mirror of https://github.com/CGAL/cgal
93 lines
1.8 KiB
C++
93 lines
1.8 KiB
C++
// ======================================================================
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//
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// Copyright (c) 1999 The CGAL Consortium
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//
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// This software and related documentation is part of an INTERNAL release
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// of the Computational Geometry Algorithms Library (CGAL). It is not
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// intended for general use.
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//
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// ----------------------------------------------------------------------
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//
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// release :
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// release_date :
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//
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// file : Handle.h
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// package : Kernel_basic
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// revision : $Revision$
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// revision_date : $Date$
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// author(s) :
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//
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// coordinator : MPI, Saarbruecken (<Stefan.Schirra@mpi-sb.mpg.de>)
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// ======================================================================
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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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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_kernel_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_kernel_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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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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template < class T >
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inline
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bool
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identical(const T &t1, const T &t2)
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{ return id(t1) == id(t2); }
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CGAL_END_NAMESPACE
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#endif // CGAL_HANDLE_H
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