mirror of https://github.com/CGAL/cgal
96 lines
2.2 KiB
C++
96 lines
2.2 KiB
C++
// Copyright (c) 1999 Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
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// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
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// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
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// and Tel-Aviv University (Israel). 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) : Sylvain Pion
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#ifndef CGAL_HANDLE_H
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#define CGAL_HANDLE_H
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#include <CGAL/Handle_for.h>
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#include <CGAL/assertions.h>
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CGAL_BEGIN_NAMESPACE
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class Rep
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{
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friend class Handle;
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protected:
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Rep() { count = 1; }
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virtual ~Rep() {}
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int count;
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};
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class Handle
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{
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public:
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Handle()
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: PTR(static_cast<Rep*>(0)) {}
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Handle(const Handle& x)
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{
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CGAL_precondition( x.PTR != static_cast<Rep*>(0) );
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PTR = x.PTR;
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PTR->count++;
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}
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~Handle()
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{
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if ( PTR && (--PTR->count == 0))
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delete PTR;
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}
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Handle&
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operator=(const Handle& x)
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{
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CGAL_precondition( x.PTR != static_cast<Rep*>(0) );
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x.PTR->count++;
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if ( PTR && (--PTR->count == 0))
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delete PTR;
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PTR = x.PTR;
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return *this;
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}
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int
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refs() const { return PTR->count; }
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friend unsigned long id(const Handle& x);
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friend bool identical(const Handle& h1, const Handle& h2);
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protected:
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Rep* PTR;
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};
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inline
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unsigned long
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id(const Handle& x)
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{ return reinterpret_cast<unsigned long>(x.PTR); }
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inline
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bool
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identical(const Handle &h1, const Handle &h2)
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{ return reinterpret_cast<unsigned long>(h1.PTR) ==
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reinterpret_cast<unsigned long>(h2.PTR); }
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CGAL_END_NAMESPACE
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#endif // CGAL_HANDLE_H
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