diff -r dbaa96cc1013 -r 4f754b4cf82b lemon/bits/path_dump.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lemon/bits/path_dump.h	Thu Feb 07 21:37:07 2008 +0000
@@ -0,0 +1,174 @@
+/* -*- C++ -*-
+ *
+ * This file is a part of LEMON, a generic C++ optimization library
+ *
+ * Copyright (C) 2003-2008
+ * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
+ * (Egervary Research Group on Combinatorial Optimization, EGRES).
+ *
+ * Permission to use, modify and distribute this software is granted
+ * provided that this copyright notice appears in all copies. For
+ * precise terms see the accompanying LICENSE file.
+ *
+ * This software is provided "AS IS" with no warranty of any kind,
+ * express or implied, and with no claim as to its suitability for any
+ * purpose.
+ *
+ */
+
+#ifndef LEMON_BITS_PRED_MAP_PATH_H
+#define LEMON_BITS_PRED_MAP_PATH_H
+
+namespace lemon {
+
+  template <typename _Digraph, typename _PredMap>
+  class PredMapPath {
+  public:
+    typedef True RevPathTag;
+
+    typedef _Digraph Digraph;
+    typedef typename Digraph::Arc Arc;
+    typedef _PredMap PredMap;
+
+    PredMapPath(const Digraph& _digraph, const PredMap& _predMap,
+                typename Digraph::Node _target)
+      : digraph(_digraph), predMap(_predMap), target(_target) {}
+
+    int length() const {
+      int len = 0;
+      typename Digraph::Node node = target;
+      typename Digraph::Arc arc;
+      while ((arc = predMap[node]) != INVALID) {
+        node = digraph.source(arc);
+        ++len;
+      }
+      return len;
+    }
+
+    bool empty() const {
+      return predMap[target] != INVALID;
+    }
+
+    class RevArcIt {
+    public:
+      RevArcIt() {}
+      RevArcIt(Invalid) : path(0), current(INVALID) {}
+      RevArcIt(const PredMapPath& _path) 
+        : path(&_path), current(_path.target) {
+        if (path->predMap[current] == INVALID) current = INVALID;
+      }
+
+      operator const typename Digraph::Arc() const {
+        return path->predMap[current];
+      }
+
+      RevArcIt& operator++() {
+        current = path->digraph.source(path->predMap[current]);
+        if (path->predMap[current] == INVALID) current = INVALID;
+        return *this;
+      }
+
+      bool operator==(const RevArcIt& e) const { 
+        return current == e.current; 
+      }
+
+      bool operator!=(const RevArcIt& e) const {
+        return current != e.current; 
+      }
+
+      bool operator<(const RevArcIt& e) const { 
+        return current < e.current; 
+      }
+      
+    private:
+      const PredMapPath* path;
+      typename Digraph::Node current;
+    };
+
+  private:
+    const Digraph& digraph;
+    const PredMap& predMap;
+    typename Digraph::Node target;
+  };
+
+
+  template <typename _Digraph, typename _PredMatrixMap>
+  class PredMatrixMapPath {
+  public:
+    typedef True RevPathTag;
+
+    typedef _Digraph Digraph;
+    typedef typename Digraph::Arc Arc;
+    typedef _PredMatrixMap PredMatrixMap;
+
+    PredMatrixMapPath(const Digraph& _digraph, 
+                      const PredMatrixMap& _predMatrixMap,
+                      typename Digraph::Node _source, 
+                      typename Digraph::Node _target)
+      : digraph(_digraph), predMatrixMap(_predMatrixMap), 
+        source(_source), target(_target) {}
+
+    int length() const {
+      int len = 0;
+      typename Digraph::Node node = target;
+      typename Digraph::Arc arc;
+      while ((arc = predMatrixMap(source, node)) != INVALID) {
+        node = digraph.source(arc);
+        ++len;
+      }
+      return len;
+    }
+
+    bool empty() const {
+      return source != target;
+    }
+
+    class RevArcIt {
+    public:
+      RevArcIt() {}
+      RevArcIt(Invalid) : path(0), current(INVALID) {}
+      RevArcIt(const PredMatrixMapPath& _path) 
+        : path(&_path), current(_path.target) {
+        if (path->predMatrixMap(path->source, current) == INVALID) 
+          current = INVALID;
+      }
+
+      operator const typename Digraph::Arc() const {
+        return path->predMatrixMap(path->source, current);
+      }
+
+      RevArcIt& operator++() {
+        current = 
+          path->digraph.source(path->predMatrixMap(path->source, current));
+        if (path->predMatrixMap(path->source, current) == INVALID) 
+          current = INVALID;
+        return *this;
+      }
+
+      bool operator==(const RevArcIt& e) const { 
+        return current == e.current; 
+      }
+
+      bool operator!=(const RevArcIt& e) const {
+        return current != e.current; 
+      }
+
+      bool operator<(const RevArcIt& e) const { 
+        return current < e.current; 
+      }
+      
+    private:
+      const PredMatrixMapPath* path;
+      typename Digraph::Node current;
+    };
+
+  private:
+    const Digraph& digraph;
+    const PredMatrixMap& predMatrixMap;
+    typename Digraph::Node source;
+    typename Digraph::Node target;
+  };
+
+}
+
+#endif