An array of TObjects.

The array expands automatically when objects are added (shrinking can be done by hand using Expand(), how nice to have meaningful names -:)). Use operator[] to have "real" array behaviour.

Note on ownership and copy: By default the TObjArray does not own the objects it points to and will not delete them unless explicitly asked (via a call to the Delete member function). To assign ownership of the content to the array, call:

myarr->SetOwner(kTRUE);

kTRUE

constexpr Bool_t kTRUE

Definition RtypesCore.h:93

When the array owns its content a call to Clear or the deletion of the array itself will lead to the deletion of its contents.

You can either make a shallow copy of the array:

otherarr = new TObjArray(*myarr);

*otherarr = *myarr;

TObjArray

An array of TObjects.

Definition TObjArray.h:31

in which case ownership (if any) is not transfered but the other array points to the same object as the original array. Note that if the content of either array is deleted the other array is not notified in any way (i.e. still points to the now deleted objects).

You can also make a deep copy of the array:

otherarr = (TObjArray*)myarr->Clone();

in which case the array and the content are both duplicated (i.e. otherarr and myarr do not point to the same objects). If myarr is set to the be the owner of its content, otherarr will also be set to the owner of its own content.

Definition at line 31 of file TObjArray.h.

Public Types
typedef TObjArrayIter	Iterator_t

Public Types inherited from TCollection
enum	{ kInitCapacity = 16 , kInitHashTableCapacity = 17 }

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 )) }

Public Member Functions
	TObjArray (const TObjArray &a)
	Create a copy of TObjArray a. Note, does not copy the kIsOwner flag.

	TObjArray (Int_t s=TCollection::kInitCapacity, Int_t lowerBound=0)
	Create an object array.

virtual	~TObjArray ()
	Delete an array.

void	Add (TObject *obj) override

void	AddAfter (const TObject after, TObject obj) override
	Add object in the slot after object after.

void	AddAt (TObject *obj, Int_t idx) override
	Add object at position ids.

virtual void	AddAtAndExpand (TObject *obj, Int_t idx)
	Add object at position idx.

virtual Int_t	AddAtFree (TObject *obj)
	Return the position of the new object.

void	AddBefore (const TObject before, TObject obj) override
	Add object in the slot before object before.

void	AddFirst (TObject *obj) override
	Add object in the first slot of the array.

void	AddLast (TObject *obj) override
	Add object in the next empty slot in the array.

TObject *	After (const TObject *obj) const override
	Return the object after obj. Returns 0 if obj is last object.

TObject *	At (Int_t idx) const override

TObject *	Before (const TObject *obj) const override
	Return the object before obj. Returns 0 if obj is first object.

virtual Int_t	BinarySearch (TObject *obj, Int_t upto=kMaxInt)
	Find object using a binary search.

void	Clear (Option_t *option="") override
	Remove all objects from the array.

virtual void	Compress ()
	Remove empty slots from array.

void	Delete (Option_t *option="") override
	Remove all objects from the array AND delete all heap based objects.

virtual void	Expand (Int_t newSize)
	Expand or shrink the array to newSize elements.

TObject *	FindObject (const char *name) const override
	Find an object in this collection using its name.

TObject *	FindObject (const TObject *obj) const override
	Find an object in this collection using the object's IsEqual() member function.

TObject *	First () const override
	Return the object in the first slot.

Int_t	GetEntries () const override
	Return the number of objects in array (i.e.

Int_t	GetEntriesFast () const

Int_t	GetEntriesUnsafe () const
	Return the number of objects in array (i.e.

Int_t	GetLast () const override
	Return index of last object in array.

TObject **	GetObjectRef () const

TObject **	GetObjectRef (const TObject *obj) const override
	Return address of pointer obj. If obj is 0 returns address of container.

Int_t	IndexOf (const TObject *obj) const override

TClass *	IsA () const override

Bool_t	IsEmpty () const override

TObject *	Last () const override
	Return the object in the last filled slot. Returns 0 if no entries.

Int_t	LowerBound () const

TIterator *	MakeIterator (Bool_t dir=kIterForward) const override
	Returns an array iterator.

TObjArray &	operator= (const TObjArray &)
	Assignment operator. Note, unsets the kIsOwner flag.

virtual TObject *&	operator[] (Int_t i)
	Return the object at position i.

virtual TObject *	operator[] (Int_t i) const
	Return the object at position at. Returns 0 if i is out of bounds.

virtual void	Randomize (Int_t ntimes=1)
	Randomize objects inside the array, i.e.

void	RecursiveRemove (TObject *obj) override
	Remove object from this collection and recursively remove the object from all other objects (and collections).

TObject *	Remove (TObject *obj) override
	Remove object from array.

TObject *	RemoveAt (Int_t idx) override
	Remove object at index idx.

virtual void	RemoveRange (Int_t idx1, Int_t idx2)
	Remove objects from index idx1 to idx2 included.

void	SetLast (Int_t last)
	Set index of last object in array, effectively truncating the array.

virtual void	Sort (Int_t upto=kMaxInt)
	If objects in array are sortable (i.e.

void	Streamer (TBuffer &) override
	Stream all objects in the array to or from the I/O buffer.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

TObject *	UncheckedAt (Int_t i) const

Public Member Functions inherited from TSeqCollection
virtual	~TSeqCollection ()

void	Add (TObject *obj) override

TClass *	IsA () const override

virtual Bool_t	IsSorted () const

Int_t	LastIndex () const

Long64_t	Merge (TCollection *list)
	Merge this collection with all collections coming in the input list.

virtual void	RemoveAfter (TObject *after)

virtual void	RemoveBefore (TObject *before)

virtual void	RemoveFirst ()

virtual void	RemoveLast ()

void	Streamer (TBuffer &) override
	Stream all objects in the collection to or from the I/O buffer.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

void	UnSort ()

Public Member Functions inherited from TCollection
virtual	~TCollection ()
	TNamed destructor.

virtual void	AddAll (const TCollection *col)
	Add all objects from collection col to this collection.

void	AddVector (TObject *obj1,...)
	Add all arguments to the collection.

Bool_t	AssertClass (TClass *cl) const
	Make sure all objects in this collection inherit from class cl.

TIter	begin () const

void	Browse (TBrowser *b) override
	Browse this collection (called by TBrowser).

Int_t	Capacity () const

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

Int_t	Compare (const TObject *obj) const override
	Compare two TCollection objects.

Bool_t	Contains (const char *name) const

Bool_t	Contains (const TObject *obj) const

void	Draw (Option_t *option="") override
	Draw all objects in this collection.

void	Dump () const override
	Dump all objects in this collection.

TIter	end () const

const char *	GetName () const override
	Return name of this collection.

virtual Int_t	GetSize () const
	Return the capacity of the collection, i.e.

virtual Int_t	GrowBy (Int_t delta) const
	Increase the collection's capacity by delta slots.

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

Bool_t	IsArgNull (const char where, const TObject obj) const
	Returns true if object is a null pointer.

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

Bool_t	IsOwner () const

Bool_t	IsSortable () const override

R__ALWAYS_INLINE Bool_t	IsUsingRWLock () const

void	ls (Option_t *option="") const override
	List (ls) all objects in this collection.

virtual TIterator *	MakeReverseIterator () const

Bool_t	Notify () override
	'Notify' all objects in this collection.

TObject *	operator() (const char *name) const
	Find an object in this collection by name.

void	Paint (Option_t *option="") override
	Paint all objects in this collection.

virtual void	Print (Option_t option, const char wildcard, Int_t recurse=1) const
	Print the collection header and its elements that match the wildcard.

virtual void	Print (Option_t *option, Int_t recurse) const
	Print the collection header and its elements.

virtual void	Print (Option_t *option, TPRegexp &regexp, Int_t recurse=1) const
	Print the collection header and its elements that match the regexp.

void	Print (Option_t *option="") const override
	Default print for collections, calls Print(option, 1).

void	RemoveAll ()

virtual void	RemoveAll (TCollection *col)
	Remove all objects in collection col from this collection.

void	SetCurrentCollection ()
	Set this collection to be the globally accessible collection.

void	SetName (const char *name)

virtual void	SetOwner (Bool_t enable=kTRUE)
	Set whether this collection is the owner (enable==true) of its content.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

virtual bool	UseRWLock (Bool_t enable=true)
	Set this collection to use a RW lock upon access, making it thread safe.

Int_t	Write (const char *name=nullptr, Int_t option=0, Int_t bufsize=0) const override
	Write all objects in this collection.

Int_t	Write (const char *name=nullptr, Int_t option=0, Int_t bufsize=0) override
	Write all objects in this collection.

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.

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	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	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	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 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 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.

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).

R__ALWAYS_INLINE Bool_t	IsOnHeap () const

R__ALWAYS_INLINE Bool_t	IsZombie () const

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).

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	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.

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.

Static Public Member Functions
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

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

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

static Int_t	ObjCompare (TObject a, TObject b)
	Compare to objects in the collection. Use member Compare() of object a.

static void	QSort (TObject **a, Int_t first, Int_t last)
	Sort array of TObject pointers using a quicksort algorithm.

static void	QSort (TObject a, Int_t nBs, TObject *b, Int_t first, Int_t last)
	Sort array a of TObject pointers using a quicksort algorithm.

static void	QSort (TObject a, TObject b, Int_t first, Int_t last)

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

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

static void	EmptyGarbageCollection ()
	Do the garbage collection.

static void	GarbageCollect (TObject *obj)
	Add to the list of things to be cleaned up.

static TCollection *	GetCurrentCollection ()
	Return the globally accessible collection.

static void	StartGarbageCollection ()
	Set up for garbage collection.

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.

Protected Member Functions
Bool_t	BoundsOk (const char *where, Int_t at) const

Int_t	GetAbsLast () const
	Return absolute index to last object in array.

void	Init (Int_t s, Int_t lowerBound)
	Initialize a TObjArray.

Bool_t	OutOfBoundsError (const char *where, Int_t i) const
	Generate an out-of-bounds error. Always returns false.

Protected Member Functions inherited from TSeqCollection
	TSeqCollection ()

virtual void	Changed ()

Protected Member Functions inherited from TCollection
	TCollection ()

virtual const char *	GetCollectionEntryName (TObject *entry) const
	For given collection entry return the string that is used to identify the object and, potentially, perform wildcard/regexp filtering on.

virtual void	PrintCollectionEntry (TObject entry, Option_t option, Int_t recurse) const
	Print the collection entry.

virtual void	PrintCollectionHeader (Option_t *option) const
	Print the collection header.

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 ()

Protected Attributes
TObject **	fCont

Int_t	fLast

Int_t	fLowerBound
	Array contents.

Protected Attributes inherited from TSeqCollection
Bool_t	fSorted

Protected Attributes inherited from TCollection
TString	fName

Int_t	fSize

Friends
class	TClonesArray

class	TObjArrayIter

Additional Inherited Members
Protected Types inherited from TCollection
enum	EStatusBits { kIsOwner = (1ULL << ( 14 )) , kUseRWLock = (1ULL << ( 16 )) }

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

#include <TObjArray.h>

Inheritance diagram for TObjArray:

[legend]

Member Typedef Documentation

◆ Iterator_t

typedef TObjArrayIter TObjArray::Iterator_t

Definition at line 47 of file TObjArray.h.

Constructor & Destructor Documentation

◆ TObjArray() [1/2]

TObjArray::TObjArray	(	Int_t	s = `TCollection::kInitCapacity`,
		Int_t	lowerBound = `0`
	)

Create an object array.

Using s one can set the array size (default is kInitCapacity=16) and lowerBound can be used to set the array lowerbound index (default is 0).

Definition at line 64 of file TObjArray.cxx.

◆ TObjArray() [2/2]

TObjArray::TObjArray ( const TObjArray & a )

Create a copy of TObjArray a. Note, does not copy the kIsOwner flag.

Definition at line 78 of file TObjArray.cxx.

◆ ~TObjArray()

TObjArray::~TObjArray ( )

virtual

Delete an array.

Objects are not deleted unless the TObjArray is the owner (set via SetOwner()).

Definition at line 94 of file TObjArray.cxx.

Member Function Documentation

◆ Add()

void TObjArray::Add ( TObject * obj )

inlineoverridevirtual

Implements TCollection.

Definition at line 68 of file TObjArray.h.

◆ AddAfter()

void TObjArray::AddAfter	(	const TObject *	after,
		TObject *	obj
	)

overridevirtual

Add object in the slot after object after.

If after=0 add object in the last empty slot. Note that this will overwrite any object that might have already been in this slot. For insertion semantics use either a TList or a TOrdCollection.

Implements TSeqCollection.

Definition at line 215 of file TObjArray.cxx.

◆ AddAt()

void TObjArray::AddAt	(	TObject *	obj,
		Int_t	idx
	)

overridevirtual

Add object at position ids.

Give an error when idx is out of bounds (i.e. the array is not expanded).

Implements TSeqCollection.

Definition at line 254 of file TObjArray.cxx.

◆ AddAtAndExpand()

void TObjArray::AddAtAndExpand	(	TObject *	obj,
		Int_t	idx
	)

virtual

Add object at position idx.

If idx is larger than the current size of the array, expand the array (double its size).

Reimplemented in TClonesArray.

Definition at line 235 of file TObjArray.cxx.

◆ AddAtFree()

Int_t TObjArray::AddAtFree ( TObject * obj )

virtual

Return the position of the new object.

Find the first empty cell or AddLast if there is no empty cell

Reimplemented in TClonesArray.

Definition at line 269 of file TObjArray.cxx.

◆ AddBefore()

void TObjArray::AddBefore	(	const TObject *	before,
		TObject *	obj
	)

overridevirtual

Add object in the slot before object before.

If before=0 add object in the first slot. Note that this will overwrite any object that might have already been in this slot. For insertion semantics use either a TList or a TOrdCollection.

Implements TSeqCollection.

Definition at line 189 of file TObjArray.cxx.

◆ AddFirst()

void TObjArray::AddFirst ( TObject * obj )

overridevirtual

Add object in the first slot of the array.

This will overwrite the first element that might have been there. To have insertion semantics use either a TList or a TOrdCollection.

Implements TSeqCollection.

Definition at line 164 of file TObjArray.cxx.

◆ AddLast()

void TObjArray::AddLast ( TObject * obj )

overridevirtual

Add object in the next empty slot in the array.

Expand the array if necessary.

Implements TSeqCollection.

Definition at line 178 of file TObjArray.cxx.

◆ After()

TObject * TObjArray::After ( const TObject * obj ) const

overridevirtual

Return the object after obj. Returns 0 if obj is last object.

Implements TSeqCollection.

Definition at line 290 of file TObjArray.cxx.

◆ At()

TObject * TObjArray::At ( Int_t idx ) const

inlineoverridevirtual

Implements TSeqCollection.

Definition at line 164 of file TObjArray.h.

◆ Before()

TObject * TObjArray::Before ( const TObject * obj ) const

overridevirtual

Return the object before obj. Returns 0 if obj is first object.

Implements TSeqCollection.

Definition at line 305 of file TObjArray.cxx.

◆ BinarySearch()

Int_t TObjArray::BinarySearch	(	TObject *	op,
		Int_t	upto = `kMaxInt`
	)

virtual

Find object using a binary search.

Array must first have been sorted. Search can be limited by setting upto to desired index.

Definition at line 841 of file TObjArray.cxx.

◆ BoundsOk()

Bool_t TObjArray::BoundsOk	(	const char *	where,
		Int_t	at
	)		const

inlineprotected

Definition at line 157 of file TObjArray.h.

◆ Class()

static TClass * TObjArray::Class ( )

static

Returns: TClass describing this class

◆ Class_Name()

static const char * TObjArray::Class_Name ( )

static

Returns: Name of this class

◆ Class_Version()

static constexpr Version_t TObjArray::Class_Version ( )

inlinestaticconstexpr

Returns: Version of this class

Definition at line 99 of file TObjArray.h.

◆ Clear()

void TObjArray::Clear ( Option_t * option = "" )

overridevirtual

Remove all objects from the array.

Does not delete the objects unless the TObjArray is the owner (set via SetOwner()).

Implements TCollection.

Definition at line 321 of file TObjArray.cxx.

◆ Compress()

void TObjArray::Compress ( )

virtual

Remove empty slots from array.

Reimplemented in TClonesArray.

Definition at line 334 of file TObjArray.cxx.

◆ DeclFileName()

static const char * TObjArray::DeclFileName ( )

inlinestatic

Returns: Name of the file containing the class declaration

Definition at line 99 of file TObjArray.h.

◆ Delete()

void TObjArray::Delete ( Option_t * option = "" )

overridevirtual

Remove all objects from the array AND delete all heap based objects.

Implements TCollection.

Definition at line 356 of file TObjArray.cxx.

◆ Expand()

void TObjArray::Expand ( Int_t newSize )

virtual

Expand or shrink the array to newSize elements.

Reimplemented in TClonesArray.

Definition at line 387 of file TObjArray.cxx.

◆ FindObject() [1/2]

TObject * TObjArray::FindObject ( const char * name ) const

overridevirtual

Find an object in this collection using its name.

Requires a sequential scan till the object has been found. Returns 0 if object with specified name is not found.

Reimplemented from TCollection.

Definition at line 415 of file TObjArray.cxx.

◆ FindObject() [2/2]

TObject * TObjArray::FindObject ( const TObject * iobj ) const

overridevirtual

Find an object in this collection using the object's IsEqual() member function.

Requires a sequential scan till the object has been found. Returns 0 if object is not found. Typically this function is overridden by a more efficient version in concrete collection classes (e.g. THashTable).

Reimplemented from TCollection.

Definition at line 434 of file TObjArray.cxx.

◆ First()

TObject * TObjArray::First ( ) const

overridevirtual

Return the object in the first slot.

Implements TSeqCollection.

Definition at line 496 of file TObjArray.cxx.

◆ GetAbsLast()

Int_t TObjArray::GetAbsLast ( ) const

protected

Return absolute index to last object in array.

Returns -1 in case array is empty.

Definition at line 539 of file TObjArray.cxx.

◆ GetEntries()

Int_t TObjArray::GetEntries ( ) const

overridevirtual

Return the number of objects in array (i.e.

number of non-empty slots). Attention: use this method ONLY if you want to know the number of non-empty slots. This function loops over the complete array and is therefore very slow when applied in a loop. Most of the time you better use GetEntriesFast() (only in case when there are no empty slots).

Reimplemented from TCollection.

Definition at line 523 of file TObjArray.cxx.

◆ GetEntriesFast()

Int_t TObjArray::GetEntriesFast ( ) const

inline

Definition at line 58 of file TObjArray.h.

◆ GetEntriesUnsafe()

Int_t TObjArray::GetEntriesUnsafe ( ) const

Return the number of objects in array (i.e.

number of non-empty slots). This is a thread-unsafe version of GetEntriesFast. Use it only if sure it will not be invoked concurrently.

Definition at line 565 of file TObjArray.cxx.

◆ GetLast()

Int_t TObjArray::GetLast ( ) const

overridevirtual

Return index of last object in array.

Returns lowerBound-1 in case array is empty.

Reimplemented from TSeqCollection.

Definition at line 577 of file TObjArray.cxx.

◆ GetObjectRef() [1/2]

TObject ** TObjArray::GetObjectRef ( ) const

inline

Definition at line 63 of file TObjArray.h.

◆ GetObjectRef() [2/2]

TObject ** TObjArray::GetObjectRef ( const TObject * obj ) const

overridevirtual

Return address of pointer obj. If obj is 0 returns address of container.

Implements TCollection.

Definition at line 587 of file TObjArray.cxx.

◆ IndexOf()

Int_t TObjArray::IndexOf ( const TObject * obj ) const

overridevirtual

obj != 0 Return index of object in array. Returns lowerBound-1 in case array doesn't contain the obj.
obj == 0 Return the index of the first empty slot. Returns lowerBound-1 in case array doesn't contain any empty slot.

Reimplemented from TSeqCollection.

Definition at line 605 of file TObjArray.cxx.

◆ Init()

void TObjArray::Init	(	Int_t	s,
		Int_t	lowerBound
	)

protected

Initialize a TObjArray.

Definition at line 627 of file TObjArray.cxx.

◆ IsA()

TClass * TObjArray::IsA ( ) const

inlineoverridevirtual

Returns: TClass describing current object

Reimplemented from TCollection.

Definition at line 99 of file TObjArray.h.

◆ IsEmpty()

Bool_t TObjArray::IsEmpty ( ) const

inlineoverridevirtual

Reimplemented from TCollection.

Definition at line 65 of file TObjArray.h.

◆ Last()

TObject * TObjArray::Last ( ) const

overridevirtual

Return the object in the last filled slot. Returns 0 if no entries.

Implements TSeqCollection.

Definition at line 506 of file TObjArray.cxx.

◆ LowerBound()

Int_t TObjArray::LowerBound ( ) const

inline

Definition at line 91 of file TObjArray.h.

◆ MakeIterator()

TIterator * TObjArray::MakeIterator ( Bool_t dir = kIterForward ) const

overridevirtual

Returns an array iterator.

Implements TCollection.

Definition at line 649 of file TObjArray.cxx.

◆ operator=()

TObjArray & TObjArray::operator= ( const TObjArray & a )

Assignment operator. Note, unsets the kIsOwner flag.

Definition at line 107 of file TObjArray.cxx.

◆ operator[]() [1/2]

TObject *& TObjArray::operator[] ( Int_t i )

virtual

Return the object at position i.

Returns address at position 0 if i is out of bounds. Result may be used as an lvalue.

Reimplemented in TClonesArray.

Definition at line 131 of file TObjArray.cxx.

◆ operator[]() [2/2]

TObject * TObjArray::operator[] ( Int_t i ) const

virtual

Return the object at position at. Returns 0 if i is out of bounds.

Reimplemented in TClonesArray.

Definition at line 149 of file TObjArray.cxx.

◆ OutOfBoundsError()

Bool_t TObjArray::OutOfBoundsError	(	const char *	where,
		Int_t	i
	)		const

protected

Generate an out-of-bounds error. Always returns false.

Definition at line 658 of file TObjArray.cxx.

◆ Randomize()

void TObjArray::Randomize ( Int_t ntimes = 1 )

virtual

Randomize objects inside the array, i.e.

permute randomly objects. With fLast being the index of the last entry in the array, the following algorithm is applied to the array:

for each entry j between 0 and fLast, another entry k is chosen randomly between 0 and fLast.
the objects at j and k are swapped.
this process is repeated ntimes (ntimes = 1 by default).

Definition at line 795 of file TObjArray.cxx.

◆ RecursiveRemove()

void TObjArray::RecursiveRemove ( TObject * obj )

overridevirtual

Remove object from this collection and recursively remove the object from all other objects (and collections).

Reimplemented from TCollection.

Definition at line 668 of file TObjArray.cxx.

◆ Remove()

TObject * TObjArray::Remove ( TObject * obj )

overridevirtual

Remove object from array.

Implements TCollection.

Definition at line 719 of file TObjArray.cxx.

◆ RemoveAt()

TObject * TObjArray::RemoveAt ( Int_t idx )

overridevirtual

Remove object at index idx.

Reimplemented from TSeqCollection.

Definition at line 694 of file TObjArray.cxx.

◆ RemoveRange()

void TObjArray::RemoveRange	(	Int_t	idx1,
		Int_t	idx2
	)

virtual

Remove objects from index idx1 to idx2 included.

Reimplemented in TClonesArray.

Definition at line 743 of file TObjArray.cxx.

◆ SetLast()

void TObjArray::SetLast ( Int_t last )

Set index of last object in array, effectively truncating the array.

Use carefully since whenever last position has to be recalculated, e.g. after a Remove() or Sort() it will be reset to the last non-empty slot. If last is -2 this will force the recalculation of the last used slot. If last is -1, this effectively truncate the array completely.

Definition at line 775 of file TObjArray.cxx.

◆ Sort()

void TObjArray::Sort ( Int_t upto = kMaxInt )

virtual

If objects in array are sortable (i.e.

IsSortable() returns true for all objects) then sort array.

Reimplemented in TClonesArray.

Definition at line 818 of file TObjArray.cxx.

◆ Streamer()

void TObjArray::Streamer ( TBuffer & b )

overridevirtual

Stream all objects in the array to or from the I/O buffer.

Reimplemented from TCollection.

Definition at line 449 of file TObjArray.cxx.

◆ StreamerNVirtual()

void TObjArray::StreamerNVirtual ( TBuffer & ClassDef_StreamerNVirtual_b )

inline

Definition at line 99 of file TObjArray.h.

◆ UncheckedAt()

TObject * TObjArray::UncheckedAt ( Int_t i ) const

inline

Definition at line 84 of file TObjArray.h.

Friends And Related Symbol Documentation

◆ TClonesArray

friend class TClonesArray

friend

Definition at line 34 of file TObjArray.h.

◆ TObjArrayIter

friend class TObjArrayIter

friend

Definition at line 33 of file TObjArray.h.

Member Data Documentation

◆ fCont

TObject** TObjArray::fCont

protected

Definition at line 37 of file TObjArray.h.

◆ fLast

Int_t TObjArray::fLast

protected

Definition at line 39 of file TObjArray.h.

◆ fLowerBound

Int_t TObjArray::fLowerBound

protected

Array contents.

Definition at line 38 of file TObjArray.h.

Libraries for TObjArray:

[legend]

The documentation for this class was generated from the following files:

core/cont/inc/TObjArray.h
core/cont/src/TObjArray.cxx

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Friends

Additional Inherited Members

Member Typedef Documentation

◆ Iterator_t

Constructor & Destructor Documentation

◆ TObjArray() [1/2]

◆ TObjArray() [2/2]

◆ ~TObjArray()

Member Function Documentation

◆ Add()

◆ AddAfter()

◆ AddAt()

◆ AddAtAndExpand()

◆ AddAtFree()

◆ AddBefore()

◆ AddFirst()

◆ AddLast()

◆ After()

◆ At()

◆ Before()

◆ BinarySearch()

◆ BoundsOk()

◆ Class()

◆ Class_Name()

◆ Class_Version()

◆ Clear()

◆ Compress()

◆ DeclFileName()

◆ Delete()

◆ Expand()

◆ FindObject() [1/2]

◆ FindObject() [2/2]

◆ First()

◆ GetAbsLast()

◆ GetEntries()

◆ GetEntriesFast()

◆ GetEntriesUnsafe()

◆ GetLast()

◆ GetObjectRef() [1/2]

◆ GetObjectRef() [2/2]

◆ IndexOf()

◆ Init()

◆ IsA()

◆ IsEmpty()

◆ Last()

◆ LowerBound()

◆ MakeIterator()

◆ operator=()

◆ operator[]() [1/2]

◆ operator[]() [2/2]

◆ OutOfBoundsError()

◆ Randomize()

◆ RecursiveRemove()

◆ Remove()

◆ RemoveAt()

◆ RemoveRange()

◆ SetLast()

◆ Sort()

◆ Streamer()

◆ StreamerNVirtual()

◆ UncheckedAt()

Friends And Related Symbol Documentation

◆ TClonesArray

◆ TObjArrayIter

Member Data Documentation

◆ fCont

◆ fLast

◆ fLowerBound