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// Copyright (c) 2003
// Utrecht University (The Netherlands),
// ETH Zurich (Switzerland),
// INRIA Sophia-Antipolis (France),
// Max-Planck-Institute Saarbruecken (Germany),
// and Tel-Aviv University (Israel). All rights reserved.
//
// This file is part of CGAL (www.cgal.org)
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1.1/STL_Extension/include/CGAL/Circulator_on_node.h $
// $Id: include/CGAL/Circulator_on_node.h 08b27d3db14 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s) : Michael Hoffmann <hoffmann@inf.ethz.ch>
// Lutz Kettner <kettner@mpi-sb.mpg.de>
// Sylvain Pion
#ifndef CGAL_CIRCULATOR_ON_NODE_H
#define CGAL_CIRCULATOR_ON_NODE_H 1
#include <CGAL/circulator.h>
namespace CGAL {
template < class Node,
class Next,
class Prev,
class Ref = Node&,
class Ptr = Node*,
class Ctg = Bidirectional_circulator_tag>
class Circulator_on_node {
protected:
Ptr nt; // The internal node ptr.
public:
typedef Circulator_on_node<Node,Next,Prev,Ref,Ptr,Ctg> Self;
typedef Ctg iterator_category;
typedef Node value_type;
typedef std::ptrdiff_t difference_type;
typedef std::size_t size_type;
typedef Ref reference;
typedef Ptr pointer;
// CREATION
// --------
Circulator_on_node() : nt(0) {}
Circulator_on_node( Ptr p) : nt(p) {}
// OPERATIONS Forward Category
// ---------------------------
Ptr ptr() const { return nt;}
bool operator==( std::nullptr_t p) const {
CGAL_assertion( p == 0);
CGAL_USE(p);
return ( nt == 0);
}
bool operator!=( std::nullptr_t p) const { return !(*this == p); }
bool operator==( const Self& i) const { return ( nt == i.nt); }
bool operator!=( const Self& i) const { return !(*this == i); }
Ref operator*() const { return *nt; }
Ptr operator->() const { return nt; }
Self& operator++() {
Next next;
nt = next(nt);
return *this;
}
Self operator++(int) {
Self tmp = *this;
++*this;
return tmp;
}
// OPERATIONS Bidirectional Category
// ---------------------------------
Self& operator--() {
Prev prev;
nt = prev(nt);
return *this;
}
Self operator--(int) {
Self tmp = *this;
--*this;
return tmp;
}
};
} //namespace CGAL
#endif // CGAL_CIRCULATOR_ON_NODE_H //
// EOF //
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