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/*=========================================================================
Program: Visualization Toolkit
Module: vtkWeakPointerBase.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
/**
* @class vtkWeakPointerBase
* @brief Non-templated superclass for vtkWeakPointer.
*
* vtkWeakPointerBase holds a pointer to a vtkObjectBase or subclass
* instance, but it never affects the reference count of the vtkObjectBase. However,
* when the vtkObjectBase referred to is destroyed, the pointer gets initialized to
* nullptr, thus avoid dangling references.
*/
#ifndef vtkWeakPointerBase_h
#define vtkWeakPointerBase_h
#include "vtkCommonCoreModule.h" // For export macro
#include "vtkObjectBase.h"
VTK_ABI_NAMESPACE_BEGIN
class vtkObjectBaseToWeakPointerBaseFriendship;
class VTKCOMMONCORE_EXPORT vtkWeakPointerBase
{
public:
/**
* Initialize smart pointer to nullptr.
*/
vtkWeakPointerBase() noexcept
: Object(nullptr)
{
}
/**
* Initialize smart pointer to given object.
*/
vtkWeakPointerBase(vtkObjectBase* r);
/**
* Copy r's data object into the new weak pointer.
*/
vtkWeakPointerBase(const vtkWeakPointerBase& r);
/**
* Move r's object into the new weak pointer, setting r to nullptr.
*/
vtkWeakPointerBase(vtkWeakPointerBase&& r) noexcept;
/**
* Destroy smart pointer.
*/
~vtkWeakPointerBase();
///@{
/**
* Assign object to reference. This removes any reference to an old
* object.
*/
vtkWeakPointerBase& operator=(vtkObjectBase* r);
vtkWeakPointerBase& operator=(const vtkWeakPointerBase& r);
vtkWeakPointerBase& operator=(vtkWeakPointerBase&& r) noexcept;
///@}
/**
* Get the contained pointer.
*/
vtkObjectBase* GetPointer() const
{
// Inline implementation so smart pointer comparisons can be fully
// inlined.
return this->Object;
}
private:
friend class vtkObjectBaseToWeakPointerBaseFriendship;
protected:
// Initialize weak pointer to given object.
class NoReference
{
};
vtkWeakPointerBase(vtkObjectBase* r, const NoReference&);
// Pointer to the actual object.
vtkObjectBase* Object;
};
//----------------------------------------------------------------------------
#define VTK_WEAK_POINTER_BASE_DEFINE_OPERATOR(op) \
inline bool operator op(const vtkWeakPointerBase& l, const vtkWeakPointerBase& r) \
{ \
return (static_cast<void*>(l.GetPointer()) op static_cast<void*>(r.GetPointer())); \
} \
inline bool operator op(vtkObjectBase* l, const vtkWeakPointerBase& r) \
{ \
return (static_cast<void*>(l) op static_cast<void*>(r.GetPointer())); \
} \
inline bool operator op(const vtkWeakPointerBase& l, vtkObjectBase* r) \
{ \
return (static_cast<void*>(l.GetPointer()) op static_cast<void*>(r)); \
}
/**
* Compare smart pointer values.
*/
VTK_WEAK_POINTER_BASE_DEFINE_OPERATOR(==)
VTK_WEAK_POINTER_BASE_DEFINE_OPERATOR(!=)
VTK_WEAK_POINTER_BASE_DEFINE_OPERATOR(<)
VTK_WEAK_POINTER_BASE_DEFINE_OPERATOR(<=)
VTK_WEAK_POINTER_BASE_DEFINE_OPERATOR(>)
VTK_WEAK_POINTER_BASE_DEFINE_OPERATOR(>=)
#undef VTK_WEAK_POINTER_BASE_DEFINE_OPERATOR
/**
* Streaming operator to print smart pointer like regular pointers.
*/
VTKCOMMONCORE_EXPORT ostream& operator<<(ostream& os, const vtkWeakPointerBase& p);
VTK_ABI_NAMESPACE_END
#endif
// VTK-HeaderTest-Exclude: vtkWeakPointerBase.h
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