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/* -*- mode: C++; indent-tabs-mode: nil; -*-
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*
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* This file is a part of LEMON, a generic C++ optimization library.
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*
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alpar@100
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* Copyright (C) 2003-2008
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alpar@100
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* Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
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* (Egervary Research Group on Combinatorial Optimization, EGRES).
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alpar@100
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*
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* Permission to use, modify and distribute this software is granted
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* provided that this copyright notice appears in all copies. For
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* precise terms see the accompanying LICENSE file.
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alpar@100
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*
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* This software is provided "AS IS" with no warranty of any kind,
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* express or implied, and with no claim as to its suitability for any
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* purpose.
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*
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*/
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#ifndef LEMON_DFS_H
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#define LEMON_DFS_H
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///\ingroup search
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///\file
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///\brief Dfs algorithm.
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#include <lemon/list_graph.h>
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#include <lemon/bits/path_dump.h>
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deba@220
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#include <lemon/core.h>
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#include <lemon/error.h>
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#include <lemon/maps.h>
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#include <lemon/concept_check.h>
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namespace lemon {
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///Default traits class of Dfs class.
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///Default traits class of Dfs class.
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kpeter@157
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///\tparam GR Digraph type.
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template<class GR>
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struct DfsDefaultTraits
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{
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///The digraph type the algorithm runs on.
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typedef GR Digraph;
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///\brief The type of the map that stores the last
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///arcs of the %DFS paths.
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///
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///The type of the map that stores the last
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///arcs of the %DFS paths.
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///It must meet the \ref concepts::WriteMap "WriteMap" concept.
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///
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typedef typename Digraph::template NodeMap<typename GR::Arc> PredMap;
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///Instantiates a PredMap.
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///This function instantiates a \ref PredMap.
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///\param G is the digraph, to which we would like to define the PredMap.
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///\todo The digraph alone may be insufficient to initialize
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static PredMap *createPredMap(const GR &G)
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{
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return new PredMap(G);
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}
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///The type of the map that indicates which nodes are processed.
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///The type of the map that indicates which nodes are processed.
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///It must meet the \ref concepts::WriteMap "WriteMap" concept.
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///\todo named parameter to set this type, function to read and write.
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typedef NullMap<typename Digraph::Node,bool> ProcessedMap;
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///Instantiates a ProcessedMap.
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///This function instantiates a \ref ProcessedMap.
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///\param g is the digraph, to which
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///we would like to define the \ref ProcessedMap
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#ifdef DOXYGEN
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static ProcessedMap *createProcessedMap(const GR &g)
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#else
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static ProcessedMap *createProcessedMap(const GR &)
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#endif
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{
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return new ProcessedMap();
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}
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///The type of the map that indicates which nodes are reached.
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alpar@209
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///The type of the map that indicates which nodes are reached.
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///It must meet the \ref concepts::WriteMap "WriteMap" concept.
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///\todo named parameter to set this type, function to read and write.
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typedef typename Digraph::template NodeMap<bool> ReachedMap;
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///Instantiates a ReachedMap.
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///This function instantiates a \ref ReachedMap.
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///\param G is the digraph, to which
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///we would like to define the \ref ReachedMap.
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static ReachedMap *createReachedMap(const GR &G)
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{
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return new ReachedMap(G);
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}
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///The type of the map that stores the dists of the nodes.
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///The type of the map that stores the dists of the nodes.
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///It must meet the \ref concepts::WriteMap "WriteMap" concept.
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///
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typedef typename Digraph::template NodeMap<int> DistMap;
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///Instantiates a DistMap.
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alpar@209
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///This function instantiates a \ref DistMap.
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///\param G is the digraph, to which we would like to define
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///the \ref DistMap
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static DistMap *createDistMap(const GR &G)
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{
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return new DistMap(G);
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}
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};
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alpar@209
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alpar@100
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///%DFS algorithm class.
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alpar@209
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///\ingroup search
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///This class provides an efficient implementation of the %DFS algorithm.
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///
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kpeter@157
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///\tparam GR The digraph type the algorithm runs on. The default value is
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alpar@100
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///\ref ListDigraph. The value of GR is not used directly by Dfs, it
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alpar@100
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///is only passed to \ref DfsDefaultTraits.
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kpeter@157
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///\tparam TR Traits class to set various data types used by the algorithm.
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alpar@100
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///The default traits class is
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alpar@100
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///\ref DfsDefaultTraits "DfsDefaultTraits<GR>".
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///See \ref DfsDefaultTraits for the documentation of
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///a Dfs traits class.
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alpar@100
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#ifdef DOXYGEN
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alpar@100
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template <typename GR,
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alpar@209
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typename TR>
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#else
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alpar@100
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template <typename GR=ListDigraph,
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typename TR=DfsDefaultTraits<GR> >
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#endif
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alpar@100
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class Dfs {
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alpar@100
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public:
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alpar@100
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/**
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alpar@100
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* \brief \ref Exception for uninitialized parameters.
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alpar@100
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*
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* This error represents problems in the initialization
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alpar@100
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* of the parameters of the algorithms.
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alpar@100
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*/
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alpar@100
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class UninitializedParameter : public lemon::UninitializedParameter {
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alpar@100
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public:
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alpar@100
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virtual const char* what() const throw() {
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alpar@209
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return "lemon::Dfs::UninitializedParameter";
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}
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alpar@100
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};
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alpar@100
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alpar@100
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typedef TR Traits;
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alpar@100
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///The type of the underlying digraph.
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alpar@100
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typedef typename TR::Digraph Digraph;
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alpar@100
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///\e
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alpar@100
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typedef typename Digraph::Node Node;
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alpar@100
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///\e
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alpar@100
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typedef typename Digraph::NodeIt NodeIt;
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alpar@100
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///\e
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alpar@100
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typedef typename Digraph::Arc Arc;
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alpar@100
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///\e
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alpar@100
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typedef typename Digraph::OutArcIt OutArcIt;
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alpar@209
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alpar@100
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///\brief The type of the map that stores the last
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alpar@100
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///arcs of the %DFS paths.
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alpar@100
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typedef typename TR::PredMap PredMap;
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alpar@100
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///The type of the map indicating which nodes are reached.
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alpar@100
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typedef typename TR::ReachedMap ReachedMap;
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alpar@100
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///The type of the map indicating which nodes are processed.
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alpar@100
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typedef typename TR::ProcessedMap ProcessedMap;
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alpar@100
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///The type of the map that stores the dists of the nodes.
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alpar@100
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typedef typename TR::DistMap DistMap;
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alpar@100
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private:
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alpar@100
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/// Pointer to the underlying digraph.
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alpar@100
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const Digraph *G;
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alpar@100
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///Pointer to the map of predecessors arcs.
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alpar@100
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PredMap *_pred;
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alpar@100
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///Indicates if \ref _pred is locally allocated (\c true) or not.
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alpar@100
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bool local_pred;
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alpar@100
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///Pointer to the map of distances.
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alpar@100
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DistMap *_dist;
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alpar@100
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///Indicates if \ref _dist is locally allocated (\c true) or not.
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alpar@100
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bool local_dist;
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alpar@100
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///Pointer to the map of reached status of the nodes.
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alpar@100
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ReachedMap *_reached;
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alpar@100
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///Indicates if \ref _reached is locally allocated (\c true) or not.
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alpar@100
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bool local_reached;
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alpar@100
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///Pointer to the map of processed status of the nodes.
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alpar@100
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ProcessedMap *_processed;
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alpar@100
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///Indicates if \ref _processed is locally allocated (\c true) or not.
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alpar@100
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bool local_processed;
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alpar@100
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alpar@100
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std::vector<typename Digraph::OutArcIt> _stack;
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alpar@100
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int _stack_head;
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alpar@100
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alpar@100
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///Creates the maps if necessary.
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alpar@209
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alpar@100
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///\todo Better memory allocation (instead of new).
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alpar@209
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void create_maps()
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alpar@100
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{
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alpar@100
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if(!_pred) {
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alpar@209
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local_pred = true;
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alpar@209
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_pred = Traits::createPredMap(*G);
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alpar@100
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}
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alpar@100
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if(!_dist) {
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alpar@209
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local_dist = true;
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alpar@209
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_dist = Traits::createDistMap(*G);
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alpar@100
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}
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alpar@100
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if(!_reached) {
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alpar@209
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local_reached = true;
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alpar@209
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_reached = Traits::createReachedMap(*G);
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alpar@100
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}
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alpar@100
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if(!_processed) {
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alpar@209
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local_processed = true;
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alpar@209
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_processed = Traits::createProcessedMap(*G);
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alpar@100
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}
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alpar@100
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}
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alpar@100
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alpar@100
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protected:
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alpar@100
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alpar@100
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Dfs() {}
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alpar@209
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220 |
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alpar@100
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public:
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alpar@100
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alpar@100
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typedef Dfs Create;
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alpar@100
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alpar@100
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///\name Named template parameters
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alpar@100
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alpar@100
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///@{
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alpar@100
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alpar@100
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template <class T>
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alpar@100
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struct DefPredMapTraits : public Traits {
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alpar@100
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typedef T PredMap;
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alpar@209
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static PredMap *createPredMap(const Digraph &G)
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alpar@100
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{
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alpar@209
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234 |
throw UninitializedParameter();
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alpar@100
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}
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alpar@100
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};
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alpar@100
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///\brief \ref named-templ-param "Named parameter" for setting
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alpar@100
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///PredMap type
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alpar@100
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///
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alpar@100
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///\ref named-templ-param "Named parameter" for setting PredMap type
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alpar@100
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241 |
///
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alpar@100
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242 |
template <class T>
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alpar@100
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243 |
struct DefPredMap : public Dfs<Digraph, DefPredMapTraits<T> > {
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alpar@100
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typedef Dfs<Digraph, DefPredMapTraits<T> > Create;
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alpar@100
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};
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alpar@209
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246 |
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alpar@209
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247 |
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alpar@100
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248 |
template <class T>
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alpar@100
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249 |
struct DefDistMapTraits : public Traits {
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alpar@100
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typedef T DistMap;
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alpar@209
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251 |
static DistMap *createDistMap(const Digraph &)
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alpar@100
|
252 |
{
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alpar@209
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253 |
throw UninitializedParameter();
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alpar@100
|
254 |
}
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alpar@100
|
255 |
};
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alpar@100
|
256 |
///\brief \ref named-templ-param "Named parameter" for setting
|
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alpar@100
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257 |
///DistMap type
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alpar@100
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258 |
///
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alpar@100
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259 |
///\ref named-templ-param "Named parameter" for setting DistMap
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alpar@100
|
260 |
///type
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alpar@100
|
261 |
template <class T>
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alpar@100
|
262 |
struct DefDistMap {
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alpar@100
|
263 |
typedef Dfs<Digraph, DefDistMapTraits<T> > Create;
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alpar@100
|
264 |
};
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alpar@209
|
265 |
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alpar@100
|
266 |
template <class T>
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alpar@100
|
267 |
struct DefReachedMapTraits : public Traits {
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alpar@100
|
268 |
typedef T ReachedMap;
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alpar@209
|
269 |
static ReachedMap *createReachedMap(const Digraph &)
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alpar@100
|
270 |
{
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alpar@209
|
271 |
throw UninitializedParameter();
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alpar@100
|
272 |
}
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alpar@100
|
273 |
};
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alpar@100
|
274 |
///\brief \ref named-templ-param "Named parameter" for setting
|
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alpar@100
|
275 |
///ReachedMap type
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alpar@100
|
276 |
///
|
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alpar@100
|
277 |
///\ref named-templ-param "Named parameter" for setting ReachedMap type
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alpar@100
|
278 |
///
|
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alpar@100
|
279 |
template <class T>
|
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alpar@100
|
280 |
struct DefReachedMap : public Dfs< Digraph, DefReachedMapTraits<T> > {
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alpar@100
|
281 |
typedef Dfs< Digraph, DefReachedMapTraits<T> > Create;
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alpar@100
|
282 |
};
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alpar@100
|
283 |
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alpar@100
|
284 |
template <class T>
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alpar@100
|
285 |
struct DefProcessedMapTraits : public Traits {
|
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alpar@100
|
286 |
typedef T ProcessedMap;
|
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alpar@209
|
287 |
static ProcessedMap *createProcessedMap(const Digraph &)
|
|
alpar@100
|
288 |
{
|
|
alpar@209
|
289 |
throw UninitializedParameter();
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alpar@100
|
290 |
}
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alpar@100
|
291 |
};
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alpar@100
|
292 |
///\brief \ref named-templ-param "Named parameter" for setting
|
|
alpar@100
|
293 |
///ProcessedMap type
|
|
alpar@100
|
294 |
///
|
|
alpar@100
|
295 |
///\ref named-templ-param "Named parameter" for setting ProcessedMap type
|
|
alpar@100
|
296 |
///
|
|
alpar@100
|
297 |
template <class T>
|
|
alpar@209
|
298 |
struct DefProcessedMap : public Dfs< Digraph, DefProcessedMapTraits<T> > {
|
|
alpar@100
|
299 |
typedef Dfs< Digraph, DefProcessedMapTraits<T> > Create;
|
|
alpar@100
|
300 |
};
|
|
alpar@209
|
301 |
|
|
alpar@100
|
302 |
struct DefDigraphProcessedMapTraits : public Traits {
|
|
alpar@100
|
303 |
typedef typename Digraph::template NodeMap<bool> ProcessedMap;
|
|
alpar@209
|
304 |
static ProcessedMap *createProcessedMap(const Digraph &G)
|
|
alpar@100
|
305 |
{
|
|
alpar@209
|
306 |
return new ProcessedMap(G);
|
|
alpar@100
|
307 |
}
|
|
alpar@100
|
308 |
};
|
|
alpar@100
|
309 |
///\brief \ref named-templ-param "Named parameter"
|
|
alpar@100
|
310 |
///for setting the ProcessedMap type to be Digraph::NodeMap<bool>.
|
|
alpar@100
|
311 |
///
|
|
alpar@100
|
312 |
///\ref named-templ-param "Named parameter"
|
|
alpar@100
|
313 |
///for setting the ProcessedMap type to be Digraph::NodeMap<bool>.
|
|
alpar@100
|
314 |
///If you don't set it explicitely, it will be automatically allocated.
|
|
alpar@100
|
315 |
template <class T>
|
|
alpar@100
|
316 |
class DefProcessedMapToBeDefaultMap :
|
|
alpar@209
|
317 |
public Dfs< Digraph, DefDigraphProcessedMapTraits> {
|
|
alpar@100
|
318 |
typedef Dfs< Digraph, DefDigraphProcessedMapTraits> Create;
|
|
alpar@100
|
319 |
};
|
|
alpar@209
|
320 |
|
|
alpar@100
|
321 |
///@}
|
|
alpar@100
|
322 |
|
|
alpar@209
|
323 |
public:
|
|
alpar@209
|
324 |
|
|
alpar@100
|
325 |
///Constructor.
|
|
alpar@209
|
326 |
|
|
alpar@100
|
327 |
///\param _G the digraph the algorithm will run on.
|
|
alpar@100
|
328 |
///
|
|
alpar@100
|
329 |
Dfs(const Digraph& _G) :
|
|
alpar@100
|
330 |
G(&_G),
|
|
alpar@100
|
331 |
_pred(NULL), local_pred(false),
|
|
alpar@100
|
332 |
_dist(NULL), local_dist(false),
|
|
alpar@100
|
333 |
_reached(NULL), local_reached(false),
|
|
alpar@100
|
334 |
_processed(NULL), local_processed(false)
|
|
alpar@100
|
335 |
{ }
|
|
alpar@209
|
336 |
|
|
alpar@100
|
337 |
///Destructor.
|
|
alpar@209
|
338 |
~Dfs()
|
|
alpar@100
|
339 |
{
|
|
alpar@100
|
340 |
if(local_pred) delete _pred;
|
|
alpar@100
|
341 |
if(local_dist) delete _dist;
|
|
alpar@100
|
342 |
if(local_reached) delete _reached;
|
|
alpar@100
|
343 |
if(local_processed) delete _processed;
|
|
alpar@100
|
344 |
}
|
|
alpar@100
|
345 |
|
|
alpar@100
|
346 |
///Sets the map storing the predecessor arcs.
|
|
alpar@100
|
347 |
|
|
alpar@100
|
348 |
///Sets the map storing the predecessor arcs.
|
|
alpar@100
|
349 |
///If you don't use this function before calling \ref run(),
|
|
alpar@100
|
350 |
///it will allocate one. The destuctor deallocates this
|
|
alpar@100
|
351 |
///automatically allocated map, of course.
|
|
alpar@100
|
352 |
///\return <tt> (*this) </tt>
|
|
alpar@209
|
353 |
Dfs &predMap(PredMap &m)
|
|
alpar@100
|
354 |
{
|
|
alpar@100
|
355 |
if(local_pred) {
|
|
alpar@209
|
356 |
delete _pred;
|
|
alpar@209
|
357 |
local_pred=false;
|
|
alpar@100
|
358 |
}
|
|
alpar@100
|
359 |
_pred = &m;
|
|
alpar@100
|
360 |
return *this;
|
|
alpar@100
|
361 |
}
|
|
alpar@100
|
362 |
|
|
alpar@100
|
363 |
///Sets the map storing the distances calculated by the algorithm.
|
|
alpar@100
|
364 |
|
|
alpar@100
|
365 |
///Sets the map storing the distances calculated by the algorithm.
|
|
alpar@100
|
366 |
///If you don't use this function before calling \ref run(),
|
|
alpar@100
|
367 |
///it will allocate one. The destuctor deallocates this
|
|
alpar@100
|
368 |
///automatically allocated map, of course.
|
|
alpar@100
|
369 |
///\return <tt> (*this) </tt>
|
|
alpar@209
|
370 |
Dfs &distMap(DistMap &m)
|
|
alpar@100
|
371 |
{
|
|
alpar@100
|
372 |
if(local_dist) {
|
|
alpar@209
|
373 |
delete _dist;
|
|
alpar@209
|
374 |
local_dist=false;
|
|
alpar@100
|
375 |
}
|
|
alpar@100
|
376 |
_dist = &m;
|
|
alpar@100
|
377 |
return *this;
|
|
alpar@100
|
378 |
}
|
|
alpar@100
|
379 |
|
|
alpar@100
|
380 |
///Sets the map indicating if a node is reached.
|
|
alpar@100
|
381 |
|
|
alpar@100
|
382 |
///Sets the map indicating if a node is reached.
|
|
alpar@100
|
383 |
///If you don't use this function before calling \ref run(),
|
|
alpar@100
|
384 |
///it will allocate one. The destuctor deallocates this
|
|
alpar@100
|
385 |
///automatically allocated map, of course.
|
|
alpar@100
|
386 |
///\return <tt> (*this) </tt>
|
|
alpar@209
|
387 |
Dfs &reachedMap(ReachedMap &m)
|
|
alpar@100
|
388 |
{
|
|
alpar@100
|
389 |
if(local_reached) {
|
|
alpar@209
|
390 |
delete _reached;
|
|
alpar@209
|
391 |
local_reached=false;
|
|
alpar@100
|
392 |
}
|
|
alpar@100
|
393 |
_reached = &m;
|
|
alpar@100
|
394 |
return *this;
|
|
alpar@100
|
395 |
}
|
|
alpar@100
|
396 |
|
|
alpar@100
|
397 |
///Sets the map indicating if a node is processed.
|
|
alpar@100
|
398 |
|
|
alpar@100
|
399 |
///Sets the map indicating if a node is processed.
|
|
alpar@100
|
400 |
///If you don't use this function before calling \ref run(),
|
|
alpar@100
|
401 |
///it will allocate one. The destuctor deallocates this
|
|
alpar@100
|
402 |
///automatically allocated map, of course.
|
|
alpar@100
|
403 |
///\return <tt> (*this) </tt>
|
|
alpar@209
|
404 |
Dfs &processedMap(ProcessedMap &m)
|
|
alpar@100
|
405 |
{
|
|
alpar@100
|
406 |
if(local_processed) {
|
|
alpar@209
|
407 |
delete _processed;
|
|
alpar@209
|
408 |
local_processed=false;
|
|
alpar@100
|
409 |
}
|
|
alpar@100
|
410 |
_processed = &m;
|
|
alpar@100
|
411 |
return *this;
|
|
alpar@100
|
412 |
}
|
|
alpar@100
|
413 |
|
|
alpar@100
|
414 |
public:
|
|
alpar@100
|
415 |
///\name Execution control
|
|
alpar@100
|
416 |
///The simplest way to execute the algorithm is to use
|
|
alpar@100
|
417 |
///one of the member functions called \c run(...).
|
|
alpar@100
|
418 |
///\n
|
|
alpar@100
|
419 |
///If you need more control on the execution,
|
|
alpar@100
|
420 |
///first you must call \ref init(), then you can add a source node
|
|
alpar@100
|
421 |
///with \ref addSource().
|
|
alpar@100
|
422 |
///Finally \ref start() will perform the actual path
|
|
alpar@100
|
423 |
///computation.
|
|
alpar@100
|
424 |
|
|
alpar@100
|
425 |
///@{
|
|
alpar@100
|
426 |
|
|
alpar@100
|
427 |
///Initializes the internal data structures.
|
|
alpar@100
|
428 |
|
|
alpar@100
|
429 |
///Initializes the internal data structures.
|
|
alpar@100
|
430 |
///
|
|
alpar@100
|
431 |
void init()
|
|
alpar@100
|
432 |
{
|
|
alpar@100
|
433 |
create_maps();
|
|
alpar@100
|
434 |
_stack.resize(countNodes(*G));
|
|
alpar@100
|
435 |
_stack_head=-1;
|
|
alpar@100
|
436 |
for ( NodeIt u(*G) ; u!=INVALID ; ++u ) {
|
|
alpar@209
|
437 |
_pred->set(u,INVALID);
|
|
alpar@209
|
438 |
// _predNode->set(u,INVALID);
|
|
alpar@209
|
439 |
_reached->set(u,false);
|
|
alpar@209
|
440 |
_processed->set(u,false);
|
|
alpar@100
|
441 |
}
|
|
alpar@100
|
442 |
}
|
|
alpar@209
|
443 |
|
|
alpar@100
|
444 |
///Adds a new source node.
|
|
alpar@100
|
445 |
|
|
alpar@100
|
446 |
///Adds a new source node to the set of nodes to be processed.
|
|
alpar@100
|
447 |
///
|
|
alpar@100
|
448 |
///\warning dists are wrong (or at least strange)
|
|
alpar@100
|
449 |
///in case of multiple sources.
|
|
alpar@100
|
450 |
void addSource(Node s)
|
|
alpar@100
|
451 |
{
|
|
alpar@100
|
452 |
if(!(*_reached)[s])
|
|
alpar@209
|
453 |
{
|
|
alpar@209
|
454 |
_reached->set(s,true);
|
|
alpar@209
|
455 |
_pred->set(s,INVALID);
|
|
alpar@209
|
456 |
OutArcIt e(*G,s);
|
|
alpar@209
|
457 |
if(e!=INVALID) {
|
|
alpar@209
|
458 |
_stack[++_stack_head]=e;
|
|
alpar@209
|
459 |
_dist->set(s,_stack_head);
|
|
alpar@209
|
460 |
}
|
|
alpar@209
|
461 |
else {
|
|
alpar@209
|
462 |
_processed->set(s,true);
|
|
alpar@209
|
463 |
_dist->set(s,0);
|
|
alpar@209
|
464 |
}
|
|
alpar@209
|
465 |
}
|
|
alpar@100
|
466 |
}
|
|
alpar@209
|
467 |
|
|
alpar@100
|
468 |
///Processes the next arc.
|
|
alpar@100
|
469 |
|
|
alpar@100
|
470 |
///Processes the next arc.
|
|
alpar@100
|
471 |
///
|
|
alpar@100
|
472 |
///\return The processed arc.
|
|
alpar@100
|
473 |
///
|
|
alpar@100
|
474 |
///\pre The stack must not be empty!
|
|
alpar@100
|
475 |
Arc processNextArc()
|
|
alpar@209
|
476 |
{
|
|
alpar@100
|
477 |
Node m;
|
|
alpar@100
|
478 |
Arc e=_stack[_stack_head];
|
|
alpar@100
|
479 |
if(!(*_reached)[m=G->target(e)]) {
|
|
alpar@209
|
480 |
_pred->set(m,e);
|
|
alpar@209
|
481 |
_reached->set(m,true);
|
|
alpar@209
|
482 |
++_stack_head;
|
|
alpar@209
|
483 |
_stack[_stack_head] = OutArcIt(*G, m);
|
|
alpar@209
|
484 |
_dist->set(m,_stack_head);
|
|
alpar@100
|
485 |
}
|
|
alpar@100
|
486 |
else {
|
|
alpar@209
|
487 |
m=G->source(e);
|
|
alpar@209
|
488 |
++_stack[_stack_head];
|
|
alpar@100
|
489 |
}
|
|
alpar@100
|
490 |
while(_stack_head>=0 && _stack[_stack_head]==INVALID) {
|
|
alpar@209
|
491 |
_processed->set(m,true);
|
|
alpar@209
|
492 |
--_stack_head;
|
|
alpar@209
|
493 |
if(_stack_head>=0) {
|
|
alpar@209
|
494 |
m=G->source(_stack[_stack_head]);
|
|
alpar@209
|
495 |
++_stack[_stack_head];
|
|
alpar@209
|
496 |
}
|
|
alpar@100
|
497 |
}
|
|
alpar@100
|
498 |
return e;
|
|
alpar@100
|
499 |
}
|
|
alpar@100
|
500 |
///Next arc to be processed.
|
|
alpar@100
|
501 |
|
|
alpar@100
|
502 |
///Next arc to be processed.
|
|
alpar@100
|
503 |
///
|
|
alpar@100
|
504 |
///\return The next arc to be processed or INVALID if the stack is
|
|
alpar@100
|
505 |
/// empty.
|
|
alpar@100
|
506 |
OutArcIt nextArc()
|
|
alpar@209
|
507 |
{
|
|
alpar@100
|
508 |
return _stack_head>=0?_stack[_stack_head]:INVALID;
|
|
alpar@100
|
509 |
}
|
|
alpar@100
|
510 |
|
|
alpar@100
|
511 |
///\brief Returns \c false if there are nodes
|
|
alpar@100
|
512 |
///to be processed in the queue
|
|
alpar@100
|
513 |
///
|
|
alpar@100
|
514 |
///Returns \c false if there are nodes
|
|
alpar@100
|
515 |
///to be processed in the queue
|
|
alpar@100
|
516 |
bool emptyQueue() { return _stack_head<0; }
|
|
alpar@100
|
517 |
///Returns the number of the nodes to be processed.
|
|
alpar@209
|
518 |
|
|
alpar@100
|
519 |
///Returns the number of the nodes to be processed in the queue.
|
|
alpar@100
|
520 |
int queueSize() { return _stack_head+1; }
|
|
alpar@209
|
521 |
|
|
alpar@100
|
522 |
///Executes the algorithm.
|
|
alpar@100
|
523 |
|
|
alpar@100
|
524 |
///Executes the algorithm.
|
|
alpar@100
|
525 |
///
|
|
alpar@100
|
526 |
///\pre init() must be called and at least one node should be added
|
|
alpar@100
|
527 |
///with addSource() before using this function.
|
|
alpar@100
|
528 |
///
|
|
alpar@100
|
529 |
///This method runs the %DFS algorithm from the root node(s)
|
|
alpar@100
|
530 |
///in order to
|
|
alpar@100
|
531 |
///compute the
|
|
alpar@100
|
532 |
///%DFS path to each node. The algorithm computes
|
|
alpar@100
|
533 |
///- The %DFS tree.
|
|
alpar@100
|
534 |
///- The distance of each node from the root(s) in the %DFS tree.
|
|
alpar@100
|
535 |
///
|
|
alpar@100
|
536 |
void start()
|
|
alpar@100
|
537 |
{
|
|
alpar@100
|
538 |
while ( !emptyQueue() ) processNextArc();
|
|
alpar@100
|
539 |
}
|
|
alpar@209
|
540 |
|
|
alpar@100
|
541 |
///Executes the algorithm until \c dest is reached.
|
|
alpar@100
|
542 |
|
|
alpar@100
|
543 |
///Executes the algorithm until \c dest is reached.
|
|
alpar@100
|
544 |
///
|
|
alpar@100
|
545 |
///\pre init() must be called and at least one node should be added
|
|
alpar@100
|
546 |
///with addSource() before using this function.
|
|
alpar@100
|
547 |
///
|
|
alpar@100
|
548 |
///This method runs the %DFS algorithm from the root node(s)
|
|
alpar@100
|
549 |
///in order to
|
|
alpar@100
|
550 |
///compute the
|
|
alpar@100
|
551 |
///%DFS path to \c dest. The algorithm computes
|
|
alpar@100
|
552 |
///- The %DFS path to \c dest.
|
|
alpar@100
|
553 |
///- The distance of \c dest from the root(s) in the %DFS tree.
|
|
alpar@100
|
554 |
///
|
|
alpar@100
|
555 |
void start(Node dest)
|
|
alpar@100
|
556 |
{
|
|
alpar@209
|
557 |
while ( !emptyQueue() && G->target(_stack[_stack_head])!=dest )
|
|
alpar@209
|
558 |
processNextArc();
|
|
alpar@100
|
559 |
}
|
|
alpar@209
|
560 |
|
|
alpar@100
|
561 |
///Executes the algorithm until a condition is met.
|
|
alpar@100
|
562 |
|
|
alpar@100
|
563 |
///Executes the algorithm until a condition is met.
|
|
alpar@100
|
564 |
///
|
|
alpar@100
|
565 |
///\pre init() must be called and at least one node should be added
|
|
alpar@100
|
566 |
///with addSource() before using this function.
|
|
alpar@100
|
567 |
///
|
|
alpar@100
|
568 |
///\param em must be a bool (or convertible) arc map. The algorithm
|
|
alpar@100
|
569 |
///will stop when it reaches an arc \c e with <tt>em[e]</tt> true.
|
|
alpar@100
|
570 |
///
|
|
alpar@100
|
571 |
///\return The reached arc \c e with <tt>em[e]</tt> true or
|
|
alpar@100
|
572 |
///\c INVALID if no such arc was found.
|
|
alpar@100
|
573 |
///
|
|
alpar@100
|
574 |
///\warning Contrary to \ref Bfs and \ref Dijkstra, \c em is an arc map,
|
|
alpar@100
|
575 |
///not a node map.
|
|
alpar@100
|
576 |
template<class EM>
|
|
alpar@100
|
577 |
Arc start(const EM &em)
|
|
alpar@100
|
578 |
{
|
|
alpar@100
|
579 |
while ( !emptyQueue() && !em[_stack[_stack_head]] )
|
|
alpar@100
|
580 |
processNextArc();
|
|
alpar@100
|
581 |
return emptyQueue() ? INVALID : _stack[_stack_head];
|
|
alpar@100
|
582 |
}
|
|
alpar@100
|
583 |
|
|
alpar@100
|
584 |
///Runs %DFS algorithm to visit all nodes in the digraph.
|
|
alpar@209
|
585 |
|
|
alpar@100
|
586 |
///This method runs the %DFS algorithm in order to
|
|
alpar@100
|
587 |
///compute the
|
|
alpar@100
|
588 |
///%DFS path to each node. The algorithm computes
|
|
alpar@100
|
589 |
///- The %DFS tree.
|
|
alpar@100
|
590 |
///- The distance of each node from the root in the %DFS tree.
|
|
alpar@100
|
591 |
///
|
|
alpar@100
|
592 |
///\note d.run() is just a shortcut of the following code.
|
|
alpar@100
|
593 |
///\code
|
|
alpar@100
|
594 |
/// d.init();
|
|
alpar@100
|
595 |
/// for (NodeIt it(digraph); it != INVALID; ++it) {
|
|
alpar@100
|
596 |
/// if (!d.reached(it)) {
|
|
alpar@100
|
597 |
/// d.addSource(it);
|
|
alpar@100
|
598 |
/// d.start();
|
|
alpar@100
|
599 |
/// }
|
|
alpar@100
|
600 |
/// }
|
|
alpar@100
|
601 |
///\endcode
|
|
alpar@100
|
602 |
void run() {
|
|
alpar@100
|
603 |
init();
|
|
alpar@100
|
604 |
for (NodeIt it(*G); it != INVALID; ++it) {
|
|
alpar@100
|
605 |
if (!reached(it)) {
|
|
alpar@100
|
606 |
addSource(it);
|
|
alpar@100
|
607 |
start();
|
|
alpar@100
|
608 |
}
|
|
alpar@100
|
609 |
}
|
|
alpar@100
|
610 |
}
|
|
alpar@100
|
611 |
|
|
alpar@100
|
612 |
///Runs %DFS algorithm from node \c s.
|
|
alpar@209
|
613 |
|
|
alpar@100
|
614 |
///This method runs the %DFS algorithm from a root node \c s
|
|
alpar@100
|
615 |
///in order to
|
|
alpar@100
|
616 |
///compute the
|
|
alpar@100
|
617 |
///%DFS path to each node. The algorithm computes
|
|
alpar@100
|
618 |
///- The %DFS tree.
|
|
alpar@100
|
619 |
///- The distance of each node from the root in the %DFS tree.
|
|
alpar@100
|
620 |
///
|
|
alpar@100
|
621 |
///\note d.run(s) is just a shortcut of the following code.
|
|
alpar@100
|
622 |
///\code
|
|
alpar@100
|
623 |
/// d.init();
|
|
alpar@100
|
624 |
/// d.addSource(s);
|
|
alpar@100
|
625 |
/// d.start();
|
|
alpar@100
|
626 |
///\endcode
|
|
alpar@100
|
627 |
void run(Node s) {
|
|
alpar@100
|
628 |
init();
|
|
alpar@100
|
629 |
addSource(s);
|
|
alpar@100
|
630 |
start();
|
|
alpar@100
|
631 |
}
|
|
alpar@209
|
632 |
|
|
alpar@100
|
633 |
///Finds the %DFS path between \c s and \c t.
|
|
alpar@209
|
634 |
|
|
alpar@100
|
635 |
///Finds the %DFS path between \c s and \c t.
|
|
alpar@100
|
636 |
///
|
|
alpar@100
|
637 |
///\return The length of the %DFS s---t path if there exists one,
|
|
alpar@100
|
638 |
///0 otherwise.
|
|
alpar@100
|
639 |
///\note Apart from the return value, d.run(s,t) is
|
|
alpar@100
|
640 |
///just a shortcut of the following code.
|
|
alpar@100
|
641 |
///\code
|
|
alpar@100
|
642 |
/// d.init();
|
|
alpar@100
|
643 |
/// d.addSource(s);
|
|
alpar@100
|
644 |
/// d.start(t);
|
|
alpar@100
|
645 |
///\endcode
|
|
alpar@100
|
646 |
int run(Node s,Node t) {
|
|
alpar@100
|
647 |
init();
|
|
alpar@100
|
648 |
addSource(s);
|
|
alpar@100
|
649 |
start(t);
|
|
alpar@100
|
650 |
return reached(t)?_stack_head+1:0;
|
|
alpar@100
|
651 |
}
|
|
alpar@209
|
652 |
|
|
alpar@100
|
653 |
///@}
|
|
alpar@100
|
654 |
|
|
alpar@100
|
655 |
///\name Query Functions
|
|
alpar@100
|
656 |
///The result of the %DFS algorithm can be obtained using these
|
|
alpar@100
|
657 |
///functions.\n
|
|
alpar@100
|
658 |
///Before the use of these functions,
|
|
alpar@100
|
659 |
///either run() or start() must be called.
|
|
alpar@209
|
660 |
|
|
alpar@100
|
661 |
///@{
|
|
alpar@100
|
662 |
|
|
alpar@100
|
663 |
typedef PredMapPath<Digraph, PredMap> Path;
|
|
alpar@100
|
664 |
|
|
alpar@100
|
665 |
///Gives back the shortest path.
|
|
alpar@209
|
666 |
|
|
alpar@100
|
667 |
///Gives back the shortest path.
|
|
alpar@100
|
668 |
///\pre The \c t should be reachable from the source.
|
|
alpar@209
|
669 |
Path path(Node t)
|
|
alpar@100
|
670 |
{
|
|
alpar@100
|
671 |
return Path(*G, *_pred, t);
|
|
alpar@100
|
672 |
}
|
|
alpar@100
|
673 |
|
|
alpar@100
|
674 |
///The distance of a node from the root(s).
|
|
alpar@100
|
675 |
|
|
alpar@100
|
676 |
///Returns the distance of a node from the root(s).
|
|
alpar@100
|
677 |
///\pre \ref run() must be called before using this function.
|
|
alpar@209
|
678 |
///\warning If node \c v is unreachable from the root(s) then the return
|
|
alpar@100
|
679 |
///value of this funcion is undefined.
|
|
alpar@100
|
680 |
int dist(Node v) const { return (*_dist)[v]; }
|
|
alpar@100
|
681 |
|
|
alpar@100
|
682 |
///Returns the 'previous arc' of the %DFS tree.
|
|
alpar@100
|
683 |
|
|
alpar@100
|
684 |
///For a node \c v it returns the 'previous arc'
|
|
alpar@100
|
685 |
///of the %DFS path,
|
|
alpar@100
|
686 |
///i.e. it returns the last arc of a %DFS path from the root(s) to \c
|
|
alpar@100
|
687 |
///v. It is \ref INVALID
|
|
alpar@100
|
688 |
///if \c v is unreachable from the root(s) or \c v is a root. The
|
|
alpar@100
|
689 |
///%DFS tree used here is equal to the %DFS tree used in
|
|
alpar@100
|
690 |
///\ref predNode().
|
|
alpar@100
|
691 |
///\pre Either \ref run() or \ref start() must be called before using
|
|
alpar@100
|
692 |
///this function.
|
|
alpar@100
|
693 |
Arc predArc(Node v) const { return (*_pred)[v];}
|
|
alpar@100
|
694 |
|
|
alpar@100
|
695 |
///Returns the 'previous node' of the %DFS tree.
|
|
alpar@100
|
696 |
|
|
alpar@100
|
697 |
///For a node \c v it returns the 'previous node'
|
|
alpar@100
|
698 |
///of the %DFS tree,
|
|
alpar@100
|
699 |
///i.e. it returns the last but one node from a %DFS path from the
|
|
alpar@100
|
700 |
///root(s) to \c v.
|
|
alpar@100
|
701 |
///It is INVALID if \c v is unreachable from the root(s) or
|
|
alpar@100
|
702 |
///if \c v itself a root.
|
|
alpar@100
|
703 |
///The %DFS tree used here is equal to the %DFS
|
|
alpar@100
|
704 |
///tree used in \ref predArc().
|
|
alpar@100
|
705 |
///\pre Either \ref run() or \ref start() must be called before
|
|
alpar@100
|
706 |
///using this function.
|
|
alpar@100
|
707 |
Node predNode(Node v) const { return (*_pred)[v]==INVALID ? INVALID:
|
|
alpar@209
|
708 |
G->source((*_pred)[v]); }
|
|
alpar@209
|
709 |
|
|
alpar@100
|
710 |
///Returns a reference to the NodeMap of distances.
|
|
alpar@100
|
711 |
|
|
alpar@100
|
712 |
///Returns a reference to the NodeMap of distances.
|
|
alpar@100
|
713 |
///\pre Either \ref run() or \ref init() must
|
|
alpar@100
|
714 |
///be called before using this function.
|
|
alpar@100
|
715 |
const DistMap &distMap() const { return *_dist;}
|
|
alpar@209
|
716 |
|
|
alpar@100
|
717 |
///Returns a reference to the %DFS arc-tree map.
|
|
alpar@100
|
718 |
|
|
alpar@100
|
719 |
///Returns a reference to the NodeMap of the arcs of the
|
|
alpar@100
|
720 |
///%DFS tree.
|
|
alpar@100
|
721 |
///\pre Either \ref run() or \ref init()
|
|
alpar@100
|
722 |
///must be called before using this function.
|
|
alpar@100
|
723 |
const PredMap &predMap() const { return *_pred;}
|
|
alpar@209
|
724 |
|
|
alpar@100
|
725 |
///Checks if a node is reachable from the root.
|
|
alpar@100
|
726 |
|
|
alpar@100
|
727 |
///Returns \c true if \c v is reachable from the root(s).
|
|
alpar@100
|
728 |
///\warning The source nodes are inditated as unreachable.
|
|
alpar@100
|
729 |
///\pre Either \ref run() or \ref start()
|
|
alpar@100
|
730 |
///must be called before using this function.
|
|
alpar@100
|
731 |
///
|
|
alpar@100
|
732 |
bool reached(Node v) { return (*_reached)[v]; }
|
|
alpar@209
|
733 |
|
|
alpar@100
|
734 |
///@}
|
|
alpar@100
|
735 |
};
|
|
alpar@100
|
736 |
|
|
alpar@100
|
737 |
///Default traits class of Dfs function.
|
|
alpar@100
|
738 |
|
|
alpar@100
|
739 |
///Default traits class of Dfs function.
|
|
kpeter@157
|
740 |
///\tparam GR Digraph type.
|
|
alpar@100
|
741 |
template<class GR>
|
|
alpar@100
|
742 |
struct DfsWizardDefaultTraits
|
|
alpar@100
|
743 |
{
|
|
alpar@209
|
744 |
///The digraph type the algorithm runs on.
|
|
alpar@100
|
745 |
typedef GR Digraph;
|
|
alpar@100
|
746 |
///\brief The type of the map that stores the last
|
|
alpar@100
|
747 |
///arcs of the %DFS paths.
|
|
alpar@209
|
748 |
///
|
|
alpar@100
|
749 |
///The type of the map that stores the last
|
|
alpar@100
|
750 |
///arcs of the %DFS paths.
|
|
alpar@100
|
751 |
///It must meet the \ref concepts::WriteMap "WriteMap" concept.
|
|
alpar@100
|
752 |
///
|
|
alpar@100
|
753 |
typedef NullMap<typename Digraph::Node,typename GR::Arc> PredMap;
|
|
alpar@100
|
754 |
///Instantiates a PredMap.
|
|
alpar@209
|
755 |
|
|
alpar@209
|
756 |
///This function instantiates a \ref PredMap.
|
|
alpar@100
|
757 |
///\param g is the digraph, to which we would like to define the PredMap.
|
|
alpar@100
|
758 |
///\todo The digraph alone may be insufficient to initialize
|
|
alpar@100
|
759 |
#ifdef DOXYGEN
|
|
alpar@209
|
760 |
static PredMap *createPredMap(const GR &g)
|
|
alpar@100
|
761 |
#else
|
|
alpar@209
|
762 |
static PredMap *createPredMap(const GR &)
|
|
alpar@100
|
763 |
#endif
|
|
alpar@100
|
764 |
{
|
|
alpar@100
|
765 |
return new PredMap();
|
|
alpar@100
|
766 |
}
|
|
alpar@100
|
767 |
|
|
alpar@100
|
768 |
///The type of the map that indicates which nodes are processed.
|
|
alpar@209
|
769 |
|
|
alpar@100
|
770 |
///The type of the map that indicates which nodes are processed.
|
|
alpar@100
|
771 |
///It must meet the \ref concepts::WriteMap "WriteMap" concept.
|
|
alpar@100
|
772 |
///\todo named parameter to set this type, function to read and write.
|
|
alpar@100
|
773 |
typedef NullMap<typename Digraph::Node,bool> ProcessedMap;
|
|
alpar@100
|
774 |
///Instantiates a ProcessedMap.
|
|
alpar@209
|
775 |
|
|
alpar@209
|
776 |
///This function instantiates a \ref ProcessedMap.
|
|
alpar@100
|
777 |
///\param g is the digraph, to which
|
|
alpar@100
|
778 |
///we would like to define the \ref ProcessedMap
|
|
alpar@100
|
779 |
#ifdef DOXYGEN
|
|
alpar@100
|
780 |
static ProcessedMap *createProcessedMap(const GR &g)
|
|
alpar@100
|
781 |
#else
|
|
alpar@100
|
782 |
static ProcessedMap *createProcessedMap(const GR &)
|
|
alpar@100
|
783 |
#endif
|
|
alpar@100
|
784 |
{
|
|
alpar@100
|
785 |
return new ProcessedMap();
|
|
alpar@100
|
786 |
}
|
|
alpar@100
|
787 |
///The type of the map that indicates which nodes are reached.
|
|
alpar@209
|
788 |
|
|
alpar@100
|
789 |
///The type of the map that indicates which nodes are reached.
|
|
alpar@100
|
790 |
///It must meet the \ref concepts::WriteMap "WriteMap" concept.
|
|
alpar@100
|
791 |
///\todo named parameter to set this type, function to read and write.
|
|
alpar@100
|
792 |
typedef typename Digraph::template NodeMap<bool> ReachedMap;
|
|
alpar@100
|
793 |
///Instantiates a ReachedMap.
|
|
alpar@209
|
794 |
|
|
alpar@209
|
795 |
///This function instantiates a \ref ReachedMap.
|
|
alpar@100
|
796 |
///\param G is the digraph, to which
|
|
alpar@100
|
797 |
///we would like to define the \ref ReachedMap.
|
|
alpar@100
|
798 |
static ReachedMap *createReachedMap(const GR &G)
|
|
alpar@100
|
799 |
{
|
|
alpar@100
|
800 |
return new ReachedMap(G);
|
|
alpar@100
|
801 |
}
|
|
alpar@100
|
802 |
///The type of the map that stores the dists of the nodes.
|
|
alpar@209
|
803 |
|
|
alpar@100
|
804 |
///The type of the map that stores the dists of the nodes.
|
|
alpar@100
|
805 |
///It must meet the \ref concepts::WriteMap "WriteMap" concept.
|
|
alpar@100
|
806 |
///
|
|
alpar@100
|
807 |
typedef NullMap<typename Digraph::Node,int> DistMap;
|
|
alpar@100
|
808 |
///Instantiates a DistMap.
|
|
alpar@209
|
809 |
|
|
alpar@209
|
810 |
///This function instantiates a \ref DistMap.
|
|
alpar@210
|
811 |
///\param g is the digraph, to which we would like to define
|
|
alpar@210
|
812 |
///the \ref DistMap
|
|
alpar@100
|
813 |
#ifdef DOXYGEN
|
|
alpar@100
|
814 |
static DistMap *createDistMap(const GR &g)
|
|
alpar@100
|
815 |
#else
|
|
alpar@100
|
816 |
static DistMap *createDistMap(const GR &)
|
|
alpar@100
|
817 |
#endif
|
|
alpar@100
|
818 |
{
|
|
alpar@100
|
819 |
return new DistMap();
|
|
alpar@100
|
820 |
}
|
|
alpar@100
|
821 |
};
|
|
alpar@209
|
822 |
|
|
alpar@100
|
823 |
/// Default traits used by \ref DfsWizard
|
|
alpar@100
|
824 |
|
|
alpar@100
|
825 |
/// To make it easier to use Dfs algorithm
|
|
alpar@100
|
826 |
///we have created a wizard class.
|
|
alpar@100
|
827 |
/// This \ref DfsWizard class needs default traits,
|
|
alpar@100
|
828 |
///as well as the \ref Dfs class.
|
|
alpar@100
|
829 |
/// The \ref DfsWizardBase is a class to be the default traits of the
|
|
alpar@100
|
830 |
/// \ref DfsWizard class.
|
|
alpar@100
|
831 |
template<class GR>
|
|
alpar@100
|
832 |
class DfsWizardBase : public DfsWizardDefaultTraits<GR>
|
|
alpar@100
|
833 |
{
|
|
alpar@100
|
834 |
|
|
alpar@100
|
835 |
typedef DfsWizardDefaultTraits<GR> Base;
|
|
alpar@100
|
836 |
protected:
|
|
alpar@100
|
837 |
/// Type of the nodes in the digraph.
|
|
alpar@100
|
838 |
typedef typename Base::Digraph::Node Node;
|
|
alpar@100
|
839 |
|
|
alpar@100
|
840 |
/// Pointer to the underlying digraph.
|
|
alpar@100
|
841 |
void *_g;
|
|
alpar@100
|
842 |
///Pointer to the map of reached nodes.
|
|
alpar@100
|
843 |
void *_reached;
|
|
alpar@100
|
844 |
///Pointer to the map of processed nodes.
|
|
alpar@100
|
845 |
void *_processed;
|
|
alpar@100
|
846 |
///Pointer to the map of predecessors arcs.
|
|
alpar@100
|
847 |
void *_pred;
|
|
alpar@100
|
848 |
///Pointer to the map of distances.
|
|
alpar@100
|
849 |
void *_dist;
|
|
alpar@100
|
850 |
///Pointer to the source node.
|
|
alpar@100
|
851 |
Node _source;
|
|
alpar@209
|
852 |
|
|
alpar@100
|
853 |
public:
|
|
alpar@100
|
854 |
/// Constructor.
|
|
alpar@209
|
855 |
|
|
alpar@100
|
856 |
/// This constructor does not require parameters, therefore it initiates
|
|
alpar@100
|
857 |
/// all of the attributes to default values (0, INVALID).
|
|
alpar@100
|
858 |
DfsWizardBase() : _g(0), _reached(0), _processed(0), _pred(0),
|
|
alpar@209
|
859 |
_dist(0), _source(INVALID) {}
|
|
alpar@100
|
860 |
|
|
alpar@100
|
861 |
/// Constructor.
|
|
alpar@209
|
862 |
|
|
alpar@100
|
863 |
/// This constructor requires some parameters,
|
|
alpar@100
|
864 |
/// listed in the parameters list.
|
|
alpar@100
|
865 |
/// Others are initiated to 0.
|
|
alpar@100
|
866 |
/// \param g is the initial value of \ref _g
|
|
alpar@100
|
867 |
/// \param s is the initial value of \ref _source
|
|
alpar@100
|
868 |
DfsWizardBase(const GR &g, Node s=INVALID) :
|
|
alpar@209
|
869 |
_g(reinterpret_cast<void*>(const_cast<GR*>(&g))),
|
|
alpar@100
|
870 |
_reached(0), _processed(0), _pred(0), _dist(0), _source(s) {}
|
|
alpar@100
|
871 |
|
|
alpar@100
|
872 |
};
|
|
alpar@209
|
873 |
|
|
alpar@100
|
874 |
/// A class to make the usage of the Dfs algorithm easier
|
|
alpar@100
|
875 |
|
|
alpar@100
|
876 |
/// This class is created to make it easier to use the Dfs algorithm.
|
|
alpar@100
|
877 |
/// It uses the functions and features of the plain \ref Dfs,
|
|
alpar@100
|
878 |
/// but it is much simpler to use it.
|
|
alpar@100
|
879 |
///
|
|
alpar@100
|
880 |
/// Simplicity means that the way to change the types defined
|
|
alpar@100
|
881 |
/// in the traits class is based on functions that returns the new class
|
|
alpar@100
|
882 |
/// and not on templatable built-in classes.
|
|
alpar@100
|
883 |
/// When using the plain \ref Dfs
|
|
alpar@100
|
884 |
/// the new class with the modified type comes from
|
|
alpar@100
|
885 |
/// the original class by using the ::
|
|
alpar@100
|
886 |
/// operator. In the case of \ref DfsWizard only
|
|
alpar@100
|
887 |
/// a function have to be called and it will
|
|
alpar@100
|
888 |
/// return the needed class.
|
|
alpar@100
|
889 |
///
|
|
alpar@100
|
890 |
/// It does not have own \ref run method. When its \ref run method is called
|
|
alpar@100
|
891 |
/// it initiates a plain \ref Dfs object, and calls the \ref Dfs::run
|
|
alpar@100
|
892 |
/// method of it.
|
|
alpar@100
|
893 |
template<class TR>
|
|
alpar@100
|
894 |
class DfsWizard : public TR
|
|
alpar@100
|
895 |
{
|
|
alpar@100
|
896 |
typedef TR Base;
|
|
alpar@100
|
897 |
|
|
alpar@100
|
898 |
///The type of the underlying digraph.
|
|
alpar@100
|
899 |
typedef typename TR::Digraph Digraph;
|
|
alpar@100
|
900 |
//\e
|
|
alpar@100
|
901 |
typedef typename Digraph::Node Node;
|
|
alpar@100
|
902 |
//\e
|
|
alpar@100
|
903 |
typedef typename Digraph::NodeIt NodeIt;
|
|
alpar@100
|
904 |
//\e
|
|
alpar@100
|
905 |
typedef typename Digraph::Arc Arc;
|
|
alpar@100
|
906 |
//\e
|
|
alpar@100
|
907 |
typedef typename Digraph::OutArcIt OutArcIt;
|
|
alpar@209
|
908 |
|
|
alpar@100
|
909 |
///\brief The type of the map that stores
|
|
alpar@100
|
910 |
///the reached nodes
|
|
alpar@100
|
911 |
typedef typename TR::ReachedMap ReachedMap;
|
|
alpar@100
|
912 |
///\brief The type of the map that stores
|
|
alpar@100
|
913 |
///the processed nodes
|
|
alpar@100
|
914 |
typedef typename TR::ProcessedMap ProcessedMap;
|
|
alpar@100
|
915 |
///\brief The type of the map that stores the last
|
|
alpar@100
|
916 |
///arcs of the %DFS paths.
|
|
alpar@100
|
917 |
typedef typename TR::PredMap PredMap;
|
|
alpar@100
|
918 |
///The type of the map that stores the distances of the nodes.
|
|
alpar@100
|
919 |
typedef typename TR::DistMap DistMap;
|
|
alpar@100
|
920 |
|
|
alpar@100
|
921 |
public:
|
|
alpar@100
|
922 |
/// Constructor.
|
|
alpar@100
|
923 |
DfsWizard() : TR() {}
|
|
alpar@100
|
924 |
|
|
alpar@100
|
925 |
/// Constructor that requires parameters.
|
|
alpar@100
|
926 |
|
|
alpar@100
|
927 |
/// Constructor that requires parameters.
|
|
alpar@100
|
928 |
/// These parameters will be the default values for the traits class.
|
|
alpar@100
|
929 |
DfsWizard(const Digraph &g, Node s=INVALID) :
|
|
alpar@100
|
930 |
TR(g,s) {}
|
|
alpar@100
|
931 |
|
|
alpar@100
|
932 |
///Copy constructor
|
|
alpar@100
|
933 |
DfsWizard(const TR &b) : TR(b) {}
|
|
alpar@100
|
934 |
|
|
alpar@100
|
935 |
~DfsWizard() {}
|
|
alpar@100
|
936 |
|
|
alpar@100
|
937 |
///Runs Dfs algorithm from a given node.
|
|
alpar@209
|
938 |
|
|
alpar@100
|
939 |
///Runs Dfs algorithm from a given node.
|
|
alpar@100
|
940 |
///The node can be given by the \ref source function.
|
|
alpar@100
|
941 |
void run()
|
|
alpar@100
|
942 |
{
|
|
alpar@100
|
943 |
if(Base::_source==INVALID) throw UninitializedParameter();
|
|
alpar@100
|
944 |
Dfs<Digraph,TR> alg(*reinterpret_cast<const Digraph*>(Base::_g));
|
|
alpar@209
|
945 |
if(Base::_reached)
|
|
alpar@100
|
946 |
alg.reachedMap(*reinterpret_cast<ReachedMap*>(Base::_reached));
|
|
alpar@209
|
947 |
if(Base::_processed)
|
|
alpar@100
|
948 |
alg.processedMap(*reinterpret_cast<ProcessedMap*>(Base::_processed));
|
|
alpar@209
|
949 |
if(Base::_pred)
|
|
alpar@100
|
950 |
alg.predMap(*reinterpret_cast<PredMap*>(Base::_pred));
|
|
alpar@209
|
951 |
if(Base::_dist)
|
|
alpar@100
|
952 |
alg.distMap(*reinterpret_cast<DistMap*>(Base::_dist));
|
|
alpar@100
|
953 |
alg.run(Base::_source);
|
|
alpar@100
|
954 |
}
|
|
alpar@100
|
955 |
|
|
alpar@100
|
956 |
///Runs Dfs algorithm from the given node.
|
|
alpar@100
|
957 |
|
|
alpar@100
|
958 |
///Runs Dfs algorithm from the given node.
|
|
alpar@100
|
959 |
///\param s is the given source.
|
|
alpar@100
|
960 |
void run(Node s)
|
|
alpar@100
|
961 |
{
|
|
alpar@100
|
962 |
Base::_source=s;
|
|
alpar@100
|
963 |
run();
|
|
alpar@100
|
964 |
}
|
|
alpar@100
|
965 |
|
|
alpar@100
|
966 |
template<class T>
|
|
alpar@100
|
967 |
struct DefPredMapBase : public Base {
|
|
alpar@100
|
968 |
typedef T PredMap;
|
|
alpar@100
|
969 |
static PredMap *createPredMap(const Digraph &) { return 0; };
|
|
alpar@100
|
970 |
DefPredMapBase(const TR &b) : TR(b) {}
|
|
alpar@100
|
971 |
};
|
|
alpar@209
|
972 |
|
|
alpar@100
|
973 |
///\brief \ref named-templ-param "Named parameter"
|
|
alpar@100
|
974 |
///function for setting PredMap type
|
|
alpar@100
|
975 |
///
|
|
alpar@100
|
976 |
/// \ref named-templ-param "Named parameter"
|
|
alpar@100
|
977 |
///function for setting PredMap type
|
|
alpar@100
|
978 |
///
|
|
alpar@100
|
979 |
template<class T>
|
|
alpar@209
|
980 |
DfsWizard<DefPredMapBase<T> > predMap(const T &t)
|
|
alpar@100
|
981 |
{
|
|
alpar@100
|
982 |
Base::_pred=reinterpret_cast<void*>(const_cast<T*>(&t));
|
|
alpar@100
|
983 |
return DfsWizard<DefPredMapBase<T> >(*this);
|
|
alpar@100
|
984 |
}
|
|
alpar@209
|
985 |
|
|
alpar@209
|
986 |
|
|
alpar@100
|
987 |
template<class T>
|
|
alpar@100
|
988 |
struct DefReachedMapBase : public Base {
|
|
alpar@100
|
989 |
typedef T ReachedMap;
|
|
alpar@100
|
990 |
static ReachedMap *createReachedMap(const Digraph &) { return 0; };
|
|
alpar@100
|
991 |
DefReachedMapBase(const TR &b) : TR(b) {}
|
|
alpar@100
|
992 |
};
|
|
alpar@209
|
993 |
|
|
alpar@100
|
994 |
///\brief \ref named-templ-param "Named parameter"
|
|
alpar@100
|
995 |
///function for setting ReachedMap
|
|
alpar@100
|
996 |
///
|
|
alpar@100
|
997 |
/// \ref named-templ-param "Named parameter"
|
|
alpar@100
|
998 |
///function for setting ReachedMap
|
|
alpar@100
|
999 |
///
|
|
alpar@100
|
1000 |
template<class T>
|
|
alpar@209
|
1001 |
DfsWizard<DefReachedMapBase<T> > reachedMap(const T &t)
|
|
alpar@100
|
1002 |
{
|
|
deba@158
|
1003 |
Base::_reached=reinterpret_cast<void*>(const_cast<T*>(&t));
|
|
alpar@100
|
1004 |
return DfsWizard<DefReachedMapBase<T> >(*this);
|
|
alpar@100
|
1005 |
}
|
|
alpar@209
|
1006 |
|
|
alpar@100
|
1007 |
|
|
alpar@100
|
1008 |
template<class T>
|
|
alpar@100
|
1009 |
struct DefProcessedMapBase : public Base {
|
|
alpar@100
|
1010 |
typedef T ProcessedMap;
|
|
alpar@100
|
1011 |
static ProcessedMap *createProcessedMap(const Digraph &) { return 0; };
|
|
alpar@100
|
1012 |
DefProcessedMapBase(const TR &b) : TR(b) {}
|
|
alpar@100
|
1013 |
};
|
|
alpar@209
|
1014 |
|
|
alpar@100
|
1015 |
///\brief \ref named-templ-param "Named parameter"
|
|
alpar@100
|
1016 |
///function for setting ProcessedMap
|
|
alpar@100
|
1017 |
///
|
|
alpar@100
|
1018 |
/// \ref named-templ-param "Named parameter"
|
|
alpar@100
|
1019 |
///function for setting ProcessedMap
|
|
alpar@100
|
1020 |
///
|
|
alpar@100
|
1021 |
template<class T>
|
|
alpar@209
|
1022 |
DfsWizard<DefProcessedMapBase<T> > processedMap(const T &t)
|
|
alpar@100
|
1023 |
{
|
|
deba@158
|
1024 |
Base::_processed=reinterpret_cast<void*>(const_cast<T*>(&t));
|
|
alpar@100
|
1025 |
return DfsWizard<DefProcessedMapBase<T> >(*this);
|
|
alpar@100
|
1026 |
}
|
|
alpar@209
|
1027 |
|
|
alpar@100
|
1028 |
template<class T>
|
|
alpar@100
|
1029 |
struct DefDistMapBase : public Base {
|
|
alpar@100
|
1030 |
typedef T DistMap;
|
|
alpar@100
|
1031 |
static DistMap *createDistMap(const Digraph &) { return 0; };
|
|
alpar@100
|
1032 |
DefDistMapBase(const TR &b) : TR(b) {}
|
|
alpar@100
|
1033 |
};
|
|
alpar@209
|
1034 |
|
|
alpar@100
|
1035 |
///\brief \ref named-templ-param "Named parameter"
|
|
alpar@100
|
1036 |
///function for setting DistMap type
|
|
alpar@100
|
1037 |
///
|
|
alpar@100
|
1038 |
/// \ref named-templ-param "Named parameter"
|
|
alpar@100
|
1039 |
///function for setting DistMap type
|
|
alpar@100
|
1040 |
///
|
|
alpar@100
|
1041 |
template<class T>
|
|
alpar@209
|
1042 |
DfsWizard<DefDistMapBase<T> > distMap(const T &t)
|
|
alpar@100
|
1043 |
{
|
|
alpar@100
|
1044 |
Base::_dist=reinterpret_cast<void*>(const_cast<T*>(&t));
|
|
alpar@100
|
1045 |
return DfsWizard<DefDistMapBase<T> >(*this);
|
|
alpar@100
|
1046 |
}
|
|
alpar@209
|
1047 |
|
|
alpar@100
|
1048 |
/// Sets the source node, from which the Dfs algorithm runs.
|
|
alpar@100
|
1049 |
|
|
alpar@100
|
1050 |
/// Sets the source node, from which the Dfs algorithm runs.
|
|
alpar@100
|
1051 |
/// \param s is the source node.
|
|
alpar@209
|
1052 |
DfsWizard<TR> &source(Node s)
|
|
alpar@100
|
1053 |
{
|
|
alpar@100
|
1054 |
Base::_source=s;
|
|
alpar@100
|
1055 |
return *this;
|
|
alpar@100
|
1056 |
}
|
|
alpar@209
|
1057 |
|
|
alpar@100
|
1058 |
};
|
|
alpar@209
|
1059 |
|
|
alpar@100
|
1060 |
///Function type interface for Dfs algorithm.
|
|
alpar@100
|
1061 |
|
|
alpar@100
|
1062 |
///\ingroup search
|
|
alpar@100
|
1063 |
///Function type interface for Dfs algorithm.
|
|
alpar@100
|
1064 |
///
|
|
alpar@100
|
1065 |
///This function also has several
|
|
alpar@100
|
1066 |
///\ref named-templ-func-param "named parameters",
|
|
alpar@100
|
1067 |
///they are declared as the members of class \ref DfsWizard.
|
|
alpar@100
|
1068 |
///The following
|
|
alpar@100
|
1069 |
///example shows how to use these parameters.
|
|
alpar@100
|
1070 |
///\code
|
|
alpar@100
|
1071 |
/// dfs(g,source).predMap(preds).run();
|
|
alpar@100
|
1072 |
///\endcode
|
|
alpar@100
|
1073 |
///\warning Don't forget to put the \ref DfsWizard::run() "run()"
|
|
alpar@100
|
1074 |
///to the end of the parameter list.
|
|
alpar@100
|
1075 |
///\sa DfsWizard
|
|
alpar@100
|
1076 |
///\sa Dfs
|
|
alpar@100
|
1077 |
template<class GR>
|
|
alpar@100
|
1078 |
DfsWizard<DfsWizardBase<GR> >
|
|
alpar@100
|
1079 |
dfs(const GR &g,typename GR::Node s=INVALID)
|
|
alpar@100
|
1080 |
{
|
|
alpar@100
|
1081 |
return DfsWizard<DfsWizardBase<GR> >(g,s);
|
|
alpar@100
|
1082 |
}
|
|
alpar@100
|
1083 |
|
|
alpar@100
|
1084 |
#ifdef DOXYGEN
|
|
alpar@100
|
1085 |
/// \brief Visitor class for dfs.
|
|
alpar@209
|
1086 |
///
|
|
alpar@209
|
1087 |
/// It gives a simple interface for a functional interface for dfs
|
|
alpar@209
|
1088 |
/// traversal. The traversal on a linear data structure.
|
|
alpar@100
|
1089 |
template <typename _Digraph>
|
|
alpar@100
|
1090 |
struct DfsVisitor {
|
|
alpar@100
|
1091 |
typedef _Digraph Digraph;
|
|
alpar@100
|
1092 |
typedef typename Digraph::Arc Arc;
|
|
alpar@100
|
1093 |
typedef typename Digraph::Node Node;
|
|
alpar@100
|
1094 |
/// \brief Called when the arc reach a node.
|
|
alpar@209
|
1095 |
///
|
|
alpar@100
|
1096 |
/// It is called when the dfs find an arc which target is not
|
|
alpar@100
|
1097 |
/// reached yet.
|
|
alpar@100
|
1098 |
void discover(const Arc& arc) {}
|
|
alpar@100
|
1099 |
/// \brief Called when the node reached first time.
|
|
alpar@209
|
1100 |
///
|
|
alpar@100
|
1101 |
/// It is Called when the node reached first time.
|
|
alpar@100
|
1102 |
void reach(const Node& node) {}
|
|
alpar@100
|
1103 |
/// \brief Called when we step back on an arc.
|
|
alpar@209
|
1104 |
///
|
|
alpar@100
|
1105 |
/// It is called when the dfs should step back on the arc.
|
|
alpar@100
|
1106 |
void backtrack(const Arc& arc) {}
|
|
alpar@100
|
1107 |
/// \brief Called when we step back from the node.
|
|
alpar@209
|
1108 |
///
|
|
alpar@100
|
1109 |
/// It is called when we step back from the node.
|
|
alpar@100
|
1110 |
void leave(const Node& node) {}
|
|
alpar@209
|
1111 |
/// \brief Called when the arc examined but target of the arc
|
|
alpar@100
|
1112 |
/// already discovered.
|
|
alpar@209
|
1113 |
///
|
|
alpar@209
|
1114 |
/// It called when the arc examined but the target of the arc
|
|
alpar@100
|
1115 |
/// already discovered.
|
|
alpar@100
|
1116 |
void examine(const Arc& arc) {}
|
|
alpar@100
|
1117 |
/// \brief Called for the source node of the dfs.
|
|
alpar@209
|
1118 |
///
|
|
alpar@100
|
1119 |
/// It is called for the source node of the dfs.
|
|
alpar@100
|
1120 |
void start(const Node& node) {}
|
|
alpar@100
|
1121 |
/// \brief Called when we leave the source node of the dfs.
|
|
alpar@209
|
1122 |
///
|
|
alpar@100
|
1123 |
/// It is called when we leave the source node of the dfs.
|
|
alpar@100
|
1124 |
void stop(const Node& node) {}
|
|
alpar@100
|
1125 |
|
|
alpar@100
|
1126 |
};
|
|
alpar@100
|
1127 |
#else
|
|
alpar@100
|
1128 |
template <typename _Digraph>
|
|
alpar@100
|
1129 |
struct DfsVisitor {
|
|
alpar@100
|
1130 |
typedef _Digraph Digraph;
|
|
alpar@100
|
1131 |
typedef typename Digraph::Arc Arc;
|
|
alpar@100
|
1132 |
typedef typename Digraph::Node Node;
|
|
alpar@100
|
1133 |
void discover(const Arc&) {}
|
|
alpar@100
|
1134 |
void reach(const Node&) {}
|
|
alpar@100
|
1135 |
void backtrack(const Arc&) {}
|
|
alpar@100
|
1136 |
void leave(const Node&) {}
|
|
alpar@100
|
1137 |
void examine(const Arc&) {}
|
|
alpar@100
|
1138 |
void start(const Node&) {}
|
|
alpar@100
|
1139 |
void stop(const Node&) {}
|
|
alpar@100
|
1140 |
|
|
alpar@100
|
1141 |
template <typename _Visitor>
|
|
alpar@100
|
1142 |
struct Constraints {
|
|
alpar@100
|
1143 |
void constraints() {
|
|
alpar@209
|
1144 |
Arc arc;
|
|
alpar@209
|
1145 |
Node node;
|
|
alpar@209
|
1146 |
visitor.discover(arc);
|
|
alpar@209
|
1147 |
visitor.reach(node);
|
|
alpar@209
|
1148 |
visitor.backtrack(arc);
|
|
alpar@209
|
1149 |
visitor.leave(node);
|
|
alpar@209
|
1150 |
visitor.examine(arc);
|
|
alpar@209
|
1151 |
visitor.start(node);
|
|
alpar@209
|
1152 |
visitor.stop(arc);
|
|
alpar@100
|
1153 |
}
|
|
alpar@100
|
1154 |
_Visitor& visitor;
|
|
alpar@100
|
1155 |
};
|
|
alpar@100
|
1156 |
};
|
|
alpar@100
|
1157 |
#endif
|
|
alpar@100
|
1158 |
|
|
alpar@100
|
1159 |
/// \brief Default traits class of DfsVisit class.
|
|
alpar@100
|
1160 |
///
|
|
alpar@100
|
1161 |
/// Default traits class of DfsVisit class.
|
|
kpeter@157
|
1162 |
/// \tparam _Digraph Digraph type.
|
|
alpar@100
|
1163 |
template<class _Digraph>
|
|
alpar@100
|
1164 |
struct DfsVisitDefaultTraits {
|
|
alpar@100
|
1165 |
|
|
alpar@209
|
1166 |
/// \brief The digraph type the algorithm runs on.
|
|
alpar@100
|
1167 |
typedef _Digraph Digraph;
|
|
alpar@100
|
1168 |
|
|
alpar@100
|
1169 |
/// \brief The type of the map that indicates which nodes are reached.
|
|
alpar@209
|
1170 |
///
|
|
alpar@100
|
1171 |
/// The type of the map that indicates which nodes are reached.
|
|
alpar@100
|
1172 |
/// It must meet the \ref concepts::WriteMap "WriteMap" concept.
|
|
alpar@100
|
1173 |
/// \todo named parameter to set this type, function to read and write.
|
|
alpar@100
|
1174 |
typedef typename Digraph::template NodeMap<bool> ReachedMap;
|
|
alpar@100
|
1175 |
|
|
alpar@100
|
1176 |
/// \brief Instantiates a ReachedMap.
|
|
alpar@100
|
1177 |
///
|
|
alpar@209
|
1178 |
/// This function instantiates a \ref ReachedMap.
|
|
alpar@100
|
1179 |
/// \param digraph is the digraph, to which
|
|
alpar@100
|
1180 |
/// we would like to define the \ref ReachedMap.
|
|
alpar@100
|
1181 |
static ReachedMap *createReachedMap(const Digraph &digraph) {
|
|
alpar@100
|
1182 |
return new ReachedMap(digraph);
|
|
alpar@100
|
1183 |
}
|
|
alpar@100
|
1184 |
|
|
alpar@100
|
1185 |
};
|
|
alpar@209
|
1186 |
|
|
alpar@100
|
1187 |
/// %DFS Visit algorithm class.
|
|
alpar@209
|
1188 |
|
|
alpar@100
|
1189 |
/// \ingroup search
|
|
alpar@100
|
1190 |
/// This class provides an efficient implementation of the %DFS algorithm
|
|
alpar@100
|
1191 |
/// with visitor interface.
|
|
alpar@100
|
1192 |
///
|
|
alpar@100
|
1193 |
/// The %DfsVisit class provides an alternative interface to the Dfs
|
|
alpar@100
|
1194 |
/// class. It works with callback mechanism, the DfsVisit object calls
|
|
alpar@209
|
1195 |
/// on every dfs event the \c Visitor class member functions.
|
|
alpar@100
|
1196 |
///
|
|
alpar@210
|
1197 |
/// \tparam _Digraph The digraph type the algorithm runs on.
|
|
alpar@210
|
1198 |
/// The default value is
|
|
alpar@100
|
1199 |
/// \ref ListDigraph. The value of _Digraph is not used directly by Dfs, it
|
|
alpar@100
|
1200 |
/// is only passed to \ref DfsDefaultTraits.
|
|
alpar@209
|
1201 |
/// \tparam _Visitor The Visitor object for the algorithm. The
|
|
alpar@100
|
1202 |
/// \ref DfsVisitor "DfsVisitor<_Digraph>" is an empty Visitor which
|
|
alpar@100
|
1203 |
/// does not observe the Dfs events. If you want to observe the dfs
|
|
alpar@100
|
1204 |
/// events you should implement your own Visitor class.
|
|
alpar@209
|
1205 |
/// \tparam _Traits Traits class to set various data types used by the
|
|
alpar@100
|
1206 |
/// algorithm. The default traits class is
|
|
alpar@100
|
1207 |
/// \ref DfsVisitDefaultTraits "DfsVisitDefaultTraits<_Digraph>".
|
|
alpar@100
|
1208 |
/// See \ref DfsVisitDefaultTraits for the documentation of
|
|
alpar@100
|
1209 |
/// a Dfs visit traits class.
|
|
alpar@100
|
1210 |
///
|
|
alpar@100
|
1211 |
/// \author Jacint Szabo, Alpar Juttner and Balazs Dezso
|
|
alpar@100
|
1212 |
#ifdef DOXYGEN
|
|
alpar@100
|
1213 |
template <typename _Digraph, typename _Visitor, typename _Traits>
|
|
alpar@100
|
1214 |
#else
|
|
alpar@100
|
1215 |
template <typename _Digraph = ListDigraph,
|
|
alpar@209
|
1216 |
typename _Visitor = DfsVisitor<_Digraph>,
|
|
alpar@209
|
1217 |
typename _Traits = DfsDefaultTraits<_Digraph> >
|
|
alpar@100
|
1218 |
#endif
|
|
alpar@100
|
1219 |
class DfsVisit {
|
|
alpar@100
|
1220 |
public:
|
|
alpar@209
|
1221 |
|
|
alpar@100
|
1222 |
/// \brief \ref Exception for uninitialized parameters.
|
|
alpar@100
|
1223 |
///
|
|
alpar@100
|
1224 |
/// This error represents problems in the initialization
|
|
alpar@100
|
1225 |
/// of the parameters of the algorithms.
|
|
alpar@100
|
1226 |
class UninitializedParameter : public lemon::UninitializedParameter {
|
|
alpar@100
|
1227 |
public:
|
|
alpar@209
|
1228 |
virtual const char* what() const throw()
|
|
alpar@100
|
1229 |
{
|
|
alpar@209
|
1230 |
return "lemon::DfsVisit::UninitializedParameter";
|
|
alpar@100
|
1231 |
}
|
|
alpar@100
|
1232 |
};
|
|
alpar@100
|
1233 |
|
|
alpar@100
|
1234 |
typedef _Traits Traits;
|
|
alpar@100
|
1235 |
|
|
alpar@100
|
1236 |
typedef typename Traits::Digraph Digraph;
|
|
alpar@100
|
1237 |
|
|
alpar@100
|
1238 |
typedef _Visitor Visitor;
|
|
alpar@100
|
1239 |
|
|
alpar@100
|
1240 |
///The type of the map indicating which nodes are reached.
|
|
alpar@100
|
1241 |
typedef typename Traits::ReachedMap ReachedMap;
|
|
alpar@100
|
1242 |
|
|
alpar@100
|
1243 |
private:
|
|
alpar@100
|
1244 |
|
|
alpar@100
|
1245 |
typedef typename Digraph::Node Node;
|
|
alpar@100
|
1246 |
typedef typename Digraph::NodeIt NodeIt;
|
|
alpar@100
|
1247 |
typedef typename Digraph::Arc Arc;
|
|
alpar@100
|
1248 |
typedef typename Digraph::OutArcIt OutArcIt;
|
|
alpar@100
|
1249 |
|
|
alpar@100
|
1250 |
/// Pointer to the underlying digraph.
|
|
alpar@100
|
1251 |
const Digraph *_digraph;
|
|
alpar@100
|
1252 |
/// Pointer to the visitor object.
|
|
alpar@100
|
1253 |
Visitor *_visitor;
|
|
alpar@100
|
1254 |
///Pointer to the map of reached status of the nodes.
|
|
alpar@100
|
1255 |
ReachedMap *_reached;
|
|
alpar@100
|
1256 |
///Indicates if \ref _reached is locally allocated (\c true) or not.
|
|
alpar@100
|
1257 |
bool local_reached;
|
|
alpar@100
|
1258 |
|
|
alpar@100
|
1259 |
std::vector<typename Digraph::Arc> _stack;
|
|
alpar@100
|
1260 |
int _stack_head;
|
|
alpar@100
|
1261 |
|
|
alpar@100
|
1262 |
/// \brief Creates the maps if necessary.
|
|
alpar@100
|
1263 |
///
|
|
alpar@100
|
1264 |
/// Creates the maps if necessary.
|
|
alpar@100
|
1265 |
void create_maps() {
|
|
alpar@100
|
1266 |
if(!_reached) {
|
|
alpar@209
|
1267 |
local_reached = true;
|
|
alpar@209
|
1268 |
_reached = Traits::createReachedMap(*_digraph);
|
|
alpar@100
|
1269 |
}
|
|
alpar@100
|
1270 |
}
|
|
alpar@100
|
1271 |
|
|
alpar@100
|
1272 |
protected:
|
|
alpar@100
|
1273 |
|
|
alpar@100
|
1274 |
DfsVisit() {}
|
|
alpar@209
|
1275 |
|
|
alpar@100
|
1276 |
public:
|
|
alpar@100
|
1277 |
|
|
alpar@100
|
1278 |
typedef DfsVisit Create;
|
|
alpar@100
|
1279 |
|
|
alpar@100
|
1280 |
/// \name Named template parameters
|
|
alpar@100
|
1281 |
|
|
alpar@100
|
1282 |
///@{
|
|
alpar@100
|
1283 |
template <class T>
|
|
alpar@100
|
1284 |
struct DefReachedMapTraits : public Traits {
|
|
alpar@100
|
1285 |
typedef T ReachedMap;
|
|
alpar@100
|
1286 |
static ReachedMap *createReachedMap(const Digraph &digraph) {
|
|
alpar@209
|
1287 |
throw UninitializedParameter();
|
|
alpar@100
|
1288 |
}
|
|
alpar@100
|
1289 |
};
|
|
alpar@209
|
1290 |
/// \brief \ref named-templ-param "Named parameter" for setting
|
|
alpar@100
|
1291 |
/// ReachedMap type
|
|
alpar@100
|
1292 |
///
|
|
alpar@100
|
1293 |
/// \ref named-templ-param "Named parameter" for setting ReachedMap type
|
|
alpar@100
|
1294 |
template <class T>
|
|
alpar@100
|
1295 |
struct DefReachedMap : public DfsVisit< Digraph, Visitor,
|
|
alpar@209
|
1296 |
DefReachedMapTraits<T> > {
|
|
alpar@100
|
1297 |
typedef DfsVisit< Digraph, Visitor, DefReachedMapTraits<T> > Create;
|
|
alpar@100
|
1298 |
};
|
|
alpar@100
|
1299 |
///@}
|
|
alpar@100
|
1300 |
|
|
alpar@209
|
1301 |
public:
|
|
alpar@209
|
1302 |
|
|
alpar@100
|
1303 |
/// \brief Constructor.
|
|
alpar@100
|
1304 |
///
|
|
alpar@100
|
1305 |
/// Constructor.
|
|
alpar@100
|
1306 |
///
|
|
alpar@100
|
1307 |
/// \param digraph the digraph the algorithm will run on.
|
|
alpar@100
|
1308 |
/// \param visitor The visitor of the algorithm.
|
|
alpar@100
|
1309 |
///
|
|
alpar@209
|
1310 |
DfsVisit(const Digraph& digraph, Visitor& visitor)
|
|
alpar@100
|
1311 |
: _digraph(&digraph), _visitor(&visitor),
|
|
alpar@209
|
1312 |
_reached(0), local_reached(false) {}
|
|
alpar@209
|
1313 |
|
|
alpar@100
|
1314 |
/// \brief Destructor.
|
|
alpar@100
|
1315 |
///
|
|
alpar@100
|
1316 |
/// Destructor.
|
|
alpar@100
|
1317 |
~DfsVisit() {
|
|
alpar@100
|
1318 |
if(local_reached) delete _reached;
|
|
alpar@100
|
1319 |
}
|
|
alpar@100
|
1320 |
|
|
alpar@100
|
1321 |
/// \brief Sets the map indicating if a node is reached.
|
|
alpar@100
|
1322 |
///
|
|
alpar@100
|
1323 |
/// Sets the map indicating if a node is reached.
|
|
alpar@100
|
1324 |
/// If you don't use this function before calling \ref run(),
|
|
alpar@100
|
1325 |
/// it will allocate one. The destuctor deallocates this
|
|
alpar@100
|
1326 |
/// automatically allocated map, of course.
|
|
alpar@100
|
1327 |
/// \return <tt> (*this) </tt>
|
|
alpar@100
|
1328 |
DfsVisit &reachedMap(ReachedMap &m) {
|
|
alpar@100
|
1329 |
if(local_reached) {
|
|
alpar@209
|
1330 |
delete _reached;
|
|
alpar@209
|
1331 |
local_reached=false;
|
|
alpar@100
|
1332 |
}
|
|
alpar@100
|
1333 |
_reached = &m;
|
|
alpar@100
|
1334 |
return *this;
|
|
alpar@100
|
1335 |
}
|
|
alpar@100
|
1336 |
|
|
alpar@100
|
1337 |
public:
|
|
alpar@100
|
1338 |
/// \name Execution control
|
|
alpar@100
|
1339 |
/// The simplest way to execute the algorithm is to use
|
|
alpar@100
|
1340 |
/// one of the member functions called \c run(...).
|
|
alpar@100
|
1341 |
/// \n
|
|
alpar@100
|
1342 |
/// If you need more control on the execution,
|
|
alpar@100
|
1343 |
/// first you must call \ref init(), then you can adda source node
|
|
alpar@100
|
1344 |
/// with \ref addSource().
|
|
alpar@100
|
1345 |
/// Finally \ref start() will perform the actual path
|
|
alpar@100
|
1346 |
/// computation.
|
|
alpar@100
|
1347 |
|
|
alpar@100
|
1348 |
/// @{
|
|
alpar@100
|
1349 |
/// \brief Initializes the internal data structures.
|
|
alpar@100
|
1350 |
///
|
|
alpar@100
|
1351 |
/// Initializes the internal data structures.
|
|
alpar@100
|
1352 |
///
|
|
alpar@100
|
1353 |
void init() {
|
|
alpar@100
|
1354 |
create_maps();
|
|
alpar@100
|
1355 |
_stack.resize(countNodes(*_digraph));
|
|
alpar@100
|
1356 |
_stack_head = -1;
|
|
alpar@100
|
1357 |
for (NodeIt u(*_digraph) ; u != INVALID ; ++u) {
|
|
alpar@209
|
1358 |
_reached->set(u, false);
|
|
alpar@100
|
1359 |
}
|
|
alpar@100
|
1360 |
}
|
|
alpar@209
|
1361 |
|
|
alpar@100
|
1362 |
/// \brief Adds a new source node.
|
|
alpar@100
|
1363 |
///
|
|
alpar@100
|
1364 |
/// Adds a new source node to the set of nodes to be processed.
|
|
alpar@100
|
1365 |
void addSource(Node s) {
|
|
alpar@100
|
1366 |
if(!(*_reached)[s]) {
|
|
alpar@209
|
1367 |
_reached->set(s,true);
|
|
alpar@209
|
1368 |
_visitor->start(s);
|
|
alpar@209
|
1369 |
_visitor->reach(s);
|
|
alpar@209
|
1370 |
Arc e;
|
|
alpar@209
|
1371 |
_digraph->firstOut(e, s);
|
|
alpar@209
|
1372 |
if (e != INVALID) {
|
|
alpar@209
|
1373 |
_stack[++_stack_head] = e;
|
|
alpar@209
|
1374 |
} else {
|
|
alpar@209
|
1375 |
_visitor->leave(s);
|
|
alpar@209
|
1376 |
}
|
|
alpar@209
|
1377 |
}
|
|
alpar@100
|
1378 |
}
|
|
alpar@209
|
1379 |
|
|
alpar@100
|
1380 |
/// \brief Processes the next arc.
|
|
alpar@100
|
1381 |
///
|
|
alpar@100
|
1382 |
/// Processes the next arc.
|
|
alpar@100
|
1383 |
///
|
|
alpar@100
|
1384 |
/// \return The processed arc.
|
|
alpar@100
|
1385 |
///
|
|
alpar@100
|
1386 |
/// \pre The stack must not be empty!
|
|
alpar@209
|
1387 |
Arc processNextArc() {
|
|
alpar@100
|
1388 |
Arc e = _stack[_stack_head];
|
|
alpar@100
|
1389 |
Node m = _digraph->target(e);
|
|
alpar@100
|
1390 |
if(!(*_reached)[m]) {
|
|
alpar@209
|
1391 |
_visitor->discover(e);
|
|
alpar@209
|
1392 |
_visitor->reach(m);
|
|
alpar@209
|
1393 |
_reached->set(m, true);
|
|
alpar@209
|
1394 |
_digraph->firstOut(_stack[++_stack_head], m);
|
|
alpar@100
|
1395 |
} else {
|
|
alpar@209
|
1396 |
_visitor->examine(e);
|
|
alpar@209
|
1397 |
m = _digraph->source(e);
|
|
alpar@209
|
1398 |
_digraph->nextOut(_stack[_stack_head]);
|
|
alpar@100
|
1399 |
}
|
|
alpar@100
|
1400 |
while (_stack_head>=0 && _stack[_stack_head] == INVALID) {
|
|
alpar@209
|
1401 |
_visitor->leave(m);
|
|
alpar@209
|
1402 |
--_stack_head;
|
|
alpar@209
|
1403 |
if (_stack_head >= 0) {
|
|
alpar@209
|
1404 |
_visitor->backtrack(_stack[_stack_head]);
|
|
alpar@209
|
1405 |
m = _digraph->source(_stack[_stack_head]);
|
|
alpar@209
|
1406 |
_digraph->nextOut(_stack[_stack_head]);
|
|
alpar@209
|
1407 |
} else {
|
|
alpar@209
|
1408 |
_visitor->stop(m);
|
|
alpar@209
|
1409 |
}
|
|
alpar@100
|
1410 |
}
|
|
alpar@100
|
1411 |
return e;
|
|
alpar@100
|
1412 |
}
|
|
alpar@100
|
1413 |
|
|
alpar@100
|
1414 |
/// \brief Next arc to be processed.
|
|
alpar@100
|
1415 |
///
|
|
alpar@100
|
1416 |
/// Next arc to be processed.
|
|
alpar@100
|
1417 |
///
|
|
alpar@100
|
1418 |
/// \return The next arc to be processed or INVALID if the stack is
|
|
alpar@100
|
1419 |
/// empty.
|
|
alpar@209
|
1420 |
Arc nextArc() {
|
|
alpar@100
|
1421 |
return _stack_head >= 0 ? _stack[_stack_head] : INVALID;
|
|
alpar@100
|
1422 |
}
|
|
alpar@100
|
1423 |
|
|
alpar@100
|
1424 |
/// \brief Returns \c false if there are nodes
|
|
alpar@100
|
1425 |
/// to be processed in the queue
|
|
alpar@100
|
1426 |
///
|
|
alpar@100
|
1427 |
/// Returns \c false if there are nodes
|
|
alpar@100
|
1428 |
/// to be processed in the queue
|
|
alpar@100
|
1429 |
bool emptyQueue() { return _stack_head < 0; }
|
|
alpar@100
|
1430 |
|
|
alpar@100
|
1431 |
/// \brief Returns the number of the nodes to be processed.
|
|
alpar@100
|
1432 |
///
|
|
alpar@100
|
1433 |
/// Returns the number of the nodes to be processed in the queue.
|
|
alpar@100
|
1434 |
int queueSize() { return _stack_head + 1; }
|
|
alpar@209
|
1435 |
|
|
alpar@100
|
1436 |
/// \brief Executes the algorithm.
|
|
alpar@100
|
1437 |
///
|
|
alpar@100
|
1438 |
/// Executes the algorithm.
|
|
alpar@100
|
1439 |
///
|
|
alpar@100
|
1440 |
/// \pre init() must be called and at least one node should be added
|
|
alpar@100
|
1441 |
/// with addSource() before using this function.
|
|
alpar@100
|
1442 |
void start() {
|
|
alpar@100
|
1443 |
while ( !emptyQueue() ) processNextArc();
|
|
alpar@100
|
1444 |
}
|
|
alpar@209
|
1445 |
|
|
alpar@100
|
1446 |
/// \brief Executes the algorithm until \c dest is reached.
|
|
alpar@100
|
1447 |
///
|
|
alpar@100
|
1448 |
/// Executes the algorithm until \c dest is reached.
|
|
alpar@100
|
1449 |
///
|
|
alpar@100
|
1450 |
/// \pre init() must be called and at least one node should be added
|
|
alpar@100
|
1451 |
/// with addSource() before using this function.
|
|
alpar@100
|
1452 |
void start(Node dest) {
|
|
alpar@209
|
1453 |
while ( !emptyQueue() && _digraph->target(_stack[_stack_head]) != dest )
|
|
alpar@209
|
1454 |
processNextArc();
|
|
alpar@100
|
1455 |
}
|
|
alpar@209
|
1456 |
|
|
alpar@100
|
1457 |
/// \brief Executes the algorithm until a condition is met.
|
|
alpar@100
|
1458 |
///
|
|
alpar@100
|
1459 |
/// Executes the algorithm until a condition is met.
|
|
alpar@100
|
1460 |
///
|
|
alpar@100
|
1461 |
/// \pre init() must be called and at least one node should be added
|
|
alpar@100
|
1462 |
/// with addSource() before using this function.
|
|
alpar@100
|
1463 |
///
|
|
alpar@100
|
1464 |
/// \param em must be a bool (or convertible) arc map. The algorithm
|
|
alpar@100
|
1465 |
/// will stop when it reaches an arc \c e with <tt>em[e]</tt> true.
|
|
alpar@100
|
1466 |
///
|
|
alpar@100
|
1467 |
///\return The reached arc \c e with <tt>em[e]</tt> true or
|
|
alpar@100
|
1468 |
///\c INVALID if no such arc was found.
|
|
alpar@100
|
1469 |
///
|
|
alpar@100
|
1470 |
/// \warning Contrary to \ref Bfs and \ref Dijkstra, \c em is an arc map,
|
|
alpar@100
|
1471 |
/// not a node map.
|
|
alpar@100
|
1472 |
template <typename EM>
|
|
alpar@100
|
1473 |
Arc start(const EM &em) {
|
|
alpar@100
|
1474 |
while ( !emptyQueue() && !em[_stack[_stack_head]] )
|
|
alpar@100
|
1475 |
processNextArc();
|
|
alpar@100
|
1476 |
return emptyQueue() ? INVALID : _stack[_stack_head];
|
|
alpar@100
|
1477 |
}
|
|
alpar@100
|
1478 |
|
|
alpar@100
|
1479 |
/// \brief Runs %DFSVisit algorithm from node \c s.
|
|
alpar@100
|
1480 |
///
|
|
alpar@100
|
1481 |
/// This method runs the %DFS algorithm from a root node \c s.
|
|
alpar@100
|
1482 |
/// \note d.run(s) is just a shortcut of the following code.
|
|
alpar@100
|
1483 |
///\code
|
|
alpar@100
|
1484 |
/// d.init();
|
|
alpar@100
|
1485 |
/// d.addSource(s);
|
|
alpar@100
|
1486 |
/// d.start();
|
|
alpar@100
|
1487 |
///\endcode
|
|
alpar@100
|
1488 |
void run(Node s) {
|
|
alpar@100
|
1489 |
init();
|
|
alpar@100
|
1490 |
addSource(s);
|
|
alpar@100
|
1491 |
start();
|
|
alpar@100
|
1492 |
}
|
|
alpar@100
|
1493 |
|
|
alpar@100
|
1494 |
/// \brief Runs %DFSVisit algorithm to visit all nodes in the digraph.
|
|
alpar@209
|
1495 |
|
|
alpar@100
|
1496 |
/// This method runs the %DFS algorithm in order to
|
|
alpar@100
|
1497 |
/// compute the %DFS path to each node. The algorithm computes
|
|
alpar@100
|
1498 |
/// - The %DFS tree.
|
|
alpar@100
|
1499 |
/// - The distance of each node from the root in the %DFS tree.
|
|
alpar@100
|
1500 |
///
|
|
alpar@100
|
1501 |
///\note d.run() is just a shortcut of the following code.
|
|
alpar@100
|
1502 |
///\code
|
|
alpar@100
|
1503 |
/// d.init();
|
|
alpar@100
|
1504 |
/// for (NodeIt it(digraph); it != INVALID; ++it) {
|
|
alpar@100
|
1505 |
/// if (!d.reached(it)) {
|
|
alpar@100
|
1506 |
/// d.addSource(it);
|
|
alpar@100
|
1507 |
/// d.start();
|
|
alpar@100
|
1508 |
/// }
|
|
alpar@100
|
1509 |
/// }
|
|
alpar@100
|
1510 |
///\endcode
|
|
alpar@100
|
1511 |
void run() {
|
|
alpar@100
|
1512 |
init();
|
|
alpar@100
|
1513 |
for (NodeIt it(*_digraph); it != INVALID; ++it) {
|
|
alpar@100
|
1514 |
if (!reached(it)) {
|
|
alpar@100
|
1515 |
addSource(it);
|
|
alpar@100
|
1516 |
start();
|
|
alpar@100
|
1517 |
}
|
|
alpar@100
|
1518 |
}
|
|
alpar@100
|
1519 |
}
|
|
alpar@100
|
1520 |
///@}
|
|
alpar@100
|
1521 |
|
|
alpar@100
|
1522 |
/// \name Query Functions
|
|
alpar@100
|
1523 |
/// The result of the %DFS algorithm can be obtained using these
|
|
alpar@100
|
1524 |
/// functions.\n
|
|
alpar@100
|
1525 |
/// Before the use of these functions,
|
|
alpar@100
|
1526 |
/// either run() or start() must be called.
|
|
alpar@100
|
1527 |
///@{
|
|
alpar@100
|
1528 |
/// \brief Checks if a node is reachable from the root.
|
|
alpar@100
|
1529 |
///
|
|
alpar@100
|
1530 |
/// Returns \c true if \c v is reachable from the root(s).
|
|
alpar@100
|
1531 |
/// \warning The source nodes are inditated as unreachable.
|
|
alpar@100
|
1532 |
/// \pre Either \ref run() or \ref start()
|
|
alpar@100
|
1533 |
/// must be called before using this function.
|
|
alpar@100
|
1534 |
///
|
|
alpar@100
|
1535 |
bool reached(Node v) { return (*_reached)[v]; }
|
|
alpar@100
|
1536 |
///@}
|
|
alpar@100
|
1537 |
};
|
|
alpar@100
|
1538 |
|
|
alpar@100
|
1539 |
|
|
alpar@100
|
1540 |
} //END OF NAMESPACE LEMON
|
|
alpar@100
|
1541 |
|
|
alpar@100
|
1542 |
#endif
|
|
alpar@100
|
1543 |
|