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// Copyright (c) 2000 Utrecht University (The Netherlands),
// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
// and Tel-Aviv University (Israel). 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; version 2.1 of the License.
// See the file LICENSE.LGPL distributed with CGAL.
//
// 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/CGAL-3.2-branch/Kernel_23/include/CGAL/Object.h $
// $Id: Object.h 28567 2006-02-16 14:30:13Z lsaboret $
//
//
// Author(s) : Stefan Schirra
// Andreas Fabri
// Geert-Jan Giezeman
// Michael Seel
// Sylvain Pion
#ifndef CGAL_OBJECT_H
#define CGAL_OBJECT_H
#include <CGAL/basic.h>
#include <CGAL/Handle_for_virtual.h>
#include <typeinfo>
CGAL_BEGIN_NAMESPACE
template <class T>
class Wrapper : public Ref_counted_virtual
{
public:
Wrapper(const T& object) : _object(object) {}
Wrapper() {}
operator T() const { return _object; }
~Wrapper() {}
virtual const std::type_info & type() const
{
return typeid(T);
}
virtual const void * object_ptr() const
{
return & _object;
}
private:
T _object;
};
class Object
: public Handle_for_virtual<Ref_counted_virtual>
{
struct empty {};
typedef Handle_for_virtual<Ref_counted_virtual> base;
public:
struct private_tag{};
Object()
{
initialize_with(Wrapper<empty>());
}
template <class T>
Object(const T&t, private_tag)
{
initialize_with(Wrapper<T>(t));
}
template <class T>
bool assign(T &t) const
{
#ifdef _MSC_VER
try {
#endif
const Wrapper<T> *wp = dynamic_cast<const Wrapper<T> *>(Ptr());
if (wp == NULL)
return false;
t = *wp;
#ifdef _MSC_VER
}
catch (...) {
std::cerr << "ERROR : YOUR COMPILER MUST SUPPORT RTTI" << std::endl;
abort();
}
#endif
return true;
}
bool
is_empty() const
{
empty E;
return assign(E);
}
const std::type_info & type() const
{
return is_empty() ? typeid(void) : Ptr()->type();
}
};
template <class T>
inline
Object
make_object(const T& t)
{
return Object(t, Object::private_tag());
}
template <class T>
inline
bool
assign(T& t, const Object& o)
{
return o.assign(t);
}
struct Bad_object_cast
: public std::bad_cast
{
virtual const char * what() const throw()
{
return "CGAL::bad_object_cast: "
"failed conversion using CGAL::object_cast";
}
};
/*
template <class T>
inline
T * object_cast(Object * o)
{
return o && o->type() == typeid(T) ? o->object_ptr() : NULL;
}
*/
template <class T>
inline
const T * object_cast(const Object * o)
{
const Wrapper<T> *wp = dynamic_cast<const Wrapper<T> *>(o->Ptr());
if (wp == NULL)
return NULL;
return static_cast<const T*>(wp->object_ptr());
// return o && o->type() == typeid(T)
// ? static_cast<const T*>(o->object_ptr())
// : NULL;
}
template <class T>
inline
T object_cast(const Object & o)
{
const T * result = object_cast<T>(&o);
if (!result)
throw Bad_object_cast();
return *result;
}
CGAL_END_NAMESPACE
#endif // CGAL_OBJECT_H
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