Describe directory structure in memory.

Python interface

It is possible to retrieve the content of a TDirectory object just like getting items from a Python dictionary. Moreover, once a subdirectory or object is accessed for the first time, it is cached for later use. For example, assuming d is a TDirectory instance:

# Access a subdirectory
d["subdir"]
 
# We can go further down in the hierarchy of directories
d["subdir"]["subsubdir"]
 
# Access an object (e.g. a histogram) in the directory
d["obj"]
 
# ... or in a subdirectory
d["subdir"]["obj"]
 
# Wrong key: raises KeyError
d["wrongAttr"]

Furthermore, TDirectory implements a WriteObject Python method which relies on TDirectory::WriteObjectAny. This method is a no-op for TDirectory objects, but it is useful for objects of TDirectory subclasses such as TDirectoryFile and TFile, which inherit it. Please refer to the documentation of those classes for more information.

Definition at line 45 of file TDirectory.h.

Classes
class	TContext
	TDirectory::TContext keeps track and restore the current directory. More...

Public Member Functions
	TDirectory ()
	Directory default constructor.

	TDirectory (const char name, const char title, Option_t option="", TDirectory motherDir=nullptr)
	Create a new Directory.

virtual	~TDirectory ()
	Destructor.

virtual void	Add (TObject *obj, Bool_t replace=kFALSE)

virtual void	Append (TObject *obj, Bool_t replace=kFALSE)
	Append object to this directory.

virtual Int_t	AppendKey (TKey *)

void	Browse (TBrowser *b) override
	Browse the content of the directory.

virtual void	Build (TFile motherFile=nullptr, TDirectory motherDir=nullptr)

virtual Bool_t	cd ()
	Change current directory to "this" directory.

virtual Bool_t	cd (const char *path)
	Change current directory to "this" directory or to the directory described by the path if given one.

void	Clear (Option_t *option="") override
	Delete all objects from a Directory list.

virtual TObject *	CloneObject (const TObject *obj, Bool_t autoadd=kTRUE)
	Clone an object.

virtual void	Close (Option_t *option="")
	Delete all objects from memory and directory structure itself.

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

void	Delete (const char *namecycle="") override
	Delete Objects or/and keys in a directory.

virtual void	DeleteAll (Option_t *option="")
	Delete all objects from memory.

void	Draw (Option_t *option="") override
	Fill Graphics Structure and Paint.

virtual TKey *	FindKey (const char *) const

virtual TKey *	FindKeyAny (const char *) const

TObject *	FindObject (const char *name) const override
	Find object by name in the list of memory objects.

TObject *	FindObject (const TObject *obj) const override
	Find object in the list of memory objects.

virtual TObject *	FindObjectAny (const char *name) const
	Find object by name in the list of memory objects of the current directory or its sub-directories.

virtual TObject *	FindObjectAnyFile (const char *) const

virtual TObject *	Get (const char *namecycle)
	Return pointer to object identified by namecycle.

template<class T >
T *	Get (const char *namecycle)
	See documentation of TDirectoryFile::Get(const char *namecycle)

virtual Int_t	GetBufferSize () const

virtual TDirectory *	GetDirectory (const char namecycle, Bool_t printError=false, const char funcname="GetDirectory")
	Find a directory using apath.

virtual TFile *	GetFile () const

virtual TKey *	GetKey (const char *, Short_t=9999) const

virtual TList *	GetList () const

virtual TList *	GetListOfKeys () const

TObject *	GetMother () const

TDirectory *	GetMotherDir () const

virtual Int_t	GetNbytesKeys () const

virtual Int_t	GetNkeys () const

template<class T >
void	GetObject (const char namecycle, T &ptr)
	Get an object with proper type checking.

virtual void *	GetObjectChecked (const char namecycle, const char classname)
	See documentation of TDirectory::GetObjectCheck(const char namecycle, const TClass cl)

virtual void *	GetObjectChecked (const char namecycle, const TClass cl)
	Return pointer to object identified by namecycle if and only if the actual object is a type suitable to be stored as a pointer to a "expectedClass" If expectedClass is null, no check is performed.

virtual void *	GetObjectUnchecked (const char *namecycle)
	Return pointer to object identified by namecycle.

virtual const char *	GetPath () const
	Returns the full path of the directory.

virtual const char *	GetPathStatic () const
	Returns the full path of the directory.

virtual Long64_t	GetSeekDir () const

virtual Long64_t	GetSeekKeys () const

virtual Long64_t	GetSeekParent () const

TUUID	GetUUID () const

TClass *	IsA () const override

Bool_t	IsBuilt () const

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

virtual Bool_t	IsModified () const

virtual Bool_t	IsWritable () const

void	ls (Option_t *option="") const override
	List Directory contents.

virtual TDirectory *	mkdir (const char name, const char title="", Bool_t returnExistingDirectory=kFALSE)
	Create a sub-directory "a" or a hierarchy of sub-directories "a/b/c/...".

virtual TFile *	OpenFile (const char , Option_t ="", const char *="", Int_t=1, Int_t=0)

void	Paint (Option_t *option="") override
	Paint all objects in the directory.

void	Print (Option_t *option="") const override
	Print all objects in the directory.

virtual void	Purge (Short_t=1)

virtual void	pwd () const
	Print the path of the directory.

virtual void	ReadAll (Option_t *="")

virtual Int_t	ReadKeys (Bool_t=kTRUE)

virtual Int_t	ReadTObject (TObject , const char )

void	RecursiveRemove (TObject *obj) override
	Recursively remove object from a Directory.

virtual TObject *	Remove (TObject *)
	Remove an object from the in-memory list.

virtual void	rmdir (const char *name)
	Removes subdirectory from the directory When directory is deleted, all keys in all subdirectories will be read first and deleted from file (if exists) Equivalent call is Delete("name;*");.

virtual void	Save ()

virtual Int_t	SaveObjectAs (const TObject , const char ="", Option_t *="") const
	Save object in filename, if filename is `nullptr` or "", a file with "<objectname>.root" is created.

virtual void	SaveSelf (Bool_t=kFALSE)

virtual void	SetBufferSize (Int_t)

virtual void	SetModified ()

virtual void	SetMother (TObject *mother)

void	SetName (const char *newname) override
	Set the name for directory If the directory name is changed after the directory was written once, ROOT currently would NOT change the name of correspondent key in the mother directory.

virtual void	SetSeekDir (Long64_t)

virtual void	SetTRefAction (TObject , TObject )

virtual void	SetWritable (Bool_t)

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

void	Streamer (TBuffer &) override
	TDirectory Streamer.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

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

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

virtual void	WriteDirHeader ()

virtual void	WriteKeys ()

template<typename T >
std::enable_if_t<!std::is_base_of< TObject, T >::value, Int_t >	WriteObject (const T obj, const char name, Option_t *option="", Int_t bufsize=0)
	Write an object with proper type checking.

template<typename T >
std::enable_if_t< std::is_base_of< TObject, T >::value, Int_t >	WriteObject (const T obj, const char name, Option_t *option="", Int_t bufsize=0)
	Write an object with proper type checking.

virtual Int_t	WriteObjectAny (const void , const char , const char , Option_t ="", Int_t=0)

virtual Int_t	WriteObjectAny (const void , const TClass , const char , Option_t ="", Int_t=0)

virtual Int_t	WriteTObject (const TObject obj, const char name=nullptr, Option_t *="", Int_t=0)
	Write an object with proper type checking.

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.

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.

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 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	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 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).

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	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 void	AddDirectory (Bool_t add=kTRUE)
	Sets the flag controlling the automatic add objects like histograms, TGraph2D, etc in memory.

static Bool_t	AddDirectoryStatus ()
	Static function: see TDirectory::AddDirectory for more comments.

static Bool_t	Cd (const char *path)
	Change current directory to "path".

static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static std::atomic< TDirectory * > &	CurrentDirectory ()
	Return the current directory for the current thread.

static const char *	DeclFileName ()

static void	DecodeNameCycle (const char namecycle, char name, Short_t &cycle, const size_t namesize=0)
	Decode a namecycle "aap;2" into name "aap" and cycle "2".

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 Types
using	SharedGDirectory_t = std::shared_ptr< std::atomic< TDirectory * > >
	Pointer to a list of TContext object pointing to this TDirectory.

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

Protected Member Functions
	TDirectory (const TDirectory &directory)=delete

void	BuildDirectory (TFile motherFile, TDirectory motherDir)
	Initialise directory to defaults.

Bool_t	cd1 (const char *path)
	flag to add histograms, graphs,etc to the directory

void	CleanTargets ()
	Clean the pointers to this object (gDirectory, TContext, etc.).

void	FillFullPath (TString &buf) const
	Recursive method to fill full path for directory.

void	operator= (const TDirectory &)=delete

void	RegisterContext (TContext *ctxt)
	Register a TContext pointing to this TDirectory object.

void	RegisterGDirectory (SharedGDirectory_t &ptr)
	Register a std::atomic<TDirectory*> that will soon be pointing to this TDirectory object.

void	UnregisterContext (TContext *ctxt)
	UnRegister a TContext pointing to this TDirectory object.

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 ()

Static Protected Member Functions
static Bool_t	Cd1 (const char *path)
	Change current directory to "path".

static SharedGDirectory_t &	GetSharedLocalCurrentDirectory ()
	Return the (address of) a shared pointer to the struct holding the actual thread local gDirectory pointer and the atomic_flag for its lock.

Protected Attributes
TContext *	fContext {nullptr}
	Buffer for GetPath() function.

std::atomic< size_t >	fContextPeg {0}
	thread local gDirectory pointing to this object.

std::vector< SharedGDirectory_t >	fGDirectories

TList *	fList {nullptr}

TObject *	fMother {nullptr}

TString	fPathBuffer

std::atomic_flag	fSpinLock
	Counter delaying the TDirectory destructor from finishing.

TUUID	fUUID

Protected Attributes inherited from TNamed
TString	fName

TString	fTitle

Static Protected Attributes
static Bool_t	fgAddDirectory = kTRUE
	MSVC doesn't support = ATOMIC_FLAG_INIT;.

Friends
struct	ROOT::Internal::TDirectoryAtomicAdapter

class	TContext

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 )) }

#include <TDirectory.h>

Inheritance diagram for TDirectory:

[legend]

Member Typedef Documentation

◆ SharedGDirectory_t

using TDirectory::SharedGDirectory_t = std::shared_ptr<std::atomic<TDirectory *> >

protected

Pointer to a list of TContext object pointing to this TDirectory.

Definition at line 147 of file TDirectory.h.

Constructor & Destructor Documentation

◆ TDirectory() [1/3]

TDirectory::TDirectory ( const TDirectory & directory )

protecteddelete

◆ TDirectory() [2/3]

TDirectory::TDirectory ( )

Directory default constructor.

Definition at line 53 of file TDirectory.cxx.

◆ TDirectory() [3/3]

TDirectory::TDirectory	(	const char *	name,
		const char *	title,
		Option_t *	option = `""`,
		TDirectory *	initMotherDir = `nullptr`
	)

Create a new Directory.

A new directory with name,title is created in the current directory The directory header information is immediately saved in the file A new key is added in the parent directory

When this constructor is called from a class directly derived from TDirectory, the third argument classname MUST be specified. In this case, classname must be the name of the derived class.

Note that the directory name cannot contain slashes.

Definition at line 72 of file TDirectory.cxx.

◆ ~TDirectory()

TDirectory::~TDirectory ( )

virtual

Destructor.

Definition at line 97 of file TDirectory.cxx.

Member Function Documentation

◆ Add()

virtual void TDirectory::Add	(	TObject *	obj,
		Bool_t	replace = `kFALSE`
	)

inlinevirtual

Reimplemented in RooWorkspace::WSDir, and TDirectoryFile.

Definition at line 183 of file TDirectory.h.

◆ AddDirectory()

void TDirectory::AddDirectory ( Bool_t add = kTRUE )

static

Sets the flag controlling the automatic add objects like histograms, TGraph2D, etc in memory.

By default (fAddDirectory = kTRUE), these objects are automatically added to the list of objects in memory. Note that in the classes like TH1, TGraph2D supporting this facility, one object can be removed from its support directory by calling object->SetDirectory(nullptr) or object->SetDirectory(dir) to add it to the list of objects in the directory dir.

NOTE that this is a static function. To call it, use:

TDirectory::AddDirectory

static void AddDirectory(Bool_t add=kTRUE)

Sets the flag controlling the automatic add objects like histograms, TGraph2D, etc in memory.

Definition TDirectory.cxx:180

Definition at line 180 of file TDirectory.cxx.

◆ AddDirectoryStatus()

Bool_t TDirectory::AddDirectoryStatus ( )

static

Static function: see TDirectory::AddDirectory for more comments.

Definition at line 188 of file TDirectory.cxx.

◆ Append()

void TDirectory::Append	(	TObject *	obj,
		Bool_t	replace = `kFALSE`
	)

virtual

Append object to this directory.

If replace is true: remove any existing objects with the same name (if the name is not "")

Reimplemented in RooWorkspace::WSDir, TROOT, and TDirectoryFile.

Definition at line 199 of file TDirectory.cxx.

◆ AppendKey()

virtual Int_t TDirectory::AppendKey ( TKey * )

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 184 of file TDirectory.h.

◆ Browse()

void TDirectory::Browse ( TBrowser * b )

overridevirtual

Browse the content of the directory.

Reimplemented from TObject.

Reimplemented in TROOT, and TDirectoryFile.

Definition at line 227 of file TDirectory.cxx.

◆ Build()

virtual void TDirectory::Build	(	TFile *	motherFile = `nullptr`,
		TDirectory *	motherDir = `nullptr`
	)

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 186 of file TDirectory.h.

◆ BuildDirectory()

void TDirectory::BuildDirectory	(	TFile *	motherFile,
		TDirectory *	motherDir
	)

protected

Initialise directory to defaults.

If directory is created via default ctor (when dir is read from file) don't add it here to the directory since its name is not yet known. It will be added to the directory in TKey::ReadObj().

Definition at line 249 of file TDirectory.cxx.

◆ cd() [1/2]

Bool_t TDirectory::cd ( )

virtual

Change current directory to "this" directory.

Returns kTRUE (it's guaranteed to succeed).

Reimplemented in TDirectoryFile.

Definition at line 538 of file TDirectory.cxx.

◆ cd() [2/2]

Bool_t TDirectory::cd ( const char * path )

virtual

Change current directory to "this" directory or to the directory described by the path if given one.

Using path one can change the current directory to "path". The absolute path syntax is: file.root:/dir1/dir2 where file.root is the file and /dir1/dir2 the desired subdirectory in the file.

Relative syntax is relative to "this" directory. E.g: ../aa.

Returns kTRUE in case of success.

Reimplemented in TDirectoryFile.

Definition at line 562 of file TDirectory.cxx.

◆ Cd()

Bool_t TDirectory::Cd ( const char * path )

static

Change current directory to "path".

The absolute path syntax is: file.root:/dir1/dir2 where file.root is the file and /dir1/dir2 the desired subdirectory in the file. Relative syntax is relative to the current directorygDirectory, e.g.:../aa`.

Returns kTRUE in case of success.

Definition at line 603 of file TDirectory.cxx.

◆ cd1()

Bool_t TDirectory::cd1 ( const char * apath )

protected

flag to add histograms, graphs,etc to the directory

Change current directory to "this" directory or to the directory described by the path if given one.

Using path one can change the current directory to "path". The absolute path syntax is: file.root:/dir1/dir2 where file.root is the file and /dir1/dir2 the desired subdirectory in the file.

Relative syntax is relative to "this" directory. E.g: ../aa.

Returns kFALSE in case path does not exist.

Definition at line 581 of file TDirectory.cxx.

◆ Cd1()

Bool_t TDirectory::Cd1 ( const char * apath )

staticprotected

Change current directory to "path".

The path syntax is: file.root:/dir1/dir2 where file.root is the file and /dir1/dir2 the desired subdirectory in the file. Relative syntax is relative to the current directory gDirectory, e.g.: ../aa.

Returns kFALSE in case path does not exist.

Definition at line 617 of file TDirectory.cxx.

◆ Class()

static TClass * TDirectory::Class ( )

static

Returns: TClass describing this class

◆ Class_Name()

static const char * TDirectory::Class_Name ( )

static

Returns: Name of this class

◆ Class_Version()

static constexpr Version_t TDirectory::Class_Version ( )

inlinestaticconstexpr

Returns: Version of this class

Definition at line 308 of file TDirectory.h.

◆ CleanTargets()

void TDirectory::CleanTargets ( )

protected

Clean the pointers to this object (gDirectory, TContext, etc.).

Definition at line 264 of file TDirectory.cxx.

◆ Clear()

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

overridevirtual

Delete all objects from a Directory list.

Reimplemented from TObject.

Definition at line 634 of file TDirectory.cxx.

◆ CloneObject()

TObject * TDirectory::CloneObject	(	const TObject *	obj,
		Bool_t	autoadd = `kTRUE`
	)

virtual

Clone an object.

This function is called when the directory is not a TDirectoryFile. This version has to load the I/O package, hence via Cling.

If autoadd is true and if the object class has a DirectoryAutoAdd function, it will be called at the end of the function with the parameter gDirector. This usually means that the object will be appended to the current ROOT directory.

Reimplemented in TDirectoryFile.

Definition at line 364 of file TDirectory.cxx.

◆ Close()

void TDirectory::Close ( Option_t * option = "" )

virtual

Delete all objects from memory and directory structure itself.

if option is "slow", iterate through the containers in a way to can handle 'external' modification (induced by recursions) if option is "nodelete", write the TDirectory but do not delete the contained objects.

Reimplemented in TSQLFile, TXMLFile, TDirectoryFile, TFile, TNetFile, TParallelMergingFile, and TWebFile.

Definition at line 645 of file TDirectory.cxx.

◆ Copy()

void TDirectory::Copy ( TObject & object ) const

inlineoverridevirtual

Copy this to obj.

Reimplemented from TObject.

Reimplemented in TDirectoryFile, and TFile.

Definition at line 191 of file TDirectory.h.

◆ CurrentDirectory()

std::atomic< TDirectory * > & TDirectory::CurrentDirectory ( )

static

Return the current directory for the current thread.

Definition at line 432 of file TDirectory.cxx.

◆ DeclFileName()

static const char * TDirectory::DeclFileName ( )

inlinestatic

Returns: Name of the file containing the class declaration

Definition at line 308 of file TDirectory.h.

◆ DecodeNameCycle()

void TDirectory::DecodeNameCycle	(	const char *	buffer,
		char *	name,
		Short_t &	cycle,
		const size_t	namesize = `0`
	)

static

Decode a namecycle "aap;2" into name "aap" and cycle "2".

Destination buffer size for name (including string terminator) should be specified in namesize.

Note

Edge cases:

If the number after the ; is larger than SHORT_MAX, cycle is set to 0.
If name ends with ;*, cycle is set to 10000.
In all other cases, i.e. when number is not a digit or buffer is a nullptr, cycle is set to9999`.

Definition at line 1301 of file TDirectory.cxx.

◆ Delete()

void TDirectory::Delete ( const char * namecycle = "" )

overridevirtual

Delete Objects or/and keys in a directory.

namecycle has the format name;cycle
namecycle = "" same as namecycle ="T*"
name = * means all
cycle = * means all cycles (memory and keys)
cycle = "" or cycle = 9999 ==> apply to a memory object When name=* use T* to delete subdirectories also

To delete one directory, you must specify the directory cycle, eg. file.Delete("dir1;1");

examples:

foo : delete object named foo in memory
foo* : delete all objects with a name starting with foo
foo;1 : delete cycle 1 of foo on file
foo;* : delete all cycles of foo on file and also from memory
*;2 : delete all objects on file having the cycle 2
*;* : delete all objects from memory and file
T*;* : delete all objects from memory and file and all subdirectories

Reimplemented from TObject.

Reimplemented in TDirectoryFile, and TFile.

Definition at line 712 of file TDirectory.cxx.

◆ DeleteAll()

void TDirectory::DeleteAll ( Option_t * option = "" )

virtual

Delete all objects from memory.

Definition at line 685 of file TDirectory.cxx.

◆ Draw()

void TDirectory::Draw ( Option_t * option = "" )

overridevirtual

Fill Graphics Structure and Paint.

Loop on all objects (memory or file) and all subdirectories

Reimplemented from TObject.

Reimplemented in TFile.

Definition at line 768 of file TDirectory.cxx.

◆ FillFullPath()

void TDirectory::FillFullPath ( TString & buf ) const

protected

Recursive method to fill full path for directory.

Definition at line 1061 of file TDirectory.cxx.

◆ FindKey()

virtual TKey * TDirectory::FindKey ( const char * ) const

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 197 of file TDirectory.h.

◆ FindKeyAny()

virtual TKey * TDirectory::FindKeyAny ( const char * ) const

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 198 of file TDirectory.h.

◆ FindObject() [1/2]

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

overridevirtual

Find object by name in the list of memory objects.

Reimplemented from TObject.

Reimplemented in TROOT.

Definition at line 784 of file TDirectory.cxx.

◆ FindObject() [2/2]

TObject * TDirectory::FindObject ( const TObject * obj ) const

overridevirtual

Find object in the list of memory objects.

Reimplemented from TObject.

Reimplemented in TROOT.

Definition at line 776 of file TDirectory.cxx.

◆ FindObjectAny()

TObject * TDirectory::FindObjectAny ( const char * aname ) const

virtual

Find object by name in the list of memory objects of the current directory or its sub-directories.

After this call the current directory is not changed. To automatically set the current directory where the object is found, use FindKeyAny(aname)->ReadObj().

Reimplemented in TROOT, and TDirectoryFile.

Definition at line 796 of file TDirectory.cxx.

◆ FindObjectAnyFile()

virtual TObject * TDirectory::FindObjectAnyFile ( const char * ) const

inlinevirtual

Reimplemented in TROOT, and TDirectoryFile.

Definition at line 202 of file TDirectory.h.

◆ Get() [1/2]

TObject * TDirectory::Get ( const char * namecycle )

virtual

Return pointer to object identified by namecycle.

namecycle has the format name;cycle

name = * is illegal, cycle = * is illegal
cycle = "" or cycle = 9999 ==> apply to a memory object

examples:

foo : get object named foo in memory if object is not in memory, try with highest cycle from file
foo;1 : get cycle 1 of foo on file

The retrieved object should in principle derive from TObject. If not, the function TDirectory::GetObject should be called. However, this function will still work for a non-TObject, providing that the calling application cast the return type to the correct type (which is the actual type of the object).

NOTE:

The method GetObject offer better protection and avoid the need for any cast:

MyClass *obj;
directory->GetObject("some object",obj);
if (obj) { ... the object exist and inherits from MyClass ... }

VERY IMPORTANT NOTE:

In case the class of this object derives from TObject but not as a first inheritance, one must use dynamic_cast<>().

Example 1: Normal case:

class MyClass : public TObject, public AnotherClass

TObject

Mother of all ROOT objects.

Definition TObject.h:41

then on return, one can do:

MyClass *obj = (MyClass*)directory->Get("some object of MyClass");

Example 2: Special case:

class MyClass : public AnotherClass, public TObject

then on return, one must do:

MyClass *obj = dynamic_cast<MyClass*>(directory->Get("some object of MyClass"));

Of course, dynamic_cast<> can also be used in the example 1.

Reimplemented in TDirectoryFile, and TDirectoryFile.

Definition at line 866 of file TDirectory.cxx.

◆ Get() [2/2]

template<class T >

T * TDirectory::Get ( const char * namecycle )

inline

See documentation of TDirectoryFile::Get(const char *namecycle)

Definition at line 205 of file TDirectory.h.

◆ GetBufferSize()

virtual Int_t TDirectory::GetBufferSize ( ) const

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 219 of file TDirectory.h.

◆ GetDirectory()

TDirectory * TDirectory::GetDirectory	(	const char *	apath,
		Bool_t	printError = `false`,
		const char *	funcname = `"GetDirectory"`
	)

virtual

Find a directory using apath.

It apath is null or empty, returns "this" directory. Otherwise use apath to find a directory. The absolute path syntax is: file.root:/dir1/dir2

where file.root is the file and /dir1/dir2 the desired subdirectory in the file. Relative syntax is relative to "this" directory. E.g: ../aa. Returns 0 in case path does not exist. If printError is true, use Error with 'funcname' to issue an error message.

Reimplemented in TDirectoryFile.

Definition at line 448 of file TDirectory.cxx.

◆ GetFile()

virtual TFile * TDirectory::GetFile ( ) const

inlinevirtual

Reimplemented in TROOT, and TDirectoryFile.

Definition at line 220 of file TDirectory.h.

◆ GetKey()

virtual TKey * TDirectory::GetKey	(	const char *	,
		Short_t	= `9999`
	)		const

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 221 of file TDirectory.h.

◆ GetList()

virtual TList * TDirectory::GetList ( ) const

inlinevirtual

Definition at line 222 of file TDirectory.h.

◆ GetListOfKeys()

virtual TList * TDirectory::GetListOfKeys ( ) const

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 223 of file TDirectory.h.

◆ GetMother()

TObject * TDirectory::GetMother ( ) const

inline

Definition at line 224 of file TDirectory.h.

◆ GetMotherDir()

TDirectory * TDirectory::GetMotherDir ( ) const

inline

Definition at line 225 of file TDirectory.h.

◆ GetNbytesKeys()

virtual Int_t TDirectory::GetNbytesKeys ( ) const

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 226 of file TDirectory.h.

◆ GetNkeys()

virtual Int_t TDirectory::GetNkeys ( ) const

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 227 of file TDirectory.h.

◆ GetObject()

template<class T >

void TDirectory::GetObject	(	const char *	namecycle,
		T *&	ptr
	)

inline

Get an object with proper type checking.

If the object doesn't exist in the file or if the type doesn't match, a nullptr is returned. Also see TDirectory::Get().

Definition at line 212 of file TDirectory.h.

◆ GetObjectChecked() [1/2]

void * TDirectory::GetObjectChecked	(	const char *	namecycle,
		const char *	classname
	)

virtual

See documentation of TDirectory::GetObjectCheck(const char *namecycle, const TClass *cl)

Reimplemented in TDirectoryFile.

Definition at line 929 of file TDirectory.cxx.

◆ GetObjectChecked() [2/2]

void * TDirectory::GetObjectChecked	(	const char *	namecycle,
		const TClass *	expectedClass
	)

virtual

Return pointer to object identified by namecycle if and only if the actual object is a type suitable to be stored as a pointer to a "expectedClass" If expectedClass is null, no check is performed.

namecycle has the format name;cycle

name = * is illegal, cycle = * is illegal
cycle = "" or cycle = 9999 ==> apply to a memory object

VERY IMPORTANT NOTE:

The calling application must cast the returned pointer to the type described by the 2 arguments (i.e. cl):

MyClass *obj = (MyClass*)directory->GetObjectChecked("some object of MyClass","MyClass"));

Note: We recommend using the method TDirectory::GetObject:

MyClass *obj = nullptr;
directory->GetObject("some object inheriting from MyClass",obj);
if (obj) { ... we found what we are looking for ... }

Reimplemented in TDirectoryFile.

Definition at line 958 of file TDirectory.cxx.

◆ GetObjectUnchecked()

void * TDirectory::GetObjectUnchecked ( const char * namecycle )

virtual

Return pointer to object identified by namecycle.

The returned object may or may not derive from TObject.

namecycle has the format name;cycle
name = * is illegal, cycle = * is illegal
cycle = "" or cycle = 9999 ==> apply to a memory object

VERY IMPORTANT NOTE:

The calling application must cast the returned object to the final type, e.g.

MyClass *obj = (MyClass*)directory->GetObject("some object of MyClass");

Reimplemented in TDirectoryFile.

Definition at line 921 of file TDirectory.cxx.

◆ GetPath()

const char * TDirectory::GetPath ( ) const

virtual

Returns the full path of the directory.

E.g. file:/dir1/dir2. The returned path will be re-used by the next call to GetPath().

Definition at line 1048 of file TDirectory.cxx.

◆ GetPathStatic()

const char * TDirectory::GetPathStatic ( ) const

virtual

Returns the full path of the directory.

E.g. file:/dir1/dir2. The returned path will be re-used by the next call to GetPath().

Definition at line 1010 of file TDirectory.cxx.

◆ GetSeekDir()

virtual Long64_t TDirectory::GetSeekDir ( ) const

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 228 of file TDirectory.h.

◆ GetSeekKeys()

virtual Long64_t TDirectory::GetSeekKeys ( ) const

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 230 of file TDirectory.h.

◆ GetSeekParent()

virtual Long64_t TDirectory::GetSeekParent ( ) const

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 229 of file TDirectory.h.

◆ GetSharedLocalCurrentDirectory()

TDirectory::SharedGDirectory_t & TDirectory::GetSharedLocalCurrentDirectory ( )

staticprotected

Return the (address of) a shared pointer to the struct holding the actual thread local gDirectory pointer and the atomic_flag for its lock.

Definition at line 416 of file TDirectory.cxx.

◆ GetUUID()

TUUID TDirectory::GetUUID ( ) const

inline

Definition at line 233 of file TDirectory.h.

◆ IsA()

TClass * TDirectory::IsA ( ) const

inlineoverridevirtual

Returns: TClass describing current object

Reimplemented from TObject.

Reimplemented in TROOT, TDirectoryFile, TFile, TMemFile, TSQLFile, TXMLFile, TNetFile, TParallelMergingFile, TS3WebFile, TWebFile, TNetXNGFile, and RooWorkspace::WSDir.

Definition at line 308 of file TDirectory.h.

◆ IsBuilt()

Bool_t TDirectory::IsBuilt ( ) const

inline

Definition at line 234 of file TDirectory.h.

◆ IsFolder()

Bool_t TDirectory::IsFolder ( ) const

inlineoverridevirtual

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

Reimplemented from TObject.

Reimplemented in TROOT.

Definition at line 235 of file TDirectory.h.

◆ IsModified()

virtual Bool_t TDirectory::IsModified ( ) const

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 236 of file TDirectory.h.

◆ IsWritable()

virtual Bool_t TDirectory::IsWritable ( ) const

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 237 of file TDirectory.h.

◆ ls()

void TDirectory::ls ( Option_t * option = "" ) const

overridevirtual

List Directory contents.

Indentation is used to identify the directory tree Subdirectories are listed first, then objects in memory.

The option can has the following format:

 [<regexp>]

The <regexp> will be used to match the name of the objects. By default memory and disk objects are listed.

Reimplemented from TObject.

Reimplemented in TROOT, TDirectoryFile, and TFile.

Definition at line 1143 of file TDirectory.cxx.

◆ mkdir()

TDirectory * TDirectory::mkdir	(	const char *	name,
		const char *	title = `""`,
		Bool_t	returnExistingDirectory = `kFALSE`
	)

virtual

Create a sub-directory "a" or a hierarchy of sub-directories "a/b/c/...".

Returns 0 in case of error or if a sub-directory (hierarchy) with the requested name already exists. returnExistingDirectory returns a pointer to an already existing sub-directory with the same name. Returns a pointer to the created sub-directory or to the top sub-directory of the hierarchy (in the above example, the returned TDirectory * always points to "a"). In particular, the steps to create first a/b/c and then a/b/d without receiving errors are:

TFile * file = new TFile("afile","RECREATE");
file->mkdir("a");
file->cd("a");
gDirectory->mkdir("b/c");
gDirectory->cd("b");
gDirectory->mkdir("d");

or

TFile * file = new TFile("afile","RECREATE");
file->mkdir("a");
file->cd("a");
gDirectory->mkdir("b/c");
gDirectory->mkdir("b/d", "", true);

Reimplemented in TDirectoryFile.

Definition at line 1102 of file TDirectory.cxx.

◆ OpenFile()

virtual TFile * TDirectory::OpenFile	(	const char *	,
		Option_t *	= `""`,
		const char *	= `""`,
		Int_t	= `1`,
		Int_t	= `0`
	)

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 240 of file TDirectory.h.

◆ operator=()

void TDirectory::operator= ( const TDirectory & )

protecteddelete

◆ Paint()

void TDirectory::Paint ( Option_t * option = "" )

overridevirtual

Paint all objects in the directory.

Reimplemented from TObject.

Reimplemented in TSQLFile, TXMLFile, and TFile.

Definition at line 1179 of file TDirectory.cxx.

◆ Print()

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

overridevirtual

Print all objects in the directory.

Reimplemented from TObject.

Reimplemented in TSQLFile, TXMLFile, TNetFile, TFile, and TMemFile.

Definition at line 1187 of file TDirectory.cxx.

◆ Purge()

virtual void TDirectory::Purge ( Short_t = 1 )

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 245 of file TDirectory.h.

◆ pwd()

void TDirectory::pwd ( ) const

virtual

Print the path of the directory.

Definition at line 1195 of file TDirectory.cxx.

◆ ReadAll()

virtual void TDirectory::ReadAll ( Option_t * = "" )

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 247 of file TDirectory.h.

◆ ReadKeys()

virtual Int_t TDirectory::ReadKeys ( Bool_t = kTRUE )

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 248 of file TDirectory.h.

◆ ReadTObject()

virtual Int_t TDirectory::ReadTObject	(	TObject *	,
		const char *
	)

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 249 of file TDirectory.h.

◆ RecursiveRemove()

void TDirectory::RecursiveRemove ( TObject * obj )

overridevirtual

Recursively remove object from a Directory.

Reimplemented from TObject.

Reimplemented in TROOT.

Definition at line 1203 of file TDirectory.cxx.

◆ RegisterContext()

void TDirectory::RegisterContext ( TContext * ctxt )

protected

Register a TContext pointing to this TDirectory object.

Definition at line 1365 of file TDirectory.cxx.

◆ RegisterGDirectory()

void TDirectory::RegisterGDirectory ( TDirectory::SharedGDirectory_t & gdirectory_ptr )

protected

Register a std::atomic<TDirectory*> that will soon be pointing to this TDirectory object.

Definition at line 1385 of file TDirectory.cxx.

◆ Remove()

TObject * TDirectory::Remove ( TObject * obj )

virtual

Remove an object from the in-memory list.

Reimplemented in TROOT.

Definition at line 1212 of file TDirectory.cxx.

◆ rmdir()

void TDirectory::rmdir ( const char * name )

virtual

Removes subdirectory from the directory When directory is deleted, all keys in all subdirectories will be read first and deleted from file (if exists) Equivalent call is Delete("name;*");.

Reimplemented in TDirectoryFile.

Definition at line 1227 of file TDirectory.cxx.

◆ Save()

virtual void TDirectory::Save ( )

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 253 of file TDirectory.h.

◆ SaveObjectAs()

Int_t TDirectory::SaveObjectAs	(	const TObject *	obj,
		const char *	filename = `""`,
		Option_t *	option = `""`
	)		const

virtual

Save object in filename, if filename is nullptr or "", a file with "<objectname>.root" is created.

The name of the key is the object name. By default new file will be created. Using option "a", one can append object to the existing ROOT file. If the operation is successful, it returns the number of bytes written to the file otherwise it returns 0. By default a message is printed. Use option "q" to not print the message. If filename contains ".json" extension, JSON representation of the object will be created and saved in the text file. Such file can be used in JavaScript ROOT (https://root.cern/js/) to display object in web browser When creating JSON file, option string may contain compression level from 0 to 3 (default 0)

Reimplemented in TDirectoryFile.

Definition at line 1250 of file TDirectory.cxx.

◆ SaveSelf()

virtual void TDirectory::SaveSelf ( Bool_t = kFALSE )

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 255 of file TDirectory.h.

◆ SetBufferSize()

virtual void TDirectory::SetBufferSize ( Int_t )

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 256 of file TDirectory.h.

◆ SetModified()

virtual void TDirectory::SetModified ( )

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 257 of file TDirectory.h.

◆ SetMother()

virtual void TDirectory::SetMother ( TObject * mother )

inlinevirtual

Definition at line 258 of file TDirectory.h.

◆ SetName()

void TDirectory::SetName ( const char * newname )

overridevirtual

Set the name for directory If the directory name is changed after the directory was written once, ROOT currently would NOT change the name of correspondent key in the mother directory.

DO NOT use this method to 'rename a directory'. Renaming a directory is currently NOT supported.

Reimplemented from TNamed.

Definition at line 1287 of file TDirectory.cxx.

◆ SetSeekDir()

virtual void TDirectory::SetSeekDir ( Long64_t )

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 261 of file TDirectory.h.

◆ SetTRefAction()

virtual void TDirectory::SetTRefAction	(	TObject *	,
		TObject *
	)

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 260 of file TDirectory.h.

◆ SetWritable()

virtual void TDirectory::SetWritable ( Bool_t )

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 262 of file TDirectory.h.

◆ Sizeof()

Int_t TDirectory::Sizeof ( ) const

inlineoverridevirtual

Return size of the TNamed part of the TObject.

Reimplemented from TNamed.

Reimplemented in TSQLFile, TXMLFile, TDirectoryFile, and TFile.

Definition at line 263 of file TDirectory.h.

◆ Streamer()

void TDirectory::Streamer ( TBuffer & R__b )

overridevirtual

TDirectory Streamer.

Reimplemented from TObject.

Reimplemented in TROOT, TDirectoryFile, TFile, TMemFile, TSQLFile, TXMLFile, TNetFile, TParallelMergingFile, TS3WebFile, TWebFile, TNetXNGFile, and RooWorkspace::WSDir.

Definition at line 1434 of file TDirectory.cxx.

◆ StreamerNVirtual()

void TDirectory::StreamerNVirtual ( TBuffer & ClassDef_StreamerNVirtual_b )

inline

Definition at line 308 of file TDirectory.h.

◆ UnregisterContext()

void TDirectory::UnregisterContext ( TContext * ctxt )

protected

UnRegister a TContext pointing to this TDirectory object.

Definition at line 1412 of file TDirectory.cxx.

◆ Write() [1/2]

virtual Int_t TDirectory::Write	(	const char *	name = `nullptr`,
		Int_t	option = `0`,
		Int_t	bufsize = `0`
	)		const

inlineoverridevirtual

Write this object to the current directory.

The data structure corresponding to this object is serialized. The corresponding buffer is written to the current directory with an associated key with name "name".

Writing an object to a file involves the following steps:

Creation of a support TKey object in the current directory. The TKey object creates a TBuffer object.
The TBuffer object is filled via the class::Streamer function.
If the file is compressed (default) a second buffer is created to hold the compressed buffer.
Reservation of the corresponding space in the file by looking in the TFree list of free blocks of the file.
The buffer is written to the file.

Bufsize can be given to force a given buffer size to write this object. By default, the buffersize will be taken from the average buffer size of all objects written to the current file so far.

If a name is specified, it will be the name of the key. If name is not given, the name of the key will be the name as returned by GetName().

The option can be a combination of: kSingleKey, kOverwrite or kWriteDelete Using the kOverwrite option a previous key with the same name is overwritten. The previous key is deleted before writing the new object. Using the kWriteDelete option a previous key with the same name is deleted only after the new object has been written. This option is safer than kOverwrite but it is slower. NOTE: Neither kOverwrite nor kWriteDelete reduces the size of a TFile– the space is simply freed up to be overwritten; in the case of a TTree, it is more complicated. If one opens a TTree, appends some entries, then writes it out, the behaviour is effectively the same. If, however, one creates a new TTree and writes it out in this way, only the metadata is replaced, effectively making the old data invisible without deleting it. TTree::Delete() can be used to mark all disk space occupied by a TTree as free before overwriting its metadata this way. The kSingleKey option is only used by TCollection::Write() to write a container with a single key instead of each object in the container with its own key.

An object is read from the file into memory via TKey::Read() or via TObject::Read().

The function returns the total number of bytes written to the file. It returns 0 if the object cannot be written.

Reimplemented from TObject.

Reimplemented in TSQLFile, TXMLFile, TFile, TParallelMergingFile, and TDirectoryFile.

Definition at line 265 of file TDirectory.h.

◆ Write() [2/2]

virtual Int_t TDirectory::Write	(	const char *	name = `nullptr`,
		Int_t	option = `0`,
		Int_t	bufsize = `0`
	)

inlineoverridevirtual

Write this object to the current directory.

For more see the const version of this method.

Reimplemented from TObject.

Reimplemented in TSQLFile, TXMLFile, TFile, TParallelMergingFile, ROOT::TBufferMergerFile, and TDirectoryFile.

Definition at line 264 of file TDirectory.h.

◆ WriteDirHeader()

virtual void TDirectory::WriteDirHeader ( )

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 302 of file TDirectory.h.

◆ WriteKeys()

virtual void TDirectory::WriteKeys ( )

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 303 of file TDirectory.h.

◆ WriteObject() [1/2]

template<typename T >

std::enable_if_t<!std::is_base_of< TObject, T >::value, Int_t > TDirectory::WriteObject	(	const T *	obj,
		const char *	name,
		Option_t *	option = `""`,
		Int_t	bufsize = `0`
	)

inline

Write an object with proper type checking.

Parameters

[in]	obj	Pointer to an object to be written.
[in]	name	Name of the object in the file.
[in]	option	Options. See TDirectory::WriteTObject.
[in]	bufsize	Buffer size. See TDirectory::WriteTObject.

This overload takes care of instances of classes that are not derived from TObject. The method redirects to TDirectory::WriteObjectAny.

Definition at line 282 of file TDirectory.h.

◆ WriteObject() [2/2]

template<typename T >

std::enable_if_t< std::is_base_of< TObject, T >::value, Int_t > TDirectory::WriteObject	(	const T *	obj,
		const char *	name,
		Option_t *	option = `""`,
		Int_t	bufsize = `0`
	)

inline

Write an object with proper type checking.

Parameters

[in]	obj	Pointer to an object to be written.
[in]	name	Name of the object in the file.
[in]	option	Options. See TDirectory::WriteTObject.
[in]	bufsize	Buffer size. See TDirectory::WriteTObject.

This overload takes care of instances of classes that are derived from TObject. The method redirects to TDirectory::WriteTObject.

Definition at line 296 of file TDirectory.h.

◆ WriteObjectAny() [1/2]

virtual Int_t TDirectory::WriteObjectAny	(	const void *	,
		const char *	,
		const char *	,
		Option_t *	= `""`,
		Int_t	= `0`
	)

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 300 of file TDirectory.h.

◆ WriteObjectAny() [2/2]

virtual Int_t TDirectory::WriteObjectAny	(	const void *	,
		const TClass *	,
		const char *	,
		Option_t *	= `""`,
		Int_t	= `0`
	)

inlinevirtual

Reimplemented in TDirectoryFile.

Definition at line 301 of file TDirectory.h.

◆ WriteTObject()

Int_t TDirectory::WriteTObject	(	const TObject *	obj,
		const char *	name = `nullptr`,
		Option_t *	= `""`,
		Int_t	= `0`
	)

virtual

Write an object with proper type checking.

Parameters

[in]	obj	Pointer to an object to be written.
[in]	name	Name of the object in the file.
[in]	option	Options. See TDirectory::WriteTObject.
[in]	bufsize	Buffer size. See TDirectory::WriteTObject.

This overload takes care of instances of classes that are not derived from TObject. The method redirects to TDirectory::WriteObjectAny.

Reimplemented in TDirectoryFile.

Definition at line 1400 of file TDirectory.cxx.

Friends And Related Symbol Documentation

◆ ROOT::Internal::TDirectoryAtomicAdapter

friend struct ROOT::Internal::TDirectoryAtomicAdapter

friend

Definition at line 169 of file TDirectory.h.

◆ TContext

friend class TContext

friend

Definition at line 168 of file TDirectory.h.

Member Data Documentation

◆ fContext

TContext* TDirectory::fContext {nullptr}

protected

Buffer for GetPath() function.

Definition at line 145 of file TDirectory.h.

◆ fContextPeg

std::atomic<size_t> TDirectory::fContextPeg {0}

protected

thread local gDirectory pointing to this object.

Definition at line 153 of file TDirectory.h.

◆ fgAddDirectory

Bool_t TDirectory::fgAddDirectory = kTRUE

staticprotected

MSVC doesn't support = ATOMIC_FLAG_INIT;.

Definition at line 156 of file TDirectory.h.

◆ fGDirectories

std::vector<SharedGDirectory_t> TDirectory::fGDirectories

protected

Definition at line 151 of file TDirectory.h.

◆ fList

TList* TDirectory::fList {nullptr}

protected

Definition at line 142 of file TDirectory.h.

◆ fMother

TObject* TDirectory::fMother {nullptr}

protected

Definition at line 141 of file TDirectory.h.

◆ fPathBuffer

TString TDirectory::fPathBuffer

mutableprotected

Definition at line 144 of file TDirectory.h.

◆ fSpinLock

std::atomic_flag TDirectory::fSpinLock

mutableprotected

Counter delaying the TDirectory destructor from finishing.

Definition at line 154 of file TDirectory.h.

◆ fUUID

TUUID TDirectory::fUUID

protected

Definition at line 143 of file TDirectory.h.

Libraries for TDirectory:

[legend]

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

core/base/inc/TDirectory.h
core/base/src/TDirectory.cxx

Classes

Public Member Functions

Static Public Member Functions

Protected Types

Protected Member Functions

Static Protected Member Functions

Protected Attributes

Static Protected Attributes

Friends

Additional Inherited Members

Member Typedef Documentation

◆ SharedGDirectory_t

Constructor & Destructor Documentation

◆ TDirectory() [1/3]

◆ TDirectory() [2/3]

◆ TDirectory() [3/3]

◆ ~TDirectory()

Member Function Documentation

◆ Add()

◆ AddDirectory()

◆ AddDirectoryStatus()

◆ Append()

◆ AppendKey()

◆ Browse()

◆ Build()

◆ BuildDirectory()

◆ cd() [1/2]

◆ cd() [2/2]

◆ Cd()

◆ cd1()

◆ Cd1()

◆ Class()

◆ Class_Name()

◆ Class_Version()

◆ CleanTargets()

◆ Clear()

◆ CloneObject()

◆ Close()

◆ Copy()

◆ CurrentDirectory()

◆ DeclFileName()

◆ DecodeNameCycle()

◆ Delete()

◆ DeleteAll()

◆ Draw()

◆ FillFullPath()

◆ FindKey()

◆ FindKeyAny()

◆ FindObject() [1/2]

◆ FindObject() [2/2]

◆ FindObjectAny()

◆ FindObjectAnyFile()

◆ Get() [1/2]

Example 1: Normal case:

Example 2: Special case:

◆ Get() [2/2]

◆ GetBufferSize()

◆ GetDirectory()

◆ GetFile()

◆ GetKey()

◆ GetList()

◆ GetListOfKeys()

◆ GetMother()

◆ GetMotherDir()

◆ GetNbytesKeys()

◆ GetNkeys()

◆ GetObject()

◆ GetObjectChecked() [1/2]

◆ GetObjectChecked() [2/2]

◆ GetObjectUnchecked()

◆ GetPath()

◆ GetPathStatic()

◆ GetSeekDir()

◆ GetSeekKeys()

◆ GetSeekParent()

◆ GetSharedLocalCurrentDirectory()

◆ GetUUID()

◆ IsA()

◆ IsBuilt()

◆ IsFolder()