A TTree is a list of TBranches.

A TBranch supports:

The list of TLeaf describing this branch.
The list of TBasket (branch buffers).

See TBranch structure in TTree.

See also specialized branches:

TBranchObject in case the branch is one object
TBranchClones in case the branch is an array of clone objects

Definition at line 57 of file TBranch.h.

Public Member Functions
	TBranch ()
	Default constructor. Used for I/O by default. More...

	TBranch (TTree tree, const char name, void address, const char leaflist, Int_t basketsize=32000, Int_t compress=-1)
	Create a Branch as a child of a Tree. More...

	TBranch (TBranch parent, const char name, void address, const char leaflist, Int_t basketsize=32000, Int_t compress=-1)
	Create a Branch as a child of another Branch. More...

virtual	~TBranch ()
	Destructor. More...

virtual void	AddBasket (TBasket &b, Bool_t ondisk, Long64_t startEntry)
	Add the basket to this branch. More...

virtual void	AddLastBasket (Long64_t startEntry)
	Add the start entry of the write basket (not yet created) More...

Int_t	BackFill ()
	Loop on all leaves of this branch to back fill Basket buffer. More...

virtual void	Browse (TBrowser *b)
	Browser interface. More...

virtual void	DeleteBaskets (Option_t *option="")
	Loop on all branch baskets. More...

virtual void	DropBaskets (Option_t *option="")
	Loop on all branch baskets. More...

void	ExpandBasketArrays ()
	Increase BasketEntry buffer of a minimum of 10 locations and a maximum of 50 per cent of current size. More...

Int_t	Fill ()

virtual Int_t	FillImpl (ROOT::Internal::TBranchIMTHelper *)
	Loop on all leaves of this branch to fill Basket buffer. More...

virtual TBranch *	FindBranch (const char *name)
	Find the immediate sub-branch with passed name. More...

virtual TLeaf *	FindLeaf (const char *name)
	Find the leaf corresponding to the name 'searchname'. More...

Int_t	FlushBaskets ()
	Flush to disk all the baskets of this branch and any of subbranches. More...

Int_t	FlushOneBasket (UInt_t which)
	If we have a write basket in memory and it contains some entries and has not yet been written to disk, we write it and delete it from memory. More...

virtual char *	GetAddress () const

TBasket *	GetBasket (Int_t basket)
	Return pointer to basket basketnumber in this Branch. More...

Int_t *	GetBasketBytes () const

Long64_t *	GetBasketEntry () const

virtual Long64_t	GetBasketSeek (Int_t basket) const
	Return address of basket in the file. More...

virtual Int_t	GetBasketSize () const

virtual TList *	GetBrowsables ()
	Returns (and, if 0, creates) browsable objects for this branch See TVirtualBranchBrowsable::FillListOfBrowsables. More...

virtual const char *	GetClassName () const
	Return the name of the user class whose content is stored in this branch, if any. More...

Int_t	GetCompressionAlgorithm () const

Int_t	GetCompressionLevel () const

Int_t	GetCompressionSettings () const

TDirectory *	GetDirectory () const

Long64_t	GetEntries () const

virtual Int_t	GetEntry (Long64_t entry=0, Int_t getall=0)
	Read all leaves of entry and return total number of bytes read. More...

virtual Int_t	GetEntryExport (Long64_t entry, Int_t getall, TClonesArray *list, Int_t n)
	Read all leaves of an entry and export buffers to real objects in a TClonesArray list. More...

Long64_t	GetEntryNumber () const

Int_t	GetEntryOffsetLen () const

Int_t	GetEvent (Long64_t entry=0)

virtual Int_t	GetExpectedType (TClass *&clptr, EDataType &type)
	Fill expectedClass and expectedType with information on the data type of the object/values contained in this branch (and thus the type of pointers expected to be passed to Set[Branch]Address return 0 in case of success and > 0 in case of failure. More...

virtual TFile *	GetFile (Int_t mode=0)
	Return pointer to the file where branch buffers reside, returns 0 in case branch buffers reside in the same file as tree header. More...

const char *	GetFileName () const

Long64_t	GetFirstEntry () const

const char *	GetIconName () const
	Return icon name depending on type of branch. More...

virtual TLeaf *	GetLeaf (const char *name) const
	Return pointer to the 1st Leaf named name in thisBranch. More...

TObjArray *	GetListOfBaskets ()

TObjArray *	GetListOfBranches ()

TObjArray *	GetListOfLeaves ()

virtual Bool_t	GetMakeClass () const
	Return whether this branch is in a mode where the object are decomposed or not (Also known as MakeClass mode). More...

Int_t	GetMaxBaskets () const

TBranch *	GetMother () const
	Get our top-level parent branch in the tree. More...

Int_t	GetNleaves () const

Int_t	GetOffset () const

Int_t	GetReadBasket () const

Long64_t	GetReadEntry () const

virtual Int_t	GetRow (Int_t row)
	Return all elements of one row unpacked in internal array fValues [Actually just returns 1 (?)]. More...

Int_t	GetSplitLevel () const

TBranch *	GetSubBranch (const TBranch *br) const
	Find the parent branch of child. More...

Long64_t	GetTotalSize (Option_t *option="") const
	Return total number of bytes in the branch (including current buffer) More...

Long64_t	GetTotBytes (Option_t *option="") const
	Return total number of bytes in the branch (excluding current buffer) if option ="*" includes all sub-branches of this branch too. More...

TBuffer *	GetTransientBuffer (Int_t size)
	Returns the transient buffer currently used by this TBranch for reading/writing baskets. More...

TTree *	GetTree () const

Int_t	GetWriteBasket () const

Long64_t	GetZipBytes (Option_t *option="") const
	Return total number of zip bytes in the branch if option ="*" includes all sub-branches of this branch too. More...

Bool_t	IsAutoDelete () const
	Return kTRUE if an existing object in a TBranchObject must be deleted. More...

Bool_t	IsFolder () const
	Return kTRUE if more than one leaf or browsables, kFALSE otherwise. More...

virtual void	KeepCircular (Long64_t maxEntries)
	keep a maximum of fMaxEntries in memory More...

virtual Int_t	LoadBaskets ()
	Baskets associated to this branch are forced to be in memory. More...

virtual void	Print (Option_t *option="") const
	Print TBranch parameters. More...

virtual void	ReadBasket (TBuffer &b)
	Loop on all leaves of this branch to read Basket buffer. More...

virtual void	Refresh (TBranch *b)
	Refresh this branch using new information in b This function is called by TTree::Refresh. More...

virtual void	Reset (Option_t *option="")
	Reset a Branch. More...

virtual void	ResetAddress ()
	Reset the address of the branch. More...

virtual void	ResetAfterMerge (TFileMergeInfo *)
	Reset a Branch. More...

virtual void	ResetReadEntry ()

virtual void	SetAddress (void *add)
	Set address of this branch. More...

virtual void	SetAutoDelete (Bool_t autodel=kTRUE)
	Set the automatic delete bit. More...

virtual void	SetBasketSize (Int_t buffsize)
	Set the basket size The function makes sure that the basket size is greater than fEntryOffsetlen. More...

virtual void	SetBufferAddress (TBuffer *entryBuffer)
	Set address of this branch directly from a TBuffer to avoid streaming. More...

void	SetCompressionAlgorithm (Int_t algorithm=0)
	Set compression algorithm. More...

void	SetCompressionLevel (Int_t level=1)
	Set compression level. More...

void	SetCompressionSettings (Int_t settings=1)
	Set compression settings. More...

virtual void	SetEntries (Long64_t entries)
	Set the number of entries in this branch. More...

virtual void	SetEntryOffsetLen (Int_t len, Bool_t updateSubBranches=kFALSE)
	Update the default value for the branch's fEntryOffsetLen if and only if it was already non zero (and the new value is not zero) If updateExisting is true, also update all the existing branches. More...

virtual void	SetFile (TFile *file=0)
	Set file where this branch writes/reads its buffers. More...

virtual void	SetFile (const char *filename)
	Set file where this branch writes/reads its buffers. More...

virtual void	SetFirstEntry (Long64_t entry)
	set the first entry number (case of TBranchSTL) More...

virtual Bool_t	SetMakeClass (Bool_t decomposeObj=kTRUE)
	Set the branch in a mode where the object are decomposed (Also known as MakeClass mode). More...

virtual void	SetObject (void *objadd)
	Set object this branch is pointing to. More...

virtual void	SetOffset (Int_t offset=0)

virtual void	SetStatus (Bool_t status=1)
	Set branch status to Process or DoNotProcess. More...

virtual void	SetTree (TTree *tree)

virtual void	SetupAddresses ()
	If the branch address is not set, we set all addresses starting with the top level parent branch. More...

virtual void	UpdateAddress ()

virtual void	UpdateFile ()
	Refresh the value of fDirectory (i.e. More...

Public Member Functions inherited from TNamed
	TNamed ()

	TNamed (const char name, const char title)

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

	TNamed (const TNamed &named)
	TNamed copy ctor. More...

virtual	~TNamed ()

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

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

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

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

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

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

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

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

virtual Bool_t	IsSortable () const

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

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

virtual void	SetName (const char *name)
	Set the name of the TNamed. More...

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

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

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

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

	TObject (const TObject &object)
	TObject copy ctor. More...

virtual	~TObject ()
	TObject destructor. More...

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

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

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

virtual void	Delete (Option_t *option="")
	Delete this object. More...

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

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

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

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

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

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

virtual void	Execute (const char method, const char params, Int_t *error=0)
	Execute method on this object with the given parameter string, e.g. More...

virtual void	Execute (TMethod method, TObjArray params, Int_t *error=0)
	Execute method on this object with parameters stored in the TObjArray. More...

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

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

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

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

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

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

virtual Option_t *	GetOption () const

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

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

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

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

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

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

void	InvertBit (UInt_t f)

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

Bool_t	IsOnHeap () const

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). More...

virtual Bool_t	Notify ()
	This method must be overridden to handle object notification. More...

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

void	operator delete (void *ptr)
	Operator delete. More...

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

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. More...

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

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

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

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

void	ResetBit (UInt_t f)

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

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

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

void	SetBit (UInt_t f)

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

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

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

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. More...

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

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

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

Public Member Functions inherited from TAttFill
	TAttFill ()
	AttFill default constructor. More...

	TAttFill (Color_t fcolor, Style_t fstyle)
	AttFill normal constructor. More...

virtual	~TAttFill ()
	AttFill destructor. More...

void	Copy (TAttFill &attfill) const
	Copy this fill attributes to a new TAttFill. More...

virtual Color_t	GetFillColor () const
	Return the fill area color. More...

virtual Style_t	GetFillStyle () const
	Return the fill area style. More...

virtual Bool_t	IsTransparent () const

virtual void	Modify ()
	Change current fill area attributes if necessary. More...

virtual void	ResetAttFill (Option_t *option="")
	Reset this fill attributes to default values. More...

virtual void	SaveFillAttributes (std::ostream &out, const char *name, Int_t coldef=1, Int_t stydef=1001)
	Save fill attributes as C++ statement(s) on output stream out. More...

virtual void	SetFillAttributes ()
	Invoke the DialogCanvas Fill attributes. More...

virtual void	SetFillColor (Color_t fcolor)
	Set the fill area color. More...

virtual void	SetFillColorAlpha (Color_t fcolor, Float_t falpha)
	Set a transparent fill color. More...

virtual void	SetFillStyle (Style_t fstyle)
	Set the fill area style. More...

Static Public Member Functions
static void	ResetCount ()
	Static function resetting fgCount. More...

Static Public Member Functions inherited from TObject
static Long_t	GetDtorOnly ()
	Return destructor only flag. More...

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

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

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

Protected Types
enum	EStatusBits { kAutoDelete = BIT(15), kDoNotUseBufferMap = BIT(22) }

typedef void(TBranch::*	FillLeaves_t) (TBuffer &b)

typedef void(TBranch::*	ReadLeaves_t) (TBuffer &b)

Protected Member Functions
void	FillLeavesImpl (TBuffer &b)
	Loop on all leaves of this branch to fill Basket buffer. More...

TBasket *	GetFreshBasket ()
	Return a fresh basket by either resusing an existing basket that needs to be drop (according to TTree::MemoryFull) or create a new one. More...

TString	GetRealFileName () const
	Get real file name. More...

void	Init (const char name, const char leaflist, Int_t compress)

void	ReadLeaves0Impl (TBuffer &b)
	Read zero leaves without the overhead of a loop. More...

void	ReadLeaves1Impl (TBuffer &b)
	Read one leaf without the overhead of a loop. More...

void	ReadLeaves2Impl (TBuffer &b)
	Read two leaves without the overhead of a loop. More...

void	ReadLeavesImpl (TBuffer &b)
	Loop on all leaves of this branch to read Basket buffer. More...

void	SetSkipZip (Bool_t skip=kTRUE)

Int_t	WriteBasket (TBasket *basket, Int_t where)

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). More...

void	MakeZombie ()

Protected Attributes
char *	fAddress
	! Address of 1st leaf (variable or object) More...

Int_t *	fBasketBytes
	[fMaxBaskets] Length of baskets on file More...

Long64_t *	fBasketEntry
	[fMaxBaskets] Table of first entry in each basket More...

TObjArray	fBaskets
	-> List of baskets of this branch More...

Long64_t *	fBasketSeek
	[fMaxBaskets] Addresses of baskets on file More...

Int_t	fBasketSize
	Initial Size of Basket Buffer. More...

TObjArray	fBranches
	-> List of Branches of this branch More...

TList *	fBrowsables
	! List of TVirtualBranchBrowsables used for Browse() More...

Int_t	fCompress
	Compression level and algorithm. More...

TBasket *	fCurrentBasket
	! Pointer to the current basket. More...

TDirectory *	fDirectory
	! Pointer to directory where this branch buffers are stored More...

Long64_t	fEntries
	Number of entries. More...

TBuffer *	fEntryBuffer
	! Buffer used to directly pass the content without streaming More...

Long64_t	fEntryNumber
	Current entry number (last one filled in this branch) More...

Int_t	fEntryOffsetLen
	Initial Length of fEntryOffset table in the basket buffers. More...

TString	fFileName
	Name of file where buffers are stored ("" if in same file as Tree header) More...

FillLeaves_t	fFillLeaves
	! Pointer to the FillLeaves implementation to use. More...

Long64_t	fFirstBasketEntry
	! First entry in the current basket. More...

Long64_t	fFirstEntry
	Number of the first entry in this branch. More...

TObjArray	fLeaves
	-> List of leaves of this branch More...

Int_t	fMaxBaskets
	Maximum number of Baskets so far. More...

TBranch *	fMother
	! Pointer to top-level parent branch in the tree. More...

Int_t	fNBaskets
	! Number of baskets in memory More...

Long64_t	fNextBasketEntry
	! Next entry that will requires us to go to the next basket More...

Int_t	fNleaves
	! Number of leaves More...

Int_t	fOffset
	Offset of this branch. More...

TBranch *	fParent
	! Pointer to parent branch. More...

Int_t	fReadBasket
	! Current basket number when reading More...

Long64_t	fReadEntry
	! Current entry number when reading More...

ReadLeaves_t	fReadLeaves
	! Pointer to the ReadLeaves implementation to use. More...

Bool_t	fSkipZip
	! After being read, the buffer will not be unzipped. More...

Int_t	fSplitLevel
	Branch split level. More...

Long64_t	fTotBytes
	Total number of bytes in all leaves before compression. More...

TBuffer *	fTransientBuffer
	! Pointer to the current transient buffer. More...

TTree *	fTree
	! Pointer to Tree header More...

Int_t	fWriteBasket
	Last basket number written. More...

Long64_t	fZipBytes
	Total number of bytes in all leaves after compression. More...

Protected Attributes inherited from TNamed
TString	fName

TString	fTitle

Protected Attributes inherited from TAttFill
Color_t	fFillColor
	Fill area color. More...

Style_t	fFillStyle
	Fill area style. More...

Static Protected Attributes
static Int_t	fgCount = 0
	! branch counter More...

Private Member Functions
	TBranch (const TBranch &)=delete

Int_t	FillEntryBuffer (TBasket basket, TBuffer buf, Int_t &lnew)
	Copy the data from fEntryBuffer into the current basket. More...

TBranch &	operator= (const TBranch &)=delete

Int_t	WriteBasketImpl (TBasket basket, Int_t where, ROOT::Internal::TBranchIMTHelper )
	Write the current basket to disk and return the number of bytes written to the file. More...

Friends
class	TTree

class	TTreeCloner

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

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

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

#include <TBranch.h>

Inheritance diagram for TBranch:

[legend]

Member Typedef Documentation

◆ FillLeaves_t

typedef void(TBranch::* TBranch::FillLeaves_t) (TBuffer &b)

protected

Definition at line 109 of file TBranch.h.

◆ ReadLeaves_t

typedef void(TBranch::* TBranch::ReadLeaves_t) (TBuffer &b)

protected

Definition at line 107 of file TBranch.h.

Member Enumeration Documentation

◆ EStatusBits

enum TBranch::EStatusBits

protected

Enumerator
kAutoDelete
kDoNotUseBufferMap

Definition at line 64 of file TBranch.h.

Constructor & Destructor Documentation

◆ TBranch() [1/4]

TBranch::TBranch ( const TBranch & )

privatedelete

◆ TBranch() [2/4]

TBranch::TBranch ( )

Default constructor. Used for I/O by default.

Definition at line 76 of file TBranch.cxx.

◆ TBranch() [3/4]

TBranch::TBranch	(	TTree *	tree,
		const char *	name,
		void *	address,
		const char *	leaflist,
		Int_t	basketsize = `32000`,
		Int_t	compress = `-1`
	)

Create a Branch as a child of a Tree.

address is the address of the first item of a structure or the address of a pointer to an object (see example in TTree.cxx).
leaflist is the concatenation of all the variable names and types separated by a colon character : The variable name and the variable type are separated by a slash (/). The variable type must be 1 character. (Characters after the first are legal and will be appended to the visible name of the leaf, but have no effect.) If no type is given, the type of the variable is assumed to be the same as the previous variable. If the first variable does not have a type, it is assumed of type F by default. The list of currently supported types is given below:
- C : a character string terminated by the 0 character
- B : an 8 bit signed integer (Char_t)
- b : an 8 bit unsigned integer (UChar_t)
- S : a 16 bit signed integer (Short_t)
- s : a 16 bit unsigned integer (UShort_t)
- I : a 32 bit signed integer (Int_t)
- i : a 32 bit unsigned integer (UInt_t)
- F : a 32 bit floating point (Float_t)
- D : a 64 bit floating point (Double_t)
- L : a 64 bit signed integer (Long64_t)
- l : a 64 bit unsigned integer (ULong64_t)
- O : [the letter o, not a zero] a boolean (Bool_t)
Arrays of values are supported with the following syntax:
- If leaf name has the form var[nelem], where nelem is alphanumeric, then if nelem is a leaf name, it is used as the variable size of the array, otherwise return 0. The leaf referred to by nelem MUST be an int (/I),
- If leaf name has the form var[nelem], where nelem is a non-negative integers, then it is used as the fixed size of the array.
- If leaf name has the form of a multi dimension array (e.g. var[nelem][nelem2]) where nelem and nelem2 are non-negative integers) then it is used as a 2 dimensional array of fixed size.
- Any of other form is not supported.

Note that the TTree will assume that all the item are contiguous in memory. On some platform, this is not always true of the member of a struct or a class, due to padding and alignment. Sorting your data member in order of decreasing sizeof usually leads to their being contiguous in memory.

bufsize is the buffer size in bytes for this branch The default value is 32000 bytes and should be ok for most cases. You can specify a larger value (e.g. 256000) if your Tree is not split and each entry is large (Megabytes) A small value for bufsize is optimum if you intend to access the entries in the Tree randomly and your Tree is in split mode.

See an example of a Branch definition in the TTree constructor.

Note that in case the data type is an object, this branch can contain only this object.

Note that this function is invoked by TTree::Branch

Definition at line 179 of file TBranch.cxx.

◆ TBranch() [4/4]

TBranch::TBranch	(	TBranch *	parent,
		const char *	name,
		void *	address,
		const char *	leaflist,
		Int_t	basketsize = `32000`,
		Int_t	compress = `-1`
	)

Create a Branch as a child of another Branch.

See documentation for TBranch::TBranch(TTree *, const char *, void *, const char *, Int_t, Int_t)

Definition at line 229 of file TBranch.cxx.

◆ ~TBranch()

TBranch::~TBranch ( )

virtual

Destructor.

Definition at line 417 of file TBranch.cxx.

Member Function Documentation

◆ AddBasket()

void TBranch::AddBasket	(	TBasket &	b,
		Bool_t	ondisk,
		Long64_t	startEntry
	)

virtual

Add the basket to this branch.

Warning: if the basket are not 'flushed/copied' in the same order as they were created, this will induce a slow down in the insert (since we'll need to move all the record that are entere 'too early'). Warning we also assume that the current write basket is not present (aka has been removed).

Definition at line 510 of file TBranch.cxx.

◆ AddLastBasket()

void TBranch::AddLastBasket ( Long64_t startEntry )

virtual

Add the start entry of the write basket (not yet created)

Definition at line 576 of file TBranch.cxx.

◆ BackFill()

Int_t TBranch::BackFill ( )

Loop on all leaves of this branch to back fill Basket buffer.

Use this routine instead of TBranch::Fill when filling a branch individually to catch up with the number of entries already in the TTree.

First it calls TBranch::Fill and then if the number of entries of the branch reach one of TTree cluster's boundary, the basket is flushed.

The function returns the number of bytes committed to the memory basket. If a write error occurs, the number of bytes returned is -1. If no data are written, because e.g. the branch is disabled, the number of bytes returned is 0.

To insure that the baskets of each cluster are located close by in the file, when back-filling multiple branches make sure to call BackFill for the same entry for all the branches consecutively

for( auto e = 0; e < tree->GetEntries(); ++e ) { // loop over entries.
  for( auto branch : branchCollection) {
     ... Make change to the data associated with the branch ...
     branch->BackFill();
  }
}
// Since we loop over all the branches for each new entry
// all the baskets for a cluster are consecutive in the file.

rather than doing all the entries of one branch at a time.

// Do NOT do things in the following order, it will lead to
// poorly clustered files.
for(auto branch : branchCollection) {
  for( auto e = 0; e < tree->GetEntries(); ++e ) { // loop over entries.
     ... Make change to the data associated with the branch ...
     branch->BackFill();
  }
}
// Since we loop over all the entries for one branch
// all the baskets for that branch are consecutive.

Definition at line 634 of file TBranch.cxx.

◆ Browse()

void TBranch::Browse ( TBrowser * b )

virtual

Browser interface.

Reimplemented from TObject.

Reimplemented in TBranchElement, TBranchClones, TBranchObject, THbookBranch, and TBranchSTL.

Definition at line 653 of file TBranch.cxx.

◆ DeleteBaskets()

void TBranch::DeleteBaskets ( Option_t * option = "" )

virtual

Loop on all branch baskets.

If the file where branch buffers reside is writable, free the disk space associated to the baskets of the branch, then call Reset(). If the option contains "all", delete also the baskets for the subbranches. The branch is reset.

NOTE that this function must be used with extreme care. Deleting branch baskets fragments the file and may introduce inefficiencies when adding new entries in the Tree or later on when reading the Tree.

Definition at line 680 of file TBranch.cxx.

◆ DropBaskets()

void TBranch::DropBaskets ( Option_t * options = "" )

virtual

Loop on all branch baskets.

Drop all baskets from memory except readbasket. If the option contains "all", drop all baskets including read- and write-baskets (unless they are not stored individually on disk). The option "all" also lead to DropBaskets being called on the sub-branches.

Definition at line 711 of file TBranch.cxx.

◆ ExpandBasketArrays()

void TBranch::ExpandBasketArrays ( )

Increase BasketEntry buffer of a minimum of 10 locations and a maximum of 50 per cent of current size.

Definition at line 779 of file TBranch.cxx.

◆ Fill()

Int_t TBranch::Fill ( )

inline

Definition at line 144 of file TBranch.h.

◆ FillEntryBuffer()

Int_t TBranch::FillEntryBuffer	(	TBasket *	basket,
		TBuffer *	buf,
		Int_t &	lnew
	)

private

Copy the data from fEntryBuffer into the current basket.

Definition at line 882 of file TBranch.cxx.

◆ FillImpl()

Int_t TBranch::FillImpl ( ROOT::Internal::TBranchIMTHelper * imtHelper )

virtual

Loop on all leaves of this branch to fill Basket buffer.

If TBranchIMTHelper is non-null and it is time to WriteBasket, then we will use TBB to compress in parallel.

The function returns the number of bytes committed to the memory basket. If a write error occurs, the number of bytes returned is -1. If no data are written, because e.g. the branch is disabled, the number of bytes returned is 0.

Reimplemented in TBranchElement, TBranchObject, TBranchRef, TBranchSTL, and TBranchClones.

Definition at line 810 of file TBranch.cxx.

◆ FillLeavesImpl()

void TBranch::FillLeavesImpl ( TBuffer & b )

protected

Loop on all leaves of this branch to fill Basket buffer.

Definition at line 1962 of file TBranch.cxx.

◆ FindBranch()

TBranch * TBranch::FindBranch ( const char * name )

virtual

Find the immediate sub-branch with passed name.

Reimplemented in TBranchElement.

Definition at line 981 of file TBranch.cxx.

◆ FindLeaf()

TLeaf * TBranch::FindLeaf ( const char * name )

virtual

Find the leaf corresponding to the name 'searchname'.

Reimplemented in TBranchElement.

Definition at line 1027 of file TBranch.cxx.

◆ FlushBaskets()

Int_t TBranch::FlushBaskets ( )

Flush to disk all the baskets of this branch and any of subbranches.

Return the number of bytes written or -1 in case of write error.

Definition at line 1082 of file TBranch.cxx.

◆ FlushOneBasket()

Int_t TBranch::FlushOneBasket ( UInt_t ibasket )

If we have a write basket in memory and it contains some entries and has not yet been written to disk, we write it and delete it from memory.

Return the number of bytes written;

Definition at line 1128 of file TBranch.cxx.

◆ GetAddress()

virtual char* TBranch::GetAddress ( ) const

inlinevirtual

Reimplemented in TBranchElement.

Definition at line 151 of file TBranch.h.

◆ GetBasket()

TBasket * TBranch::GetBasket ( Int_t basket )

Return pointer to basket basketnumber in this Branch.

Definition at line 1169 of file TBranch.cxx.

◆ GetBasketBytes()

Int_t* TBranch::GetBasketBytes ( ) const

inline

Definition at line 153 of file TBranch.h.

◆ GetBasketEntry()

Long64_t* TBranch::GetBasketEntry ( ) const

inline

Definition at line 154 of file TBranch.h.

◆ GetBasketSeek()

Long64_t TBranch::GetBasketSeek ( Int_t basket ) const

virtual

Return address of basket in the file.

Definition at line 1234 of file TBranch.cxx.

◆ GetBasketSize()

virtual Int_t TBranch::GetBasketSize ( ) const

inlinevirtual

Definition at line 156 of file TBranch.h.

◆ GetBrowsables()

TList * TBranch::GetBrowsables ( )

virtual

Returns (and, if 0, creates) browsable objects for this branch See TVirtualBranchBrowsable::FillListOfBrowsables.

Definition at line 1244 of file TBranch.cxx.

◆ GetClassName()

const char * TBranch::GetClassName ( ) const

virtual

Return the name of the user class whose content is stored in this branch, if any.

If this branch was created using the 'leaflist' technique, this function returns an empty string.

Reimplemented in TBranchElement, TBranchClones, TBranchObject, and TBranchSTL.

Definition at line 1256 of file TBranch.cxx.

◆ GetCompressionAlgorithm()

Int_t TBranch::GetCompressionAlgorithm ( ) const

inline

Definition at line 232 of file TBranch.h.

◆ GetCompressionLevel()

Int_t TBranch::GetCompressionLevel ( ) const

inline

Definition at line 238 of file TBranch.h.

◆ GetCompressionSettings()

Int_t TBranch::GetCompressionSettings ( ) const

inline

Definition at line 244 of file TBranch.h.

◆ GetDirectory()

TDirectory* TBranch::GetDirectory ( ) const

inline

Definition at line 162 of file TBranch.h.

◆ GetEntries()

Long64_t TBranch::GetEntries ( ) const

inline

Definition at line 187 of file TBranch.h.

◆ GetEntry()

Int_t TBranch::GetEntry	(	Long64_t	entry = `0`,
		Int_t	getall = `0`
	)

virtual

Read all leaves of entry and return total number of bytes read.

The input argument "entry" is the entry number in the current tree. In case of a TChain, the entry number in the current Tree must be found before calling this function. For example:

TChain* chain = ...;
Long64_t localEntry = chain->LoadTree(entry);
branch->GetEntry(localEntry);

The function returns the number of bytes read from the input buffer. If entry does not exist, the function returns 0. If an I/O error occurs, the function returns -1.

See IMPORTANT REMARKS in TTree::GetEntry.

Reimplemented in TBranchElement, TBranchClones, TBranchObject, THbookBranch, and TBranchSTL.

Definition at line 1291 of file TBranch.cxx.

◆ GetEntryExport()

Int_t TBranch::GetEntryExport	(	Long64_t	entry,
		Int_t	getall,
		TClonesArray *	li,
		Int_t	nentries
	)

virtual

Read all leaves of an entry and export buffers to real objects in a TClonesArray list.

Returns total number of bytes read.

Definition at line 1383 of file TBranch.cxx.

◆ GetEntryNumber()

Long64_t TBranch::GetEntryNumber ( ) const

inline

Definition at line 179 of file TBranch.h.

◆ GetEntryOffsetLen()

Int_t TBranch::GetEntryOffsetLen ( ) const

inline

Definition at line 165 of file TBranch.h.

◆ GetEvent()

Int_t TBranch::GetEvent ( Long64_t entry = 0 )

inline

Definition at line 166 of file TBranch.h.

◆ GetExpectedType()

Int_t TBranch::GetExpectedType	(	TClass *&	expectedClass,
		EDataType &	expectedType
	)

virtual

Fill expectedClass and expectedType with information on the data type of the object/values contained in this branch (and thus the type of pointers expected to be passed to Set[Branch]Address return 0 in case of success and > 0 in case of failure.

Reimplemented in TBranchElement, TBranchObject, and TBranchSTL.

Definition at line 1455 of file TBranch.cxx.

◆ GetFile()

TFile * TBranch::GetFile ( Int_t mode = 0 )

virtual

Return pointer to the file where branch buffers reside, returns 0 in case branch buffers reside in the same file as tree header.

If mode is 1 the branch buffer file is recreated.

Definition at line 1474 of file TBranch.cxx.

◆ GetFileName()

const char* TBranch::GetFileName ( ) const

inline

Definition at line 171 of file TBranch.h.

◆ GetFirstEntry()

Long64_t TBranch::GetFirstEntry ( ) const

inline

Definition at line 180 of file TBranch.h.

◆ GetFreshBasket()

TBasket * TBranch::GetFreshBasket ( )

protected

Return a fresh basket by either resusing an existing basket that needs to be drop (according to TTree::MemoryFull) or create a new one.

Definition at line 1509 of file TBranch.cxx.

◆ GetIconName()

const char * TBranch::GetIconName ( ) const

virtual

Return icon name depending on type of branch.

Reimplemented from TObject.

Reimplemented in TBranchElement.

Definition at line 1264 of file TBranch.cxx.

◆ GetLeaf()

TLeaf * TBranch::GetLeaf ( const char * name ) const

virtual

Return pointer to the 1st Leaf named name in thisBranch.

Definition at line 1552 of file TBranch.cxx.

◆ GetListOfBaskets()

TObjArray* TBranch::GetListOfBaskets ( )

inline

Definition at line 181 of file TBranch.h.

◆ GetListOfBranches()

TObjArray* TBranch::GetListOfBranches ( )

inline

Definition at line 182 of file TBranch.h.

◆ GetListOfLeaves()

TObjArray* TBranch::GetListOfLeaves ( )

inline

Definition at line 183 of file TBranch.h.

◆ GetMakeClass()

Bool_t TBranch::GetMakeClass ( ) const

virtual

Return whether this branch is in a mode where the object are decomposed or not (Also known as MakeClass mode).

Reimplemented in TBranchElement.

Definition at line 1615 of file TBranch.cxx.

◆ GetMaxBaskets()

Int_t TBranch::GetMaxBaskets ( ) const

inline

Definition at line 184 of file TBranch.h.

◆ GetMother()

TBranch * TBranch::GetMother ( ) const

Get our top-level parent branch in the tree.

Definition at line 1625 of file TBranch.cxx.

◆ GetNleaves()

Int_t TBranch::GetNleaves ( ) const

inline

Definition at line 185 of file TBranch.h.

◆ GetOffset()

Int_t TBranch::GetOffset ( ) const

inline

Definition at line 172 of file TBranch.h.

◆ GetReadBasket()

Int_t TBranch::GetReadBasket ( ) const

inline

Definition at line 173 of file TBranch.h.

◆ GetReadEntry()

Long64_t TBranch::GetReadEntry ( ) const

inline

Definition at line 174 of file TBranch.h.

◆ GetRealFileName()

TString TBranch::GetRealFileName ( ) const

protected

Get real file name.

Definition at line 1565 of file TBranch.cxx.

◆ GetRow()

Int_t TBranch::GetRow ( Int_t row )

virtual

Return all elements of one row unpacked in internal array fValues [Actually just returns 1 (?)].

Definition at line 1606 of file TBranch.cxx.

◆ GetSplitLevel()

Int_t TBranch::GetSplitLevel ( ) const

inline

Definition at line 186 of file TBranch.h.

◆ GetSubBranch()

TBranch * TBranch::GetSubBranch ( const TBranch * child ) const

Find the parent branch of child.

Return 0 if child is not in this branch hierarchy.

Definition at line 1646 of file TBranch.cxx.

◆ GetTotalSize()

Long64_t TBranch::GetTotalSize ( Option_t * option = "" ) const

Return total number of bytes in the branch (including current buffer)

Definition at line 1684 of file TBranch.cxx.

◆ GetTotBytes()

Long64_t TBranch::GetTotBytes ( Option_t * option = "" ) const

Return total number of bytes in the branch (excluding current buffer) if option ="*" includes all sub-branches of this branch too.

Definition at line 1703 of file TBranch.cxx.

◆ GetTransientBuffer()

TBuffer * TBranch::GetTransientBuffer ( Int_t size )

Returns the transient buffer currently used by this TBranch for reading/writing baskets.

Definition at line 488 of file TBranch.cxx.

◆ GetTree()

TTree* TBranch::GetTree ( ) const

inline

Definition at line 188 of file TBranch.h.

◆ GetWriteBasket()

Int_t TBranch::GetWriteBasket ( ) const

inline

Definition at line 175 of file TBranch.h.

◆ GetZipBytes()

Long64_t TBranch::GetZipBytes ( Option_t * option = "" ) const

Return total number of zip bytes in the branch if option ="*" includes all sub-branches of this branch too.

Definition at line 1721 of file TBranch.cxx.

◆ Init()

void TBranch::Init	(	const char *	name,
		const char *	leaflist,
		Int_t	compress
	)

protected

Definition at line 273 of file TBranch.cxx.

◆ IsAutoDelete()

Bool_t TBranch::IsAutoDelete ( ) const

Return kTRUE if an existing object in a TBranchObject must be deleted.

Definition at line 1738 of file TBranch.cxx.

◆ IsFolder()

Bool_t TBranch::IsFolder ( ) const

virtual

Return kTRUE if more than one leaf or browsables, kFALSE otherwise.

Reimplemented from TObject.

Reimplemented in TBranchElement, TBranchClones, TBranchObject, and TBranchSTL.

Definition at line 1746 of file TBranch.cxx.

◆ KeepCircular()

void TBranch::KeepCircular ( Long64_t maxEntries )

virtual

keep a maximum of fMaxEntries in memory

Definition at line 1758 of file TBranch.cxx.

◆ LoadBaskets()

Int_t TBranch::LoadBaskets ( )

virtual

Baskets associated to this branch are forced to be in memory.

You can call TTree::SetMaxVirtualSize(maxmemory) to instruct the system that the total size of the imported baskets does not exceed maxmemory bytes.

The function returns the number of baskets that have been put in memory. This method may be called to force all baskets of one or more branches in memory when random access to entries in this branch is required. See also TTree::LoadBaskets to load all baskets of all branches in memory.

Definition at line 1784 of file TBranch.cxx.

◆ operator=()

TBranch& TBranch::operator= ( const TBranch & )

privatedelete

◆ Print()

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

virtual

Print TBranch parameters.

If options contains "basketsInfo" print the entry number, location and size of each baskets.

Reimplemented from TNamed.

Reimplemented in TBranchElement, TBranchClones, TBranchObject, TBranchRef, and TBranchSTL.

Definition at line 1816 of file TBranch.cxx.

◆ ReadBasket()

void TBranch::ReadBasket ( TBuffer & b )

virtual

Loop on all leaves of this branch to read Basket buffer.

Definition at line 1919 of file TBranch.cxx.

◆ ReadLeaves0Impl()

void TBranch::ReadLeaves0Impl ( TBuffer & b )

protected

Read zero leaves without the overhead of a loop.

Definition at line 1938 of file TBranch.cxx.

◆ ReadLeaves1Impl()

void TBranch::ReadLeaves1Impl ( TBuffer & b )

protected

Read one leaf without the overhead of a loop.

Definition at line 1945 of file TBranch.cxx.

◆ ReadLeaves2Impl()

void TBranch::ReadLeaves2Impl ( TBuffer & b )

protected

Read two leaves without the overhead of a loop.

Definition at line 1953 of file TBranch.cxx.

◆ ReadLeavesImpl()

void TBranch::ReadLeavesImpl ( TBuffer & b )

protected

Loop on all leaves of this branch to read Basket buffer.

Definition at line 1927 of file TBranch.cxx.

◆ Refresh()

void TBranch::Refresh ( TBranch * b )

virtual

Refresh this branch using new information in b This function is called by TTree::Refresh.

Definition at line 1974 of file TBranch.cxx.

◆ Reset()

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

virtual

Reset a Branch.

Existing buffers are deleted.
Entries, max and min are reset.

Reimplemented in TBranchElement, TBranchClones, TBranchObject, and TBranchRef.

Definition at line 2023 of file TBranch.cxx.

◆ ResetAddress()

void TBranch::ResetAddress ( )

virtual

Reset the address of the branch.

Reimplemented in TBranchElement.

Definition at line 2117 of file TBranch.cxx.

◆ ResetAfterMerge()

void TBranch::ResetAfterMerge ( TFileMergeInfo * )

virtual

Reset a Branch.

Existing buffers are deleted.
Entries, max and min are reset.

Reimplemented in TBranchElement, TBranchClones, TBranchObject, and TBranchRef.

Definition at line 2064 of file TBranch.cxx.

◆ ResetCount()

void TBranch::ResetCount ( )

static

Static function resetting fgCount.

Definition at line 2140 of file TBranch.cxx.

◆ ResetReadEntry()

virtual void TBranch::ResetReadEntry ( )

inlinevirtual

Definition at line 204 of file TBranch.h.

◆ SetAddress()

void TBranch::SetAddress ( void * add )

virtual

Set address of this branch.

Reimplemented in TBranchElement, TBranchClones, TBranchObject, TBranchSTL, and THbookBranch.

Definition at line 2148 of file TBranch.cxx.

◆ SetAutoDelete()

void TBranch::SetAutoDelete ( Bool_t autodel = kTRUE )

virtual

Set the automatic delete bit.

This bit is used by TBranchObject::ReadBasket to decide if an object referenced by a TBranchObject must be deleted or not before reading a new entry.

If autodel is kTRUE, this existing object will be deleted, a new object created by the default constructor, then read from disk by the streamer.

If autodel is kFALSE, the existing object is not deleted. Root assumes that the user is taking care of deleting any internal object or array (this can be done in the streamer).

Reimplemented in TBranchObject.

Definition at line 2182 of file TBranch.cxx.

◆ SetBasketSize()

void TBranch::SetBasketSize ( Int_t buffsize )

virtual

Set the basket size The function makes sure that the basket size is greater than fEntryOffsetlen.

Reimplemented in TBranchElement, TBranchClones, and TBranchObject.

Definition at line 2195 of file TBranch.cxx.

◆ SetBufferAddress()

void TBranch::SetBufferAddress ( TBuffer * buf )

virtual

Set address of this branch directly from a TBuffer to avoid streaming.

Note: We do not take ownership of the buffer.

Definition at line 2211 of file TBranch.cxx.

◆ SetCompressionAlgorithm()

void TBranch::SetCompressionAlgorithm ( Int_t algorithm = 0 )

Set compression algorithm.

Definition at line 2229 of file TBranch.cxx.

◆ SetCompressionLevel()

void TBranch::SetCompressionLevel ( Int_t level = 1 )

Set compression level.

Definition at line 2249 of file TBranch.cxx.

◆ SetCompressionSettings()

void TBranch::SetCompressionSettings ( Int_t settings = 1 )

Set compression settings.

Definition at line 2271 of file TBranch.cxx.

◆ SetEntries()

void TBranch::SetEntries ( Long64_t entries )

virtual

Set the number of entries in this branch.

Reimplemented in THbookBranch.

Definition at line 2304 of file TBranch.cxx.

◆ SetEntryOffsetLen()

void TBranch::SetEntryOffsetLen	(	Int_t	newdefault,
		Bool_t	updateExisting = `kFALSE`
	)

virtual

Update the default value for the branch's fEntryOffsetLen if and only if it was already non zero (and the new value is not zero) If updateExisting is true, also update all the existing branches.

Definition at line 2287 of file TBranch.cxx.

◆ SetFile() [1/2]

void TBranch::SetFile ( TFile * file = 0 )

virtual

Set file where this branch writes/reads its buffers.

By default the branch buffers reside in the file where the Tree was created. If the file name where the tree was created is an absolute path name or an URL (e.g. /castor/... or root://host/...) and if the fname is not an absolute path name or an URL then the path of the tree file is prepended to fname to make the branch file relative to the tree file. In this case one can move the tree + all branch files to a different location in the file system and still access the branch files. The ROOT file will be connected only when necessary. If called by TBranch::Fill (via TBasket::WriteFile), the file will be created with the option "recreate". If called by TBranch::GetEntry (via TBranch::GetBasket), the file will be opened in read mode. To open a file in "update" mode or with a certain compression level, use TBranch::SetFile(TFile *file).

Definition at line 2329 of file TBranch.cxx.

◆ SetFile() [2/2]

void TBranch::SetFile ( const char * fname )

virtual

Set file where this branch writes/reads its buffers.

By default the branch buffers reside in the file where the Tree was created. If the file name where the tree was created is an absolute path name or an URL (e.g. /castor/... or root://host/...) and if the fname is not an absolute path name or an URL then the path of the tree file is prepended to fname to make the branch file relative to the tree file. In this case one can move the tree + all branch files to a different location in the file system and still access the branch files. The ROOT file will be connected only when necessary. If called by TBranch::Fill (via TBasket::WriteFile), the file will be created with the option "recreate". If called by TBranch::GetEntry (via TBranch::GetBasket), the file will be opened in read mode. To open a file in "update" mode or with a certain compression level, use TBranch::SetFile(TFile *file).

Definition at line 2374 of file TBranch.cxx.

◆ SetFirstEntry()

void TBranch::SetFirstEntry ( Long64_t entry )

virtual

set the first entry number (case of TBranchSTL)

Definition at line 2737 of file TBranch.cxx.

◆ SetMakeClass()

Bool_t TBranch::SetMakeClass ( Bool_t decomposeObj = kTRUE )

virtual

Set the branch in a mode where the object are decomposed (Also known as MakeClass mode).

Return whether the setting was possible (it is not possible for TBranch and TBranchObject).

Reimplemented in TBranchElement.

Definition at line 2393 of file TBranch.cxx.

◆ SetObject()

void TBranch::SetObject ( void * objadd )

virtual

Set object this branch is pointing to.

Reimplemented in TBranchElement.

Definition at line 2402 of file TBranch.cxx.

◆ SetOffset()

virtual void TBranch::SetOffset ( Int_t offset = 0 )

inlinevirtual

Reimplemented in TBranchElement.

Definition at line 219 of file TBranch.h.

◆ SetSkipZip()

void TBranch::SetSkipZip ( Bool_t skip = kTRUE )

inlineprotected

Definition at line 117 of file TBranch.h.

◆ SetStatus()

void TBranch::SetStatus ( Bool_t status = 1 )

virtual

Set branch status to Process or DoNotProcess.

Definition at line 2413 of file TBranch.cxx.

◆ SetTree()

virtual void TBranch::SetTree ( TTree * tree )

inlinevirtual

Reimplemented in TBranchClones.

Definition at line 221 of file TBranch.h.

◆ SetupAddresses()

void TBranch::SetupAddresses ( )

virtual

If the branch address is not set, we set all addresses starting with the top level parent branch.

Reimplemented in TBranchElement, and TBranchObject.

Definition at line 2752 of file TBranch.cxx.

◆ UpdateAddress()

virtual void TBranch::UpdateAddress ( )

inlinevirtual

Reimplemented in TBranchObject.

Definition at line 223 of file TBranch.h.

◆ UpdateFile()

void TBranch::UpdateFile ( )

virtual

Refresh the value of fDirectory (i.e.

where this branch writes/reads its buffers) with the current value of fTree->GetCurrentFile unless this branch has been redirected to a different file. Also update the sub-branches.

Reimplemented in TBranchElement, and TBranchClones.

Definition at line 2762 of file TBranch.cxx.

◆ WriteBasket()

Int_t TBranch::WriteBasket	(	TBasket *	basket,
		Int_t	where
	)

inlineprotected

Definition at line 121 of file TBranch.h.

◆ WriteBasketImpl()

Int_t TBranch::WriteBasketImpl	(	TBasket *	basket,
		Int_t	where,
		ROOT::Internal::TBranchIMTHelper *	imtHelper
	)

private

Write the current basket to disk and return the number of bytes written to the file.

Definition at line 2665 of file TBranch.cxx.

Friends And Related Function Documentation

◆ TTree

friend class TTree

friend

Definition at line 61 of file TBranch.h.

◆ TTreeCloner

friend class TTreeCloner

friend

Definition at line 60 of file TBranch.h.

Member Data Documentation

◆ fAddress

char* TBranch::fAddress

protected

! Address of 1st leaf (variable or object)

Definition at line 98 of file TBranch.h.

◆ fBasketBytes

Int_t* TBranch::fBasketBytes

protected

[fMaxBaskets] Length of baskets on file

Definition at line 92 of file TBranch.h.

◆ fBasketEntry

Long64_t* TBranch::fBasketEntry

protected

[fMaxBaskets] Table of first entry in each basket

Definition at line 93 of file TBranch.h.

◆ fBaskets

TObjArray TBranch::fBaskets

protected

-> List of baskets of this branch

Definition at line 91 of file TBranch.h.

◆ fBasketSeek

Long64_t* TBranch::fBasketSeek

protected

[fMaxBaskets] Addresses of baskets on file

Definition at line 94 of file TBranch.h.

◆ fBasketSize

Int_t TBranch::fBasketSize

protected

Initial Size of Basket Buffer.

Definition at line 71 of file TBranch.h.

◆ fBranches

TObjArray TBranch::fBranches

protected

-> List of Branches of this branch

Definition at line 89 of file TBranch.h.

◆ fBrowsables

TList* TBranch::fBrowsables

protected

! List of TVirtualBranchBrowsables used for Browse()

Definition at line 103 of file TBranch.h.

◆ fCompress

Int_t TBranch::fCompress

protected

Compression level and algorithm.

Definition at line 70 of file TBranch.h.

◆ fCurrentBasket

TBasket* TBranch::fCurrentBasket

protected

! Pointer to the current basket.

Definition at line 84 of file TBranch.h.

◆ fDirectory

TDirectory* TBranch::fDirectory

protected

! Pointer to directory where this branch buffers are stored

Definition at line 99 of file TBranch.h.

◆ fEntries

Long64_t TBranch::fEntries

protected

Number of entries.

Definition at line 85 of file TBranch.h.

◆ fEntryBuffer

TBuffer* TBranch::fEntryBuffer

protected

! Buffer used to directly pass the content without streaming

Definition at line 101 of file TBranch.h.

◆ fEntryNumber

Long64_t TBranch::fEntryNumber

protected

Current entry number (last one filled in this branch)

Definition at line 74 of file TBranch.h.

◆ fEntryOffsetLen

Int_t TBranch::fEntryOffsetLen

protected

Initial Length of fEntryOffset table in the basket buffers.

Definition at line 72 of file TBranch.h.

◆ fFileName

TString TBranch::fFileName

protected

Name of file where buffers are stored ("" if in same file as Tree header)

Definition at line 100 of file TBranch.h.

◆ fFillLeaves

FillLeaves_t TBranch::fFillLeaves

protected

! Pointer to the FillLeaves implementation to use.

Definition at line 110 of file TBranch.h.

◆ fFirstBasketEntry

Long64_t TBranch::fFirstBasketEntry

protected

! First entry in the current basket.

Definition at line 82 of file TBranch.h.

◆ fFirstEntry

Long64_t TBranch::fFirstEntry

protected

Number of the first entry in this branch.

Definition at line 86 of file TBranch.h.

◆ fgCount

Int_t TBranch::fgCount = 0

staticprotected

! branch counter

Definition at line 69 of file TBranch.h.

◆ fLeaves

TObjArray TBranch::fLeaves

protected

-> List of leaves of this branch

Definition at line 90 of file TBranch.h.

◆ fMaxBaskets

Int_t TBranch::fMaxBaskets

protected

Maximum number of Baskets so far.

Definition at line 76 of file TBranch.h.

◆ fMother

TBranch* TBranch::fMother

protected

! Pointer to top-level parent branch in the tree.

Definition at line 96 of file TBranch.h.

◆ fNBaskets

Int_t TBranch::fNBaskets

protected

! Number of baskets in memory

Definition at line 77 of file TBranch.h.

◆ fNextBasketEntry

Long64_t TBranch::fNextBasketEntry

protected

! Next entry that will requires us to go to the next basket

Definition at line 83 of file TBranch.h.

◆ fNleaves

Int_t TBranch::fNleaves

protected

! Number of leaves

Definition at line 79 of file TBranch.h.

◆ fOffset

Int_t TBranch::fOffset

protected

Offset of this branch.

Definition at line 75 of file TBranch.h.

◆ fParent

TBranch* TBranch::fParent

protected

! Pointer to parent branch.

Definition at line 97 of file TBranch.h.

◆ fReadBasket

Int_t TBranch::fReadBasket

protected

! Current basket number when reading

Definition at line 80 of file TBranch.h.

◆ fReadEntry

Long64_t TBranch::fReadEntry

protected

! Current entry number when reading

Definition at line 81 of file TBranch.h.

◆ fReadLeaves

ReadLeaves_t TBranch::fReadLeaves

protected

! Pointer to the ReadLeaves implementation to use.

Definition at line 108 of file TBranch.h.

◆ fSkipZip

Bool_t TBranch::fSkipZip

protected

! After being read, the buffer will not be unzipped.

Definition at line 105 of file TBranch.h.

◆ fSplitLevel

Int_t TBranch::fSplitLevel

protected

Branch split level.

Definition at line 78 of file TBranch.h.

◆ fTotBytes

Long64_t TBranch::fTotBytes

protected

Total number of bytes in all leaves before compression.

Definition at line 87 of file TBranch.h.

◆ fTransientBuffer

TBuffer* TBranch::fTransientBuffer

protected

! Pointer to the current transient buffer.

Definition at line 102 of file TBranch.h.

◆ fTree

TTree* TBranch::fTree

protected

! Pointer to Tree header

Definition at line 95 of file TBranch.h.

◆ fWriteBasket

Int_t TBranch::fWriteBasket

protected

Last basket number written.

Definition at line 73 of file TBranch.h.

◆ fZipBytes

Long64_t TBranch::fZipBytes

protected

Total number of bytes in all leaves after compression.

Definition at line 88 of file TBranch.h.

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

tree/tree/inc/TBranch.h
tree/tree/src/TBranch.cxx

Public Member Functions

Static Public Member Functions

Protected Types

Protected Member Functions

Protected Attributes

Static Protected Attributes

Private Member Functions

Friends

Additional Inherited Members

Member Typedef Documentation

◆ FillLeaves_t

◆ ReadLeaves_t

Member Enumeration Documentation

◆ EStatusBits

Constructor & Destructor Documentation

◆ TBranch() [1/4]

◆ TBranch() [2/4]

◆ TBranch() [3/4]

◆ TBranch() [4/4]

◆ ~TBranch()

Member Function Documentation

◆ AddBasket()

◆ AddLastBasket()

◆ BackFill()

◆ Browse()

◆ DeleteBaskets()

◆ DropBaskets()

◆ ExpandBasketArrays()

◆ Fill()

◆ FillEntryBuffer()

◆ FillImpl()

◆ FillLeavesImpl()

◆ FindBranch()

◆ FindLeaf()

◆ FlushBaskets()

◆ FlushOneBasket()

◆ GetAddress()

◆ GetBasket()

◆ GetBasketBytes()

◆ GetBasketEntry()

◆ GetBasketSeek()

◆ GetBasketSize()

◆ GetBrowsables()

◆ GetClassName()

◆ GetCompressionAlgorithm()

◆ GetCompressionLevel()

◆ GetCompressionSettings()

◆ GetDirectory()

◆ GetEntries()

◆ GetEntry()

◆ GetEntryExport()

◆ GetEntryNumber()

◆ GetEntryOffsetLen()

◆ GetEvent()

◆ GetExpectedType()

◆ GetFile()

◆ GetFileName()

◆ GetFirstEntry()

◆ GetFreshBasket()

◆ GetIconName()

◆ GetLeaf()

◆ GetListOfBaskets()

◆ GetListOfBranches()

◆ GetListOfLeaves()

◆ GetMakeClass()

◆ GetMaxBaskets()

◆ GetMother()

◆ GetNleaves()

◆ GetOffset()

◆ GetReadBasket()

◆ GetReadEntry()

◆ GetRealFileName()

◆ GetRow()

◆ GetSplitLevel()

◆ GetSubBranch()

◆ GetTotalSize()

◆ GetTotBytes()

◆ GetTransientBuffer()

◆ GetTree()

◆ GetWriteBasket()