96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
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// Copyright (c) 1999
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// Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland),
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// INRIA Sophia-Antipolis (France),
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// Max-Planck-Institute Saarbruecken (Germany),
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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; either version 3 of the License,
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// or (at your option) any later version.
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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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// SPDX-License-Identifier: LGPL-3.0+
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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 <cstddef>
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#include <CGAL/Handle_for.h>
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#include <CGAL/assertions.h>
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namespace CGAL {
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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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typedef std::ptrdiff_t Id_type ;
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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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Id_type id() const { return PTR - static_cast<Rep*>(0); }
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bool identical(const Handle& h) const { return PTR == h.PTR; }
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protected:
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Rep* PTR;
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};
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//inline Handle::Id_type id(const Handle& x) { return x.id() ; }
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inline bool identical(const Handle &h1, const Handle &h2) { return h1.identical(h2); }
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} //namespace CGAL
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#endif // CGAL_HANDLE_H
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