Used by TEntryList to store the entry numbers.

There are 2 ways to represent entry numbers in a TEntryListBlock:

as bits, where passing entry numbers are assigned 1, not passing - 0
as a simple array of entry numbers
- storing the numbers of entries that pass
- storing the numbers of entries that don't pass

In both cases, a UShort_t* is used. The second option is better in case less than 1/16 or more than 15/16 of entries pass the selection, and the representation can be changed by calling OptimizeStorage() function. When the block is being filled, it's always stored as bits, and the OptimizeStorage() function is called by TEntryList when it starts filling the next block. If Enter() or Remove() is called after OptimizeStorage(), representation is again changed to 1).

{
//=========Macro generated from canvas: c/c
//=========  (Fri Mar 16 18:59:21 2007) by ROOT version5.15/03
   TCanvas *c = new TCanvas("c", "c",49,123,752,435);
   c->Range(0,0,1,1);
   c->SetBorderSize(2);
   c->SetFrameFillColor(0);
   TPaveText *pt = new TPaveText(0.00313972,0.650146,0.22135,0.772595,"br");
   pt->SetFillColor(19);
   TText *text = pt->AddText("TEntryListBlock");
   pt->Draw();
   pt = new TPaveText(0.00313972,0.827988,0.675039,0.994169,"br");
   pt->SetFillColor(19);
   pt->SetTextColor(4);
   text = pt->AddText("Indices representation in a TEntryListBlock");
   pt->Draw();
   pt = new TPaveText(0.00410678,0.412955,0.221766,0.651822,"br");
   pt->SetFillColor(19);
   pt->SetTextAlign(12);
   pt->SetTextSize(0.048583);
   text = pt->AddText("UShort_t* fIndices");
   text = pt->AddText("Int_t fType");
   pt->Draw();
   pt = new TPaveText(0.324961,0.708455,0.959184,0.804665,"br");
   pt->SetFillColor(19);
   text = pt->AddText("Suppose,that this block stores entries");
   text = pt->AddText("0, 2, 4, 10, 11, 12");
   pt->Draw();
   pt = new TPaveText(0.232227,0.541176,0.333333,0.641176,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("fType=0");
   text->SetTextAngle(-15);
   pt->Draw();
   pt = new TPaveText(0.355114,0.189066,0.457386,0.255125,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("fIndices[0]");
   pt->Draw();
   pt = new TPaveText(0.521193,0.38484,0.77708,0.48105,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("fIndices[0]");
   pt->Draw();
   pt = new TPaveText(0.355619,0.239726,0.458037,0.305936,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   pt->SetTextSize(0.0342466);
   text = pt->AddText("0");
   pt->Draw();
   pt = new TPaveText(0.264241,0.383481,0.363924,0.486726,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("fType=1");
   text->SetTextAngle(-50);
   pt->Draw();
   pt = new TPaveText(0.458807,0.173121,0.559659,0.273349,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("fIndices[1]");
   pt->Draw();
   pt = new TPaveText(0.473684,0.251142,0.540541,0.299087,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   pt->SetTextSize(0.0342466);
   text = pt->AddText("2");
   pt->Draw();
   pt = new TPaveText(0.556818,0.193622,0.659091,0.250569,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("fIndices[2]");
   pt->Draw();
   pt = new TPaveText(0.55761,0.244292,0.660028,0.30137,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   pt->SetTextSize(0.0342466);
   text = pt->AddText("4");
   pt->Draw();
   pt = new TPaveText(0.659091,0.191344,0.758523,0.255125,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("fIndices[3]");
   pt->Draw();
   pt = new TPaveText(0.657183,0.239726,0.756757,0.303653,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   pt->SetTextSize(0.0342466);
   text = pt->AddText("10");
   pt->Draw();
   pt = new TPaveText(0.759943,0.189066,0.859375,0.255125,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("fIndices[4]");
   pt->Draw();
   pt = new TPaveText(0.758179,0.239726,0.857752,0.305936,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   pt->SetTextSize(0.0342466);
   text = pt->AddText("11");
   pt->Draw();
   pt = new TPaveText(0.859943,0.189066,0.959375,0.255125,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("fIndices[5]");
   pt->Draw();
   pt = new TPaveText(0.852063,0.239726,0.951636,0.305936,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   pt->SetTextSize(0.0342466);
   text = pt->AddText("12");
   pt->Draw();
   pt = new TPaveText(0.786325,0.503432,0.830484,0.549199,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("1");
   pt->Draw();
   pt = new TPaveText(0.750712,0.503432,0.796296,0.549199,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("1");
   pt->Draw();
   pt = new TPaveText(0.825472,0.5,0.871069,0.54386,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("0");
   pt->Draw();
   pt = new TPaveText(0.863208,0.5,0.908805,0.54386,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("0");
   pt->Draw();
   pt = new TPaveText(0.902516,0.5,0.948113,0.54386,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("0");
   pt->Draw();
   pt = new TPaveText(0.677673,0.5,0.72327,0.54386,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("0");
   pt->Draw();
   pt = new TPaveText(0.639937,0.5,0.685535,0.54386,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("0");
   pt->Draw();
   pt = new TPaveText(0.602201,0.5,0.647799,0.54386,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("0");
   pt->Draw();
   pt = new TPaveText(0.564465,0.5,0.610063,0.54386,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("0");
   pt->Draw();
   pt = new TPaveText(0.529874,0.5,0.575472,0.54386,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("0");
   pt->Draw();
   pt = new TPaveText(0.45283,0.502924,0.498428,0.546784,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("0");
   pt->Draw();
   pt = new TPaveText(0.380503,0.502924,0.426101,0.546784,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("0");
   pt->Draw();
   pt = new TPaveText(0.710826,0.503432,0.766382,0.549199,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("1");
   pt->Draw();
   pt = new TPaveText(0.487179,0.505721,0.532764,0.551487,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   pt->SetTextSize(0.0389016);
   text = pt->AddText("1");
   pt->Draw();
   pt = new TPaveText(0.413105,0.501144,0.460114,0.549199,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   pt->SetTextSize(0.0389016);
   text = pt->AddText("1");
   pt->Draw();
   pt = new TPaveText(0.344729,0.505721,0.393162,0.551487,"br");
   pt->SetBorderSize(0);
   pt->SetFillColor(19);
   text = pt->AddText("1");
   pt->Draw();
   TArrow *arrow = new TArrow(0.225552,0.572271,0.35489,0.283186,0.03,"|>");
   arrow->SetFillColor(1);
   arrow->SetFillStyle(1001);
   arrow->Draw();
   arrow = new TArrow(0.22082,0.581121,0.344937,0.519174,0.03,"|>");
   arrow->SetFillColor(1);
   arrow->SetFillStyle(1001);
   arrow->Draw();
   TLine *line = new TLine(0.35,0.5,0.95,0.5);
   line->Draw();
   line = new TLine(0.35,0.49,0.35,0.51);
   line->Draw();
   line = new TLine(0.3875,0.49,0.3875,0.51);
   line->Draw();
   line = new TLine(0.419,0.49,0.419,0.51);
   line->Draw();
   line = new TLine(0.4565,0.49,0.4565,0.51);
   line->Draw();
   line = new TLine(0.494,0.49,0.494,0.51);
   line->Draw();
   line = new TLine(0.5315,0.49,0.5315,0.51);
   line->Draw();
   line = new TLine(0.569,0.49,0.569,0.51);
   line->Draw();
   line = new TLine(0.6065,0.49,0.6065,0.51);
   line->Draw();
   line = new TLine(0.644,0.48,0.644,0.52);
   line->Draw();
   line = new TLine(0.6815,0.49,0.6815,0.51);
   line->Draw();
   line = new TLine(0.719,0.49,0.719,0.51);
   line->Draw();
   line = new TLine(0.7565,0.49,0.7565,0.51);
   line->Draw();
   line = new TLine(0.794,0.49,0.794,0.51);
   line->Draw();
   line = new TLine(0.8315,0.49,0.8315,0.51);
   line->Draw();
   line = new TLine(0.869,0.49,0.869,0.51);
   line->Draw();
   line = new TLine(0.9065,0.49,0.9065,0.51);
   line->Draw();
   line = new TLine(0.944,0.49,0.944,0.51);
   line->Draw();
   line = new TLine(0.944,0.49,0.944,0.51);
   line->Draw();
   line = new TLine(0.36,0.251142,0.96,0.251142);
   line->Draw();
   line = new TLine(0.36,0.24,0.36,0.26);
   line->Draw();
   line = new TLine(0.46,0.24,0.46,0.26);
   line->Draw();
   line = new TLine(0.56,0.24,0.56,0.26);
   line->Draw();
   line = new TLine(0.66,0.24,0.66,0.26);
   line->Draw();
   line = new TLine(0.76,0.24,0.76,0.26);
   line->Draw();
   line = new TLine(0.86,0.24,0.86,0.26);
   line->Draw();
   line = new TLine(0.96,0.24,0.96,0.26);
   line->Draw();
   return c;
}

Operations on blocks (see also function comments)

Merge() - adds all entries from one block to the other. If the first block uses array representation, it's changed to bits representation only if the total number of passing entries is still less than kBlockSize
GetEntry(n) - returns n-th non-zero entry.
Next() - return next non-zero entry. In case of representation 1), Next() is faster than GetEntry()

Definition at line 45 of file TEntryListBlock.h.

Public Types
enum	{ kBlockSize = 4000 }

Public Types inherited from TObject
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) }

enum	{ kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kBitMask = 0x00ffffff }

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

Public Member Functions
	TEntryListBlock ()

	TEntryListBlock (const TEntryListBlock &eblock)
	Copy c-tor. More...

	~TEntryListBlock ()
	Destructor. More...

TEntryListBlock &	operator= (const TEntryListBlock &rhs)

Bool_t	Enter (Int_t entry)
	If the block has already been optimized and the entries are stored as a list and not as bits, trying to enter a new entry will make the block switch to bits representation. More...

Bool_t	Remove (Int_t entry)
	Remove entry entry If the block has already been optimized and the entries are stored as a list and not as bits, trying to remove a new entry will make the block switch to bits representation. More...

Int_t	Contains (Int_t entry)
	True if the block contains entry entry. More...

void	OptimizeStorage ()
	If there are < kBlockSize or >kBlockSize*15 entries, change to an array representation. More...

Int_t	Merge (TEntryListBlock *block)
	Merge with the other block Returns the resulting number of entries in the block. More...

Int_t	Next ()
	Return the next non-zero entry Faster than GetEntry() function. More...

Int_t	GetEntry (Int_t entry)
	Return entry entry. More...

void	ResetIndices ()

Int_t	GetType ()

Int_t	GetNPassed ()
	Returns the number of entries, passing the selection. More...

virtual void	Print (const Option_t *option="") const
	Print the entries in this block. More...

void	PrintWithShift (Int_t shift) const
	Print the indices of this block + shift (used from TEntryList::Print()) to print the corrent values. More...

Public Member Functions inherited from TObject
	TObject ()

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

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

virtual	~TObject ()
	TObject destructor. 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...

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

virtual void	Clear (Option_t *="")

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 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 TObject *	DrawClone (Option_t *option="") const
	Draw a clone of this object in the current pad. More...

virtual void	Dump () const
	Dump contents of object on stdout. 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 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 UInt_t	GetUniqueID () const
	Return the unique object id. More...

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

virtual const char *	GetIconName () const
	Returns mime type name of object. More...

virtual Option_t *	GetOption () const

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

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

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...

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

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	IsSortable () const

Bool_t	IsOnHeap () const

Bool_t	IsZombie () const

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

virtual void	ls (Option_t *option="") const
	The ls function lists the contents of a class on stdout. 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...

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...

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	UseCurrentStyle ()
	Set current style settings in this object This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked. 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...

void *	operator new (size_t sz)

void *	operator new[] (size_t sz)

void *	operator new (size_t sz, void *vp)

void *	operator new[] (size_t sz, void *vp)

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

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

void	ResetBit (UInt_t f)

Bool_t	TestBit (UInt_t f) const

Int_t	TestBits (UInt_t f) const

void	InvertBit (UInt_t f)

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

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

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

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

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

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...

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

Protected Member Functions
void	Transform (Bool_t dir, UShort_t *indexnew)
	to optimize GetEntry() in a loop More...

Protected Member Functions inherited from TObject
void	MakeZombie ()

virtual void	DoError (int level, const char location, const char fmt, va_list va) const
	Interface to ErrorHandler (protected). More...

Protected Attributes
Int_t	fNPassed

Int_t	fN

UShort_t *	fIndices

Int_t	fType

Bool_t	fPassing

UShort_t	fCurrent

Int_t	fLastIndexQueried
	to fasten Contains() in list mode More...

Int_t	fLastIndexReturned
	to optimize GetEntry() in a loop More...

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

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

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

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

#include <TEntryListBlock.h>

Inheritance diagram for TEntryListBlock:

Collaboration diagram for TEntryListBlock:

Member Enumeration Documentation

anonymous enum

Enumerator
kBlockSize

Definition at line 63 of file TEntryListBlock.h.

Constructor & Destructor Documentation

TEntryListBlock::TEntryListBlock ( )

TEntryListBlock::TEntryListBlock ( const TEntryListBlock & eblock )

Copy c-tor.

Definition at line 68 of file TEntryListBlock.cxx.

TEntryListBlock::~TEntryListBlock ( )

Destructor.

Definition at line 89 of file TEntryListBlock.cxx.

Member Function Documentation

Int_t TEntryListBlock::Contains ( Int_t entry )

True if the block contains entry entry.

Definition at line 193 of file TEntryListBlock.cxx.

Referenced by TEntryList::Contains(), Merge(), and Next().

Bool_t TEntryListBlock::Enter ( Int_t entry )

If the block has already been optimized and the entries are stored as a list and not as bits, trying to enter a new entry will make the block switch to bits representation.

Definition at line 127 of file TEntryListBlock.cxx.

Referenced by TEntryList::Enter(), and Merge().

Int_t TEntryListBlock::GetEntry ( Int_t entry )

Return entry entry.