Tuples::Tuple Class Reference

A simple wrapper class over standard Gaudi NTuple::Tuple facility. More...

#include <GaudiAlg/Tuple.h>

Collaboration diagram for Tuples::Tuple:

[legend]

List of all members.

Public Member Functions
	Tuple (TupleObj *tuple)
	standard constructor
	Tuple (const Tuple &tuple)
	copy constructor
virtual	~Tuple ()
	destructor
Tuple &	operator= (const Tuple &tuple)
	assignment operator Tuples could be assigned in a safe way
TupleObj *	operator-> () const
	get the pointer to the underlying object
bool	valid () const
	check the validity of the tuple object
Protected Member Functions
TupleObj *	tuple () const
	Return the underlying tuple object.
Private Member Functions
	Tuple ()
	default constructor is private
Private Attributes
TupleObj *	m_tuple
	The tuple object.

---

Detailed Description

A simple wrapper class over standard Gaudi NTuple::Tuple facility.

The main advantages of local ntuples with respect to 'standard' Gaudi NTuples ( NTuple::Tuple ) is their "locality". For 'standard' ntuples one need

1. Define all ntuple columns/items as data members of the algorithm
2. Book the NTuple::Tuple object using INTupleSvc
3. Add all defined columns/items to the booked ntuple
4. Fill ntuple records

Usually the first step is done in the header file (separate file!) of the algorithm, the second and the third steps are done in initialize() method of the algorithm and the fourth step is done somewhere in execute() method of the same algorithm. Such approach requires to keep track of the tuple structure through different method and event through different files. And even minor modification of the structure of the ntuple will require the modification of at least 2 methods and 2 files.

The Tuples::Tuple wrapper over standard Gaudi NTuple::Tuple class solves all above listed problems with "non-local" nature of Gaudi NTuple::Tuple objects.

Tuples::Tuple object is booked and used 'locally'. One does not need to pre-book the ntuple or its columns/items somewhere in different compilation units or other methods different from the actual point of using the ntuple.

The simplest example of usage Tuple object:

  Tuple tuple = nTuple( "some more or less unique tuple title ");
  for( Loop D0 = loop( "K- pi+", "D0" ) , D0 , ++D0 )
  {
     tuple -> column ( "mass" , M  ( D0 ) / GeV ) ;
     tuple -> column ( "pt"   , PT ( D0 ) / GeV ) ;
     tuple -> column ( "p"    , P  ( D0 ) / GeV ) ;
     tuple -> write  () ;
  }

One could fill some Tuple variables in one go

  Tuple tuple = nTuple( "some more or less unique tuple title ");
  for( Loop D0 = loop( "K- pi+", "D0" ) , D0 , ++D0 )
  {
     tuple -> column ( "mass"      , M  ( D0 ) / GeV ) ;
     tuple -> fill   ( "pt , p "   , PT ( D0 ) / GeV , P(D0) / GeV ) ;
     tuple -> write  () ;
  }

Even ALL variables could be filled in one go:

  Tuple tuple = nTuple( "some more or less unique tuple title ");
  for( Loop D0 = loop( "K- pi+", "D0" ) , D0 , ++D0 )
  {
     tuple -> fill   ( "mass pt , p ", M(D0)/GeV,PT(D0)/GeV,P(D0)/GeV ) ;
     tuple -> write  () ;
  }

All these techniques could be easily combined in arbitrary ways

See also:

GaudiTupleAlg

TupleObj

Author:

Vanya BELYAEV Ivan.Belyaev@itep.ru

Date:

2003-02-24

Definition at line 116 of file Tuple.h.

---

Constructor & Destructor Documentation

Tuples::Tuple::Tuple

(

Tuples::TupleObj *

tuple

)

standard constructor

Standard constructor.

Parameters:

tuple

pointer to "real" tuple object

Definition at line 24 of file Tuple.cpp.

  : m_tuple( tuple )
{
  if( 0 != m_tuple ) { m_tuple -> addRef () ; }
}

Tuples::Tuple::Tuple

(

const Tuple &

tuple

)

copy constructor

Definition at line 35 of file Tuple.cpp.

  : m_tuple ( tuple.m_tuple )
{
  if( 0 != m_tuple ) { m_tuple ->addRef() ; }
}

Tuples::Tuple::~Tuple

(

)

[virtual]

destructor

Definition at line 68 of file Tuple.cpp.

{
  if( 0 != m_tuple ) { m_tuple->release() ; }
}

Tuples::Tuple::Tuple

(

)

[private]

default constructor is private

---

Member Function Documentation

TupleObj* Tuples::Tuple::operator->

(

)

const [inline]

get the pointer to the underlying object

Returns:

pointer to underlying TupleObj

Definition at line 141 of file Tuple.h.

{ return      tuple () ; }

Tuples::Tuple & Tuples::Tuple::operator=

(

const Tuple &

tuple

)

assignment operator Tuples could be assigned in a safe way

Parameters:

tuple

tuple to be assigned

Definition at line 48 of file Tuple.cpp.

{
  // self assigenment
  if( &tuple == this ) { return *this; }
  // temporary variable
  Tuples::TupleObj* tmp = tuple.m_tuple ;
  // increse reference count
  if( 0 !=    tmp  ) { tmp     -> addRef  () ; }
  // decrease reference count
  if( 0 != m_tuple ) { m_tuple -> release () ; }
  // assign
  m_tuple = tmp ;
  //
  return *this ;
}

TupleObj* Tuples::Tuple::tuple

(

)

const [inline, protected]

Return the underlying tuple object.

Definition at line 149 of file Tuple.h.

{ return m_tuple ; }

bool Tuples::Tuple::valid

(

)

const [inline]

check the validity of the tuple object

Definition at line 144 of file Tuple.h.

{ return 0 != tuple () ; }

---

Member Data Documentation

TupleObj* Tuples::Tuple::m_tuple [private]

The tuple object.

Definition at line 159 of file Tuple.h.

---

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

• /afs/cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v22r0/GaudiAlg/GaudiAlg/Tuple.h
• /afs/cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v22r0/GaudiAlg/src/lib/Tuple.cpp