72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
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/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file pointerToVoid.h
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* @author drose
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* @date 2004-09-27
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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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#include "memoryBase.h"
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#include "atomicAdjust.h"
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#include <algorithm>
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/**
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* This is the non-template part of the base class for PointerTo and
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* ConstPointerTo. It is necessary so we can keep a pointer to a non-template
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* class within the ReferenceCount object, to implement weak reference
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* pointers--we need to have something to clean up when the ReferenceCount
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* 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_PANDA_EXPRESS PointerToVoid : public MemoryBase {
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protected:
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constexpr PointerToVoid() noexcept = default;
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//INLINE ~PointerToVoid();
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private:
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PointerToVoid(const PointerToVoid ©) = delete;
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PUBLISHED:
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constexpr 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 they're
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// 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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INLINE bool operator == (const PointerToVoid &other) const;
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INLINE bool operator != (const PointerToVoid &other) const;
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INLINE void swap(PointerToVoid &other) noexcept;
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protected:
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// Within the PointerToVoid class, we only store a void pointer. This is
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// actually the (To *) pointer that is typecast to (void *) from the derived
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// template classes.
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// It is tempting to try to store a (ReferenceCount *) pointer here, but
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// this is not useful because it prohibits defining, say, PT(PandaNode), or
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// a PointerTo any class that inherits virtually from ReferenceCount. (You
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// can't downcast past a virtual inheritance level, but you can always
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// cross-cast from a void pointer.)
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AtomicAdjust::Pointer _void_ptr = nullptr;
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};
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#include "pointerToVoid.I"
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#endif
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