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Tuples::Tuple Class Reference

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

`#include <GaudiAlg/Tuple.h>`

Collaboration diagram for Tuples::Tuple:
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## 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..nosp@m.Bely.nosp@m.aev@i.nosp@m.tep..nosp@m.ru

Date
  2003-02-24

Definition at line 115 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 140 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 148 of file Tuple.h.

{ return m_tuple ; }

bool Tuples::Tuple::valid | ( |  | ) | const
| inline

check the validity of the tuple object

Definition at line 143 of file Tuple.h.

{ return 0 != tuple () ; }

## Member Data Documentation

TupleObj* Tuples::Tuple::m_tuple
| private

The tuple object.

Definition at line 158 of file Tuple.h.

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

- /afs/cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v25r0/GaudiAlg/GaudiAlg/Tuple.h
- /afs/cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v25r0/GaudiAlg/src/lib/Tuple.cpp