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Reference Guide
TFree Class Reference

Service class for TFile.

Each file has a linked list of free segments. Each free segment is described by its firts and last address. When an object is written to a file, a new Key (see TKey) is created. The first free segment big enough to accomodate the object is used. If the object size has a length corresponding to the size of the free segment, the free segment is deleted from the list of free segments. When an object is deleted from a file, a new TFree object is generated. If the deleted object is contiguous to an already deleted object, the free segments are merged in one single segment.

Definition at line 27 of file TFree.h.

Public Member Functions

 TFree ()
 Default constructor. More...
 
 TFree (TList *lfree, Long64_t first, Long64_t last)
 Constructor for a free segment. More...
 
virtual ~TFree ()
 Destructor. More...
 
TFreeAddFree (TList *lfree, Long64_t first, Long64_t last)
 Add a new free segment to the list of free segments. More...
 
virtual void FillBuffer (char *&buffer)
 Encode fre structure into output buffer. More...
 
TFreeGetBestFree (TList *lfree, Int_t nbytes)
 Return the best free segment where to store nbytes. More...
 
Long64_t GetFirst () const
 
Long64_t GetLast () const
 
void ls (Option_t *="") const
 List free segment contents. More...
 
virtual void ReadBuffer (char *&buffer)
 Decode one free structure from input buffer. More...
 
void SetFirst (Long64_t first)
 
void SetLast (Long64_t last)
 
Int_t Sizeof () const
 return number of bytes occupied by this TFree on permanent storage 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 void Browse (TBrowser *b)
 Browse object. May be overridden for another default action. More...
 
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. More...
 
virtual const char * ClassName () const
 Returns name of class to which the object belongs. More...
 
virtual void Clear (Option_t *="")
 
virtual TObjectClone (const char *newname="") const
 Make a clone of an object using the Streamer facility. More...
 
virtual Int_t Compare (const TObject *obj) const
 Compare abstract method. More...
 
virtual void Copy (TObject &object) const
 Copy this to obj. 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 TObjectDrawClone (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 TObjectFindObject (const char *name) const
 Must be redefined in derived classes. More...
 
virtual TObjectFindObject (const TObject *obj) const
 Must be redefined in derived classes. More...
 
virtual Option_tGetDrawOption () const
 Get option used by the graphics system to draw this object. More...
 
virtual const char * GetIconName () const
 Returns mime type name of object. More...
 
virtual const char * GetName () const
 Returns name of 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_tGetOption () const
 
virtual const char * GetTitle () const
 Returns title of object. More...
 
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 ULong_t Hash () const
 Return hash value for this object. More...
 
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. 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...
 
virtual Bool_t IsFolder () const
 Returns kTRUE in case object contains browsable objects (like containers or lists of other objects). More...
 
R__ALWAYS_INLINE Bool_t IsOnHeap () const
 
virtual Bool_t IsSortable () 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). 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...
 
voidoperator new (size_t sz)
 
voidoperator new (size_t sz, void *vp)
 
voidoperator new[] (size_t sz)
 
voidoperator new[] (size_t sz, void *vp)
 
TObjectoperator= (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 void Print (Option_t *option="") const
 This method must be overridden when a class wants to print itself. 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)
 
void SetBit (UInt_t f, Bool_t set)
 Set or unset the user status bits as specified in f. More...
 
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...
 
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. 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...
 

Protected Attributes

Long64_t fFirst
 First free word of segment. More...
 
Long64_t fLast
 Last free word of segment. More...
 

Additional Inherited Members

- Public Types inherited from TObject
enum  {
  kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kInconsistent = 0x08000000,
  kBitMask = 0x00ffffff
}
 
enum  { kSingleKey = BIT(0), kOverwrite = BIT(1), kWriteDelete = BIT(2) }
 
enum  EDeprecatedStatusBits { kObjInCanvas = BIT(3) }
 
enum  EStatusBits {
  kCanDelete = BIT(0), kMustCleanup = BIT(3), kIsReferenced = BIT(4), kHasUUID = BIT(5),
  kCannotPick = BIT(6), kNoContextMenu = BIT(8), kInvalidObject = BIT(13)
}
 
- 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 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 ()
 

#include <TFree.h>

Inheritance diagram for TFree:
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Constructor & Destructor Documentation

◆ TFree() [1/2]

TFree::TFree ( )

Default constructor.

Definition at line 40 of file TFree.cxx.

◆ TFree() [2/2]

TFree::TFree ( TList lfree,
Long64_t  first,
Long64_t  last 
)

Constructor for a free segment.

Definition at line 48 of file TFree.cxx.

◆ ~TFree()

TFree::~TFree ( )
virtual

Destructor.

Definition at line 102 of file TFree.cxx.

Member Function Documentation

◆ AddFree()

TFree * TFree::AddFree ( TList lfree,
Long64_t  first,
Long64_t  last 
)

Add a new free segment to the list of free segments.

  • if last just precedes an existing free segment, then first becomes the new starting location of the free segment.
  • if first just follows an existing free segment, then last becomes the new ending location of the free segment.
  • if first just follows an existing free segment AND last just precedes an existing free segment, these two segments are merged into one single segment.

Definition at line 67 of file TFree.cxx.

◆ FillBuffer()

void TFree::FillBuffer ( char *&  buffer)
virtual

Encode fre structure into output buffer.

Definition at line 109 of file TFree.cxx.

◆ GetBestFree()

TFree * TFree::GetBestFree ( TList lfree,
Int_t  nbytes 
)

Return the best free segment where to store nbytes.

Definition at line 127 of file TFree.cxx.

◆ GetFirst()

Long64_t TFree::GetFirst ( ) const
inline

Definition at line 40 of file TFree.h.

◆ GetLast()

Long64_t TFree::GetLast ( ) const
inline

Definition at line 41 of file TFree.h.

◆ ls()

void TFree::ls ( Option_t = "") const
virtual

List free segment contents.

Reimplemented from TObject.

Definition at line 159 of file TFree.cxx.

◆ ReadBuffer()

void TFree::ReadBuffer ( char *&  buffer)
virtual

Decode one free structure from input buffer.

Definition at line 167 of file TFree.cxx.

◆ SetFirst()

void TFree::SetFirst ( Long64_t  first)
inline

Definition at line 44 of file TFree.h.

◆ SetLast()

void TFree::SetLast ( Long64_t  last)
inline

Definition at line 45 of file TFree.h.

◆ Sizeof()

Int_t TFree::Sizeof ( ) const

return number of bytes occupied by this TFree on permanent storage

Definition at line 184 of file TFree.cxx.

Member Data Documentation

◆ fFirst

Long64_t TFree::fFirst
protected

First free word of segment.

Definition at line 30 of file TFree.h.

◆ fLast

Long64_t TFree::fLast
protected

Last free word of segment.

Definition at line 31 of file TFree.h.

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