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/*=========================================================================
Program: Visualization Toolkit
Module: vtkSmartPointerBase.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.
=========================================================================*/
// .NAME vtkSmartPointerBase - Non-templated superclass for vtkSmartPointer.
// .SECTION Description
// vtkSmartPointerBase holds a pointer to a vtkObjectBase or subclass
// instance and performs one Register/UnRegister pair. This is useful
// for storing VTK objects in STL containers. This class is not
// intended to be used directly. Instead, use the vtkSmartPointer
// class template to automatically perform proper cast operations.
#ifndef __vtkSmartPointerBase_h
#define __vtkSmartPointerBase_h
#include "vtkObjectBase.h"
class VTK_COMMON_EXPORT vtkSmartPointerBase
{
public:
// Description:
// Initialize smart pointer to NULL.
vtkSmartPointerBase();
// Description:
// Initialize smart pointer to given object.
vtkSmartPointerBase(vtkObjectBase* r);
// Description:
// Initialize smart pointer with a new reference to the same object
// referenced by given smart pointer.
vtkSmartPointerBase(const vtkSmartPointerBase& r);
// Description:
// Destroy smart pointer and remove the reference to its object.
~vtkSmartPointerBase();
// Description:
// Assign object to reference. This removes any reference to an old
// object.
vtkSmartPointerBase& operator=(vtkObjectBase* r);
vtkSmartPointerBase& operator=(const vtkSmartPointerBase& r);
// Description:
// Get the contained pointer.
vtkObjectBase* GetPointer() const
{
// Inline implementation so smart pointer comparisons can be fully
// inlined.
return this->Object;
}
// Description:
// Report the reference held by the smart pointer to a collector.
void Report(vtkGarbageCollector* collector, const char* desc);
protected:
// Initialize smart pointer to given object, but do not increment
// reference count. The destructor will still decrement the count.
// This effectively makes it an auto-ptr.
class NoReference {};
vtkSmartPointerBase(vtkObjectBase* r, const NoReference&);
// Pointer to the actual object.
vtkObjectBase* Object;
private:
// Internal utility methods.
void Swap(vtkSmartPointerBase& r);
void Register();
};
//----------------------------------------------------------------------------
// Need to use vtkstd_bool type because std: :less requires bool return
// type from operators. This example should not be used to justify
// using bool elsewhere in VTK.
#define VTK_SMART_POINTER_BASE_DEFINE_OPERATOR(op) \
inline vtkstd_bool \
operator op (const vtkSmartPointerBase& l, const vtkSmartPointerBase& r) \
{ \
return (static_cast<void*>(l.GetPointer()) op \
static_cast<void*>(r.GetPointer())); \
} \
inline vtkstd_bool \
operator op (vtkObjectBase* l, const vtkSmartPointerBase& r) \
{ \
return (static_cast<void*>(l) op static_cast<void*>(r.GetPointer())); \
} \
inline vtkstd_bool \
operator op (const vtkSmartPointerBase& l, vtkObjectBase* r) \
{ \
return (static_cast<void*>(l.GetPointer()) op static_cast<void*>(r)); \
}
// Description:
// Compare smart pointer values.
VTK_SMART_POINTER_BASE_DEFINE_OPERATOR(==)
VTK_SMART_POINTER_BASE_DEFINE_OPERATOR(!=)
VTK_SMART_POINTER_BASE_DEFINE_OPERATOR(<)
VTK_SMART_POINTER_BASE_DEFINE_OPERATOR(<=)
VTK_SMART_POINTER_BASE_DEFINE_OPERATOR(>)
VTK_SMART_POINTER_BASE_DEFINE_OPERATOR(>=)
#undef VTK_SMART_POINTER_BASE_DEFINE_OPERATOR
// Description:
// Streaming operator to print smart pointer like regular pointers.
VTK_COMMON_EXPORT ostream& operator << (ostream& os,
const vtkSmartPointerBase& p);
#endif
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