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kpeter (Peter Kovacs)
kpeter@inf.elte.hu
Doc improvements for Path and PathDumper concepts (#331)
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1 file changed with 44 insertions and 41 deletions:
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///\ingroup concept
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///\file
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///\brief Classes for representing paths in digraphs.
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///\brief The concept of paths
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///
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#ifndef LEMON_CONCEPTS_PATH_H
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    ///
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    /// A skeleton structure for representing directed paths in a
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    /// digraph.
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    /// In a sense, a path can be treated as a list of arcs.
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    /// LEMON path types just store this list. As a consequence, they cannot
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    /// enumerate the nodes on the path directly and a zero length path
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    /// cannot store its source node.
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    ///
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    /// The arcs of a path should be stored in the order of their directions,
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    /// i.e. the target node of each arc should be the same as the source
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    /// node of the next arc. This consistency could be checked using
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    /// \ref checkPath().
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    /// The source and target nodes of a (consistent) path can be obtained
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    /// using \ref pathSource() and \ref pathTarget().
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    ///
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    /// A path can be constructed from another path of any type using the
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    /// copy constructor or the assignment operator.
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    ///
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    /// \tparam GR The digraph type in which the path is.
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    ///
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    /// In a sense, the path can be treated as a list of arcs. The
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    /// lemon path type stores just this list. As a consequence it
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    /// cannot enumerate the nodes in the path and the zero length
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    /// paths cannot store the source.
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    ///
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    template <typename GR>
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    class Path {
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    public:
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      /// \brief Default constructor
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      Path() {}
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      /// \brief Template constructor
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      /// \brief Template copy constructor
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      template <typename CPath>
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      Path(const CPath& cpath) {}
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      /// \brief Template assigment
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      /// \brief Template assigment operator
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      template <typename CPath>
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      Path& operator=(const CPath& cpath) {
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        ignore_unused_variable_warning(cpath);
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        return *this;
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      }
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      /// Length of the path ie. the number of arcs in the path.
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      /// Length of the path, i.e. the number of arcs on the path.
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      int length() const { return 0;}
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      /// Returns whether the path is empty.
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      /// Resets the path to an empty path.
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      void clear() {}
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      /// \brief LEMON style iterator for path arcs
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      /// \brief LEMON style iterator for enumerating the arcs of a path.
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      ///
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      /// This class is used to iterate on the arcs of the paths.
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      /// LEMON style iterator class for enumerating the arcs of a path.
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      class ArcIt {
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      public:
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        /// Default constructor
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        ArcIt() {}
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        /// Invalid constructor
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        ArcIt(Invalid) {}
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        /// Constructor for first arc
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        /// Sets the iterator to the first arc of the given path
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        ArcIt(const Path &) {}
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        /// Conversion to Arc
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        /// Conversion to \c Arc
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        operator Arc() const { return INVALID; }
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        /// Next arc
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    /// \brief A skeleton structure for path dumpers.
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    ///
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    /// A skeleton structure for path dumpers. The path dumpers are
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    /// the generalization of the paths. The path dumpers can
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    /// enumerate the arcs of the path wheter in forward or in
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    /// backward order.  In most time these classes are not used
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    /// directly rather it used to assign a dumped class to a real
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    /// path type.
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    /// the generalization of the paths, they can enumerate the arcs
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    /// of the path either in forward or in backward order.
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    /// These classes are typically not used directly, they are rather
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    /// used to be assigned to a real path type.
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    ///
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    /// The main purpose of this concept is that the shortest path
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    /// algorithms can enumerate easily the arcs in reverse order.
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    /// If we would like to give back a real path from these
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    /// algorithms then we should create a temporarly path object. In
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    /// LEMON such algorithms gives back a path dumper what can
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    /// assigned to a real path and the dumpers can be implemented as
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    /// algorithms can enumerate the arcs easily in reverse order.
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    /// In LEMON, such algorithms give back a (reverse) path dumper that
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    /// can be assigned to a real path. The dumpers can be implemented as
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    /// an adaptor class to the predecessor map.
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    ///
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    /// \tparam GR The digraph type in which the path is.
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    ///
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    /// The paths can be constructed from any path type by a
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    /// template constructor or a template assignment operator.
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    template <typename GR>
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    class PathDumper {
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    public:
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      /// Arc type of the underlying digraph.
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      typedef typename Digraph::Arc Arc;
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      /// Length of the path ie. the number of arcs in the path.
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      /// Length of the path, i.e. the number of arcs on the path.
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      int length() const { return 0;}
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      /// Returns whether the path is empty.
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      /// \brief Forward or reverse dumping
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      ///
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      /// If the RevPathTag is defined and true then reverse dumping
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      /// is provided in the path dumper. In this case instead of the
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      /// ArcIt the RevArcIt iterator should be implemented in the
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      /// dumper.
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      /// If this tag is defined to be \c True, then reverse dumping
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      /// is provided in the path dumper. In this case, \c RevArcIt
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      /// iterator should be implemented instead of \c ArcIt iterator.
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      typedef False RevPathTag;
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      /// \brief LEMON style iterator for path arcs
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      /// \brief LEMON style iterator for enumerating the arcs of a path.
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      ///
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      /// This class is used to iterate on the arcs of the paths.
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      /// LEMON style iterator class for enumerating the arcs of a path.
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      class ArcIt {
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      public:
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        /// Default constructor
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        ArcIt() {}
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        /// Invalid constructor
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        ArcIt(Invalid) {}
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        /// Constructor for first arc
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        /// Sets the iterator to the first arc of the given path
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        ArcIt(const PathDumper&) {}
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        /// Conversion to Arc
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        /// Conversion to \c Arc
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        operator Arc() const { return INVALID; }
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        /// Next arc
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      };
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      /// \brief LEMON style iterator for path arcs
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      /// \brief LEMON style iterator for enumerating the arcs of a path
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      /// in reverse direction.
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      ///
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      /// This class is used to iterate on the arcs of the paths in
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      /// reverse direction.
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      /// LEMON style iterator class for enumerating the arcs of a path
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      /// in reverse direction.
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      class RevArcIt {
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      public:
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        /// Default constructor
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        RevArcIt() {}
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        /// Invalid constructor
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        RevArcIt(Invalid) {}
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        /// Constructor for first arc
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        /// Sets the iterator to the last arc of the given path
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        RevArcIt(const PathDumper &) {}
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        /// Conversion to Arc
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        /// Conversion to \c Arc
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        operator Arc() const { return INVALID; }
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        /// Next arc
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