71 lines
2.4 KiB
C++
71 lines
2.4 KiB
C++
// Filename: pointerToVoid.h
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// Created by: drose (27Sep04)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) 2001 - 2004, Disney Enterprises, Inc. All rights reserved
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//
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// All use of this software is subject to the terms of the Panda 3d
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// Software license. You should have received a copy of this license
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// along with this source code; you will also find a current copy of
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// the license at http://etc.cmu.edu/panda3d/docs/license/ .
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//
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// To contact the maintainers of this program write to
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// panda3d-general@lists.sourceforge.net .
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//
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////////////////////////////////////////////////////////////////////
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#ifndef POINTERTOVOID_H
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#define POINTERTOVOID_H
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#include "pandabase.h"
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#include "pnotify.h"
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////////////////////////////////////////////////////////////////////
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// Class : PointerToVoid
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// Description : This is the non-template part of the base class for
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// PointerTo and ConstPointerTo. It is necessary so we
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// can keep a pointer to a non-template class within the
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// ReferenceCount object, to implement weak reference
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// pointers--we need to have something to clean up when
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// the ReferenceCount object destructs.
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//
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// This is the base class for PointerToBase<T>.
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////////////////////////////////////////////////////////////////////
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class EXPCL_PANDAEXPRESS PointerToVoid {
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protected:
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INLINE PointerToVoid();
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INLINE ~PointerToVoid();
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private:
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INLINE PointerToVoid(const PointerToVoid ©);
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PUBLISHED:
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INLINE bool is_null() const;
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INLINE size_t get_hash() const;
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public:
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// These comparison functions are common to all things PointerTo, so
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// they're defined up here.
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INLINE bool operator < (const void *other) const;
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INLINE bool operator < (const PointerToVoid &other) const;
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protected:
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// Within the PointerToVoid class, we only store a void pointer.
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// This is actually the (To *) pointer that is typecast to (void *)
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// from the derived template classes.
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// It is tempting to try to store a (ReferenceCount *) pointer here,
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// but this is not useful because it prohibits defining, say,
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// PT(PandaNode), or a PointerTo any class that inherits virtually
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// from ReferenceCount. (You can't downcast past a virtual
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// inheritance level, but you can always cross-cast from a void
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// pointer.)
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void *_void_ptr;
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};
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#include "pointerToVoid.I"
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#endif
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