1st revision: adaptor from Ccb_circulator to iterator of x-monotone curves

Packages/Boolean_set_operations_2/include/CGAL/Boolean_set_operations_2/Ccb_curve_iterator.h

@@ -0,0 +1,100 @@
+
+#ifndef CGAL_CCB_CURVE_ITERATOR_H
+#define CGAL_CCB_CURVE_ITERATOR_H
+
+CGAL_BEGIN_NAMESPACE
+
+ /*! \class
+    * A circulator adapter that iterates over all curves in a CCB.
+    */
+    template <class Arrangement_>
+   class Ccb_curve_iterator
+   {
+   public:
+
+     typedef Arrangement_                            Arrangement;
+     typedef typename Arrangement::Traits_2          Traits;
+     typedef Ccb_curve_iterator<Arrangement>         Self;
+     typedef typename Arrangement::Ccb_halfedge_const_circulator
+                                                     Ccb_halfedge_const_circulator;
+     typedef typename Traits::X_monotone_curve_2     value_type;
+     typedef std::forward_iterator_tag               iterator_category;
+     typedef const value_type&                       reference;
+     typedef const value_type*                       pointer;
+     typedef std::size_t                             difference_type;
+
+   private:
+
+     Ccb_halfedge_const_circulator    _first;    // The first halfedge.
+     Ccb_halfedge_const_circulator    _circ;     // The current circulator.
+     bool                       _done;     // Indicates whether we completed
+                                           // a full traversal of the CCB.
+
+   public:
+
+     /*! Default constructor. */
+     Ccb_curve_iterator () :
+       _done (true)
+     {}
+
+     /*!
+      * Constructor from a circulator.
+      * \param circ A circulator for the first halfedge in the CCB.
+      * \param done (true) in order to create a past-the-end iterator.
+      */
+     Ccb_curve_iterator (Ccb_halfedge_const_circulator circ,
+                         bool done = false) :
+       _first (circ),
+       _circ (circ),
+       _done (done)
+     {}
+
+     /*! Dereference operators. */
+     reference operator* () const
+     {
+       return (_circ->curve());
+     }
+
+     pointer operator-> () const
+     {
+       return (&(_circ->curve()));
+     }
+
+     /*! Equality operators.*/
+     bool operator== (const Self& it) const
+     {
+       return (_done == it._done && _circ == it._circ);
+     }
+
+     bool operator!= (const Self& it) const
+     {
+       return (_done != it._done || _circ != it._circ);
+     }
+
+     /*! Increment operators. */
+     Self& operator++ ()
+     {
+       CGAL_assertion(!_done);
+      
+      --_circ;
+
+      if (_circ == _first)
+        _done = true;
+      
+
+       return (*this);
+     }
+
+     Self operator++ (int )
+     {
+       Self   temp = *this;
+       ++(*this);
+       return (temp);
+     }
+
+   };
+
+
+CGAL_END_NAMESPACE
+
+#endif