in;
 		      nodes[u._id].first_out = nodes[v._id].first_in = n;
 		      return Arc(n);
+		    }
 		    void clear() {
 		      arcs.clear();
 		      nodes.clear();
+		    }
 		    Node source(Arc a) const { return Node(arcs[a._id].source); }
 		    Node target(Arc a) const { return Node(arcs[a._id].target); }
 		    static int id(Node v) { return v._id; }
 		    static int id(Arc a) { return a._id; }
 		    static Node nodeFromId(int id) { return Node(id);}
 		    static Arc arcFromId(int id) { return Arc(id);}
 		    bool valid(Node n) const {
 		      return n._id >= 0 && n._id < static_cast<int>(nodes.size());
+		    }
 		    bool valid(Arc a) const {
 		      return a._id >= 0 && a._id < static_cast<int>(arcs.size());
+		    }
 		    class Node {
 		      friend class SmartDigraphBase;
 		      friend class SmartDigraph;
 		    protected:
 		      int _id;
 		      explicit Node(int id) : _id(id) {}
 		    public:
 		      Node() {}
 		      Node (Invalid) : _id(-1) {}
 		      bool operator==(const Node i) const {return _id == i._id;}
 		      bool operator!=(const Node i) const {return _id != i._id;}
 		      bool operator<(const Node i) const {return _id < i._id;}
 		    };
 		    class Arc {
 		      friend class SmartDigraphBase;
 		      friend class SmartDigraph;
 		    protected:
 		      int _id;
 		      explicit Arc(int id) : _id(id) {}
 		    public:
 		      Arc() { }
 		      Arc (Invalid) : _id(-1) {}
 		      bool operator==(const Arc i) const {return _id == i._id;}
 		      bool operator!=(const Arc i) const {return _id != i._id;}
 		      bool operator<(const Arc i) const {return _id < i._id;}
 		    };
 		    void first(Node& node) const {
 		      node._id = nodes.size() - 1;
+		    }
 		    static void next(Node& node) {
 		      --node._id;
+		    }
 		    void first(Arc& arc) const {
 		      arc._id = arcs.size() - 1;
+		    }
 		    static void next(Arc& arc) {
 		      --arc._id;
+		    }
 		    void firstOut(Arc& arc, const Node& node) const {
 		      arc._id = nodes[node._id].first_out;
+		    }
 		    void nextOut(Arc& arc) const {
 		      arc._id = arcs[arc._id].next_out;
+		    }
 		    void firstIn(Arc& arc, const Node& node) const {
 		      arc._id = nodes[node._id].first_in;
+		    }
 		    void nextIn(Arc& arc) const {
 		      arc._id = arcs[arc._id].next_in;
+		    }
 		  };
 		  typedef DigraphExtender<SmartDigraphBase> ExtendedSmartDigraphBase;
 		  ///\ingroup graphs
 		  ///
 		  ///\brief A smart directed graph class.
 		  ///
 		  ///This is a simple and fast digraph implementation.
 		  ///It is also quite memory efficient, but at the price
 		  ///that <b> it does support only limited (only stack-like)
 		  ///node and arc deletions</b>.
 		  ///It conforms to the \ref concepts::Digraph "Digraph concept" with
 		  ///an important extra feature that its maps are real \ref
 		  ///concepts::ReferenceMap "reference map"s.
 		  ///
 		  ///\sa concepts::Digraph.
 		  class SmartDigraph : public ExtendedSmartDigraphBase {
 		  public:
 		    typedef ExtendedSmartDigraphBase Parent;
 		  private:
 		    ///SmartDigraph is \e not copy constructible. Use DigraphCopy() instead.
 		    ///SmartDigraph is \e not copy constructible. Use DigraphCopy() instead.
 		    ///
 		    SmartDigraph(const SmartDigraph &) : ExtendedSmartDigraphBase() {};
 		    ///\brief Assignment of SmartDigraph to another one is \e not allowed.
 		    ///Use DigraphCopy() instead.
 		    ///Assignment of SmartDigraph to another one is \e not allowed.
 		    ///Use DigraphCopy() instead.
 		    void operator=(const SmartDigraph &) {}
 		  public:
 		    /// Constructor
 		    /// Constructor.
 		    ///
 		    SmartDigraph() {};
 		    ///Add a new node to the digraph.
 		    /// \return the new node.
 		    ///
 		    Node addNode() { return Parent::addNode(); }
 		    ///Add a new arc to the digraph.
 		    ///Add a new arc to the digraph with source node \c s
 		    ///and target node \c t.
 		    ///\return the new arc.
 		    Arc addArc(const Node& s, const Node& t) {
 		      return Parent::addArc(s, t);
+		    }
 		    /// \brief Using this it is possible to avoid the superfluous memory
 		    /// allocation.
 		    /// Using this it is possible to avoid the superfluous memory
 		    /// allocation: if you know that the digraph you want to build will
 		    /// be very large (e.g. it will contain millions of nodes and/or arcs)
 		    /// then it is worth reserving space for this amount before starting
 		    /// to build the digraph.
 		    /// \sa reserveArc
 		    void reserveNode(int n) { nodes.reserve(n); };
 		    /// \brief Using this it is possible to avoid the superfluous memory
 		    /// allocation.
 		    /// Using this it is possible to avoid the superfluous memory
 		    /// allocation: if you know that the digraph you want to build will
 		    /// be very large (e.g. it will contain millions of nodes and/or arcs)
 		    /// then it is worth reserving space for this amount before starting
 		    /// to build the digraph.
 		    /// \sa reserveNode
 		    void reserveArc(int m) { arcs.reserve(m); };
 		    /// \brief Node validity check
 		    ///
 		    /// This function gives back true if the given node is valid,
 		    /// ie. it is a real node of the graph.
 		    ///
 		    /// \warning A removed node (using Snapshot) could become valid again
 		    /// when new nodes are added to the graph.
 		    bool valid(Node n) const { return Parent::valid(n); }
 		    /// \brief Arc validity check
 		    ///
 		    /// This function gives back true if the given arc is valid,
 		    /// ie. it is a real arc of the graph.
 		    ///
 		    /// \warning A removed arc (using Snapshot) could become valid again
 		    /// when new arcs are added to the graph.
 		    bool valid(Arc a) const { return Parent::valid(a); }
 		    ///Clear the digraph.
 		    ///Erase all the nodes and arcs from the digraph.
 		    ///
 		    void clear() {
 		      Parent::clear();
+		    }
 		    ///Split a node.
 		    ///This function splits a node. First a new node is added to the digraph,
 		    ///then the source of each outgoing arc of \c n is moved to this new node.
 		    ///If \c connect is \c true (this is the default value), then a new arc
 		    ///from \c n to the newly created node is also added.
 		    ///\return The newly created node.
 		    ///
 		    ///\note The <tt>Arc</tt>s
 		    ///referencing a moved arc remain
 		    ///valid. However <tt>InArc</tt>'s and <tt>OutArc</tt>'s
 		    ///may be invalidated.
 		    ///\warning This functionality cannot be used together with the Snapshot
 		    ///feature.
 		    Node split(Node n, bool connect = true)
+		    {
 		      Node b = addNode();
 		      nodes[b._id].first_out=nodes[n._id].first_out;
 		      nodes[n._id].first_out=-1;
 		      for(int i=nodes[b._id].first_out;i!=-1;i++) arcs[i].source=b._id;
 		      if(connect) addArc(n,b);
 		      return b;
+		    }
 		  public:
 		    class Snapshot;
 		  protected:
 		    void restoreSnapshot(const Snapshot &s)
+		    {
 		      while(s.arc_num<arcs.size()) {
 		        Arc arc = arcFromId(arcs.size()-1);
 		        Parent::notifier(Arc()).erase(arc);
 		        nodes[arcs.back().source].first_out=arcs.back().next_out;
 		        nodes[arcs.back().target].first_in=arcs.back().next_in;
 		        arcs.pop_back();
+		      }
 		      while(s.node_num<nodes.size()) {
 		        Node node = nodeFromId(nodes.size()-1);
 		        Parent::notifier(Node()).erase(node);
 		        nodes.pop_back();
+		      }
+		    }
 		  public:
 		    ///Class to make a snapshot of the digraph and to restrore to it later.
 		    ///Class to make a snapshot of the digraph and to restrore to it later.
 		    ///
 		    ///The newly added nodes and arcs can be removed using the
 		    ///restore() function.
 		    ///\note After you restore a state, you cannot restore
 		    ///a later state, in other word you cannot add again the arcs deleted
 		    ///by restore() using another one Snapshot instance.
 		    ///
 		    ///\warning If you do not use correctly the snapshot that can cause
 		    ///either broken program, invalid state of the digraph, valid but
 		    ///not the restored digraph or no change. Because the runtime performance
 		    ///the validity of the snapshot is not stored.
 		    class Snapshot
+		    {
 		      SmartDigraph *_graph;
 		    protected:
 		      friend class SmartDigraph;
 		      unsigned int node_num;
 		      unsigned int arc_num;
 		    public:
 		      ///Default constructor.
 		      ///Default constructor.
 		      ///To actually make a snapshot you must call save().
 		      ///
 		      Snapshot() : _graph(0) {}
 		      ///Constructor that immediately makes a snapshot
 		      ///This constructor immediately makes a snapshot of the digraph.
 		      ///\param graph The digraph we make a snapshot of.
 		      Snapshot(SmartDigraph &graph) : _graph(&graph) {
 		        node_num=_graph->nodes.size();
 		        arc_num=_graph->arcs.size();
+		      }
 		      ///Make a snapshot.
 		      ///Make a snapshot of the digraph.
 		      ///
 		      ///This function can be called more than once. In case of a repeated
 		      ///call, the previous snapshot gets lost.
 		      ///\param graph The digraph we make the snapshot of.
 		      void save(SmartDigraph &graph)
+		      {
 		        _graph=&graph;
 		        node_num=_graph->nodes.size();
 		        arc_num=_graph->arcs.size();
+		      }
 		      ///Undo the changes until a snapshot.
 		      ///Undo the changes until a snapshot created by save().
 		      ///
 		      ///\note After you restored a state, you cannot restore
 		      ///a later state, in other word you cannot add again the arcs deleted
 		      ///by restore().
 		      void restore()
+		      {
 		        _graph->restoreSnapshot(*this);
+		      }
 		    };
 		  };
 		  class SmartGraphBase {
 		  protected:
 		    struct NodeT {
 		      int first_out;
 		    };
 		    struct ArcT {
 		      int target;
 		      int next_out;
 		    };
 		    std::vector<NodeT> nodes;
 		    std::vector<ArcT> arcs;
 		    int first_free_arc;
 		  public:
 		    typedef SmartGraphBase Digraph;
 		    class Node;
 		    class Arc;
 		    class Edge;
 		    class Node {
 		      friend class SmartGraphBase;
 		    protected:
 		      int _id;
 		      explicit Node(int id) { _id = id;}
 		    public:
 		      Node() {}
 		      Node (Invalid) { _id = -1; }
 		      bool operator==(const Node& node) const {return _id == node._id;}
 		      bool operator!=(const Node& node) const {return _id != node._id;}
 		      bool operator<(const Node& node) const {return _id < node._id;}
 		    };
 		    class Edge {
 		      friend class SmartGraphBase;
 		    protected:
 		      int _id;
 		      explicit Edge(int id) { _id = id;}
 		    public:
 		      Edge() {}
 		      Edge (Invalid) { _id = -1; }
 		      bool operator==(const Edge& arc) const {return _id == arc._id;}
 		      bool operator!=(const Edge& arc) const {return _id != arc._id;}
 		      bool operator<(const Edge& arc) const {return _id < arc._id;}
 		    };
 		    class Arc {
 		      friend class SmartGraphBase;
 		    protected:
 		      int _id;
 		      explicit Arc(int id) { _id = id;}
 		    public:
 		      operator Edge() const {
 		        return _id != -1 ? edgeFromId(_id / 2) : INVALID;
 		      operator Edge() const {
 		        return _id != -1 ? edgeFromId(_id / 2) : INVALID;
+		      }
 		      Arc() {}
 		      Arc (Invalid) { _id = -1; }
 		      bool operator==(const Arc& arc) const {return _id == arc._id;}
 		      bool operator!=(const Arc& arc) const {return _id != arc._id;}
 		      bool operator<(const Arc& arc) const {return _id < arc._id;}
 		    };
 		    SmartGraphBase()
 		      : nodes(), arcs() {}
 		    int maxNodeId() const { return nodes.size()-1; }
 		    int maxEdgeId() const { return arcs.size() / 2 - 1; }
 		    int maxArcId() const { return arcs.size()-1; }
 		    Node source(Arc e) const { return Node(arcs[e._id ^ 1].target); }
 		    Node target(Arc e) const { return Node(arcs[e._id].target); }
 		    Node u(Edge e) const { return Node(arcs[2 * e._id].target); }
 		    Node v(Edge e) const { return Node(arcs[2 * e._id + 1].target); }
 		    static bool direction(Arc e) {
 		      return (e._id & 1) == 1;
+		    }
 		    static Arc direct(Edge e, bool d) {
 		      return Arc(e._id * 2 + (d ? 1 : 0));
+		    }
 		    void first(Node& node) const {
 		      node._id = nodes.size() - 1;
+		    }
 		    void next(Node& node) const {
 		      --node._id;
+		    }
 		    void first(Arc& arc) const {
 		      arc._id = arcs.size() - 1;
+		    }
 		    void next(Arc& arc) const {
 		      --arc._id;
+		    }
 		    void first(Edge& arc) const {
 		      arc._id = arcs.size() / 2 - 1;
+		    }
 		    void next(Edge& arc) const {
 		      --arc._id;
+		    }
 		    void firstOut(Arc &arc, const Node& v) const {
 		      arc._id = nodes[v._id].first_out;
+		    }
 		    void nextOut(Arc &arc) const {
 		      arc._id = arcs[arc._id].next_out;
+		    }
 		    void firstIn(Arc &arc, const Node& v) const {
 		      arc._id = ((nodes[v._id].first_out) ^ 1);
 		      if (arc._id == -2) arc._id = -1;
+		    }
 		    void nextIn(Arc &arc) const {
 		      arc._id = ((arcs[arc._id ^ 1].next_out) ^ 1);
 		      if (arc._id == -2) arc._id = -1;
+		    }
 		    void firstInc(Edge &arc, bool& d, const Node& v) const {
 		      int de = nodes[v._id].first_out;
 		      if (de != -1) {
 		        arc._id = de / 2;
 		        d = ((de & 1) == 1);
 		      } else {
 		        arc._id = -1;
 		        d = true;
+		      }
+		    }
 		    void nextInc(Edge &arc, bool& d) const {
 		      int de = (arcs[(arc._id * 2) | (d ? 1 : 0)].next_out);
 		      if (de != -1) {
 		        arc._id = de / 2;
 		        d = ((de & 1) == 1);
 		      } else {
 		        arc._id = -1;
 		        d = true;
+		      }
+		    }
 		    static int id(Node v) { return v._id; }
 		    static int id(Arc e) { return e._id; }
 		    static int id(Edge e) { return e._id; }
 		    static Node nodeFromId(int id) { return Node(id);}
 		    static Arc arcFromId(int id) { return Arc(id);}
 		    static Edge edgeFromId(int id) { return Edge(id);}
 		    bool valid(Node n) const {
 		      return n._id >= 0 && n._id < static_cast<int>(nodes.size());
+		    }
 		    bool valid(Arc a) const {
 		      return a._id >= 0 && a._id < static_cast<int>(arcs.size());
+		    }
 		    bool valid(Edge e) const {
 		      return e._id >= 0 && 2 * e._id < static_cast<int>(arcs.size());
+		    }
 		    Node addNode() {
 		      int n = nodes.size();
 		      nodes.push_back(NodeT());
 		      nodes[n].first_out = -1;
 		      return Node(n);
+		    }
 		    Edge addEdge(Node u, Node v) {
 		      int n = arcs.size();
 		      arcs.push_back(ArcT());
 		      arcs.push_back(ArcT());
 		      arcs[n].target = u._id;
 		      arcs[n | 1].target = v._id;
 		      arcs[n].next_out = nodes[v._id].first_out;
 		      nodes[v._id].first_out = n;
 		      arcs[n | 1].next_out = nodes[u._id].first_out;
 		      nodes[u._id].first_out = (n | 1);
 		      return Edge(n / 2);
+		    }
 		    void clear() {
 		      arcs.clear();
 		      nodes.clear();
+		    }
 		  };
 		  typedef GraphExtender<SmartGraphBase> ExtendedSmartGraphBase;
 		  /// \ingroup graphs
 		  ///
 		  /// \brief A smart undirected graph class.
 		  ///
 		  /// This is a simple and fast graph implementation.
 		  /// It is also quite memory efficient, but at the price
 		  /// that <b> it does support only limited (only stack-like)
 		  /// node and arc deletions</b>.
 		  /// Except from this it conforms to
 		  /// the \ref concepts::Graph "Graph concept".
 		  ///
 		  /// It also has an
 		  /// important extra feature that
 		  /// its maps are real \ref concepts::ReferenceMap "reference map"s.
 		  ///
 		  /// \sa concepts::Graph.
 		  ///
 		  class SmartGraph : public ExtendedSmartGraphBase {
 		  private:
 		    ///SmartGraph is \e not copy constructible. Use GraphCopy() instead.
 		    ///SmartGraph is \e not copy constructible. Use GraphCopy() instead.
 		    ///
 		    SmartGraph(const SmartGraph &) : ExtendedSmartGraphBase() {};
 		    ///\brief Assignment of SmartGraph to another one is \e not allowed.
 		    ///Use GraphCopy() instead.
 		    ///Assignment of SmartGraph to another one is \e not allowed.
 		    ///Use GraphCopy() instead.
 		    void operator=(const SmartGraph &) {}
 		  public:
 		    typedef ExtendedSmartGraphBase Parent;
 		    /// Constructor
 		    /// Constructor.
 		    ///
 		    SmartGraph() {}
 		    ///Add a new node to the graph.
 		    /// \return the new node.
 		    ///
 		    Node addNode() { return Parent::addNode(); }
 		    ///Add a new edge to the graph.
 		    ///Add a new edge to the graph with node \c s
 		    ///and \c t.
 		    ///\return the new edge.
 		    Edge addEdge(const Node& s, const Node& t) {
 		      return Parent::addEdge(s, t);
+		    }
 		    /// \brief Node validity check
 		    ///
 		    /// This function gives back true if the given node is valid,
 		    /// ie. it is a real node of the graph.
 		    ///
 		    /// \warning A removed node (using Snapshot) could become valid again
 		    /// when new nodes are added to the graph.
 		    bool valid(Node n) const { return Parent::valid(n); }
 		    /// \brief Arc validity check
 		    ///
 		    /// This function gives back true if the given arc is valid,
 		    /// ie. it is a real arc of the graph.
 		    ///
 		    /// \warning A removed arc (using Snapshot) could become valid again
 		    /// when new edges are added to the graph.
 		    bool valid(Arc a) const { return Parent::valid(a); }
 		    /// \brief Edge validity check
 		    ///
 		    /// This function gives back true if the given edge is valid,
 		    /// ie. it is a real edge of the graph.
 		    ///
 		    /// \warning A removed edge (using Snapshot) could become valid again
 		    /// when new edges are added to the graph.
 		    bool valid(Edge e) const { return Parent::valid(e); }
 		    ///Clear the graph.
 		    ///Erase all the nodes and edges from the graph.
 		    ///
 		    void clear() {
 		      Parent::clear();
+		    }
 		  public:
 		    class Snapshot;
 		  protected:
 		    void saveSnapshot(Snapshot &s)
+		    {
 		      s._graph = this;
 		      s.node_num = nodes.size();
 		      s.arc_num = arcs.size();
+		    }
 		    void restoreSnapshot(const Snapshot &s)
+		    {
 		      while(s.arc_num<arcs.size()) {
 		        int n=arcs.size()-1;
 		        Edge arc=edgeFromId(n/2);
 		        Parent::notifier(Edge()).erase(arc);
 		        std::vector<Arc> dir;
 		        dir.push_back(arcFromId(n));
 		        dir.push_back(arcFromId(n-1));
 		        Parent::notifier(Arc()).erase(dir);
 		        nodes[arcs[n].target].first_out=arcs[n].next_out;
 		        nodes[arcs[n-1].target].first_out=arcs[n-1].next_out;
 		        arcs.pop_back();
 		        arcs.pop_back();
+		      }
 		      while(s.node_num<nodes.size()) {
 		        int n=nodes.size()-1;
 		        Node node = nodeFromId(n);
 		        Parent::notifier(Node()).erase(node);
 		        nodes.pop_back();
+		      }
+		    }
 		  public:
 		    ///Class to make a snapshot of the digraph and to restrore to it later.
 		    ///Class to make a snapshot of the digraph and to restrore to it later.
 		    ///
 		    ///The newly added nodes and arcs can be removed using the
 		    ///restore() function.
 		    ///
 		    ///\note After you restore a state, you cannot restore
 		    ///a later state, in other word you cannot add again the arcs deleted
 		    ///by restore() using another one Snapshot instance.
 		    ///
 		    ///\warning If you do not use correctly the snapshot that can cause
 		    ///either broken program, invalid state of the digraph, valid but
 		    ///not the restored digraph or no change. Because the runtime performance
 		    ///the validity of the snapshot is not stored.
 		    class Snapshot
+		    {
 		      SmartGraph *_graph;
 		    protected:
 		      friend class SmartGraph;
 		      unsigned int node_num;
 		      unsigned int arc_num;
 		    public:
 		      ///Default constructor.
 		      ///Default constructor.
 		      ///To actually make a snapshot you must call save().
 		      ///
 		      Snapshot() : _graph(0) {}
 		      ///Constructor that immediately makes a snapshot
 		      ///This constructor immediately makes a snapshot of the digraph.
 		      ///\param graph The digraph we make a snapshot of.
 		      Snapshot(SmartGraph &graph) {
 		        graph.saveSnapshot(*this);
+		      }
 		      ///Make a snapshot.
 		      ///Make a snapshot of the graph.
 		      ///
 		      ///This function can be called more than once. In case of a repeated
 		      ///call, the previous snapshot gets lost.
 		      ///\param graph The digraph we make the snapshot of.
 		      void save(SmartGraph &graph)
+		      {
 		        graph.saveSnapshot(*this);
+		      }
 		      ///Undo the changes until a snapshot.
 		      ///Undo the changes until a snapshot created by save().
 		      ///
 		      ///\note After you restored a state, you cannot restore
 		      ///a later state, in other word you cannot add again the arcs deleted
 		      ///by restore().
 		      void restore()
+		      {
 		        _graph->restoreSnapshot(*this);
+		      }
 		    };
 		  };
 		} //namespace lemon
 		#endif //LEMON_SMART_GRAPH_H

scripts/unify-sources.sh

Show inline comments

 		#!/bin/bash
 		YEAR=`date +2003-%Y`
 		HGROOT=`hg root`
 		# file enumaration modes
 		function all_files() {
 		    hg status -a -m -c |
 		    cut -d ' ' -f 2 | grep -E '(\.(cc|h|dox)$|Makefile\.am$)' |
 		    while read file; do echo $HGROOT/$file; done
+		}
 		function modified_files() {
 		    hg status -a -m |
 		    cut -d ' ' -f 2 | grep -E  '(\.(cc|h|dox)$|Makefile\.am$)' |
 		    while read file; do echo $HGROOT/$file; done
+		}
 		function changed_files() {
+		    {
 		        if [ -n "$HG_PARENT1" ]
 		        then
 		            hg status --rev $HG_PARENT1:$HG_NODE -a -m
 		        fi
 		        if [ -n "$HG_PARENT2" ]
 		        then
 		            hg status --rev $HG_PARENT2:$HG_NODE -a -m
 		        fi
 		    } | cut -d ' ' -f 2 | grep -E '(\.(cc|h|dox)$|Makefile\.am$)' |
 		    sort | uniq |
 		    while read file; do echo $HGROOT/$file; done
+		}
 		function given_files() {
 		    for file in $GIVEN_FILES
 		    do
 			echo $file
 		    done
+		}
 		# actions
 		function update_action() {
 		    if ! diff -q $1 $2 >/dev/null
 		    then
 			echo -n " [$3 updated]"
 			rm $2
 			mv $1 $2
 			CHANGED=YES
 		    fi
+		}
 		function update_warning() {
 		    echo -n " [$2 warning]"
 		    WARNED=YES
+		}
 		function update_init() {
 		    echo Update source files...
 		    TOTAL_FILES=0
 		    CHANGED_FILES=0
 		    WARNED_FILES=0
+		}
 		function update_done() {
 		    echo $CHANGED_FILES out of $TOTAL_FILES files has been changed.
 		    echo $WARNED_FILES out of $TOTAL_FILES files triggered warnings.
+		}
 		function update_begin() {
 		    ((TOTAL_FILES++))
 		    CHANGED=NO
 		    WARNED=NO
+		}
 		function update_end() {
 		    if [ $CHANGED == YES ]
 		    then
 			((++CHANGED_FILES))
 		    fi
 		    if [ $WARNED == YES ]
 		    then
 			((++WARNED_FILES))
 		    fi
+		}
 		function check_action() {
 		    if ! diff -q $1 $2 >/dev/null
 		    then
-			echo -n " [$3 failed]"
 			echo
 			echo -n "      $3 failed at line(s): "
 			echo -n $(diff $1 $2 | grep '^[0-9]' | sed "s/^\(.*\)c.*$/ \1/g" |
 			          sed "s/,/-/g" | paste -s -d',')
 			FAILED=YES
 		    fi
+		}
 		function check_warning() {
-		    echo -n " [$2 warning]"
 		    echo
 		    if [ "$2" == 'long lines' ]
 		    then
 		        echo -n "      $2 warning at line(s): "
 		        echo -n $(grep -n -E '.{81,}' $1 | sed "s/^\([0-9]*\)/ \1\t/g" |
 		                  cut -f 1 | paste -s -d',')
 		    else
 		        echo -n "      $2 warning"
 		    fi
 		    WARNED=YES
+		}
 		function check_init() {
 		    echo Check source files...
 		    FAILED_FILES=0
 		    WARNED_FILES=0
 		    TOTAL_FILES=0
+		}
 		function check_done() {
 		    echo $FAILED_FILES out of $TOTAL_FILES files has been failed.
 		    echo $WARNED_FILES out of $TOTAL_FILES files triggered warnings.
 		    if [ $FAILED_FILES -gt 0 ]
 		    then
 			return 1
 		    elif [ $WARNED_FILES -gt 0 ]
 		    then
 			if [ "$WARNING" == 'INTERACTIVE' ]
 			then
 			    echo -n "Are the files with warnings acceptable? (yes/no) "
 			    while read answer
 			    do
 				if [ "$answer" == 'yes' ]
 				then
 				    return 0
 				elif [ "$answer" == 'no' ]
 				then
 				    return 1
 				fi
 				echo -n "Are the files with warnings acceptable? (yes/no) "
 			    done
 			elif [ "$WARNING" == 'WERROR' ]
 			then
 			    return 1
 			fi
 		    fi
+		}
 		function check_begin() {
 		    ((TOTAL_FILES++))
 		    FAILED=NO
 		    WARNED=NO
+		}
 		function check_end() {
 		    if [ $FAILED == YES ]
 		    then
 			((++FAILED_FILES))
 		    fi
 		    if [ $WARNED == YES ]
 		    then
 			((++WARNED_FILES))
 		    fi
+		}
 		# checks
 		function header_check() {
 		    if echo $1 | grep -q -E 'Makefile\.am$'
 		    then
 			return
 		    fi
 		    TMP_FILE=`mktemp`
 		    (echo "/* -*- mode: C++; indent-tabs-mode: nil; -*-
+		 *
 		 * This file is a part of LEMON, a generic C++ optimization library.
+		 *
 		 * Copyright (C) "$YEAR"
 		 * 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.
+		 *
 		 */
+		"
 		    awk 'BEGIN { pm=0; }
 		     pm==3 { print }
 		     /\/\* / && pm==0 { pm=1;}
 		     /[^:blank:]/ && (pm==0 || pm==2) { pm=3; print;}
 		     /\*\// && pm==1 { pm=2;}
 		    ' $1
 		    ) >$TMP_FILE
 		    "$ACTION"_action "$TMP_FILE" "$1" header
+		}
 		function tabs_check() {
 		    if echo $1 | grep -q -v -E 'Makefile\.am$'
 		    then
 		        OLD_PATTERN=$(echo -e '\t')
 		        NEW_PATTERN='        '
 		    else
 		        OLD_PATTERN='        '
 		        NEW_PATTERN=$(echo -e '\t')
 		    fi
 		    TMP_FILE=`mktemp`
 		    cat $1 | sed -e "s/$OLD_PATTERN/$NEW_PATTERN/g" >$TMP_FILE
 		    "$ACTION"_action "$TMP_FILE" "$1" 'tabs'
+		}
 		function spaces_check() {
 		    TMP_FILE=`mktemp`
 		    cat $1 | sed -e 's/ \+$//g' >$TMP_FILE
 		    "$ACTION"_action "$TMP_FILE" "$1" 'spaces'
+		    "$ACTION"_action "$TMP_FILE" "$1" 'trailing spaces'
+		}
 		function long_lines_check() {
 		    if cat $1 | grep -q -E '.{81,}'
 		    then
 			"$ACTION"_warning $1 'long lines'
 		    fi
+		}
 		# process the file
 		function process_file() {
-		    echo -n "    $ACTION " $1...
+		    echo -n "    $ACTION $1..."
 		    CHECKING="header tabs spaces long_lines"
 		    "$ACTION"_begin $1
 		    for check in $CHECKING
 		    do
 			"$check"_check $1
 		    done
 		    "$ACTION"_end $1
 		    echo
+		}
 		function process_all {
 		    "$ACTION"_init
 		    while read file
 		    do
 			process_file $file
 		    done < <($FILES)
 		    "$ACTION"_done
+		}
 		while [ $# -gt 0 ]
 		do
 		    if [ "$1" == '--help' ] || [ "$1" == '-h' ]
 		    then
 			echo -n \
 		"Usage:
 		  $0 [OPTIONS] [files]
 		Options:
 		  --dry-run|-n
 		     Check the files, but do not modify them.
 		  --interactive|-i
 		     If --dry-run is specified and the checker emits warnings,
 		     then the user is asked if the warnings should be considered
 		     errors.
 		  --werror|-w
 		     Make all warnings into errors.
 		  --all|-a
-		     All files in the repository will be checked.
+		     Check all source files in the repository.
 		  --modified|-m
 		     Check only the modified (and new) source files. This option is
 		     useful to check the modification before making a commit.
 		  --changed|-c
 		     Check only the changed source files compared to the parent(s) of
 		     the current hg node.  This option is useful as hg hook script.
 		     To automatically check all your changes before making a commit,
 		     add the following section to the appropriate .hg/hgrc file.
 		       [hooks]
 		       pretxncommit.checksources = scripts/unify-sources.sh -c -n -i
 		  --help|-h
 		     Print this help message.
 		  files
 		     The files to check/unify. If no file names are given, the
 		     modified source will be checked/unified
+		     The files to check/unify. If no file names are given, the modified
 		     source files will be checked/unified (just like using the
 		     --modified|-m option).
+		"
 		        exit 0
 		    elif [ "$1" == '--dry-run' ] || [ "$1" == '-n' ]
 		    then
-			[ -n "$ACTION" ] && echo "Invalid option $1" >&2 && exit 1
+			[ -n "$ACTION" ] && echo "Conflicting action options" >&2 && exit 1
 			ACTION=check
 		    elif [ "$1" == "--all" ] || [ "$1" == '-a' ]
 		    then
-			[ -n "$FILES" ] && echo "Invalid option $1" >&2 && exit 1
+			[ -n "$FILES" ] && echo "Conflicting target options" >&2 && exit 1
 			FILES=all_files
 		    elif [ "$1" == "--changed" ] || [ "$1" == '-c' ]
 		    then
-			[ -n "$FILES" ] && echo "Invalid option $1" >&2 && exit 1
+			[ -n "$FILES" ] && echo "Conflicting target options" >&2 && exit 1
 			FILES=changed_files
 		    elif [ "$1" == "--modified" ] || [ "$1" == '-m' ]
 		    then
-			[ -n "$FILES" ] && echo "Invalid option $1" >&2 && exit 1
+			[ -n "$FILES" ] && echo "Conflicting target options" >&2 && exit 1
 			FILES=modified_files
 		    elif [ "$1" == "--interactive" ] || [ "$1" == "-i" ]
 		    then
-			[ -n "$WARNING" ] && echo "Invalid option $1" >&2 && exit 1
+			[ -n "$WARNING" ] && echo "Conflicting warning options" >&2 && exit 1
 			WARNING='INTERACTIVE'
 		    elif [ "$1" == "--werror" ] || [ "$1" == "-w" ]
 		    then
-			[ -n "$WARNING" ] && echo "Invalid option $1" >&2 && exit 1
+			[ -n "$WARNING" ] && echo "Conflicting warning options" >&2 && exit 1
 			WARNING='WERROR'
-		    elif [ $(echo $1 | cut -c 1) == '-' ]
+		    elif [ $(echo x$1 | cut -c 2) == '-' ]
 		    then
 			echo "Invalid option $1" >&2 && exit 1
 		    else
 			[ -n "$FILES" ] && echo "Invalid option $1" >&2 && exit 1
 			GIVEN_FILES=$@
 			FILES=given_files
 			break
 		    fi
 		    shift
 		done
 		if [ -z $FILES ]
 		then
 		    FILES=modified_files
 		fi
 		if [ -z $ACTION ]
 		then
 		    ACTION=update
 		fi
 		process_all

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