mirror of https://github.com/CGAL/cgal
120 lines
2.2 KiB
C++
120 lines
2.2 KiB
C++
// ======================================================================
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//
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// Copyright (c) 2000 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 : include/CGAL/Object.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) : Stefan Schirra
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// Andreas Fabri
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// Geert-Jan Giezeman
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// Michael Seel
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// Sylvain Pion
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//
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// coordinator : MPI Saarbruecken, Germany
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//
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// ======================================================================
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#ifndef CGAL_OBJECT_H
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#define CGAL_OBJECT_H
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#include <CGAL/Handle_for_virtual.h>
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CGAL_BEGIN_NAMESPACE
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template <class T>
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class Wrapper : public Ref_counted_virtual
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{
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public:
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Wrapper(const T& object) : _object(object) {}
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Wrapper() {}
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operator T() const { return _object; }
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~Wrapper() {}
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private:
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T _object;
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};
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class Object
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: public Handle_for_virtual<Ref_counted_virtual>
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{
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struct empty{};
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typedef Handle_for_virtual<Ref_counted_virtual> base;
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public:
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struct private_tag{};
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Object()
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{
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initialize_with(Wrapper<empty>());
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}
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template <class T>
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Object(const T&t, private_tag)
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{
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initialize_with(Wrapper<T>(t));
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}
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template <class T>
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bool assign(T &t) const
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{
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#ifdef _MSC_VER
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try {
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#endif
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const Wrapper<T> *wp = dynamic_cast<const Wrapper<T> *>(Ptr());
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if (wp == NULL)
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return false;
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t = *wp;
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#ifdef _MSC_VER
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}
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catch (...) {
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std::cerr << "ERROR : YOUR COMPILER MUST SUPPORT RTTI" << std::endl;
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abort();
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}
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#endif
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return true;
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}
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bool
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is_empty() const
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{
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empty E;
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return assign(E);
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}
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};
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template <class T>
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inline
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Object
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make_object(const T& t)
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{
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return Object(t, Object::private_tag());
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}
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template <class T>
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inline
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bool
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assign(T& t, const Object& o)
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{
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return o.assign(t);
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}
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CGAL_END_NAMESPACE
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#endif // CGAL_OBJECT_H
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