Legacy Code

TEventList is a legacy interface: there will be no bug fixes nor new developments. Therefore it is not recommended to use it in new long-term production code. But, depending on the context, using TEventList might still be a valid solution.

A TEventList object is a list of selected events (entries) in a TTree.

A TEventList is automatically generated by TTree::Draw: example

tree->Draw(">>elist1","x<0 && y> 0");

In this example, a TEventList object named "elist1" will be generated. (Previous contents are overwritten).

tree->Draw(">>+elist1","x<0 && y> 0");

In this example, selected entries are added to the list.

The TEventList object is added to the list of objects in the current directory.

Use TTree:SetEventList(TEventList *list) to inform TTree that you want to use the list as input. The following code gets a pointer to the TEventList object created in the above commands:

TEventList *list = (TEventList*)gDirectory->Get("elist1");

gDirectory

#define gDirectory

Definition TDirectory.h:384

TEventList

<div class="legacybox"><h2>Legacy Code</h2> TEventList is a legacy interface: there will be no bug fi...

Definition TEventList.h:31

Use function Enter to enter an element in the list
The function Add may be used to merge two lists.
The function Subtract may be used to subtract two lists.
The function Reset may be used to reset a list.
Use TEventList::Print(option) to print the contents. (option "all" prints all the list entries).
Operators + and - correspond to functions Add and Subtract.
A TEventList object can be saved on a file via the Write function.

Definition at line 31 of file TEventList.h.

Public Member Functions
	TEventList ()
	Default constructor for a EventList.

	TEventList (const char name, const char title="", Int_t initsize=0, Int_t delta=0)
	Create a EventList.

	TEventList (const TEventList &list)
	Copy constructor.

	~TEventList () override
	Default destructor for a EventList.

virtual void	Add (const TEventList *list)
	Merge contents of alist with this list.

void	Clear (Option_t *option="") override

virtual bool	Contains (Long64_t entry)
	Return TRUE if list contains entry.

virtual bool	ContainsRange (Long64_t entrymin, Long64_t entrymax)
	Return TRUE if list contains entries from entrymin to entrymax included.

virtual void	DirectoryAutoAdd (TDirectory *)
	Called by TKey and others to automatically add us to a directory when we are read from a file.

virtual void	Enter (Long64_t entry)
	Enter element entry into the list.

TDirectory *	GetDirectory () const

virtual Long64_t	GetEntry (Int_t index) const
	Return value of entry at index in the list.

virtual Int_t	GetIndex (Long64_t entry) const
	Return index in the list of element with value entry array is supposed to be sorted prior to this call.

virtual Long64_t *	GetList () const

virtual Int_t	GetN () const

virtual bool	GetReapplyCut () const

virtual Int_t	GetSize () const

virtual void	Intersect (const TEventList *list)
	Remove elements from this list that are NOT present in alist.

TClass *	IsA () const override

virtual Int_t	Merge (TCollection *list)
	Merge entries in all the TEventList in the collection in this event list.

TEventList &	operator= (const TEventList &list)
	Assingment.

void	Print (Option_t *option="") const override
	Print contents of this list.

virtual void	Reset (Option_t *option="")
	Reset number of entries in event list.

virtual void	Resize (Int_t delta=0)
	Resize list by delta entries.

virtual void	SetDelta (Int_t delta=100)

virtual void	SetDirectory (TDirectory *dir)
	Remove reference to this EventList from current directory and add reference to new directory dir.

void	SetName (const char *name) override
	Change the name of this TEventList.

virtual void	SetReapplyCut (bool apply=false)

virtual void	Sort ()
	Sort list entries in increasing order.

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

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

virtual void	Subtract (const TEventList *list)
	Remove elements from this list that are present in alist.

Public Member Functions inherited from TNamed
	TNamed ()

	TNamed (const char name, const char title)

	TNamed (const TNamed &named)
	TNamed copy ctor.

	TNamed (const TString &name, const TString &title)

virtual	~TNamed ()
	TNamed destructor.

void	Clear (Option_t *option="") override
	Set name and title to empty strings ("").

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

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

void	Copy (TObject &named) const override
	Copy this to obj.

virtual void	FillBuffer (char *&buffer)
	Encode TNamed into output buffer.

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

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

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

TClass *	IsA () const override

Bool_t	IsSortable () const override

void	ls (Option_t *option="") const override
	List TNamed name and title.

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

void	Print (Option_t *option="") const override
	Print TNamed name and title.

virtual void	SetNameTitle (const char name, const char title)
	Set all the TNamed parameters (name and title).

virtual void	SetTitle (const char *title="")
	Set the title of the TNamed.

virtual Int_t	Sizeof () const
	Return size of the TNamed part of the TObject.

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

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

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	Delete (Option_t *option="")
	Delete this object.

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 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 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).

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

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).

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 TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

Static Public Member Functions inherited from TNamed
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.

Protected Attributes
Int_t	fDelta
	Increment size.

TDirectory *	fDirectory
	! Pointer to directory holding this tree

Long64_t *	fList
	[fN]Array of elements

Int_t	fN
	Number of elements in the list.

bool	fReapply
	If true, TTree::Draw will 'reapply' the original cut.

Int_t	fSize
	Size of array.

Protected Attributes inherited from TNamed
TString	fName

TString	fTitle

Friends
TEventList	operator* (const TEventList &list1, const TEventList &list2)
	Intersection.

TEventList	operator+ (const TEventList &list1, const TEventList &list2)
	Addition.

TEventList	operator- (const TEventList &list1, const TEventList &list2)
	Subtraction.

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 <TEventList.h>

Inheritance diagram for TEventList:

[legend]

Constructor & Destructor Documentation

◆ TEventList() [1/3]

TEventList::TEventList ( )

Default constructor for a EventList.

Definition at line 63 of file TEventList.cxx.

◆ TEventList() [2/3]

TEventList::TEventList	(	const char *	name,
		const char *	title = `""`,
		Int_t	initsize = `0`,
		Int_t	delta = `0`
	)

Create a EventList.

This Eventlist is added to the list of objects in current directory.

Definition at line 78 of file TEventList.cxx.

◆ TEventList() [3/3]

TEventList::TEventList ( const TEventList & list )

Copy constructor.

Definition at line 94 of file TEventList.cxx.

◆ ~TEventList()

TEventList::~TEventList ( )

override

Default destructor for a EventList.

Definition at line 109 of file TEventList.cxx.

Member Function Documentation

◆ Add()

void TEventList::Add ( const TEventList * alist )

virtual

Merge contents of alist with this list.

Both alist and this list are assumed to be sorted prior to this call

Definition at line 121 of file TEventList.cxx.

◆ Class()

static TClass * TEventList::Class ( )

static

Returns: TClass describing this class

◆ Class_Name()

static const char * TEventList::Class_Name ( )

static

Returns: Name of this class

◆ Class_Version()

static constexpr Version_t TEventList::Class_Version ( )

inlinestaticconstexpr

Returns: Version of this class

Definition at line 77 of file TEventList.h.

◆ Clear()

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

inlineoverridevirtual

Reimplemented from TObject.

Definition at line 47 of file TEventList.h.

◆ Contains()

bool TEventList::Contains ( Long64_t entry )

virtual

Return TRUE if list contains entry.

Definition at line 167 of file TEventList.cxx.

◆ ContainsRange()

bool TEventList::ContainsRange	(	Long64_t	entrymin,
		Long64_t	entrymax
	)

virtual

Return TRUE if list contains entries from entrymin to entrymax included.

Definition at line 176 of file TEventList.cxx.

◆ DeclFileName()

static const char * TEventList::DeclFileName ( )

inlinestatic

Returns: Name of the file containing the class declaration

Definition at line 77 of file TEventList.h.

◆ DirectoryAutoAdd()

void TEventList::DirectoryAutoAdd ( TDirectory * dir )

virtual

Called by TKey and others to automatically add us to a directory when we are read from a file.

Definition at line 188 of file TEventList.cxx.

◆ Enter()

void TEventList::Enter ( Long64_t entry )

virtual

Enter element entry into the list.

Definition at line 196 of file TEventList.cxx.

◆ GetDirectory()

TDirectory * TEventList::GetDirectory ( ) const

inline

Definition at line 52 of file TEventList.h.

◆ GetEntry()

Long64_t TEventList::GetEntry ( Int_t index ) const

virtual

Return value of entry at index in the list.

Return -1 if index is not in the list range.

Definition at line 227 of file TEventList.cxx.

◆ GetIndex()

Int_t TEventList::GetIndex ( Long64_t entry ) const

virtual

Return index in the list of element with value entry array is supposed to be sorted prior to this call.

If match is found, function returns position of element. If no match found, function returns -1.

Definition at line 240 of file TEventList.cxx.

◆ GetList()

virtual Long64_t * TEventList::GetList ( ) const

inlinevirtual

Definition at line 55 of file TEventList.h.

◆ GetN()

virtual Int_t TEventList::GetN ( ) const

inlinevirtual

Definition at line 56 of file TEventList.h.

◆ GetReapplyCut()

virtual bool TEventList::GetReapplyCut ( ) const

inlinevirtual

Definition at line 57 of file TEventList.h.

◆ GetSize()

virtual Int_t TEventList::GetSize ( ) const

inlinevirtual

Definition at line 58 of file TEventList.h.

◆ Intersect()

void TEventList::Intersect ( const TEventList * list )

virtual

Remove elements from this list that are NOT present in alist.

Definition at line 257 of file TEventList.cxx.

◆ IsA()

TClass * TEventList::IsA ( ) const

inlineoverridevirtual

Returns: TClass describing current object

Reimplemented from TObject.

Definition at line 77 of file TEventList.h.

◆ Merge()

Int_t TEventList::Merge ( TCollection * list )

virtual

Merge entries in all the TEventList in the collection in this event list.

Definition at line 284 of file TEventList.cxx.

◆ operator=()

TEventList & TEventList::operator= ( const TEventList & list )

Assingment.

Definition at line 462 of file TEventList.cxx.

◆ Print()

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

overridevirtual

Print contents of this list.

Reimplemented from TObject.

Definition at line 307 of file TEventList.cxx.

◆ Reset()

void TEventList::Reset ( Option_t * option = "" )

virtual

Reset number of entries in event list.

Definition at line 333 of file TEventList.cxx.

◆ Resize()

void TEventList::Resize ( Int_t delta = 0 )

virtual

Resize list by delta entries.

Definition at line 341 of file TEventList.cxx.

◆ SetDelta()

virtual void TEventList::SetDelta ( Int_t delta = 100 )

inlinevirtual

Definition at line 64 of file TEventList.h.

◆ SetDirectory()

void TEventList::SetDirectory ( TDirectory * dir )

virtual

Remove reference to this EventList from current directory and add reference to new directory dir.

dir can be 0 in which case the list does not belong to any directory.

Definition at line 356 of file TEventList.cxx.

◆ SetName()

void TEventList::SetName ( const char * name )

overridevirtual

Change the name of this TEventList.

Reimplemented from TNamed.

Definition at line 367 of file TEventList.cxx.

◆ SetReapplyCut()

virtual void TEventList::SetReapplyCut ( bool apply = false )

inlinevirtual

Definition at line 67 of file TEventList.h.

◆ Sort()

void TEventList::Sort ( )

virtual

Sort list entries in increasing order.

Definition at line 379 of file TEventList.cxx.

◆ Streamer()

void TEventList::Streamer ( TBuffer & b )

overridevirtual

Stream an object of class TEventList.

Reimplemented from TObject.

Definition at line 400 of file TEventList.cxx.

◆ StreamerNVirtual()

void TEventList::StreamerNVirtual ( TBuffer & ClassDef_StreamerNVirtual_b )

inline

Definition at line 77 of file TEventList.h.

◆ Subtract()

void TEventList::Subtract ( const TEventList * list )

virtual

Remove elements from this list that are present in alist.

Definition at line 435 of file TEventList.cxx.

Friends And Related Symbol Documentation

◆ operator*

TEventList operator*	(	const TEventList &	list1,
		const TEventList &	list2
	)

friend

Intersection.

Definition at line 502 of file TEventList.cxx.

◆ operator+

TEventList operator+	(	const TEventList &	list1,
		const TEventList &	list2
	)

friend

Addition.

Definition at line 482 of file TEventList.cxx.

◆ operator-

TEventList operator-	(	const TEventList &	list1,
		const TEventList &	list2
	)

friend

Subtraction.

Definition at line 492 of file TEventList.cxx.

Member Data Documentation

◆ fDelta

Int_t TEventList::fDelta

protected

Increment size.

Definition at line 36 of file TEventList.h.

◆ fDirectory

TDirectory* TEventList::fDirectory

protected

! Pointer to directory holding this tree

Definition at line 39 of file TEventList.h.

◆ fList

Long64_t* TEventList::fList

protected

[fN]Array of elements

Definition at line 38 of file TEventList.h.

◆ fN

Int_t TEventList::fN

protected

Number of elements in the list.

Definition at line 34 of file TEventList.h.

◆ fReapply

bool TEventList::fReapply

protected

If true, TTree::Draw will 'reapply' the original cut.

Definition at line 37 of file TEventList.h.

◆ fSize

Int_t TEventList::fSize

protected

Size of array.

Definition at line 35 of file TEventList.h.

Libraries for TEventList:

[legend]

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

tree/tree/inc/TEventList.h
tree/tree/src/TEventList.cxx

Legacy Code

Public Member Functions

Static Public Member Functions

Protected Attributes

Friends

Additional Inherited Members

Constructor & Destructor Documentation

◆ TEventList() [1/3]

◆ TEventList() [2/3]

◆ TEventList() [3/3]

◆ ~TEventList()

Member Function Documentation

◆ Add()

◆ Class()

◆ Class_Name()

◆ Class_Version()

◆ Clear()

◆ Contains()

◆ ContainsRange()

◆ DeclFileName()

◆ DirectoryAutoAdd()

◆ Enter()

◆ GetDirectory()

◆ GetEntry()

◆ GetIndex()

◆ GetList()

◆ GetN()

◆ GetReapplyCut()

◆ GetSize()

◆ Intersect()

◆ IsA()

◆ Merge()

◆ operator=()

◆ Print()

◆ Reset()

◆ Resize()

◆ SetDelta()

◆ SetDirectory()

◆ SetName()

◆ SetReapplyCut()

◆ Sort()

◆ Streamer()

◆ StreamerNVirtual()

◆ Subtract()

Friends And Related Symbol Documentation

◆ operator*

◆ operator+

◆ operator-

Member Data Documentation

◆ fDelta

◆ fDirectory

◆ fList

◆ fN

◆ fReapply

◆ fSize