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vtkObjectBase.h
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vtkObjectBase.h
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkObjectBase.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 vtkObjectBase
* @brief abstract base class for most VTK objects
*
* vtkObjectBase is the base class for all reference counted classes
* in the VTK. These classes include vtkCommand classes, vtkInformationKey
* classes, and vtkObject classes.
*
* vtkObjectBase performs reference counting: objects that are
* reference counted exist as long as another object uses them. Once
* the last reference to a reference counted object is removed, the
* object will spontaneously destruct.
*
* Constructor and destructor of the subclasses of vtkObjectBase
* should be protected, so that only New() and UnRegister() actually
* call them. Debug leaks can be used to see if there are any objects
* left with nonzero reference count.
*
* @warning
* Note: Objects of subclasses of vtkObjectBase should always be
* created with the New() method and deleted with the Delete()
* method. They cannot be allocated off the stack (i.e., automatic
* objects) because the constructor is a protected method.
*
* @sa
* vtkObject vtkCommand vtkInformationKey
*/
#ifndef vtkObjectBase_h
#define vtkObjectBase_h
// Semantics around vtkDebugLeaks usage has changed. Now just call
// vtkObjectBase::InitializeObjectBase() after creating an object with New().
// The object factory methods take care of this automatically.
#define VTK_HAS_INITIALIZE_OBJECT_BASE
#include "vtkCommonCoreModule.h" // For export macro
#include "vtkFeatures.h" // for VTK_USE_MEMKIND
#include "vtkIndent.h"
#include "vtkSystemIncludes.h"
#include "vtkType.h"
#include <atomic> // For std::atomic
class vtkGarbageCollector;
class vtkGarbageCollectorToObjectBaseFriendship;
class vtkWeakPointerBase;
class vtkWeakPointerBaseToObjectBaseFriendship;
// typedefs for malloc and free compatible replacement functions
typedef void* (*vtkMallocingFunction)(size_t);
typedef void* (*vtkReallocingFunction)(void*, size_t);
typedef void (*vtkFreeingFunction)(void*);
class VTKCOMMONCORE_EXPORT vtkObjectBase
{
/**
* Return the class name as a string. This method is overridden
* in all subclasses of vtkObjectBase with the vtkTypeMacro found
* in vtkSetGet.h.
*/
virtual const char* GetClassNameInternal() const { return "vtkObjectBase"; }
public:
#ifdef VTK_WORKAROUND_WINDOWS_MANGLE
// Avoid windows name mangling.
#define GetClassNameA GetClassName
#define GetClassNameW GetClassName
#endif
/**
* Return the class name as a string.
*/
const char* GetClassName() const;
#ifdef VTK_WORKAROUND_WINDOWS_MANGLE
#undef GetClassNameW
#undef GetClassNameA
// Define possible mangled names.
const char* GetClassNameA() const;
const char* GetClassNameW() const;
#endif
/**
* Return 1 if this class type is the same type of (or a subclass of)
* the named class. Returns 0 otherwise. This method works in
* combination with vtkTypeMacro found in vtkSetGet.h.
*/
static vtkTypeBool IsTypeOf(const char* name);
/**
* Return 1 if this class is the same type of (or a subclass of)
* the named class. Returns 0 otherwise. This method works in
* combination with vtkTypeMacro found in vtkSetGet.h.
*/
virtual vtkTypeBool IsA(const char* name);
/**
* Given a the name of a base class of this class type, return the distance
* of inheritance between this class type and the named class (how many
* generations of inheritance are there between this class and the named
* class). If the named class is not in this class's inheritance tree, return
* a negative value. Valid responses will always be nonnegative. This method
* works in combination with vtkTypeMacro found in vtkSetGet.h.
*/
static vtkIdType GetNumberOfGenerationsFromBaseType(const char* name);
/**
* Given the name of a base class of this class type, return the distance
* of inheritance between this class type and the named class (how many
* generations of inheritance are there between this class and the named
* class). If the named class is not in this class's inheritance tree, return
* a negative value. Valid responses will always be nonnegative. This method
* works in combination with vtkTypeMacro found in vtkSetGet.h.
*/
virtual vtkIdType GetNumberOfGenerationsFromBase(const char* name);
/**
* Delete a VTK object. This method should always be used to delete
* an object when the New() method was used to create it. Using the
* C++ delete method will not work with reference counting.
*/
virtual void Delete();
/**
* Delete a reference to this object. This version will not invoke
* garbage collection and can potentially leak the object if it is
* part of a reference loop. Use this method only when it is known
* that the object has another reference and would not be collected
* if a full garbage collection check were done.
*/
virtual void FastDelete();
/**
* Create an object with Debug turned off, modified time initialized
* to zero, and reference counting on.
*/
static vtkObjectBase* New()
{
vtkObjectBase* o = new vtkObjectBase;
o->InitializeObjectBase();
return o;
}
// Called by implementations of vtkObject::New(). Centralized location for
// vtkDebugLeaks registration:
void InitializeObjectBase();
#if defined(_WIN32) || defined(VTK_USE_MEMKIND)
// Take control of allocation to avoid dll boundary problems or to use memkind.
void* operator new(size_t tSize);
void operator delete(void* p);
#endif
/**
* Print an object to an ostream. This is the method to call
* when you wish to see print the internal state of an object.
*/
void Print(ostream& os);
///@{
/**
* Methods invoked by print to print information about the object
* including superclasses. Typically not called by the user (use
* Print() instead) but used in the hierarchical print process to
* combine the output of several classes.
*/
virtual void PrintSelf(ostream& os, vtkIndent indent);
virtual void PrintHeader(ostream& os, vtkIndent indent);
virtual void PrintTrailer(ostream& os, vtkIndent indent);
///@}
/**
* Increase the reference count (mark as used by another object).
*/
virtual void Register(vtkObjectBase* o);
/**
* Decrease the reference count (release by another object). This
* has the same effect as invoking Delete() (i.e., it reduces the
* reference count by 1).
*/
virtual void UnRegister(vtkObjectBase* o);
/**
* Return the current reference count of this object.
*/
int GetReferenceCount() { return this->ReferenceCount; }
/**
* Sets the reference count. (This is very dangerous, use with care.)
*/
void SetReferenceCount(int);
/**
* The name of a directory, ideally mounted -o dax, to memory map an
* extended memory space within.
* This must be called before any objects are constructed in the extended space.
* It can not be changed once setup.
*/
static void SetMemkindDirectory(const char* directoryname);
///@{
/**
* A global state flag that controls whether vtkObjects are
* constructed in the usual way (the default) or within the extended
* memory space.
*/
static bool GetUsingMemkind();
///@}
/**
* A class to help modify and restore the global UsingMemkind state, like
* SetUsingMemkind(newValue), but safer. Declare it on the stack in a function where you want to
* make a temporary change. When the function returns it will restore the original value.
*/
class VTKCOMMONCORE_EXPORT vtkMemkindRAII
{
#ifdef VTK_USE_MEMKIND
bool OriginalValue;
#endif
public:
vtkMemkindRAII(bool newValue);
~vtkMemkindRAII();
vtkMemkindRAII(vtkMemkindRAII const&) = default;
private:
void Save(bool newValue);
void Restore();
};
/**
* A local state flag that remembers whether this object lives in
* the normal or extended memory space.
*/
bool GetIsInMemkind() const;
protected:
vtkObjectBase();
virtual ~vtkObjectBase();
std::atomic<int32_t> ReferenceCount;
vtkWeakPointerBase** WeakPointers;
// Internal Register/UnRegister implementation that accounts for
// possible garbage collection participation. The second argument
// indicates whether to participate in garbage collection.
virtual void RegisterInternal(vtkObjectBase*, vtkTypeBool check);
virtual void UnRegisterInternal(vtkObjectBase*, vtkTypeBool check);
// See vtkGarbageCollector.h:
virtual void ReportReferences(vtkGarbageCollector*);
// Call this to call from either malloc or memkind_malloc depending on current UsingMemkind
static vtkMallocingFunction GetCurrentMallocFunction();
// Call this to call from either realloc or memkind_realloc depending on current UsingMemkind
static vtkReallocingFunction GetCurrentReallocFunction();
// Call this to call from either free or memkind_free depending on instance's IsInMemkind
static vtkFreeingFunction GetCurrentFreeFunction();
// Call this to unconditionally call memkind_free
static vtkFreeingFunction GetAlternateFreeFunction();
private:
friend VTKCOMMONCORE_EXPORT ostream& operator<<(ostream& os, vtkObjectBase& o);
friend class vtkGarbageCollectorToObjectBaseFriendship;
friend class vtkWeakPointerBaseToObjectBaseFriendship;
friend class vtkMemkindRAII;
friend class vtkTDSCMemkindRAII;
static void SetUsingMemkind(bool);
bool IsInMemkind;
void SetIsInMemkind(bool);
protected:
vtkObjectBase(const vtkObjectBase&) {}
void operator=(const vtkObjectBase&) {}
};
#endif
// VTK-HeaderTest-Exclude: vtkObjectBase.h