mirror of https://github.com/CGAL/cgal
127 lines
2.9 KiB
C++
127 lines
2.9 KiB
C++
// Copyright (c) 2005 Stanford University (USA).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; version 2.1 of the License.
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// See the file LICENSE.LGPL distributed with CGAL.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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//
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//
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// Author(s) : Daniel Russel <drussel@alumni.princeton.edu>
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#ifndef CGAL_REF_COUNTED_H
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#define CGAL_REF_COUNTED_H
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#include <CGAL/Kinetic/basic.h>
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#include <boost/intrusive_ptr.hpp>
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#include <boost/utility.hpp>
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//#define NEW_REF_COUNTED
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CGAL_KINETIC_BEGIN_INTERNAL_NAMESPACE
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class Ref_counted_base;
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void intrusive_ptr_add_ref(const Ref_counted_base *t);
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void intrusive_ptr_release(const Ref_counted_base *t);
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class Ref_counted_base: boost::noncopyable
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{
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typedef Ref_counted_base This;
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/*Ref_counted_base(const Ref_counted_base&) : reference_count_(0) {
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std::cerr << "Copy constructor called. Why?" << std::endl;
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}*/
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/*Ref_counted_base operator=(const Ref_counted_base&) const
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{
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std::cerr << "Assignment called. Why?" << std::endl;
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return *this;
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}*/
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public:
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Ref_counted_base() : reference_count_(0) {}
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void write(std::ostream &out) const
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{
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out << "(" << reference_count_ << ")";
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}
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bool is_referenced() const
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{
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return reference_count_ != 0;
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}
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virtual ~Ref_counted_base() {
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CGAL_assertion(reference_count_==0);
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}
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friend void intrusive_ptr_release(const This *t);
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friend void intrusive_ptr_add_ref(const This *t);
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unsigned int reference_count() const {return reference_count_;}
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void new_ref() const { ++reference_count_; }
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void delete_ref() const
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{
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CGAL_precondition(reference_count_!=0);
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--reference_count_;
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}
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mutable unsigned int reference_count_;
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};
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inline void intrusive_ptr_add_ref(const Ref_counted_base *t)
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{
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t->new_ref();
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}
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inline void intrusive_ptr_release(const Ref_counted_base *t)
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{
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t->delete_ref();
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if (t->reference_count() == 0) {
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delete t;
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}
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}
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CGAL_KINETIC_END_INTERNAL_NAMESPACE
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CGAL_KINETIC_BEGIN_NAMESPACE
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template <class T>
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class Ref_counted: public internal::Ref_counted_base
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{
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typedef internal::Ref_counted_base P;
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typedef Ref_counted<T> This;
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This operator=(const This &) {
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this_should_not_compile(T());
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assert(0);
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return *this;
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}
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Ref_counted(const Ref_counted&o) {
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this_should_not_compile(T());
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assert(0);
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}
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public:
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Ref_counted() {
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}
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typedef typename boost::intrusive_ptr<T> Handle;
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typedef typename boost::intrusive_ptr<const T> Const_handle;
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};
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CGAL_KINETIC_END_NAMESPACE
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#endif
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