This class registers all instances of TObject and its derived classes in a hash table.

The Add() and Remove() members are called from the TObject ctor and dtor, respectively. Using the Print() member one can see all currently active objects in the system. Using the resource (in .rootrc): Root.ObjectStat one can toggle this feature on or off.

Using the compile option R__NOSTATS one can de-active this feature for the entire system (for maximum performance in highly time critical applications).

The following output has been produced in a ROOT interactive session via the command gObjectTable->Print()

class                     cnt    on heap     size    total size    heap size
============================================================================
TKey                        4          4       72           288          288
TClass                     84         84       80          6720         6720
TDataMember               276        276       24          6624         6624
TObject                    11         11       12           132          132
TMethod                  1974       1974       64        126336       126336
TDataType                  34         34       56          1904         1904
TList                    2328       2328       36         83808        83808
TH1F                        1          1      448           448          448
TText                    2688       2688       56        150528       150528
TGaxis                      1          0      120           120            0
TAxis                       6          3       88           528          264
TBox                       57         57       52          2964         2964
TLine                     118        118       40          4720         4720
TWbox                       1          1       56            56           56
TArrow                      1          1       64            64           64
TPaveText                  59         59      124          7316         7316
TPave                       1          1       92            92           92
TFile                       1          1      136           136          136
TCanvas                     3          3      444          1332         1332
TPad                        1          1      312           312          312
TContextMenu                3          3       48           144          144
TMethodArg               2166       2166       44         95304        95304
TPaveLabel                  1          1      120           120          120
THtml                       1          1       32            32           32
TROOT                       1          0      208           208            0
TApplication                1          1       28            28           28
TFileHandler                1          1       20            20           20
TColor                    163        163       40          6520         6520
TStyle                      1          1      364           364          364
TRealData                 117        117       28          3276         3276
TBaseClass                 88         88       36          3168         3168
THashList                   5          5       40           200          200
THashTable                  5          5       36           180          180
TGeometry                   1          1       64            64           64
TLink                       7          7       60           420          420
TPostScript                 1          1      764           764          764
TMinuit                     1          1      792           792          792
TStopwatch                  1          0       56            56            0
TRootGuiFactory             1          1       28            28           28
TGX11                       1          1      172           172          172
TUnixSystem                 1          1      252           252          252
TSignalHandler              1          1       20            20           20
TOrdCollection              3          3       40           120          120
TEnv                        1          1       24            24           24
TCling                      1          1      208           208          208
TBenchmark                  1          1       52            52           52
TClassTable                 1          1       12            12           12
TObjectTable                1          1       12            12           12
----------------------------------------------------------------------------
Total:                  10225      10219     5976        506988       506340
============================================================================

Definition at line 35 of file TObjectTable.h.

Public Member Functions
	TObjectTable (Int_t tableSize=100)
	Create an object table.

	~TObjectTable ()
	Delete TObjectTable.

void	Add (TObject *obj)
	Add an object to the object table.

void *	CheckPtrAndWarn (const char msg, void vp)
	Issue a warning in case an object still appears in the table while it should not.

void	Delete (Option_t *opt="") override
	Delete all objects stored in the TObjectTable.

Int_t	GetSize () const

Int_t	Instances () const

void	InstanceStatistics () const
	Print the object table.

TClass *	IsA () const override

void	Print (Option_t *option="") const override
	Print the object table.

Bool_t	PtrIsValid (TObject *obj)

void	Remove (TObject *obj)
	Remove an object from the object table.

void	RemoveQuietly (TObject *obj)
	Remove an object from the object table.

void	Statistics ()

void	Streamer (TBuffer &) override
	Stream an object of class TObject.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

void	Terminate ()
	Deletes the object table (this static class function calls the dtor).

void	UpdateInstCount () const
	Histogram all objects according to their classes.

Public Member Functions inherited from TObject
	TObject ()
	TObject constructor.

	TObject (const TObject &object)
	TObject copy ctor.

virtual	~TObject ()
	TObject destructor.

void	AbstractMethod (const char *method) const
	Use this method to implement an "abstract" method that you don't want to leave purely abstract.

virtual void	AppendPad (Option_t *option="")
	Append graphics object to current pad.

virtual void	Browse (TBrowser *b)
	Browse object. May be overridden for another default action.

ULong_t	CheckedHash ()
	Check and record whether this class has a consistent Hash/RecursiveRemove setup (*) and then return the regular Hash value for this object.

virtual const char *	ClassName () const
	Returns name of class to which the object belongs.

virtual void	Clear (Option_t *="")

virtual TObject *	Clone (const char *newname="") const
	Make a clone of an object using the Streamer facility.

virtual Int_t	Compare (const TObject *obj) const
	Compare abstract method.

virtual void	Copy (TObject &object) const
	Copy this to obj.

virtual Int_t	DistancetoPrimitive (Int_t px, Int_t py)
	Computes distance from point (px,py) to the object.

virtual void	Draw (Option_t *option="")
	Default Draw method for all objects.

virtual void	DrawClass () const
	Draw class inheritance tree of the class to which this object belongs.

virtual TObject *	DrawClone (Option_t *option="") const
	Draw a clone of this object in the current selected pad with: `gROOT->SetSelectedPad(c1)`.

virtual void	Dump () const
	Dump contents of object on stdout.

virtual void	Error (const char method, const char msgfmt,...) const
	Issue error message.

virtual void	Execute (const char method, const char params, Int_t *error=nullptr)
	Execute method on this object with the given parameter string, e.g.

virtual void	Execute (TMethod method, TObjArray params, Int_t *error=nullptr)
	Execute method on this object with parameters stored in the TObjArray.

virtual void	ExecuteEvent (Int_t event, Int_t px, Int_t py)
	Execute action corresponding to an event at (px,py).

virtual void	Fatal (const char method, const char msgfmt,...) const
	Issue fatal error message.

virtual TObject *	FindObject (const char *name) const
	Must be redefined in derived classes.

virtual TObject *	FindObject (const TObject *obj) const
	Must be redefined in derived classes.

virtual Option_t *	GetDrawOption () const
	Get option used by the graphics system to draw this object.

virtual const char *	GetIconName () const
	Returns mime type name of object.

virtual const char *	GetName () const
	Returns name of object.

virtual char *	GetObjectInfo (Int_t px, Int_t py) const
	Returns string containing info about the object at position (px,py).

virtual Option_t *	GetOption () const

virtual const char *	GetTitle () const
	Returns title of object.

virtual UInt_t	GetUniqueID () const
	Return the unique object id.

virtual Bool_t	HandleTimer (TTimer *timer)
	Execute action in response of a timer timing out.

virtual ULong_t	Hash () const
	Return hash value for this object.

Bool_t	HasInconsistentHash () const
	Return true is the type of this object is known to have an inconsistent setup for Hash and RecursiveRemove (i.e.

virtual void	Info (const char method, const char msgfmt,...) const
	Issue info message.

virtual Bool_t	InheritsFrom (const char *classname) const
	Returns kTRUE if object inherits from class "classname".

virtual Bool_t	InheritsFrom (const TClass *cl) const
	Returns kTRUE if object inherits from TClass cl.

virtual void	Inspect () const
	Dump contents of this object in a graphics canvas.

void	InvertBit (UInt_t f)

Bool_t	IsDestructed () const
	IsDestructed.

virtual Bool_t	IsEqual (const TObject *obj) const
	Default equal comparison (objects are equal if they have the same address in memory).

virtual Bool_t	IsFolder () const
	Returns kTRUE in case object contains browsable objects (like containers or lists of other objects).

R__ALWAYS_INLINE Bool_t	IsOnHeap () const

virtual Bool_t	IsSortable () const

R__ALWAYS_INLINE Bool_t	IsZombie () const

virtual void	ls (Option_t *option="") const
	The ls function lists the contents of a class on stdout.

void	MayNotUse (const char *method) const
	Use this method to signal that a method (defined in a base class) may not be called in a derived class (in principle against good design since a child class should not provide less functionality than its parent, however, sometimes it is necessary).

virtual Bool_t	Notify ()
	This method must be overridden to handle object notification (the base implementation is no-op).

void	Obsolete (const char method, const char asOfVers, const char *removedFromVers) const
	Use this method to declare a method obsolete.

void	operator delete (void *ptr)
	Operator delete.

void	operator delete (void ptr, void vp)
	Only called by placement new when throwing an exception.

void	operator delete[] (void *ptr)
	Operator delete [].

void	operator delete[] (void ptr, void vp)
	Only called by placement new[] when throwing an exception.

void *	operator new (size_t sz)

void *	operator new (size_t sz, void *vp)

void *	operator new[] (size_t sz)

void *	operator new[] (size_t sz, void *vp)

TObject &	operator= (const TObject &rhs)
	TObject assignment operator.

virtual void	Paint (Option_t *option="")
	This method must be overridden if a class wants to paint itself.

virtual void	Pop ()
	Pop on object drawn in a pad to the top of the display list.

virtual Int_t	Read (const char *name)
	Read contents of object with specified name from the current directory.

virtual void	RecursiveRemove (TObject *obj)
	Recursively remove this object from a list.

void	ResetBit (UInt_t f)

virtual void	SaveAs (const char filename="", Option_t option="") const
	Save this object in the file specified by filename.

virtual void	SavePrimitive (std::ostream &out, Option_t *option="")
	Save a primitive as a C++ statement(s) on output stream "out".

void	SetBit (UInt_t f)

void	SetBit (UInt_t f, Bool_t set)
	Set or unset the user status bits as specified in f.

virtual void	SetDrawOption (Option_t *option="")
	Set drawing option for object.

virtual void	SetUniqueID (UInt_t uid)
	Set the unique object id.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

virtual void	SysError (const char method, const char msgfmt,...) const
	Issue system error message.

R__ALWAYS_INLINE Bool_t	TestBit (UInt_t f) const

Int_t	TestBits (UInt_t f) const

virtual void	UseCurrentStyle ()
	Set current style settings in this object This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked.

virtual void	Warning (const char method, const char msgfmt,...) const
	Issue warning message.

virtual Int_t	Write (const char *name=nullptr, Int_t option=0, Int_t bufsize=0)
	Write this object to the current directory.

virtual Int_t	Write (const char *name=nullptr, Int_t option=0, Int_t bufsize=0) const
	Write this object to the current directory.

Static Public Member Functions
static void	AddObj (TObject *obj)
	Add an object to the global object table gObjectTable.

static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

Static Public Member Functions inherited from TObject
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

static Longptr_t	GetDtorOnly ()
	Return destructor only flag.

static Bool_t	GetObjectStat ()
	Get status of object stat flag.

static void	SetDtorOnly (void *obj)
	Set destructor only flag.

static void	SetObjectStat (Bool_t stat)
	Turn on/off tracking of objects in the TObjectTable.

Private Member Functions
	TObjectTable (const TObjectTable &)=delete

void	Expand (Int_t newsize)
	Expand the object table.

Int_t	FindElement (TObject *obj)
	Find an object in the object table.

void	FixCollisions (Int_t index)
	Rehash the object table in case an object has been removed.

Bool_t	HighWaterMark ()

TObjectTable &	operator= (const TObjectTable &)=delete

Private Attributes
Int_t	fSize

TObject **	fTable

Int_t	fTally

Additional Inherited Members
Public Types inherited from TObject
enum	{ kIsOnHeap = 0x01000000 , kNotDeleted = 0x02000000 , kZombie = 0x04000000 , kInconsistent = 0x08000000 , kBitMask = 0x00ffffff }

enum	{ kSingleKey = (1ULL << ( 0 )) , kOverwrite = (1ULL << ( 1 )) , kWriteDelete = (1ULL << ( 2 )) }

enum	EDeprecatedStatusBits { kObjInCanvas = (1ULL << ( 3 )) }

enum	EStatusBits { kCanDelete = (1ULL << ( 0 )) , kMustCleanup = (1ULL << ( 3 )) , kIsReferenced = (1ULL << ( 4 )) , kHasUUID = (1ULL << ( 5 )) , kCannotPick = (1ULL << ( 6 )) , kNoContextMenu = (1ULL << ( 8 )) , kInvalidObject = (1ULL << ( 13 )) }

Protected Types inherited from TObject
enum	{ kOnlyPrepStep = (1ULL << ( 3 )) }

Protected Member Functions inherited from TObject
virtual void	DoError (int level, const char location, const char fmt, va_list va) const
	Interface to ErrorHandler (protected).

void	MakeZombie ()

#include <TObjectTable.h>

Inheritance diagram for TObjectTable:

[legend]

Constructor & Destructor Documentation

◆ TObjectTable() [1/2]

TObjectTable::TObjectTable ( const TObjectTable & )

privatedelete

◆ TObjectTable() [2/2]

TObjectTable::TObjectTable ( Int_t tableSize = 100 )

Create an object table.

Definition at line 99 of file TObjectTable.cxx.

◆ ~TObjectTable()

TObjectTable::~TObjectTable ( )

Delete TObjectTable.

Definition at line 110 of file TObjectTable.cxx.

Member Function Documentation

◆ Add()

void TObjectTable::Add ( TObject * obj )

Add an object to the object table.

Definition at line 147 of file TObjectTable.cxx.

◆ AddObj()

void TObjectTable::AddObj ( TObject * op )

static

Add an object to the global object table gObjectTable.

If the global table does not exist create it first. This member function may only be used by TObject::TObject. Use Add() to add objects to any other TObjectTable object. This is a static function.

Definition at line 171 of file TObjectTable.cxx.

◆ CheckPtrAndWarn()

void * TObjectTable::CheckPtrAndWarn	(	const char *	msg,
		void *	vp
	)

Issue a warning in case an object still appears in the table while it should not.

Definition at line 397 of file TObjectTable.cxx.

◆ Class()

static TClass * TObjectTable::Class ( )

static

Returns: TClass describing this class

◆ Class_Name()

static const char * TObjectTable::Class_Name ( )

static

Returns: Name of this class

◆ Class_Version()

static constexpr Version_t TObjectTable::Class_Version ( )

inlinestaticconstexpr

Returns: Version of this class

Definition at line 71 of file TObjectTable.h.

◆ DeclFileName()

static const char * TObjectTable::DeclFileName ( )

inlinestatic

Returns: Name of the file containing the class declaration

Definition at line 71 of file TObjectTable.h.

◆ Delete()

void TObjectTable::Delete ( Option_t * opt = "" )

overridevirtual

Delete all objects stored in the TObjectTable.

Reimplemented from TObject.

Definition at line 195 of file TObjectTable.cxx.

◆ Expand()

void TObjectTable::Expand ( Int_t newsize )

private

Expand the object table.

Definition at line 322 of file TObjectTable.cxx.

◆ FindElement()

Int_t TObjectTable::FindElement ( TObject * op )

private

Find an object in the object table.

Returns the slot where to put the object. To test if the object is actually already in the table use PtrIsValid().

Definition at line 276 of file TObjectTable.cxx.

◆ FixCollisions()

void TObjectTable::FixCollisions ( Int_t index )

private

Rehash the object table in case an object has been removed.

Definition at line 300 of file TObjectTable.cxx.

◆ GetSize()

Int_t TObjectTable::GetSize ( ) const

inline

Definition at line 58 of file TObjectTable.h.

◆ HighWaterMark()

Bool_t TObjectTable::HighWaterMark ( )

inlineprivate

Definition at line 75 of file TObjectTable.h.

◆ Instances()

Int_t TObjectTable::Instances ( ) const

inline

Definition at line 59 of file TObjectTable.h.

◆ InstanceStatistics()

void TObjectTable::InstanceStatistics ( ) const

Print the object table.

Definition at line 340 of file TObjectTable.cxx.

◆ IsA()

TClass * TObjectTable::IsA ( ) const

inlineoverridevirtual

Returns: TClass describing current object

Reimplemented from TObject.

Definition at line 71 of file TObjectTable.h.

◆ operator=()

TObjectTable & TObjectTable::operator= ( const TObjectTable & )

privatedelete

◆ Print()

void TObjectTable::Print ( Option_t * option = "" ) const

overridevirtual

Print the object table.

If option ="all" prints the list of all objects with the format object number, pointer, class name, object name

Reimplemented from TObject.

Definition at line 120 of file TObjectTable.cxx.

◆ PtrIsValid()

Bool_t TObjectTable::PtrIsValid ( TObject * obj )

inline

Definition at line 78 of file TObjectTable.h.

◆ Remove()

void TObjectTable::Remove ( TObject * obj )

Remove an object from the object table.

Definition at line 209 of file TObjectTable.cxx.

◆ RemoveQuietly()

void TObjectTable::RemoveQuietly ( TObject * op )

Remove an object from the object table.

If op is 0 or not in the table don't complain. Currently only used by the TClonesArray dtor. Should not be used anywhere else, except in places where "special" allocation and de-allocation tricks are performed.

Definition at line 243 of file TObjectTable.cxx.

◆ Statistics()

void TObjectTable::Statistics ( )

inline

Definition at line 65 of file TObjectTable.h.

◆ Streamer()

void TObjectTable::Streamer ( TBuffer & R__b )

overridevirtual

Stream an object of class TObject.

Reimplemented from TObject.

◆ StreamerNVirtual()

void TObjectTable::StreamerNVirtual ( TBuffer & ClassDef_StreamerNVirtual_b )

inline

Definition at line 71 of file TObjectTable.h.

◆ Terminate()

void TObjectTable::Terminate ( )

Deletes the object table (this static class function calls the dtor).

Definition at line 264 of file TObjectTable.cxx.

◆ UpdateInstCount()

void TObjectTable::UpdateInstCount ( ) const

Histogram all objects according to their classes.

Definition at line 375 of file TObjectTable.cxx.

Member Data Documentation

◆ fSize

Int_t TObjectTable::fSize

private

Definition at line 39 of file TObjectTable.h.

◆ fTable

TObject** TObjectTable::fTable

private

Definition at line 38 of file TObjectTable.h.

◆ fTally

Int_t TObjectTable::fTally

private

Definition at line 40 of file TObjectTable.h.

core/cont/inc/TObjectTable.h

core/cont/src/TObjectTable.cxx

Public Member Functions

Static Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ TObjectTable() [1/2]

◆ TObjectTable() [2/2]

◆ ~TObjectTable()

Member Function Documentation

◆ Add()

◆ AddObj()

◆ CheckPtrAndWarn()

◆ Class()

◆ Class_Name()

◆ Class_Version()

◆ DeclFileName()

◆ Delete()

◆ Expand()

◆ FindElement()

◆ FixCollisions()

◆ GetSize()

◆ HighWaterMark()

◆ Instances()

◆ InstanceStatistics()

◆ IsA()

◆ operator=()

◆ Print()

◆ PtrIsValid()

◆ Remove()

◆ RemoveQuietly()

◆ Statistics()

◆ Streamer()

◆ StreamerNVirtual()

◆ Terminate()

◆ UpdateInstCount()

Member Data Documentation

◆ fSize

◆ fTable

◆ fTally