LEMON/LEMON-official Changeset - r645:a3402913cffe

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Changeset - r645:a3402913cffe

« 620:37216c

646:f63e87 »

r645:a3402913cffe

Sat, 18 Apr 2009 21:54:30

[Not Reviewed]

0 comments (0 inline)

deba@inf.elte.hu
deba@inf.elte.hu

Add more docs to LGF function interface (#109)

0 2 0

default

2 files changed with 309 insertions and 190 deletions:

lemon/lgf_reader.h

165

104

lemon/lgf_writer.h

144

↑ Collapse diff ↑

lemon/lgf_reader.h

Show inline comments

@@ -56,183 +56,183 @@
 		          throw FormatError("Remaining characters in token");
+		        }
 		        return value;
+		      }
 		    };
 		    template <>
 		    struct DefaultConverter<std::string> {
 		      std::string operator()(const std::string& str) {
 		        return str;
+		      }
 		    };
 		    template <typename _Item>
 		    class MapStorageBase {
 		    public:
 		      typedef _Item Item;
 		    public:
 		      MapStorageBase() {}
 		      virtual ~MapStorageBase() {}
 		      virtual void set(const Item& item, const std::string& value) = 0;
 		    };
 		    template <typename _Item, typename _Map,
 		              typename _Converter = DefaultConverter<typename _Map::Value> >
 		    class MapStorage : public MapStorageBase<_Item> {
 		    public:
 		      typedef _Map Map;
 		      typedef _Converter Converter;
 		      typedef _Item Item;
 		    private:
 		      Map& _map;
 		      Converter _converter;
 		    public:
 		      MapStorage(Map& map, const Converter& converter = Converter())
 		        : _map(map), _converter(converter) {}
 		      virtual ~MapStorage() {}
 		      virtual void set(const Item& item ,const std::string& value) {
 		        _map.set(item, _converter(value));
+		      }
 		    };
-		    template <typename _Graph, bool _dir, typename _Map,
+		    template <typename _GR, bool _dir, typename _Map,
 		              typename _Converter = DefaultConverter<typename _Map::Value> >
-		    class GraphArcMapStorage : public MapStorageBase<typename _Graph::Edge> {
+		    class GraphArcMapStorage : public MapStorageBase<typename _GR::Edge> {
 		    public:
 		      typedef _Map Map;
 		      typedef _Converter Converter;
 		      typedef _Graph Graph;
 		      typedef typename Graph::Edge Item;
 		      typedef _GR GR;
 		      typedef typename GR::Edge Item;
 		      static const bool dir = _dir;
 		    private:
-		      const Graph& _graph;
+		      const GR& _graph;
 		      Map& _map;
 		      Converter _converter;
 		    public:
-		      GraphArcMapStorage(const Graph& graph, Map& map,
+		      GraphArcMapStorage(const GR& graph, Map& map,
 		                         const Converter& converter = Converter())
 		        : _graph(graph), _map(map), _converter(converter) {}
 		      virtual ~GraphArcMapStorage() {}
 		      virtual void set(const Item& item ,const std::string& value) {
 		        _map.set(_graph.direct(item, dir), _converter(value));
+		      }
 		    };
 		    class ValueStorageBase {
 		    public:
 		      ValueStorageBase() {}
 		      virtual ~ValueStorageBase() {}
 		      virtual void set(const std::string&) = 0;
 		    };
 		    template <typename _Value, typename _Converter = DefaultConverter<_Value> >
 		    class ValueStorage : public ValueStorageBase {
 		    public:
 		      typedef _Value Value;
 		      typedef _Converter Converter;
 		    private:
 		      Value& _value;
 		      Converter _converter;
 		    public:
 		      ValueStorage(Value& value, const Converter& converter = Converter())
 		        : _value(value), _converter(converter) {}
 		      virtual void set(const std::string& value) {
 		        _value = _converter(value);
+		      }
 		    };
 		    template <typename Value>
 		    struct MapLookUpConverter {
 		      const std::map<std::string, Value>& _map;
 		      MapLookUpConverter(const std::map<std::string, Value>& map)
 		        : _map(map) {}
 		      Value operator()(const std::string& str) {
 		        typename std::map<std::string, Value>::const_iterator it =
 		          _map.find(str);
 		        if (it == _map.end()) {
 		          std::ostringstream msg;
 		          msg << "Item not found: " << str;
 		          throw FormatError(msg.str());
+		        }
 		        return it->second;
+		      }
 		    };
-		    template <typename Graph>
+		    template <typename GR>
 		    struct GraphArcLookUpConverter {
 		      const Graph& _graph;
 		      const std::map<std::string, typename Graph::Edge>& _map;
 		      GraphArcLookUpConverter(const Graph& graph,
 		      const GR& _graph;
 		      const std::map<std::string, typename GR::Edge>& _map;
 		      GraphArcLookUpConverter(const GR& graph,
 		                              const std::map<std::string,
-		                                             typename Graph::Edge>& map)
+		                                             typename GR::Edge>& map)
 		        : _graph(graph), _map(map) {}
-		      typename Graph::Arc operator()(const std::string& str) {
+		      typename GR::Arc operator()(const std::string& str) {
 		        if (str.empty() || (str[0] != '+' && str[0] != '-')) {
 		          throw FormatError("Item must start with '+' or '-'");
+		        }
-		        typename std::map<std::string, typename Graph::Edge>
+		        typename std::map<std::string, typename GR::Edge>
 		          ::const_iterator it = _map.find(str.substr(1));
 		        if (it == _map.end()) {
 		          throw FormatError("Item not found");
+		        }
 		        return _graph.direct(it->second, str[0] == '+');
+		      }
 		    };
 		    inline bool isWhiteSpace(char c) {
 		      return c == ' ' || c == '\t' || c == '\v' ||
 		        c == '\n' || c == '\r' || c == '\f';
+		    }
 		    inline bool isOct(char c) {
 		      return '0' <= c && c <='7';
+		    }
 		    inline int valueOct(char c) {
 		      LEMON_ASSERT(isOct(c), "The character is not octal.");
 		      return c - '0';
+		    }
 		    inline bool isHex(char c) {
 		      return ('0' <= c && c <= '9') ||
 		        ('a' <= c && c <= 'z') ||
 		        ('A' <= c && c <= 'Z');
+		    }
 		    inline int valueHex(char c) {
 		      LEMON_ASSERT(isHex(c), "The character is not hexadecimal.");
 		      if ('0' <= c && c <= '9') return c - '0';
 		      if ('a' <= c && c <= 'z') return c - 'a' + 10;
 		      return c - 'A' + 10;
+		    }
 		    inline bool isIdentifierFirstChar(char c) {
 		      return ('a' <= c && c <= 'z') ||
 		        ('A' <= c && c <= 'Z') || c == '_';
+		    }
 		    inline bool isIdentifierChar(char c) {
 		      return isIdentifierFirstChar(c) ||
 		        ('0' <= c && c <= '9');
+		    }
 		    inline char readEscape(std::istream& is) {
 		      char c;
 		      if (!is.get(c))
@@ -342,276 +342,275 @@
 		        while (is.get(c) && c != '@') {
 		          if (c == '\n') {
 		            ++line_num;
 		          } else if (c == '#') {
 		            getline(is, line);
 		            ++line_num;
 		          } else if (!isWhiteSpace(c)) {
 		            is.putback(c);
 		            getline(is, line);
 		            _functor(line);
 		            ++line_num;
+		          }
+		        }
 		        if (is) is.putback(c);
 		        else if (is.eof()) is.clear();
+		      }
 		    };
 		    template <typename Functor>
 		    class StreamSection : public Section {
 		    private:
 		      Functor _functor;
 		    public:
 		      StreamSection(const Functor& functor) : _functor(functor) {}
 		      virtual ~StreamSection() {}
 		      virtual void process(std::istream& is, int& line_num) {
 		        _functor(is, line_num);
 		        char c;
 		        std::string line;
 		        while (is.get(c) && c != '@') {
 		          if (c == '\n') {
 		            ++line_num;
 		          } else if (!isWhiteSpace(c)) {
 		            getline(is, line);
 		            ++line_num;
+		          }
+		        }
 		        if (is) is.putback(c);
 		        else if (is.eof()) is.clear();
+		      }
 		    };
+		  }
-		  template <typename Digraph>
+		  template <typename DGR>
 		  class DigraphReader;
 		  template <typename Digraph>
 		  DigraphReader<Digraph> digraphReader(Digraph& digraph,
 		                                       std::istream& is = std::cin);
 		  template <typename Digraph>
 		  DigraphReader<Digraph> digraphReader(Digraph& digraph, const std::string& fn);
 		  template <typename Digraph>
-		  DigraphReader<Digraph> digraphReader(Digraph& digraph, const char *fn);
+		  template <typename TDGR>
 		  DigraphReader<TDGR> digraphReader(TDGR& digraph, std::istream& is = std::cin);
 		  template <typename TDGR>
 		  DigraphReader<TDGR> digraphReader(TDGR& digraph, const std::string& fn);
 		  template <typename TDGR>
 		  DigraphReader<TDGR> digraphReader(TDGR& digraph, const char *fn);
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief \ref lgf-format "LGF" reader for directed graphs
 		  ///
 		  /// This utility reads an \ref lgf-format "LGF" file.
 		  ///
 		  /// The reading method does a batch processing. The user creates a
 		  /// reader object, then various reading rules can be added to the
 		  /// reader, and eventually the reading is executed with the \c run()
 		  /// member function. A map reading rule can be added to the reader
 		  /// with the \c nodeMap() or \c arcMap() members. An optional
 		  /// converter parameter can also be added as a standard functor
 		  /// converting from \c std::string to the value type of the map. If it
 		  /// is set, it will determine how the tokens in the file should be
 		  /// converted to the value type of the map. If the functor is not set,
 		  /// then a default conversion will be used. One map can be read into
 		  /// multiple map objects at the same time. The \c attribute(), \c
 		  /// node() and \c arc() functions are used to add attribute reading
 		  /// rules.
 		  ///
 		  ///\code
-		  /// DigraphReader<Digraph>(digraph, std::cin).
+		  /// DigraphReader<DGR>(digraph, std::cin).
 		  ///   nodeMap("coordinates", coord_map).
 		  ///   arcMap("capacity", cap_map).
 		  ///   node("source", src).
 		  ///   node("target", trg).
 		  ///   attribute("caption", caption).
 		  ///   run();
 		  ///\endcode
 		  ///
 		  /// By default the reader uses the first section in the file of the
 		  /// proper type. If a section has an optional name, then it can be
 		  /// selected for reading by giving an optional name parameter to the
 		  /// \c nodes(), \c arcs() or \c attributes() functions.
 		  ///
 		  /// The \c useNodes() and \c useArcs() functions are used to tell the reader
 		  /// that the nodes or arcs should not be constructed (added to the
 		  /// graph) during the reading, but instead the label map of the items
 		  /// are given as a parameter of these functions. An
 		  /// application of these functions is multipass reading, which is
 		  /// important if two \c \@arcs sections must be read from the
 		  /// file. In this case the first phase would read the node set and one
 		  /// of the arc sets, while the second phase would read the second arc
 		  /// set into an \e ArcSet class (\c SmartArcSet or \c ListArcSet).
 		  /// The previously read label node map should be passed to the \c
 		  /// useNodes() functions. Another application of multipass reading when
 		  /// paths are given as a node map or an arc map.
 		  /// It is impossible to read this in
 		  /// a single pass, because the arcs are not constructed when the node
 		  /// maps are read.
-		  template <typename GR>
+		  template <typename DGR>
 		  class DigraphReader {
 		  public:
-		    typedef GR Digraph;
+		    typedef DGR Digraph;
 		  private:
-		    TEMPLATE_DIGRAPH_TYPEDEFS(Digraph);
+		    TEMPLATE_DIGRAPH_TYPEDEFS(DGR);
 		    std::istream* _is;
 		    bool local_is;
 		    std::string _filename;
-		    Digraph& _digraph;
+		    DGR& _digraph;
 		    std::string _nodes_caption;
 		    std::string _arcs_caption;
 		    std::string _attributes_caption;
 		    typedef std::map<std::string, Node> NodeIndex;
 		    NodeIndex _node_index;
 		    typedef std::map<std::string, Arc> ArcIndex;
 		    ArcIndex _arc_index;
 		    typedef std::vector<std::pair<std::string,
 		      _reader_bits::MapStorageBase<Node>*> > NodeMaps;
 		    NodeMaps _node_maps;
 		    typedef std::vector<std::pair<std::string,
 		      _reader_bits::MapStorageBase<Arc>*> >ArcMaps;
 		    ArcMaps _arc_maps;
 		    typedef std::multimap<std::string, _reader_bits::ValueStorageBase*>
 		      Attributes;
 		    Attributes _attributes;
 		    bool _use_nodes;
 		    bool _use_arcs;
 		    bool _skip_nodes;
 		    bool _skip_arcs;
 		    int line_num;
 		    std::istringstream line;
 		  public:
 		    /// \brief Constructor
 		    ///
 		    /// Construct a directed graph reader, which reads from the given
 		    /// input stream.
-		    DigraphReader(Digraph& digraph, std::istream& is = std::cin)
+		    DigraphReader(DGR& digraph, std::istream& is = std::cin)
 		      : _is(&is), local_is(false), _digraph(digraph),
 		        _use_nodes(false), _use_arcs(false),
 		        _skip_nodes(false), _skip_arcs(false) {}
 		    /// \brief Constructor
 		    ///
 		    /// Construct a directed graph reader, which reads from the given
 		    /// file.
-		    DigraphReader(Digraph& digraph, const std::string& fn)
+		    DigraphReader(DGR& digraph, const std::string& fn)
 		      : _is(new std::ifstream(fn.c_str())), local_is(true),
 		        _filename(fn), _digraph(digraph),
 		        _use_nodes(false), _use_arcs(false),
 		        _skip_nodes(false), _skip_arcs(false) {
 		      if (!(*_is)) {
 		        delete _is;
 		        throw IoError("Cannot open file", fn);
+		      }
+		    }
 		    /// \brief Constructor
 		    ///
 		    /// Construct a directed graph reader, which reads from the given
 		    /// file.
-		    DigraphReader(Digraph& digraph, const char* fn)
+		    DigraphReader(DGR& digraph, const char* fn)
 		      : _is(new std::ifstream(fn)), local_is(true),
 		        _filename(fn), _digraph(digraph),
 		        _use_nodes(false), _use_arcs(false),
 		        _skip_nodes(false), _skip_arcs(false) {
 		      if (!(*_is)) {
 		        delete _is;
 		        throw IoError("Cannot open file", fn);
+		      }
+		    }
 		    /// \brief Destructor
 		    ~DigraphReader() {
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        delete it->second;
+		      }
 		      for (typename ArcMaps::iterator it = _arc_maps.begin();
 		           it != _arc_maps.end(); ++it) {
 		        delete it->second;
+		      }
 		      for (typename Attributes::iterator it = _attributes.begin();
 		           it != _attributes.end(); ++it) {
 		        delete it->second;
+		      }
 		      if (local_is) {
 		        delete _is;
+		      }
+		    }
 		  private:
 		    template <typename DGR>
 		    friend DigraphReader<DGR> digraphReader(DGR& digraph, std::istream& is);
 		    template <typename DGR>
 		    friend DigraphReader<DGR> digraphReader(DGR& digraph,
 		                                            const std::string& fn);
 		    template <typename DGR>
-		    friend DigraphReader<DGR> digraphReader(DGR& digraph, const char *fn);
+		    template <typename TDGR>
 		    friend DigraphReader<TDGR> digraphReader(TDGR& digraph, std::istream& is);
 		    template <typename TDGR>
 		    friend DigraphReader<TDGR> digraphReader(TDGR& digraph,
 		                                             const std::string& fn);
 		    template <typename TDGR>
 		    friend DigraphReader<TDGR> digraphReader(TDGR& digraph, const char *fn);
 		    DigraphReader(DigraphReader& other)
 		      : _is(other._is), local_is(other.local_is), _digraph(other._digraph),
 		        _use_nodes(other._use_nodes), _use_arcs(other._use_arcs),
 		        _skip_nodes(other._skip_nodes), _skip_arcs(other._skip_arcs) {
 		      other._is = 0;
 		      other.local_is = false;
 		      _node_index.swap(other._node_index);
 		      _arc_index.swap(other._arc_index);
 		      _node_maps.swap(other._node_maps);
 		      _arc_maps.swap(other._arc_maps);
 		      _attributes.swap(other._attributes);
 		      _nodes_caption = other._nodes_caption;
 		      _arcs_caption = other._arcs_caption;
 		      _attributes_caption = other._attributes_caption;
+		    }
 		    DigraphReader& operator=(const DigraphReader&);
 		  public:
 		    /// \name Reading rules
 		    /// @{
 		    /// \brief Node map reading rule
 		    ///
 		    /// Add a node map reading rule to the reader.
 		    template <typename Map>
 		    DigraphReader& nodeMap(const std::string& caption, Map& map) {
 		      checkConcept<concepts::WriteMap<Node, typename Map::Value>, Map>();
 		      _reader_bits::MapStorageBase<Node>* storage =
 		        new _reader_bits::MapStorage<Node, Map>(map);
 		      _node_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Node map reading rule
 		    ///
 		    /// Add a node map reading rule with specialized converter to the
 		    /// reader.
 		    template <typename Map, typename Converter>
 		    DigraphReader& nodeMap(const std::string& caption, Map& map,
 		                           const Converter& converter = Converter()) {
@@ -1143,439 +1142,466 @@
 		          if (line >> c)
 		            throw FormatError("Extra character at the end of line");
 		          if (section == "nodes" && !nodes_done) {
 		            if (_nodes_caption.empty() || _nodes_caption == caption) {
 		              readNodes();
 		              nodes_done = true;
+		            }
 		          } else if ((section == "arcs" || section == "edges") &&
 		                     !arcs_done) {
 		            if (_arcs_caption.empty() || _arcs_caption == caption) {
 		              readArcs();
 		              arcs_done = true;
+		            }
 		          } else if (section == "attributes" && !attributes_done) {
 		            if (_attributes_caption.empty() || _attributes_caption == caption) {
 		              readAttributes();
 		              attributes_done = true;
+		            }
 		          } else {
 		            readLine();
 		            skipSection();
+		          }
 		        } catch (FormatError& error) {
 		          error.line(line_num);
 		          error.file(_filename);
 		          throw;
+		        }
+		      }
 		      if (!nodes_done) {
 		        throw FormatError("Section @nodes not found");
+		      }
 		      if (!arcs_done) {
 		        throw FormatError("Section @arcs not found");
+		      }
 		      if (!attributes_done && !_attributes.empty()) {
 		        throw FormatError("Section @attributes not found");
+		      }
+		    }
 		    /// @}
 		  };
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief Return a \ref DigraphReader class
 		  ///
 		  /// This function just returns a \ref DigraphReader class.
 		  ///
 		  /// With this function a digraph can be read from an
 		  /// \ref lgf-format "LGF" file or input stream with several maps and
 		  /// attributes. For example, there is network flow problem on a
 		  /// digraph, i.e. a digraph with a \e capacity map on the arcs and
 		  /// \e source and \e target nodes. This digraph can be read with the
 		  /// following code:
 		  ///
 		  ///\code
 		  ///ListDigraph digraph;
 		  ///ListDigraph::ArcMap<int> cm(digraph);
 		  ///ListDigraph::Node src, trg;
 		  ///digraphReader(digraph, std::cin).
 		  ///  arcMap("capacity", cap).
 		  ///  node("source", src).
 		  ///  node("target", trg).
 		  ///  run();
 		  ///\endcode
 		  ///
 		  /// For a complete documentation, please see the \ref DigraphReader
 		  /// class documentation.
 		  /// \warning Don't forget to put the \ref DigraphReader::run() "run()"
 		  /// to the end of the parameter list.
 		  /// \relates DigraphReader
 		  /// \sa digraphReader(TDGR& digraph, const std::string& fn)
 		  /// \sa digraphReader(TDGR& digraph, const char* fn)
 		  template <typename TDGR>
 		  DigraphReader<TDGR> digraphReader(TDGR& digraph, std::istream& is) {
 		    DigraphReader<TDGR> tmp(digraph, is);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref DigraphReader class
 		  ///
 		  /// This function just returns a \ref DigraphReader class.
 		  /// \relates DigraphReader
 		  template <typename Digraph>
 		  DigraphReader<Digraph> digraphReader(Digraph& digraph, std::istream& is) {
-		    DigraphReader<Digraph> tmp(digraph, is);
+		  /// \sa digraphReader(TDGR& digraph, std::istream& is)
 		  template <typename TDGR>
 		  DigraphReader<TDGR> digraphReader(TDGR& digraph, const std::string& fn) {
 		    DigraphReader<TDGR> tmp(digraph, fn);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref DigraphReader class
 		  ///
 		  /// This function just returns a \ref DigraphReader class.
 		  /// \relates DigraphReader
 		  template <typename Digraph>
 		  DigraphReader<Digraph> digraphReader(Digraph& digraph,
 		                                       const std::string& fn) {
 		    DigraphReader<Digraph> tmp(digraph, fn);
 		  /// \sa digraphReader(TDGR& digraph, std::istream& is)
 		  template <typename TDGR>
 		  DigraphReader<TDGR> digraphReader(TDGR& digraph, const char* fn) {
 		    DigraphReader<TDGR> tmp(digraph, fn);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref DigraphReader class
 		  ///
 		  /// This function just returns a \ref DigraphReader class.
 		  /// \relates DigraphReader
 		  template <typename Digraph>
 		  DigraphReader<Digraph> digraphReader(Digraph& digraph, const char* fn) {
 		    DigraphReader<Digraph> tmp(digraph, fn);
 		    return tmp;
+		  }
-		  template <typename Graph>
+		  template <typename GR>
 		  class GraphReader;
 		  template <typename Graph>
 		  GraphReader<Graph> graphReader(Graph& graph,
 		                                 std::istream& is = std::cin);
 		  template <typename Graph>
 		  GraphReader<Graph> graphReader(Graph& graph, const std::string& fn);
 		  template <typename Graph>
-		  GraphReader<Graph> graphReader(Graph& graph, const char *fn);
+		  template <typename TGR>
 		  GraphReader<TGR> graphReader(TGR& graph, std::istream& is = std::cin);
 		  template <typename TGR>
 		  GraphReader<TGR> graphReader(TGR& graph, const std::string& fn);
 		  template <typename TGR>
 		  GraphReader<TGR> graphReader(TGR& graph, const char *fn);
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief \ref lgf-format "LGF" reader for undirected graphs
 		  ///
 		  /// This utility reads an \ref lgf-format "LGF" file.
 		  ///
 		  /// It can be used almost the same way as \c DigraphReader.
 		  /// The only difference is that this class can handle edges and
 		  /// edge maps as well as arcs and arc maps.
 		  ///
 		  /// The columns in the \c \@edges (or \c \@arcs) section are the
 		  /// edge maps. However, if there are two maps with the same name
 		  /// prefixed with \c '+' and \c '-', then these can be read into an
 		  /// arc map.  Similarly, an attribute can be read into an arc, if
 		  /// it's value is an edge label prefixed with \c '+' or \c '-'.
 		  template <typename GR>
 		  class GraphReader {
 		  public:
 		    typedef GR Graph;
 		  private:
-		    TEMPLATE_GRAPH_TYPEDEFS(Graph);
+		    TEMPLATE_GRAPH_TYPEDEFS(GR);
 		    std::istream* _is;
 		    bool local_is;
 		    std::string _filename;
-		    Graph& _graph;
+		    GR& _graph;
 		    std::string _nodes_caption;
 		    std::string _edges_caption;
 		    std::string _attributes_caption;
 		    typedef std::map<std::string, Node> NodeIndex;
 		    NodeIndex _node_index;
 		    typedef std::map<std::string, Edge> EdgeIndex;
 		    EdgeIndex _edge_index;
 		    typedef std::vector<std::pair<std::string,
 		      _reader_bits::MapStorageBase<Node>*> > NodeMaps;
 		    NodeMaps _node_maps;
 		    typedef std::vector<std::pair<std::string,
 		      _reader_bits::MapStorageBase<Edge>*> > EdgeMaps;
 		    EdgeMaps _edge_maps;
 		    typedef std::multimap<std::string, _reader_bits::ValueStorageBase*>
 		      Attributes;
 		    Attributes _attributes;
 		    bool _use_nodes;
 		    bool _use_edges;
 		    bool _skip_nodes;
 		    bool _skip_edges;
 		    int line_num;
 		    std::istringstream line;
 		  public:
 		    /// \brief Constructor
 		    ///
 		    /// Construct an undirected graph reader, which reads from the given
 		    /// input stream.
-		    GraphReader(Graph& graph, std::istream& is = std::cin)
+		    GraphReader(GR& graph, std::istream& is = std::cin)
 		      : _is(&is), local_is(false), _graph(graph),
 		        _use_nodes(false), _use_edges(false),
 		        _skip_nodes(false), _skip_edges(false) {}
 		    /// \brief Constructor
 		    ///
 		    /// Construct an undirected graph reader, which reads from the given
 		    /// file.
-		    GraphReader(Graph& graph, const std::string& fn)
+		    GraphReader(GR& graph, const std::string& fn)
 		      : _is(new std::ifstream(fn.c_str())), local_is(true),
 		        _filename(fn), _graph(graph),
 		        _use_nodes(false), _use_edges(false),
 		        _skip_nodes(false), _skip_edges(false) {
 		      if (!(*_is)) {
 		        delete _is;
 		        throw IoError("Cannot open file", fn);
+		      }
+		    }
 		    /// \brief Constructor
 		    ///
 		    /// Construct an undirected graph reader, which reads from the given
 		    /// file.
-		    GraphReader(Graph& graph, const char* fn)
+		    GraphReader(GR& graph, const char* fn)
 		      : _is(new std::ifstream(fn)), local_is(true),
 		        _filename(fn), _graph(graph),
 		        _use_nodes(false), _use_edges(false),
 		        _skip_nodes(false), _skip_edges(false) {
 		      if (!(*_is)) {
 		        delete _is;
 		        throw IoError("Cannot open file", fn);
+		      }
+		    }
 		    /// \brief Destructor
 		    ~GraphReader() {
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        delete it->second;
+		      }
 		      for (typename EdgeMaps::iterator it = _edge_maps.begin();
 		           it != _edge_maps.end(); ++it) {
 		        delete it->second;
+		      }
 		      for (typename Attributes::iterator it = _attributes.begin();
 		           it != _attributes.end(); ++it) {
 		        delete it->second;
+		      }
 		      if (local_is) {
 		        delete _is;
+		      }
+		    }
 		  private:
 		    template <typename Graph>
 		    friend GraphReader<Graph> graphReader(Graph& graph, std::istream& is);
 		    template <typename Graph>
 		    friend GraphReader<Graph> graphReader(Graph& graph, const std::string& fn);
 		    template <typename Graph>
 		    friend GraphReader<Graph> graphReader(Graph& graph, const char *fn);
 		    template <typename TGR>
 		    friend GraphReader<TGR> graphReader(TGR& graph, std::istream& is);
 		    template <typename TGR>
 		    friend GraphReader<TGR> graphReader(TGR& graph, const std::string& fn);
 		    template <typename TGR>
 		    friend GraphReader<TGR> graphReader(TGR& graph, const char *fn);
 		    GraphReader(GraphReader& other)
 		      : _is(other._is), local_is(other.local_is), _graph(other._graph),
 		        _use_nodes(other._use_nodes), _use_edges(other._use_edges),
 		        _skip_nodes(other._skip_nodes), _skip_edges(other._skip_edges) {
 		      other._is = 0;
 		      other.local_is = false;
 		      _node_index.swap(other._node_index);
 		      _edge_index.swap(other._edge_index);
 		      _node_maps.swap(other._node_maps);
 		      _edge_maps.swap(other._edge_maps);
 		      _attributes.swap(other._attributes);
 		      _nodes_caption = other._nodes_caption;
 		      _edges_caption = other._edges_caption;
 		      _attributes_caption = other._attributes_caption;
+		    }
 		    GraphReader& operator=(const GraphReader&);
 		  public:
 		    /// \name Reading rules
 		    /// @{
 		    /// \brief Node map reading rule
 		    ///
 		    /// Add a node map reading rule to the reader.
 		    template <typename Map>
 		    GraphReader& nodeMap(const std::string& caption, Map& map) {
 		      checkConcept<concepts::WriteMap<Node, typename Map::Value>, Map>();
 		      _reader_bits::MapStorageBase<Node>* storage =
 		        new _reader_bits::MapStorage<Node, Map>(map);
 		      _node_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Node map reading rule
 		    ///
 		    /// Add a node map reading rule with specialized converter to the
 		    /// reader.
 		    template <typename Map, typename Converter>
 		    GraphReader& nodeMap(const std::string& caption, Map& map,
 		                           const Converter& converter = Converter()) {
 		      checkConcept<concepts::WriteMap<Node, typename Map::Value>, Map>();
 		      _reader_bits::MapStorageBase<Node>* storage =
 		        new _reader_bits::MapStorage<Node, Map, Converter>(map, converter);
 		      _node_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Edge map reading rule
 		    ///
 		    /// Add an edge map reading rule to the reader.
 		    template <typename Map>
 		    GraphReader& edgeMap(const std::string& caption, Map& map) {
 		      checkConcept<concepts::WriteMap<Edge, typename Map::Value>, Map>();
 		      _reader_bits::MapStorageBase<Edge>* storage =
 		        new _reader_bits::MapStorage<Edge, Map>(map);
 		      _edge_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Edge map reading rule
 		    ///
 		    /// Add an edge map reading rule with specialized converter to the
 		    /// reader.
 		    template <typename Map, typename Converter>
 		    GraphReader& edgeMap(const std::string& caption, Map& map,
 		                          const Converter& converter = Converter()) {
 		      checkConcept<concepts::WriteMap<Edge, typename Map::Value>, Map>();
 		      _reader_bits::MapStorageBase<Edge>* storage =
 		        new _reader_bits::MapStorage<Edge, Map, Converter>(map, converter);
 		      _edge_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Arc map reading rule
 		    ///
 		    /// Add an arc map reading rule to the reader.
 		    template <typename Map>
 		    GraphReader& arcMap(const std::string& caption, Map& map) {
 		      checkConcept<concepts::WriteMap<Arc, typename Map::Value>, Map>();
 		      _reader_bits::MapStorageBase<Edge>* forward_storage =
 		        new _reader_bits::GraphArcMapStorage<Graph, true, Map>(_graph, map);
 		      _edge_maps.push_back(std::make_pair('+' + caption, forward_storage));
 		      _reader_bits::MapStorageBase<Edge>* backward_storage =
-		        new _reader_bits::GraphArcMapStorage<Graph, false, Map>(_graph, map);
+		        new _reader_bits::GraphArcMapStorage<GR, false, Map>(_graph, map);
 		      _edge_maps.push_back(std::make_pair('-' + caption, backward_storage));
 		      return *this;
+		    }
 		    /// \brief Arc map reading rule
 		    ///
 		    /// Add an arc map reading rule with specialized converter to the
 		    /// reader.
 		    template <typename Map, typename Converter>
 		    GraphReader& arcMap(const std::string& caption, Map& map,
 		                          const Converter& converter = Converter()) {
 		      checkConcept<concepts::WriteMap<Arc, typename Map::Value>, Map>();
 		      _reader_bits::MapStorageBase<Edge>* forward_storage =
-		        new _reader_bits::GraphArcMapStorage<Graph, true, Map, Converter>
+		        new _reader_bits::GraphArcMapStorage<GR, true, Map, Converter>
 		        (_graph, map, converter);
 		      _edge_maps.push_back(std::make_pair('+' + caption, forward_storage));
 		      _reader_bits::MapStorageBase<Edge>* backward_storage =
-		        new _reader_bits::GraphArcMapStorage<Graph, false, Map, Converter>
+		        new _reader_bits::GraphArcMapStorage<GR, false, Map, Converter>
 		        (_graph, map, converter);
 		      _edge_maps.push_back(std::make_pair('-' + caption, backward_storage));
 		      return *this;
+		    }
 		    /// \brief Attribute reading rule
 		    ///
 		    /// Add an attribute reading rule to the reader.
 		    template <typename Value>
 		    GraphReader& attribute(const std::string& caption, Value& value) {
 		      _reader_bits::ValueStorageBase* storage =
 		        new _reader_bits::ValueStorage<Value>(value);
 		      _attributes.insert(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Attribute reading rule
 		    ///
 		    /// Add an attribute reading rule with specialized converter to the
 		    /// reader.
 		    template <typename Value, typename Converter>
 		    GraphReader& attribute(const std::string& caption, Value& value,
 		                             const Converter& converter = Converter()) {
 		      _reader_bits::ValueStorageBase* storage =
 		        new _reader_bits::ValueStorage<Value, Converter>(value, converter);
 		      _attributes.insert(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Node reading rule
 		    ///
 		    /// Add a node reading rule to reader.
 		    GraphReader& node(const std::string& caption, Node& node) {
 		      typedef _reader_bits::MapLookUpConverter<Node> Converter;
 		      Converter converter(_node_index);
 		      _reader_bits::ValueStorageBase* storage =
 		        new _reader_bits::ValueStorage<Node, Converter>(node, converter);
 		      _attributes.insert(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Edge reading rule
 		    ///
 		    /// Add an edge reading rule to reader.
 		    GraphReader& edge(const std::string& caption, Edge& edge) {
 		      typedef _reader_bits::MapLookUpConverter<Edge> Converter;
 		      Converter converter(_edge_index);
 		      _reader_bits::ValueStorageBase* storage =
 		        new _reader_bits::ValueStorage<Edge, Converter>(edge, converter);
 		      _attributes.insert(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Arc reading rule
 		    ///
 		    /// Add an arc reading rule to reader.
 		    GraphReader& arc(const std::string& caption, Arc& arc) {
-		      typedef _reader_bits::GraphArcLookUpConverter<Graph> Converter;
+		      typedef _reader_bits::GraphArcLookUpConverter<GR> Converter;
 		      Converter converter(_graph, _edge_index);
 		      _reader_bits::ValueStorageBase* storage =
 		        new _reader_bits::ValueStorage<Arc, Converter>(arc, converter);
 		      _attributes.insert(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// @}
 		    /// \name Select section by name
 		    /// @{
 		    /// \brief Set \c \@nodes section to be read
 		    ///
 		    /// Set \c \@nodes section to be read.
 		    GraphReader& nodes(const std::string& caption) {
 		      _nodes_caption = caption;
 		      return *this;
+		    }
 		    /// \brief Set \c \@edges section to be read
 		    ///
 		    /// Set \c \@edges section to be read.
 		    GraphReader& edges(const std::string& caption) {
 		      _edges_caption = caption;
 		      return *this;
+		    }
 		    /// \brief Set \c \@attributes section to be read
 		    ///
 		    /// Set \c \@attributes section to be read.
 		    GraphReader& attributes(const std::string& caption) {
 		      _attributes_caption = caption;
 		      return *this;
+		    }
 		    /// @}
 		    /// \name Using previously constructed node or edge set
 		    /// @{
 		    /// \brief Use previously constructed node set
 		    ///
 		    /// Use previously constructed node set, and specify the node
 		    /// label map.
 		    template <typename Map>
 		    GraphReader& useNodes(const Map& map) {
 		      checkConcept<concepts::ReadMap<Node, typename Map::Value>, Map>();
@@ -1988,123 +2014,148 @@
 		          if (line >> c)
 		            throw FormatError("Extra character at the end of line");
 		          if (section == "nodes" && !nodes_done) {
 		            if (_nodes_caption.empty() || _nodes_caption == caption) {
 		              readNodes();
 		              nodes_done = true;
+		            }
 		          } else if ((section == "edges" || section == "arcs") &&
 		                     !edges_done) {
 		            if (_edges_caption.empty() || _edges_caption == caption) {
 		              readEdges();
 		              edges_done = true;
+		            }
 		          } else if (section == "attributes" && !attributes_done) {
 		            if (_attributes_caption.empty() || _attributes_caption == caption) {
 		              readAttributes();
 		              attributes_done = true;
+		            }
 		          } else {
 		            readLine();
 		            skipSection();
+		          }
 		        } catch (FormatError& error) {
 		          error.line(line_num);
 		          error.file(_filename);
 		          throw;
+		        }
+		      }
 		      if (!nodes_done) {
 		        throw FormatError("Section @nodes not found");
+		      }
 		      if (!edges_done) {
 		        throw FormatError("Section @edges not found");
+		      }
 		      if (!attributes_done && !_attributes.empty()) {
 		        throw FormatError("Section @attributes not found");
+		      }
+		    }
 		    /// @}
 		  };
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief Return a \ref GraphReader class
 		  ///
 		  /// This function just returns a \ref GraphReader class.
 		  ///
 		  /// With this function a graph can be read from an
 		  /// \ref lgf-format "LGF" file or input stream with several maps and
 		  /// attributes. For example, there is weighted matching problem on a
 		  /// graph, i.e. a graph with a \e weight map on the edges. This
 		  /// graph can be read with the following code:
 		  ///
 		  ///\code
 		  ///ListGraph graph;
 		  ///ListGraph::EdgeMap<int> weight(graph);
 		  ///graphReader(graph, std::cin).
 		  ///  edgeMap("weight", weight).
 		  ///  run();
 		  ///\endcode
 		  ///
 		  /// For a complete documentation, please see the \ref GraphReader
 		  /// class documentation.
 		  /// \warning Don't forget to put the \ref GraphReader::run() "run()"
 		  /// to the end of the parameter list.
 		  /// \relates GraphReader
 		  /// \sa graphReader(TGR& graph, const std::string& fn)
 		  /// \sa graphReader(TGR& graph, const char* fn)
 		  template <typename TGR>
 		  GraphReader<TGR> graphReader(TGR& graph, std::istream& is) {
 		    GraphReader<TGR> tmp(graph, is);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref GraphReader class
 		  ///
 		  /// This function just returns a \ref GraphReader class.
 		  /// \relates GraphReader
 		  template <typename Graph>
 		  GraphReader<Graph> graphReader(Graph& graph, std::istream& is) {
-		    GraphReader<Graph> tmp(graph, is);
+		  /// \sa graphReader(TGR& graph, std::istream& is)
 		  template <typename TGR>
 		  GraphReader<TGR> graphReader(TGR& graph, const std::string& fn) {
 		    GraphReader<TGR> tmp(graph, fn);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref GraphReader class
 		  ///
 		  /// This function just returns a \ref GraphReader class.
 		  /// \relates GraphReader
 		  template <typename Graph>
 		  GraphReader<Graph> graphReader(Graph& graph, const std::string& fn) {
 		    GraphReader<Graph> tmp(graph, fn);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref GraphReader class
 		  ///
 		  /// This function just returns a \ref GraphReader class.
 		  /// \relates GraphReader
 		  template <typename Graph>
 		  GraphReader<Graph> graphReader(Graph& graph, const char* fn) {
-		    GraphReader<Graph> tmp(graph, fn);
+		  /// \sa graphReader(TGR& graph, std::istream& is)
 		  template <typename TGR>
 		  GraphReader<TGR> graphReader(TGR& graph, const char* fn) {
 		    GraphReader<TGR> tmp(graph, fn);
 		    return tmp;
+		  }
 		  class SectionReader;
 		  SectionReader sectionReader(std::istream& is);
 		  SectionReader sectionReader(const std::string& fn);
 		  SectionReader sectionReader(const char* fn);
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief Section reader class
 		  ///
 		  /// In the \ref lgf-format "LGF" file extra sections can be placed,
 		  /// which contain any data in arbitrary format. Such sections can be
 		  /// read with this class. A reading rule can be added to the class
 		  /// with two different functions. With the \c sectionLines() function a
 		  /// functor can process the section line-by-line, while with the \c
 		  /// sectionStream() member the section can be read from an input
 		  /// stream.
 		  class SectionReader {
 		  private:
 		    std::istream* _is;
 		    bool local_is;
 		    std::string _filename;
 		    typedef std::map<std::string, _reader_bits::Section*> Sections;
 		    Sections _sections;
 		    int line_num;
 		    std::istringstream line;
 		  public:
 		    /// \brief Constructor
 		    ///
 		    /// Construct a section reader, which reads from the given input
 		    /// stream.
 		    SectionReader(std::istream& is)
 		      : _is(&is), local_is(false) {}
 		    /// \brief Constructor
 		    ///
 		    /// Construct a section reader, which reads from the given file.
 		    SectionReader(const std::string& fn)
 		      : _is(new std::ifstream(fn.c_str())), local_is(true),
 		        _filename(fn) {
@@ -2271,118 +2322,128 @@
 		      line_num = 0;
 		      readLine();
 		      skipSection();
 		      while (readSuccess()) {
 		        try {
 		          char c;
 		          std::string section, caption;
 		          line >> c;
 		          _reader_bits::readToken(line, section);
 		          _reader_bits::readToken(line, caption);
 		          if (line >> c)
 		            throw FormatError("Extra character at the end of line");
 		          if (extra_sections.find(section) != extra_sections.end()) {
 		            std::ostringstream msg;
 		            msg << "Multiple occurence of section: " << section;
 		            throw FormatError(msg.str());
+		          }
 		          Sections::iterator it = _sections.find(section);
 		          if (it != _sections.end()) {
 		            extra_sections.insert(section);
 		            it->second->process(*_is, line_num);
+		          }
 		          readLine();
 		          skipSection();
 		        } catch (FormatError& error) {
 		          error.line(line_num);
 		          error.file(_filename);
 		          throw;
+		        }
+		      }
 		      for (Sections::iterator it = _sections.begin();
 		           it != _sections.end(); ++it) {
 		        if (extra_sections.find(it->first) == extra_sections.end()) {
 		          std::ostringstream os;
 		          os << "Cannot find section: " << it->first;
 		          throw FormatError(os.str());
+		        }
+		      }
+		    }
 		    /// @}
 		  };
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief Return a \ref SectionReader class
 		  ///
 		  /// This function just returns a \ref SectionReader class.
 		  ///
 		  /// Please see SectionReader documentation about the custom section
 		  /// input.
 		  ///
 		  /// \relates SectionReader
 		  /// \sa sectionReader(const std::string& fn)
 		  /// \sa sectionReader(const char *fn)
 		  inline SectionReader sectionReader(std::istream& is) {
 		    SectionReader tmp(is);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref SectionReader class
 		  ///
 		  /// This function just returns a \ref SectionReader class.
 		  /// \relates SectionReader
 		  inline SectionReader sectionReader(std::istream& is) {
 		    SectionReader tmp(is);
 		  /// \sa sectionReader(std::istream& is)
 		  inline SectionReader sectionReader(const std::string& fn) {
 		    SectionReader tmp(fn);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref SectionReader class
 		  ///
 		  /// This function just returns a \ref SectionReader class.
 		  /// \relates SectionReader
 		  inline SectionReader sectionReader(const std::string& fn) {
 		    SectionReader tmp(fn);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref SectionReader class
 		  ///
 		  /// This function just returns a \ref SectionReader class.
-		  /// \relates SectionReader
+		  /// \sa sectionReader(std::istream& is)
 		  inline SectionReader sectionReader(const char* fn) {
 		    SectionReader tmp(fn);
 		    return tmp;
+		  }
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief Reader for the contents of the \ref lgf-format "LGF" file
 		  ///
 		  /// This class can be used to read the sections, the map names and
 		  /// the attributes from a file. Usually, the LEMON programs know
 		  /// that, which type of graph, which maps and which attributes
 		  /// should be read from a file, but in general tools (like glemon)
 		  /// the contents of an LGF file should be guessed somehow. This class
 		  /// reads the graph and stores the appropriate information for
 		  /// reading the graph.
 		  ///
 		  ///\code
 		  /// LgfContents contents("graph.lgf");
 		  /// contents.run();
 		  ///
 		  /// // Does it contain any node section and arc section?
 		  /// if (contents.nodeSectionNum() == 0 || contents.arcSectionNum()) {
 		  ///   std::cerr << "Failure, cannot find graph." << std::endl;
 		  ///   return -1;
 		  /// }
 		  /// std::cout << "The name of the default node section: "
 		  ///           << contents.nodeSection(0) << std::endl;
 		  /// std::cout << "The number of the arc maps: "
 		  ///           << contents.arcMaps(0).size() << std::endl;
 		  /// std::cout << "The name of second arc map: "
 		  ///           << contents.arcMaps(0)[1] << std::endl;
 		  ///\endcode
 		  class LgfContents {
 		  private:
 		    std::istream* _is;
 		    bool local_is;
 		    std::vector<std::string> _node_sections;
 		    std::vector<std::string> _edge_sections;
 		    std::vector<std::string> _attribute_sections;
 		    std::vector<std::string> _extra_sections;
 		    std::vector<bool> _arc_sections;
 		    std::vector<std::vector<std::string> > _node_maps;
 		    std::vector<std::vector<std::string> > _edge_maps;

lemon/lgf_writer.h

Show inline comments

@@ -302,263 +302,261 @@
 		        os << '\"';
 		      } else {
 		        os << str;
+		      }
 		      return os;
+		    }
 		    class Section {
 		    public:
 		      virtual ~Section() {}
 		      virtual void process(std::ostream& os) = 0;
 		    };
 		    template <typename Functor>
 		    class LineSection : public Section {
 		    private:
 		      Functor _functor;
 		    public:
 		      LineSection(const Functor& functor) : _functor(functor) {}
 		      virtual ~LineSection() {}
 		      virtual void process(std::ostream& os) {
 		        std::string line;
 		        while (!(line = _functor()).empty()) os << line << std::endl;
+		      }
 		    };
 		    template <typename Functor>
 		    class StreamSection : public Section {
 		    private:
 		      Functor _functor;
 		    public:
 		      StreamSection(const Functor& functor) : _functor(functor) {}
 		      virtual ~StreamSection() {}
 		      virtual void process(std::ostream& os) {
 		        _functor(os);
+		      }
 		    };
+		  }
-		  template <typename Digraph>
+		  template <typename DGR>
 		  class DigraphWriter;
 		  template <typename Digraph>
 		  DigraphWriter<Digraph> digraphWriter(const Digraph& digraph,
 		                                       std::ostream& os = std::cout);
 		  template <typename Digraph>
 		  DigraphWriter<Digraph> digraphWriter(const Digraph& digraph,
 		                                       const std::string& fn);
 		  template <typename TDGR>
 		  DigraphWriter<TDGR> digraphWriter(const TDGR& digraph,
 		                                   std::ostream& os = std::cout);
 		  template <typename TDGR>
 		  DigraphWriter<TDGR> digraphWriter(const TDGR& digraph, const std::string& fn);
 		  template <typename Digraph>
 		  DigraphWriter<Digraph> digraphWriter(const Digraph& digraph,
-		                                       const char* fn);
+		  template <typename TDGR>
 		  DigraphWriter<TDGR> digraphWriter(const TDGR& digraph, const char* fn);
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief \ref lgf-format "LGF" writer for directed graphs
 		  ///
 		  /// This utility writes an \ref lgf-format "LGF" file.
 		  ///
 		  /// The writing method does a batch processing. The user creates a
 		  /// writer object, then various writing rules can be added to the
 		  /// writer, and eventually the writing is executed with the \c run()
 		  /// member function. A map writing rule can be added to the writer
 		  /// with the \c nodeMap() or \c arcMap() members. An optional
 		  /// converter parameter can also be added as a standard functor
 		  /// converting from the value type of the map to \c std::string. If it
 		  /// is set, it will determine how the value type of the map is written to
 		  /// the output stream. If the functor is not set, then a default
 		  /// conversion will be used. The \c attribute(), \c node() and \c
 		  /// arc() functions are used to add attribute writing rules.
 		  ///
 		  ///\code
-		  /// DigraphWriter<Digraph>(digraph, std::cout).
+		  /// DigraphWriter<DGR>(digraph, std::cout).
 		  ///   nodeMap("coordinates", coord_map).
 		  ///   nodeMap("size", size).
 		  ///   nodeMap("title", title).
 		  ///   arcMap("capacity", cap_map).
 		  ///   node("source", src).
 		  ///   node("target", trg).
 		  ///   attribute("caption", caption).
 		  ///   run();
 		  ///\endcode
 		  ///
 		  ///
 		  /// By default, the writer does not write additional captions to the
 		  /// sections, but they can be give as an optional parameter of
 		  /// the \c nodes(), \c arcs() or \c
 		  /// attributes() functions.
 		  ///
 		  /// The \c skipNodes() and \c skipArcs() functions forbid the
 		  /// writing of the sections. If two arc sections should be written
 		  /// to the output, it can be done in two passes, the first pass
 		  /// writes the node section and the first arc section, then the
 		  /// second pass skips the node section and writes just the arc
 		  /// section to the stream. The output stream can be retrieved with
 		  /// the \c ostream() function, hence the second pass can append its
 		  /// output to the output of the first pass.
-		  template <typename GR>
+		  template <typename DGR>
 		  class DigraphWriter {
 		  public:
 		    typedef GR Digraph;
 		    TEMPLATE_DIGRAPH_TYPEDEFS(Digraph);
 		    typedef DGR Digraph;
 		    TEMPLATE_DIGRAPH_TYPEDEFS(DGR);
 		  private:
 		    std::ostream* _os;
 		    bool local_os;
-		    const Digraph& _digraph;
+		    const DGR& _digraph;
 		    std::string _nodes_caption;
 		    std::string _arcs_caption;
 		    std::string _attributes_caption;
 		    typedef std::map<Node, std::string> NodeIndex;
 		    NodeIndex _node_index;
 		    typedef std::map<Arc, std::string> ArcIndex;
 		    ArcIndex _arc_index;
 		    typedef std::vector<std::pair<std::string,
 		      _writer_bits::MapStorageBase<Node>* > > NodeMaps;
 		    NodeMaps _node_maps;
 		    typedef std::vector<std::pair<std::string,
 		      _writer_bits::MapStorageBase<Arc>* > >ArcMaps;
 		    ArcMaps _arc_maps;
 		    typedef std::vector<std::pair<std::string,
 		      _writer_bits::ValueStorageBase*> > Attributes;
 		    Attributes _attributes;
 		    bool _skip_nodes;
 		    bool _skip_arcs;
 		  public:
 		    /// \brief Constructor
 		    ///
 		    /// Construct a directed graph writer, which writes to the given
 		    /// output stream.
-		    DigraphWriter(const Digraph& digraph, std::ostream& os = std::cout)
+		    DigraphWriter(const DGR& digraph, std::ostream& os = std::cout)
 		      : _os(&os), local_os(false), _digraph(digraph),
 		        _skip_nodes(false), _skip_arcs(false) {}
 		    /// \brief Constructor
 		    ///
 		    /// Construct a directed graph writer, which writes to the given
 		    /// output file.
-		    DigraphWriter(const Digraph& digraph, const std::string& fn)
+		    DigraphWriter(const DGR& digraph, const std::string& fn)
 		      : _os(new std::ofstream(fn.c_str())), local_os(true), _digraph(digraph),
 		        _skip_nodes(false), _skip_arcs(false) {
 		      if (!(*_os)) {
 		        delete _os;
 		        throw IoError("Cannot write file", fn);
+		      }
+		    }
 		    /// \brief Constructor
 		    ///
 		    /// Construct a directed graph writer, which writes to the given
 		    /// output file.
-		    DigraphWriter(const Digraph& digraph, const char* fn)
+		    DigraphWriter(const DGR& digraph, const char* fn)
 		      : _os(new std::ofstream(fn)), local_os(true), _digraph(digraph),
 		        _skip_nodes(false), _skip_arcs(false) {
 		      if (!(*_os)) {
 		        delete _os;
 		        throw IoError("Cannot write file", fn);
+		      }
+		    }
 		    /// \brief Destructor
 		    ~DigraphWriter() {
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        delete it->second;
+		      }
 		      for (typename ArcMaps::iterator it = _arc_maps.begin();
 		           it != _arc_maps.end(); ++it) {
 		        delete it->second;
+		      }
 		      for (typename Attributes::iterator it = _attributes.begin();
 		           it != _attributes.end(); ++it) {
 		        delete it->second;
+		      }
 		      if (local_os) {
 		        delete _os;
+		      }
+		    }
 		  private:
 		    template <typename DGR>
 		    friend DigraphWriter<DGR> digraphWriter(const DGR& digraph,
 		                                            std::ostream& os);
 		    template <typename DGR>
 		    friend DigraphWriter<DGR> digraphWriter(const DGR& digraph,
 		                                            const std::string& fn);
 		    template <typename DGR>
 		    friend DigraphWriter<DGR> digraphWriter(const DGR& digraph,
-		                                            const char *fn);
+		    template <typename TDGR>
 		    friend DigraphWriter<TDGR> digraphWriter(const TDGR& digraph,
 		                                             std::ostream& os);
 		    template <typename TDGR>
 		    friend DigraphWriter<TDGR> digraphWriter(const TDGR& digraph,
 		                                             const std::string& fn);
 		    template <typename TDGR>
 		    friend DigraphWriter<TDGR> digraphWriter(const TDGR& digraph,
 		                                             const char *fn);
 		    DigraphWriter(DigraphWriter& other)
 		      : _os(other._os), local_os(other.local_os), _digraph(other._digraph),
 		        _skip_nodes(other._skip_nodes), _skip_arcs(other._skip_arcs) {
 		      other._os = 0;
 		      other.local_os = false;
 		      _node_index.swap(other._node_index);
 		      _arc_index.swap(other._arc_index);
 		      _node_maps.swap(other._node_maps);
 		      _arc_maps.swap(other._arc_maps);
 		      _attributes.swap(other._attributes);
 		      _nodes_caption = other._nodes_caption;
 		      _arcs_caption = other._arcs_caption;
 		      _attributes_caption = other._attributes_caption;
+		    }
 		    DigraphWriter& operator=(const DigraphWriter&);
 		  public:
 		    /// \name Writing rules
 		    /// @{
 		    /// \brief Node map writing rule
 		    ///
 		    /// Add a node map writing rule to the writer.
 		    template <typename Map>
 		    DigraphWriter& nodeMap(const std::string& caption, const Map& map) {
 		      checkConcept<concepts::ReadMap<Node, typename Map::Value>, Map>();
 		      _writer_bits::MapStorageBase<Node>* storage =
 		        new _writer_bits::MapStorage<Node, Map>(map);
 		      _node_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Node map writing rule
 		    ///
 		    /// Add a node map writing rule with specialized converter to the
 		    /// writer.
 		    template <typename Map, typename Converter>
 		    DigraphWriter& nodeMap(const std::string& caption, const Map& map,
 		                           const Converter& converter = Converter()) {
 		      checkConcept<concepts::ReadMap<Node, typename Map::Value>, Map>();
 		      _writer_bits::MapStorageBase<Node>* storage =
@@ -679,183 +677,183 @@
 		      _skip_nodes = true;
 		      return *this;
+		    }
 		    /// \brief Skip writing arc set
 		    ///
 		    /// The \c \@arcs section will not be written to the stream.
 		    DigraphWriter& skipArcs() {
 		      LEMON_ASSERT(!_skip_arcs, "Multiple usage of skipArcs() member");
 		      _skip_arcs = true;
 		      return *this;
+		    }
 		    /// @}
 		  private:
 		    void writeNodes() {
 		      _writer_bits::MapStorageBase<Node>* label = 0;
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        if (it->first == "label") {
 		          label = it->second;
 		          break;
+		        }
+		      }
 		      *_os << "@nodes";
 		      if (!_nodes_caption.empty()) {
 		        _writer_bits::writeToken(*_os << ' ', _nodes_caption);
+		      }
 		      *_os << std::endl;
 		      if (label == 0) {
 		        *_os << "label" << '\t';
+		      }
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        _writer_bits::writeToken(*_os, it->first) << '\t';
+		      }
 		      *_os << std::endl;
 		      std::vector<Node> nodes;
 		      for (NodeIt n(_digraph); n != INVALID; ++n) {
 		        nodes.push_back(n);
+		      }
 		      if (label == 0) {
 		        IdMap<Digraph, Node> id_map(_digraph);
 		        _writer_bits::MapLess<IdMap<Digraph, Node> > id_less(id_map);
 		        IdMap<DGR, Node> id_map(_digraph);
 		        _writer_bits::MapLess<IdMap<DGR, Node> > id_less(id_map);
 		        std::sort(nodes.begin(), nodes.end(), id_less);
 		      } else {
 		        label->sort(nodes);
+		      }
 		      for (int i = 0; i < static_cast<int>(nodes.size()); ++i) {
 		        Node n = nodes[i];
 		        if (label == 0) {
 		          std::ostringstream os;
 		          os << _digraph.id(n);
 		          _writer_bits::writeToken(*_os, os.str());
 		          *_os << '\t';
 		          _node_index.insert(std::make_pair(n, os.str()));
+		        }
 		        for (typename NodeMaps::iterator it = _node_maps.begin();
 		             it != _node_maps.end(); ++it) {
 		          std::string value = it->second->get(n);
 		          _writer_bits::writeToken(*_os, value);
 		          if (it->first == "label") {
 		            _node_index.insert(std::make_pair(n, value));
+		          }
 		          *_os << '\t';
+		        }
 		        *_os << std::endl;
+		      }
+		    }
 		    void createNodeIndex() {
 		      _writer_bits::MapStorageBase<Node>* label = 0;
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        if (it->first == "label") {
 		          label = it->second;
 		          break;
+		        }
+		      }
 		      if (label == 0) {
 		        for (NodeIt n(_digraph); n != INVALID; ++n) {
 		          std::ostringstream os;
 		          os << _digraph.id(n);
 		          _node_index.insert(std::make_pair(n, os.str()));
+		        }
 		      } else {
 		        for (NodeIt n(_digraph); n != INVALID; ++n) {
 		          std::string value = label->get(n);
 		          _node_index.insert(std::make_pair(n, value));
+		        }
+		      }
+		    }
 		    void writeArcs() {
 		      _writer_bits::MapStorageBase<Arc>* label = 0;
 		      for (typename ArcMaps::iterator it = _arc_maps.begin();
 		           it != _arc_maps.end(); ++it) {
 		        if (it->first == "label") {
 		          label = it->second;
 		          break;
+		        }
+		      }
 		      *_os << "@arcs";
 		      if (!_arcs_caption.empty()) {
 		        _writer_bits::writeToken(*_os << ' ', _arcs_caption);
+		      }
 		      *_os << std::endl;
 		      *_os << '\t' << '\t';
 		      if (label == 0) {
 		        *_os << "label" << '\t';
+		      }
 		      for (typename ArcMaps::iterator it = _arc_maps.begin();
 		           it != _arc_maps.end(); ++it) {
 		        _writer_bits::writeToken(*_os, it->first) << '\t';
+		      }
 		      *_os << std::endl;
 		      std::vector<Arc> arcs;
 		      for (ArcIt n(_digraph); n != INVALID; ++n) {
 		        arcs.push_back(n);
+		      }
 		      if (label == 0) {
 		        IdMap<Digraph, Arc> id_map(_digraph);
 		        _writer_bits::MapLess<IdMap<Digraph, Arc> > id_less(id_map);
 		        IdMap<DGR, Arc> id_map(_digraph);
 		        _writer_bits::MapLess<IdMap<DGR, Arc> > id_less(id_map);
 		        std::sort(arcs.begin(), arcs.end(), id_less);
 		      } else {
 		        label->sort(arcs);
+		      }
 		      for (int i = 0; i < static_cast<int>(arcs.size()); ++i) {
 		        Arc a = arcs[i];
 		        _writer_bits::writeToken(*_os, _node_index.
 		                                 find(_digraph.source(a))->second);
 		        *_os << '\t';
 		        _writer_bits::writeToken(*_os, _node_index.
 		                                 find(_digraph.target(a))->second);
 		        *_os << '\t';
 		        if (label == 0) {
 		          std::ostringstream os;
 		          os << _digraph.id(a);
 		          _writer_bits::writeToken(*_os, os.str());
 		          *_os << '\t';
 		          _arc_index.insert(std::make_pair(a, os.str()));
+		        }
 		        for (typename ArcMaps::iterator it = _arc_maps.begin();
 		             it != _arc_maps.end(); ++it) {
 		          std::string value = it->second->get(a);
 		          _writer_bits::writeToken(*_os, value);
 		          if (it->first == "label") {
 		            _arc_index.insert(std::make_pair(a, value));
+		          }
 		          *_os << '\t';
+		        }
 		        *_os << std::endl;
+		      }
+		    }
 		    void createArcIndex() {
 		      _writer_bits::MapStorageBase<Arc>* label = 0;
 		      for (typename ArcMaps::iterator it = _arc_maps.begin();
 		           it != _arc_maps.end(); ++it) {
 		        if (it->first == "label") {
 		          label = it->second;
 		          break;
+		        }
+		      }
 		      if (label == 0) {
 		        for (ArcIt a(_digraph); a != INVALID; ++a) {
 		          std::ostringstream os;
 		          os << _digraph.id(a);
 		          _arc_index.insert(std::make_pair(a, os.str()));
@@ -870,606 +868,631 @@
 		    void writeAttributes() {
 		      if (_attributes.empty()) return;
 		      *_os << "@attributes";
 		      if (!_attributes_caption.empty()) {
 		        _writer_bits::writeToken(*_os << ' ', _attributes_caption);
+		      }
 		      *_os << std::endl;
 		      for (typename Attributes::iterator it = _attributes.begin();
 		           it != _attributes.end(); ++it) {
 		        _writer_bits::writeToken(*_os, it->first) << ' ';
 		        _writer_bits::writeToken(*_os, it->second->get());
 		        *_os << std::endl;
+		      }
+		    }
 		  public:
 		    /// \name Execution of the writer
 		    /// @{
 		    /// \brief Start the batch processing
 		    ///
 		    /// This function starts the batch processing.
 		    void run() {
 		      if (!_skip_nodes) {
 		        writeNodes();
 		      } else {
 		        createNodeIndex();
+		      }
 		      if (!_skip_arcs) {
 		        writeArcs();
 		      } else {
 		        createArcIndex();
+		      }
 		      writeAttributes();
+		    }
 		    /// \brief Give back the stream of the writer
 		    ///
 		    /// Give back the stream of the writer.
 		    std::ostream& ostream() {
 		      return *_os;
+		    }
 		    /// @}
 		  };
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief Return a \ref DigraphWriter class
 		  ///
 		  /// This function just returns a \ref DigraphWriter class.
+		  /// This function just returns a \ref DigraphWriter class.
 		  ///
 		  /// With this function a digraph can be write to a file or output
 		  /// stream in \ref lgf-format "LGF" format with several maps and
 		  /// attributes. For example, with the following code a network flow
 		  /// problem can be written to the standard output, i.e. a digraph
 		  /// with a \e capacity map on the arcs and \e source and \e target
 		  /// nodes:
 		  ///
 		  ///\code
 		  ///ListDigraph digraph;
 		  ///ListDigraph::ArcMap<int> cap(digraph);
 		  ///ListDigraph::Node src, trg;
 		  ///  // Setting the capacity map and source and target nodes
 		  ///digraphWriter(digraph, std::cout).
 		  ///  arcMap("capacity", cap).
 		  ///  node("source", src).
 		  ///  node("target", trg).
 		  ///  run();
 		  ///\endcode
 		  ///
 		  /// For a complete documentation, please see the \ref DigraphWriter
 		  /// class documentation.
 		  /// \warning Don't forget to put the \ref DigraphWriter::run() "run()"
 		  /// to the end of the parameter list.
 		  /// \relates DigraphWriter
 		  template <typename Digraph>
 		  DigraphWriter<Digraph> digraphWriter(const Digraph& digraph,
 		                                       std::ostream& os) {
 		    DigraphWriter<Digraph> tmp(digraph, os);
 		  /// \sa digraphWriter(const TDGR& digraph, const std::string& fn)
 		  /// \sa digraphWriter(const TDGR& digraph, const char* fn)
 		  template <typename TDGR>
 		  DigraphWriter<TDGR> digraphWriter(const TDGR& digraph, std::ostream& os) {
 		    DigraphWriter<TDGR> tmp(digraph, os);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref DigraphWriter class
 		  ///
 		  /// This function just returns a \ref DigraphWriter class.
 		  /// \relates DigraphWriter
 		  template <typename Digraph>
 		  DigraphWriter<Digraph> digraphWriter(const Digraph& digraph,
 		                                       const std::string& fn) {
 		    DigraphWriter<Digraph> tmp(digraph, fn);
 		  /// \sa digraphWriter(const TDGR& digraph, std::ostream& os)
 		  template <typename TDGR>
 		  DigraphWriter<TDGR> digraphWriter(const TDGR& digraph,
 		                                    const std::string& fn) {
 		    DigraphWriter<TDGR> tmp(digraph, fn);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref DigraphWriter class
 		  ///
 		  /// This function just returns a \ref DigraphWriter class.
 		  /// \relates DigraphWriter
 		  template <typename Digraph>
 		  DigraphWriter<Digraph> digraphWriter(const Digraph& digraph,
 		                                       const char* fn) {
 		    DigraphWriter<Digraph> tmp(digraph, fn);
 		  /// \sa digraphWriter(const TDGR& digraph, std::ostream& os)
 		  template <typename TDGR>
 		  DigraphWriter<TDGR> digraphWriter(const TDGR& digraph, const char* fn) {
 		    DigraphWriter<TDGR> tmp(digraph, fn);
 		    return tmp;
+		  }
-		  template <typename Graph>
+		  template <typename GR>
 		  class GraphWriter;
 		  template <typename Graph>
 		  GraphWriter<Graph> graphWriter(const Graph& graph,
 		                                 std::ostream& os = std::cout);
 		  template <typename Graph>
 		  GraphWriter<Graph> graphWriter(const Graph& graph, const std::string& fn);
 		  template <typename Graph>
-		  GraphWriter<Graph> graphWriter(const Graph& graph, const char* fn);
+		  template <typename TGR>
 		  GraphWriter<TGR> graphWriter(const TGR& graph, std::ostream& os = std::cout);
 		  template <typename TGR>
 		  GraphWriter<TGR> graphWriter(const TGR& graph, const std::string& fn);
 		  template <typename TGR>
 		  GraphWriter<TGR> graphWriter(const TGR& graph, const char* fn);
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief \ref lgf-format "LGF" writer for directed graphs
 		  ///
 		  /// This utility writes an \ref lgf-format "LGF" file.
 		  ///
 		  /// It can be used almost the same way as \c DigraphWriter.
 		  /// The only difference is that this class can handle edges and
 		  /// edge maps as well as arcs and arc maps.
 		  ///
 		  /// The arc maps are written into the file as two columns, the
 		  /// caption of the columns are the name of the map prefixed with \c
 		  /// '+' and \c '-'. The arcs are written into the \c \@attributes
 		  /// section as a \c '+' or a \c '-' prefix (depends on the direction
 		  /// of the arc) and the label of corresponding edge.
 		  template <typename GR>
 		  class GraphWriter {
 		  public:
 		    typedef GR Graph;
-		    TEMPLATE_GRAPH_TYPEDEFS(Graph);
+		    TEMPLATE_GRAPH_TYPEDEFS(GR);
 		  private:
 		    std::ostream* _os;
 		    bool local_os;
-		    const Graph& _graph;
+		    const GR& _graph;
 		    std::string _nodes_caption;
 		    std::string _edges_caption;
 		    std::string _attributes_caption;
 		    typedef std::map<Node, std::string> NodeIndex;
 		    NodeIndex _node_index;
 		    typedef std::map<Edge, std::string> EdgeIndex;
 		    EdgeIndex _edge_index;
 		    typedef std::vector<std::pair<std::string,
 		      _writer_bits::MapStorageBase<Node>* > > NodeMaps;
 		    NodeMaps _node_maps;
 		    typedef std::vector<std::pair<std::string,
 		      _writer_bits::MapStorageBase<Edge>* > >EdgeMaps;
 		    EdgeMaps _edge_maps;
 		    typedef std::vector<std::pair<std::string,
 		      _writer_bits::ValueStorageBase*> > Attributes;
 		    Attributes _attributes;
 		    bool _skip_nodes;
 		    bool _skip_edges;
 		  public:
 		    /// \brief Constructor
 		    ///
 		    /// Construct a directed graph writer, which writes to the given
 		    /// output stream.
-		    GraphWriter(const Graph& graph, std::ostream& os = std::cout)
+		    GraphWriter(const GR& graph, std::ostream& os = std::cout)
 		      : _os(&os), local_os(false), _graph(graph),
 		        _skip_nodes(false), _skip_edges(false) {}
 		    /// \brief Constructor
 		    ///
 		    /// Construct a directed graph writer, which writes to the given
 		    /// output file.
-		    GraphWriter(const Graph& graph, const std::string& fn)
+		    GraphWriter(const GR& graph, const std::string& fn)
 		      : _os(new std::ofstream(fn.c_str())), local_os(true), _graph(graph),
 		        _skip_nodes(false), _skip_edges(false) {
 		      if (!(*_os)) {
 		        delete _os;
 		        throw IoError("Cannot write file", fn);
+		      }
+		    }
 		    /// \brief Constructor
 		    ///
 		    /// Construct a directed graph writer, which writes to the given
 		    /// output file.
-		    GraphWriter(const Graph& graph, const char* fn)
+		    GraphWriter(const GR& graph, const char* fn)
 		      : _os(new std::ofstream(fn)), local_os(true), _graph(graph),
 		        _skip_nodes(false), _skip_edges(false) {
 		      if (!(*_os)) {
 		        delete _os;
 		        throw IoError("Cannot write file", fn);
+		      }
+		    }
 		    /// \brief Destructor
 		    ~GraphWriter() {
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        delete it->second;
+		      }
 		      for (typename EdgeMaps::iterator it = _edge_maps.begin();
 		           it != _edge_maps.end(); ++it) {
 		        delete it->second;
+		      }
 		      for (typename Attributes::iterator it = _attributes.begin();
 		           it != _attributes.end(); ++it) {
 		        delete it->second;
+		      }
 		      if (local_os) {
 		        delete _os;
+		      }
+		    }
 		  private:
 		    template <typename Graph>
 		    friend GraphWriter<Graph> graphWriter(const Graph& graph,
 		                                          std::ostream& os);
 		    template <typename Graph>
 		    friend GraphWriter<Graph> graphWriter(const Graph& graph,
 		                                          const std::string& fn);
 		    template <typename Graph>
 		    friend GraphWriter<Graph> graphWriter(const Graph& graph,
-		                                          const char *fn);
+		    template <typename TGR>
 		    friend GraphWriter<TGR> graphWriter(const TGR& graph, std::ostream& os);
 		    template <typename TGR>
 		    friend GraphWriter<TGR> graphWriter(const TGR& graph,
 		                                        const std::string& fn);
 		    template <typename TGR>
 		    friend GraphWriter<TGR> graphWriter(const TGR& graph, const char *fn);
 		    GraphWriter(GraphWriter& other)
 		      : _os(other._os), local_os(other.local_os), _graph(other._graph),
 		        _skip_nodes(other._skip_nodes), _skip_edges(other._skip_edges) {
 		      other._os = 0;
 		      other.local_os = false;
 		      _node_index.swap(other._node_index);
 		      _edge_index.swap(other._edge_index);
 		      _node_maps.swap(other._node_maps);
 		      _edge_maps.swap(other._edge_maps);
 		      _attributes.swap(other._attributes);
 		      _nodes_caption = other._nodes_caption;
 		      _edges_caption = other._edges_caption;
 		      _attributes_caption = other._attributes_caption;
+		    }
 		    GraphWriter& operator=(const GraphWriter&);
 		  public:
 		    /// \name Writing rules
 		    /// @{
 		    /// \brief Node map writing rule
 		    ///
 		    /// Add a node map writing rule to the writer.
 		    template <typename Map>
 		    GraphWriter& nodeMap(const std::string& caption, const Map& map) {
 		      checkConcept<concepts::ReadMap<Node, typename Map::Value>, Map>();
 		      _writer_bits::MapStorageBase<Node>* storage =
 		        new _writer_bits::MapStorage<Node, Map>(map);
 		      _node_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Node map writing rule
 		    ///
 		    /// Add a node map writing rule with specialized converter to the
 		    /// writer.
 		    template <typename Map, typename Converter>
 		    GraphWriter& nodeMap(const std::string& caption, const Map& map,
 		                           const Converter& converter = Converter()) {
 		      checkConcept<concepts::ReadMap<Node, typename Map::Value>, Map>();
 		      _writer_bits::MapStorageBase<Node>* storage =
 		        new _writer_bits::MapStorage<Node, Map, Converter>(map, converter);
 		      _node_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Edge map writing rule
 		    ///
 		    /// Add an edge map writing rule to the writer.
 		    template <typename Map>
 		    GraphWriter& edgeMap(const std::string& caption, const Map& map) {
 		      checkConcept<concepts::ReadMap<Edge, typename Map::Value>, Map>();
 		      _writer_bits::MapStorageBase<Edge>* storage =
 		        new _writer_bits::MapStorage<Edge, Map>(map);
 		      _edge_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Edge map writing rule
 		    ///
 		    /// Add an edge map writing rule with specialized converter to the
 		    /// writer.
 		    template <typename Map, typename Converter>
 		    GraphWriter& edgeMap(const std::string& caption, const Map& map,
 		                          const Converter& converter = Converter()) {
 		      checkConcept<concepts::ReadMap<Edge, typename Map::Value>, Map>();
 		      _writer_bits::MapStorageBase<Edge>* storage =
 		        new _writer_bits::MapStorage<Edge, Map, Converter>(map, converter);
 		      _edge_maps.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Arc map writing rule
 		    ///
 		    /// Add an arc map writing rule to the writer.
 		    template <typename Map>
 		    GraphWriter& arcMap(const std::string& caption, const Map& map) {
 		      checkConcept<concepts::ReadMap<Arc, typename Map::Value>, Map>();
 		      _writer_bits::MapStorageBase<Edge>* forward_storage =
-		        new _writer_bits::GraphArcMapStorage<Graph, true, Map>(_graph, map);
+		        new _writer_bits::GraphArcMapStorage<GR, true, Map>(_graph, map);
 		      _edge_maps.push_back(std::make_pair('+' + caption, forward_storage));
 		      _writer_bits::MapStorageBase<Edge>* backward_storage =
-		        new _writer_bits::GraphArcMapStorage<Graph, false, Map>(_graph, map);
+		        new _writer_bits::GraphArcMapStorage<GR, false, Map>(_graph, map);
 		      _edge_maps.push_back(std::make_pair('-' + caption, backward_storage));
 		      return *this;
+		    }
 		    /// \brief Arc map writing rule
 		    ///
 		    /// Add an arc map writing rule with specialized converter to the
 		    /// writer.
 		    template <typename Map, typename Converter>
 		    GraphWriter& arcMap(const std::string& caption, const Map& map,
 		                          const Converter& converter = Converter()) {
 		      checkConcept<concepts::ReadMap<Arc, typename Map::Value>, Map>();
 		      _writer_bits::MapStorageBase<Edge>* forward_storage =
-		        new _writer_bits::GraphArcMapStorage<Graph, true, Map, Converter>
+		        new _writer_bits::GraphArcMapStorage<GR, true, Map, Converter>
 		        (_graph, map, converter);
 		      _edge_maps.push_back(std::make_pair('+' + caption, forward_storage));
 		      _writer_bits::MapStorageBase<Edge>* backward_storage =
-		        new _writer_bits::GraphArcMapStorage<Graph, false, Map, Converter>
+		        new _writer_bits::GraphArcMapStorage<GR, false, Map, Converter>
 		        (_graph, map, converter);
 		      _edge_maps.push_back(std::make_pair('-' + caption, backward_storage));
 		      return *this;
+		    }
 		    /// \brief Attribute writing rule
 		    ///
 		    /// Add an attribute writing rule to the writer.
 		    template <typename Value>
 		    GraphWriter& attribute(const std::string& caption, const Value& value) {
 		      _writer_bits::ValueStorageBase* storage =
 		        new _writer_bits::ValueStorage<Value>(value);
 		      _attributes.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Attribute writing rule
 		    ///
 		    /// Add an attribute writing rule with specialized converter to the
 		    /// writer.
 		    template <typename Value, typename Converter>
 		    GraphWriter& attribute(const std::string& caption, const Value& value,
 		                             const Converter& converter = Converter()) {
 		      _writer_bits::ValueStorageBase* storage =
 		        new _writer_bits::ValueStorage<Value, Converter>(value, converter);
 		      _attributes.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Node writing rule
 		    ///
 		    /// Add a node writing rule to the writer.
 		    GraphWriter& node(const std::string& caption, const Node& node) {
 		      typedef _writer_bits::MapLookUpConverter<Node> Converter;
 		      Converter converter(_node_index);
 		      _writer_bits::ValueStorageBase* storage =
 		        new _writer_bits::ValueStorage<Node, Converter>(node, converter);
 		      _attributes.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Edge writing rule
 		    ///
 		    /// Add an edge writing rule to writer.
 		    GraphWriter& edge(const std::string& caption, const Edge& edge) {
 		      typedef _writer_bits::MapLookUpConverter<Edge> Converter;
 		      Converter converter(_edge_index);
 		      _writer_bits::ValueStorageBase* storage =
 		        new _writer_bits::ValueStorage<Edge, Converter>(edge, converter);
 		      _attributes.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \brief Arc writing rule
 		    ///
 		    /// Add an arc writing rule to writer.
 		    GraphWriter& arc(const std::string& caption, const Arc& arc) {
-		      typedef _writer_bits::GraphArcLookUpConverter<Graph> Converter;
+		      typedef _writer_bits::GraphArcLookUpConverter<GR> Converter;
 		      Converter converter(_graph, _edge_index);
 		      _writer_bits::ValueStorageBase* storage =
 		        new _writer_bits::ValueStorage<Arc, Converter>(arc, converter);
 		      _attributes.push_back(std::make_pair(caption, storage));
 		      return *this;
+		    }
 		    /// \name Section captions
 		    /// @{
 		    /// \brief Add an additional caption to the \c \@nodes section
 		    ///
 		    /// Add an additional caption to the \c \@nodes section.
 		    GraphWriter& nodes(const std::string& caption) {
 		      _nodes_caption = caption;
 		      return *this;
+		    }
 		    /// \brief Add an additional caption to the \c \@arcs section
 		    ///
 		    /// Add an additional caption to the \c \@arcs section.
 		    GraphWriter& edges(const std::string& caption) {
 		      _edges_caption = caption;
 		      return *this;
+		    }
 		    /// \brief Add an additional caption to the \c \@attributes section
 		    ///
 		    /// Add an additional caption to the \c \@attributes section.
 		    GraphWriter& attributes(const std::string& caption) {
 		      _attributes_caption = caption;
 		      return *this;
+		    }
 		    /// \name Skipping section
 		    /// @{
 		    /// \brief Skip writing the node set
 		    ///
 		    /// The \c \@nodes section will not be written to the stream.
 		    GraphWriter& skipNodes() {
 		      LEMON_ASSERT(!_skip_nodes, "Multiple usage of skipNodes() member");
 		      _skip_nodes = true;
 		      return *this;
+		    }
 		    /// \brief Skip writing edge set
 		    ///
 		    /// The \c \@edges section will not be written to the stream.
 		    GraphWriter& skipEdges() {
 		      LEMON_ASSERT(!_skip_edges, "Multiple usage of skipEdges() member");
 		      _skip_edges = true;
 		      return *this;
+		    }
 		    /// @}
 		  private:
 		    void writeNodes() {
 		      _writer_bits::MapStorageBase<Node>* label = 0;
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        if (it->first == "label") {
 		          label = it->second;
 		          break;
+		        }
+		      }
 		      *_os << "@nodes";
 		      if (!_nodes_caption.empty()) {
 		        _writer_bits::writeToken(*_os << ' ', _nodes_caption);
+		      }
 		      *_os << std::endl;
 		      if (label == 0) {
 		        *_os << "label" << '\t';
+		      }
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        _writer_bits::writeToken(*_os, it->first) << '\t';
+		      }
 		      *_os << std::endl;
 		      std::vector<Node> nodes;
 		      for (NodeIt n(_graph); n != INVALID; ++n) {
 		        nodes.push_back(n);
+		      }
 		      if (label == 0) {
 		        IdMap<Graph, Node> id_map(_graph);
 		        _writer_bits::MapLess<IdMap<Graph, Node> > id_less(id_map);
 		        IdMap<GR, Node> id_map(_graph);
 		        _writer_bits::MapLess<IdMap<GR, Node> > id_less(id_map);
 		        std::sort(nodes.begin(), nodes.end(), id_less);
 		      } else {
 		        label->sort(nodes);
+		      }
 		      for (int i = 0; i < static_cast<int>(nodes.size()); ++i) {
 		        Node n = nodes[i];
 		        if (label == 0) {
 		          std::ostringstream os;
 		          os << _graph.id(n);
 		          _writer_bits::writeToken(*_os, os.str());
 		          *_os << '\t';
 		          _node_index.insert(std::make_pair(n, os.str()));
+		        }
 		        for (typename NodeMaps::iterator it = _node_maps.begin();
 		             it != _node_maps.end(); ++it) {
 		          std::string value = it->second->get(n);
 		          _writer_bits::writeToken(*_os, value);
 		          if (it->first == "label") {
 		            _node_index.insert(std::make_pair(n, value));
+		          }
 		          *_os << '\t';
+		        }
 		        *_os << std::endl;
+		      }
+		    }
 		    void createNodeIndex() {
 		      _writer_bits::MapStorageBase<Node>* label = 0;
 		      for (typename NodeMaps::iterator it = _node_maps.begin();
 		           it != _node_maps.end(); ++it) {
 		        if (it->first == "label") {
 		          label = it->second;
 		          break;
+		        }
+		      }
 		      if (label == 0) {
 		        for (NodeIt n(_graph); n != INVALID; ++n) {
 		          std::ostringstream os;
 		          os << _graph.id(n);
 		          _node_index.insert(std::make_pair(n, os.str()));
+		        }
 		      } else {
 		        for (NodeIt n(_graph); n != INVALID; ++n) {
 		          std::string value = label->get(n);
 		          _node_index.insert(std::make_pair(n, value));
+		        }
+		      }
+		    }
 		    void writeEdges() {
 		      _writer_bits::MapStorageBase<Edge>* label = 0;
 		      for (typename EdgeMaps::iterator it = _edge_maps.begin();
 		           it != _edge_maps.end(); ++it) {
 		        if (it->first == "label") {
 		          label = it->second;
 		          break;
+		        }
+		      }
 		      *_os << "@edges";
 		      if (!_edges_caption.empty()) {
 		        _writer_bits::writeToken(*_os << ' ', _edges_caption);
+		      }
 		      *_os << std::endl;
 		      *_os << '\t' << '\t';
 		      if (label == 0) {
 		        *_os << "label" << '\t';
+		      }
 		      for (typename EdgeMaps::iterator it = _edge_maps.begin();
 		           it != _edge_maps.end(); ++it) {
 		        _writer_bits::writeToken(*_os, it->first) << '\t';
+		      }
 		      *_os << std::endl;
 		      std::vector<Edge> edges;
 		      for (EdgeIt n(_graph); n != INVALID; ++n) {
 		        edges.push_back(n);
+		      }
 		      if (label == 0) {
 		        IdMap<Graph, Edge> id_map(_graph);
 		        _writer_bits::MapLess<IdMap<Graph, Edge> > id_less(id_map);
 		        IdMap<GR, Edge> id_map(_graph);
 		        _writer_bits::MapLess<IdMap<GR, Edge> > id_less(id_map);
 		        std::sort(edges.begin(), edges.end(), id_less);
 		      } else {
 		        label->sort(edges);
+		      }
 		      for (int i = 0; i < static_cast<int>(edges.size()); ++i) {
 		        Edge e = edges[i];
 		        _writer_bits::writeToken(*_os, _node_index.
 		                                 find(_graph.u(e))->second);
 		        *_os << '\t';
 		        _writer_bits::writeToken(*_os, _node_index.
 		                                 find(_graph.v(e))->second);
 		        *_os << '\t';
 		        if (label == 0) {
 		          std::ostringstream os;
 		          os << _graph.id(e);
 		          _writer_bits::writeToken(*_os, os.str());
 		          *_os << '\t';
 		          _edge_index.insert(std::make_pair(e, os.str()));
+		        }
 		        for (typename EdgeMaps::iterator it = _edge_maps.begin();
 		             it != _edge_maps.end(); ++it) {
 		          std::string value = it->second->get(e);
 		          _writer_bits::writeToken(*_os, value);
 		          if (it->first == "label") {
 		            _edge_index.insert(std::make_pair(e, value));
+		          }
 		          *_os << '\t';
+		        }
 		        *_os << std::endl;
+		      }
+		    }
 		    void createEdgeIndex() {
 		      _writer_bits::MapStorageBase<Edge>* label = 0;
 		      for (typename EdgeMaps::iterator it = _edge_maps.begin();
 		           it != _edge_maps.end(); ++it) {
 		        if (it->first == "label") {
 		          label = it->second;
 		          break;
+		        }
+		      }
 		      if (label == 0) {
 		        for (EdgeIt e(_graph); e != INVALID; ++e) {
 		          std::ostringstream os;
 		          os << _graph.id(e);
 		          _edge_index.insert(std::make_pair(e, os.str()));
@@ -1484,124 +1507,149 @@
 		    void writeAttributes() {
 		      if (_attributes.empty()) return;
 		      *_os << "@attributes";
 		      if (!_attributes_caption.empty()) {
 		        _writer_bits::writeToken(*_os << ' ', _attributes_caption);
+		      }
 		      *_os << std::endl;
 		      for (typename Attributes::iterator it = _attributes.begin();
 		           it != _attributes.end(); ++it) {
 		        _writer_bits::writeToken(*_os, it->first) << ' ';
 		        _writer_bits::writeToken(*_os, it->second->get());
 		        *_os << std::endl;
+		      }
+		    }
 		  public:
 		    /// \name Execution of the writer
 		    /// @{
 		    /// \brief Start the batch processing
 		    ///
 		    /// This function starts the batch processing.
 		    void run() {
 		      if (!_skip_nodes) {
 		        writeNodes();
 		      } else {
 		        createNodeIndex();
+		      }
 		      if (!_skip_edges) {
 		        writeEdges();
 		      } else {
 		        createEdgeIndex();
+		      }
 		      writeAttributes();
+		    }
 		    /// \brief Give back the stream of the writer
 		    ///
 		    /// Give back the stream of the writer
 		    std::ostream& ostream() {
 		      return *_os;
+		    }
 		    /// @}
 		  };
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief Return a \ref GraphWriter class
 		  ///
 		  /// This function just returns a \ref GraphWriter class.
+		  /// This function just returns a \ref GraphWriter class.
 		  ///
 		  /// With this function a graph can be write to a file or output
 		  /// stream in \ref lgf-format "LGF" format with several maps and
 		  /// attributes. For example, with the following code a weighted
 		  /// matching problem can be written to the standard output, i.e. a
 		  /// graph with a \e weight map on the edges:
 		  ///
 		  ///\code
 		  ///ListGraph graph;
 		  ///ListGraph::EdgeMap<int> weight(graph);
 		  ///  // Setting the weight map
 		  ///graphWriter(graph, std::cout).
 		  ///  edgeMap("weight", weight).
 		  ///  run();
 		  ///\endcode
 		  ///
 		  /// For a complete documentation, please see the \ref GraphWriter
 		  /// class documentation.
 		  /// \warning Don't forget to put the \ref GraphWriter::run() "run()"
 		  /// to the end of the parameter list.
 		  /// \relates GraphWriter
 		  template <typename Graph>
 		  GraphWriter<Graph> graphWriter(const Graph& graph,
 		                                 std::ostream& os) {
 		    GraphWriter<Graph> tmp(graph, os);
 		  /// \sa graphWriter(const TGR& graph, const std::string& fn)
 		  /// \sa graphWriter(const TGR& graph, const char* fn)
 		  template <typename TGR>
 		  GraphWriter<TGR> graphWriter(const TGR& graph, std::ostream& os) {
 		    GraphWriter<TGR> tmp(graph, os);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref GraphWriter class
 		  ///
 		  /// This function just returns a \ref GraphWriter class.
 		  /// \relates GraphWriter
 		  template <typename Graph>
 		  GraphWriter<Graph> graphWriter(const Graph& graph, const std::string& fn) {
-		    GraphWriter<Graph> tmp(graph, fn);
+		  /// \sa graphWriter(const TGR& graph, std::ostream& os)
 		  template <typename TGR>
 		  GraphWriter<TGR> graphWriter(const TGR& graph, const std::string& fn) {
 		    GraphWriter<TGR> tmp(graph, fn);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref GraphWriter class
 		  ///
 		  /// This function just returns a \ref GraphWriter class.
 		  /// \relates GraphWriter
 		  template <typename Graph>
 		  GraphWriter<Graph> graphWriter(const Graph& graph, const char* fn) {
-		    GraphWriter<Graph> tmp(graph, fn);
+		  /// \sa graphWriter(const TGR& graph, std::ostream& os)
 		  template <typename TGR>
 		  GraphWriter<TGR> graphWriter(const TGR& graph, const char* fn) {
 		    GraphWriter<TGR> tmp(graph, fn);
 		    return tmp;
+		  }
 		  class SectionWriter;
 		  SectionWriter sectionWriter(std::istream& is);
 		  SectionWriter sectionWriter(const std::string& fn);
 		  SectionWriter sectionWriter(const char* fn);
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief Section writer class
 		  ///
 		  /// In the \ref lgf-format "LGF" file extra sections can be placed,
 		  /// which contain any data in arbitrary format. Such sections can be
 		  /// written with this class. A writing rule can be added to the
 		  /// class with two different functions. With the \c sectionLines()
 		  /// function a generator can write the section line-by-line, while
 		  /// with the \c sectionStream() member the section can be written to
 		  /// an output stream.
 		  class SectionWriter {
 		  private:
 		    std::ostream* _os;
 		    bool local_os;
 		    typedef std::vector<std::pair<std::string, _writer_bits::Section*> >
 		    Sections;
 		    Sections _sections;
 		  public:
 		    /// \brief Constructor
 		    ///
 		    /// Construct a section writer, which writes to the given output
 		    /// stream.
 		    SectionWriter(std::ostream& os)
 		      : _os(&os), local_os(false) {}
 		    /// \brief Constructor
 		    ///
 		    /// Construct a section writer, which writes into the given file.
 		    SectionWriter(const std::string& fn)
 		      : _os(new std::ofstream(fn.c_str())), local_os(true) {
 		      if (!(*_os)) {
 		        delete _os;
 		        throw IoError("Cannot write file", fn);
@@ -1701,77 +1749,87 @@
 		    /// \brief Add a section writer with stream oriented writing
 		    ///
 		    /// The first parameter is the type of the section, the second is
 		    /// a functor, which takes a \c std::ostream& parameter. The
 		    /// functor writes the section to the output stream.
 		    /// \warning The last line must be closed with end-line character.
 		    template <typename Functor>
 		    SectionWriter& sectionStream(const std::string& type, Functor functor) {
 		      LEMON_ASSERT(!type.empty(), "Type is empty.");
 		      _sections.push_back(std::make_pair(type,
 		         new _writer_bits::StreamSection<Functor>(functor)));
 		      return *this;
+		    }
 		    /// @}
 		  public:
 		    /// \name Execution of the writer
 		    /// @{
 		    /// \brief Start the batch processing
 		    ///
 		    /// This function starts the batch processing.
 		    void run() {
 		      LEMON_ASSERT(_os != 0, "This writer is assigned to an other writer");
 		      for (Sections::iterator it = _sections.begin();
 		           it != _sections.end(); ++it) {
 		        (*_os) << '@' << it->first << std::endl;
 		        it->second->process(*_os);
+		      }
+		    }
 		    /// \brief Give back the stream of the writer
 		    ///
 		    /// Returns the stream of the writer
 		    std::ostream& ostream() {
 		      return *_os;
+		    }
 		    /// @}
 		  };
 		  /// \ingroup lemon_io
 		  ///
 		  /// \brief Return a \ref SectionWriter class
 		  ///
 		  /// This function just returns a \ref SectionWriter class.
 		  ///
 		  /// Please see SectionWriter documentation about the custom section
 		  /// output.
 		  ///
 		  /// \relates SectionWriter
 		  /// \sa sectionWriter(const std::string& fn)
 		  /// \sa sectionWriter(const char *fn)
 		  inline SectionWriter sectionWriter(std::ostream& os) {
 		    SectionWriter tmp(os);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref SectionWriter class
 		  ///
 		  /// This function just returns a \ref SectionWriter class.
 		  /// \relates SectionWriter
 		  /// \sa sectionWriter(std::ostream& os)
 		  inline SectionWriter sectionWriter(const std::string& fn) {
 		    SectionWriter tmp(fn);
 		    return tmp;
+		  }
 		  /// \brief Return a \ref SectionWriter class
 		  ///
 		  /// This function just returns a \ref SectionWriter class.
 		  /// \relates SectionWriter
 		  /// \sa sectionWriter(std::ostream& os)
 		  inline SectionWriter sectionWriter(const char* fn) {
 		    SectionWriter tmp(fn);
 		    return tmp;
+		  }
+		}
 		#endif

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