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// Copyright (c) 2005 Stanford University (USA).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 3 of the License,
// or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL: svn+ssh://scm.gforge.inria.fr/svn/cgal/branches/next/Kinetic_data_structures/include/CGAL/Kinetic/Ref_counted.h $
// $Id: Ref_counted.h 67093 2012-01-13 11:22:39Z lrineau $
//
//
// Author(s) : Daniel Russel <drussel@alumni.princeton.edu>
#ifndef CGAL_REF_COUNTED_H
#define CGAL_REF_COUNTED_H
#include <CGAL/Kinetic/basic.h>
#include <boost/intrusive_ptr.hpp>
#include <boost/utility.hpp>
//#define NEW_REF_COUNTED
namespace CGAL { namespace Kinetic { namespace internal {
class Ref_counted_base;
void intrusive_ptr_add_ref(const Ref_counted_base *t);
void intrusive_ptr_release(const Ref_counted_base *t);
class Ref_counted_base: boost::noncopyable
{
typedef Ref_counted_base This;
public:
Ref_counted_base() : reference_count_(0) {}
void write(std::ostream &out) const
{
out << "(" << reference_count_ << ")";
}
bool is_referenced() const
{
return reference_count_ != 0;
}
virtual ~Ref_counted_base() {
CGAL_assertion(reference_count_==0);
}
friend void intrusive_ptr_release(const This *t);
friend void intrusive_ptr_add_ref(const This *t);
unsigned int reference_count() const {return reference_count_;}
void new_ref() const { ++reference_count_; }
void delete_ref() const
{
CGAL_precondition(reference_count_!=0);
--reference_count_;
}
mutable unsigned int reference_count_;
};
inline void intrusive_ptr_add_ref(const Ref_counted_base *t)
{
t->new_ref();
}
inline void intrusive_ptr_release(const Ref_counted_base *t)
{
t->delete_ref();
if (t->reference_count() == 0) {
delete t;
}
}
struct Non_ref_counted_base{};
inline void intrusive_ptr_add_ref(const Non_ref_counted_base *)
{
}
inline void intrusive_ptr_release(const Non_ref_counted_base *)
{
}
} } } //namespace CGAL::Kinetic::internal
namespace CGAL { namespace Kinetic {
template <class T>
class Ref_counted: public internal::Ref_counted_base
{
typedef internal::Ref_counted_base P;
public:
typedef T This;
typedef typename boost::intrusive_ptr<T> Handle;
typedef typename boost::intrusive_ptr<const T> Const_handle;
};
template <class T>
struct Non_ref_counted: public internal::Non_ref_counted_base
{
typedef T This;
typedef typename boost::intrusive_ptr<T> Handle;
typedef typename boost::intrusive_ptr<const T> Const_handle;
};
} } //namespace CGAL::Kinetic
#endif
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