---

HcalDetId Class Reference

Cell identifier class for the HCAL subdetectors, precision readout cells only. More...

#include <DataFormats/HcalDetId/interface/HcalDetId.h>

Inheritance diagram for HcalDetId:

List of all members.

Public Types
enum	{ kSizeForDenseIndexing = 2*kHcalhalf }
Public Member Functions
int	crystal_ieta_high () const
	get the largest crystal_ieta of the crystal in front of this tower (HB and HE tower 17 only)
int	crystal_ieta_low () const
	get the smallest crystal_ieta of the crystal in front of this tower (HB and HE tower 17 only)
int	crystal_iphi_high () const
	get the largest crystal_iphi of the crystal in front of this tower (HB and HE tower 17 only)
int	crystal_iphi_low () const
	get the smallest crystal_iphi of the crystal in front of this tower (HB and HE tower 17 only)
uint32_t	denseIndex () const
int	depth () const
	get the tower depth
int	hashed_index () const
	HcalDetId (const DetId &id)
	Constructor from a generic cell id.
	HcalDetId (HcalSubdetector subdet, int tower_ieta, int tower_iphi, int depth)
	Constructor from subdetector, signed tower ieta,iphi,and depth.
	HcalDetId (uint32_t rawid)
	Create cellid from raw id (0=invalid tower id).
	HcalDetId ()
	Create a null cellid.
int	ieta () const
	get the cell ieta
int	ietaAbs () const
	get the absolute value of the cell ieta
int	iphi () const
	get the cell iphi
HcalDetId &	operator= (const DetId &id)
	Assignment from a generic cell id.
HcalSubdetector	subdet () const
	get the subdetector
int	zside () const
	get the z-side of the cell (1/-1)
Static Public Member Functions
static HcalDetId	detIdFromDenseIndex (uint32_t di)
static bool	validDenseIndex (uint32_t din)
static bool	validDetId (HcalSubdetector subdet, int tower_ieta, int tower_iphi, int depth)
Static Public Attributes
static const HcalDetId	Undefined
Private Types
enum	{   kHBhalf = 1296, kHEhalf = 1296, kHOhalf = 1080, kHFhalf = 864,   kHcalhalf = kHBhalf + kHEhalf + kHOhalf + kHFhalf }

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Detailed Description

Cell identifier class for the HCAL subdetectors, precision readout cells only.

Date

2008/06/25 22:13:29

Revision

1.12

Author:

J. Mans - Minnesota

Rev.1.11: A.Kubik,R.Ofierzynski: add the hashed_index

Definition at line 19 of file HcalDetId.h.

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Member Enumeration Documentation

anonymous enum [private]

Enumerator:

kHBhalf
kHEhalf
kHOhalf
kHFhalf
kHcalhalf

Definition at line 71 of file HcalDetId.h.

           { kHBhalf = 1296 ,
             kHEhalf = 1296 ,
             kHOhalf = 1080 ,
             kHFhalf = 864  ,
             kHcalhalf = kHBhalf + kHEhalf + kHOhalf + kHFhalf } ;

anonymous enum

Enumerator:

kSizeForDenseIndexing

Definition at line 79 of file HcalDetId.h.

{ kSizeForDenseIndexing = 2*kHcalhalf } ;

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Constructor & Destructor Documentation

HcalDetId::HcalDetId

(

)

Create a null cellid.

Definition at line 6 of file HcalDetId.cc.

Referenced by detIdFromDenseIndex().

                     : DetId() {
}

HcalDetId::HcalDetId

(

uint32_t

rawid

)

Create cellid from raw id (0=invalid tower id).

Definition at line 9 of file HcalDetId.cc.

                                   : DetId(rawid) {
}

HcalDetId::HcalDetId	(	HcalSubdetector	subdet,
		int	tower_ieta,
		int	tower_iphi,
		int	depth
	)

Constructor from subdetector, signed tower ieta,iphi,and depth.

Definition at line 12 of file HcalDetId.cc.

References DetId::id_.

                                                                                      : DetId(Hcal,subdet) {
  // (no checking at this point!)
  id_ |= ((depth&0x7)<<14) |
    ((tower_ieta>0)?(0x2000|(tower_ieta<<7)):((-tower_ieta)<<7)) |
    (tower_iphi&0x7F);
}

HcalDetId::HcalDetId

(

const DetId &

id

)

Constructor from a generic cell id.

Definition at line 19 of file HcalDetId.cc.

References DetId::det(), Exception, DetId::Hcal, HcalBarrel, HcalEndcap, HcalForward, HcalOuter, DetId::id_, DetId::null(), DetId::rawId(), subdet(), and DetId::subdetId().

                                     {
  if (!gen.null()) {
    HcalSubdetector subdet=(HcalSubdetector(gen.subdetId()));
    if (gen.det()!=Hcal || 
        (subdet!=HcalBarrel && subdet!=HcalEndcap && 
         subdet!=HcalOuter && subdet!=HcalForward ))
      {
        throw cms::Exception("Invalid DetId") << "Cannot initialize HcalDetId from " << std::hex << gen.rawId() << std::dec; 
      }  
  }
  id_=gen.rawId();
}

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Member Function Documentation

int HcalDetId::crystal_ieta_high

(

)

const [inline]

get the largest crystal_ieta of the crystal in front of this tower (HB and HE tower 17 only)

Definition at line 47 of file HcalDetId.h.

References ieta(), and zside().

Referenced by CaloTowerConstituentsMap::constituentsOf().

{ return ((ieta()-zside())*5)+5*zside(); }

int HcalDetId::crystal_ieta_low

(

)

const [inline]

get the smallest crystal_ieta of the crystal in front of this tower (HB and HE tower 17 only)

Definition at line 45 of file HcalDetId.h.

References ieta(), and zside().

Referenced by CaloTowerConstituentsMap::constituentsOf().

{ return ((ieta()-zside())*5)+zside(); }

int HcalDetId::crystal_iphi_high

(

)

const

get the largest crystal_iphi of the crystal in front of this tower (HB and HE tower 17 only)

Definition at line 52 of file HcalDetId.cc.

References iphi().

Referenced by CaloTowerConstituentsMap::constituentsOf().

                                       { 
  int simple_iphi=((iphi()-1)*5)+5; 
  simple_iphi+=10;
  return ((simple_iphi>360)?(simple_iphi-360):(simple_iphi));
}

int HcalDetId::crystal_iphi_low

(

)

const

get the smallest crystal_iphi of the crystal in front of this tower (HB and HE tower 17 only)

Definition at line 46 of file HcalDetId.cc.

References iphi().

Referenced by CaloTowerConstituentsMap::constituentsOf().

                                      { 
  int simple_iphi=((iphi()-1)*5)+1; 
  simple_iphi+=10;
  return ((simple_iphi>360)?(simple_iphi-360):(simple_iphi));
}

uint32_t HcalDetId::denseIndex

(

)

const [inline]

Definition at line 61 of file HcalDetId.h.

References hashed_index().

{ return hashed_index() ; }

int HcalDetId::depth

(

)

const [inline]

get the tower depth

Definition at line 43 of file HcalDetId.h.

References DetId::id_.

Referenced by HcaluLUTTPGCoder::adc2Linear(), HcalTriggerPrimitiveAlgo::addSignal(), HFLightCalRand::analyze(), HCALRecHitAnalyzer::analyze(), HFLightCal::analyze(), JetToDigiDump::analyze(), cms::HcalConstantsASCIIWriter::analyze(), HFPreLightCal::analyze(), CaloTowersCreationAlgo::assignHit(), CaloRecHitCandidateProducer::cellTresholdAndWeight(), CaloGeometryHelper::getClosestCell(), CaloTowersCreationAlgo::getThresholdAndWeight(), hashed_index(), HcalGenericDetId::hashedId(), hpdId(), HcalTopology::incrementDepth(), DetIdInfo::info(), HcalText2DetIdConverter::init(), HcalHardcodeGeometryLoader::makeCell(), JetAnalyzer::MakeCellListFromCaloTowers(), HcalLEDMonitor::perChanHists(), HcalLaserMonitor::perChanHists(), HcalCableMapper::process(), HcalDigiMonitor::processEvent(), HcalTrigPrimMonitor::processEvent(), HcalPedestalMonitor::processEvent(), HcalDeadCellMonitor::processEvent_digi(), HcalHotCellMonitor::processEvent_pedestal(), HcalDummyHitProducer::produce(), CaloTowersCreationAlgo::rescale(), HcalSimParameterMap::simParameters(), and HcalTrigTowerGeometry::towerIds().

{ return (id_>>14)&0x7; }

HcalDetId HcalDetId::detIdFromDenseIndex

(

uint32_t

di

)

[static]

Definition at line 154 of file HcalDetId.cc.

References HcalBarrel, HcalDetId(), HcalEndcap, HcalForward, HcalOuter, in, kHBhalf, kHEhalf, kHFhalf, kHOhalf, and validDenseIndex().

{
    if( validDenseIndex( di ) )
    {
      HcalSubdetector sd ( HcalBarrel ) ;
      int ie ( 0 ) ;
      int ip ( 0 ) ;
      int dp ( 0 ) ;
      int in ( di ) ;
      int iz ( 1 ) ;
      if( in > 2*( kHBhalf + kHEhalf + kHOhalf ) - 1 )
      {
         sd  = HcalForward ;
         in -= 2*( kHBhalf + kHEhalf + kHOhalf ) ; 
         iz  = ( in<kHFhalf ? 1 : -1 ) ;
         in %= kHFhalf ; 
         ip  = 4*( in/48 ) ;
         in %= 48 ;
         ip += 1 + ( in>21 ? 2 : 0 ) ;
         if( 3 == ip%4 ) in -= 22 ;
         ie  = 29 + in/2 ;
         dp  = 1 + in%2 ;
      }
      else
      {
         if( in > 2*( kHBhalf + kHEhalf ) - 1 )
         {
            sd  = HcalOuter ;
            in -= 2*( kHBhalf + kHEhalf ) ; 
            iz  = ( in<kHOhalf ? 1 : -1 ) ;
            in %= kHOhalf ; 
            dp  = 4 ;
            ip  = 1 + in/15 ;
            ie  = 1 + ( in - 15*( ip - 1 ) ) ;
         }
         else
         {
            if( in > 2*kHBhalf - 1 )
            {
               sd  = HcalEndcap ;
               in -= 2*kHBhalf ;
               iz  = ( in<kHEhalf ? 1 : -1 ) ;
               in %= kHEhalf ; 
               ip  = 2*( in/36 ) ;
               in %= 36 ;
               ip += 1 + in/28 ;
               if( 0 == ip%2 ) in %= 28 ;
               ie  = 15 + ( in<2 ? 1 + in : 2 + 
                            ( in<20 ? 1 + ( in - 2 )/2 : 9 +
                              ( in<26 ? 1 + ( in - 20 )/3 : 3 ) ) ) ;
               dp  = ( in<1 ? 3 :
                       ( in<2 ? 1 : 
                         ( in<20 ? 1 + ( in - 2 )%2 : 
                           ( in<26 ? 1 + ( in - 20 )%3 : 
                             ( 1 + ( in - 26 )%2 ) ) ) ) ) ;
            }
            else // barrel
            {
               iz  = ( di<kHBhalf ? 1 : -1 ) ;
               in %= kHBhalf ; 
               ip = in/18 + 1 ;
               in %= 18 ;
               if( in < 14 )
               {
                  dp = 1 ;
                  ie = in + 1 ;
               }
               else
               {
                  in %= 14 ;
                  dp =  1 + in%2 ;
                  ie = 15 + in/2 ;
               }
            }
         }
      }
      return HcalDetId( sd, iz*int(ie), ip, dp ) ;
   }
   else
   {
      return HcalDetId() ;
   }
}

int HcalDetId::hashed_index

(

)

const

Definition at line 118 of file HcalDetId.cc.

References depth(), HcalBarrel, HcalEndcap, HcalForward, HcalOuter, ietaAbs(), iphi(), kHBhalf, kHEhalf, kHFhalf, kHOhalf, subdet(), and zside().

Referenced by HcalRecHitsMaker::createVectorOfSubdetectorCells(), denseIndex(), HcalRecHitsMaker::init(), CalorimetryManager::reconstruct(), and CalorimetryManager::reconstructECAL().

{
   const HcalSubdetector sd ( subdet()  ) ;
   const int             ip ( iphi()    ) ;
   const int             ie ( ietaAbs() ) ;
   const int             dp ( depth()   ) ;
   const int             zn ( zside() < 0 ? 1 : 0 ) ;

   // HB valid DetIds: phi=1-72,eta=1-14,depth=1; phi=1-72,eta=15-16,depth=1-2
  
   // HE valid DetIds: phi=1-72,eta=16-17,depth=1; phi=1-72,eta=18-20,depth=1-2; 
   //                  phi=1-71(in steps of 2),eta=21-26,depth=1-2; phi=1-71(in steps of 2),eta=27-28,depth=1-3
   //                  phi=1-71(in steps of 2),eta=29,depth=1-2

   // HO valid DetIds: phi=1-72,eta=1-15,depth=4!

   // HF valid DetIds: phi=1-71(in steps of 2),eta=29-39,depth=1-2; phi=3-71(in steps of 4),eta=40-41,depth=1-2

   return ( ( sd == HcalBarrel ) ?
            ( ip - 1 )*18 + dp - 1 + ie - ( ie<16 ? 1 : 0 ) + zn*kHBhalf :
            ( ( sd == HcalEndcap ) ?
              2*kHBhalf + ( ip - 1 )*8 + ( ip/2 )*20 +
              ( ( ie==16 || ie==17 ) ? ie - 16 :
                ( ( ie>=18 && ie<=20 ) ? 2 + 2*( ie - 18 ) + dp - 1 :
                  ( ( ie>=21 && ie<=26 ) ? 8 + 2*( ie - 21 ) + dp - 1 :
                    ( ( ie>=27 && ie<=28 ) ? 20 + 3*( ie - 27 ) + dp - 1 :
                      26 + 2*( ie - 29 ) + dp - 1 ) ) ) ) + zn*kHEhalf :
              ( ( sd == HcalOuter ) ?
                2*kHBhalf + 2*kHEhalf + ( ip - 1 )*15 + ( ie - 1 ) + zn*kHOhalf :
                ( ( sd == HcalForward ) ?
                  2*kHBhalf + 2*kHEhalf + 2*kHOhalf + 
                  ( ( ip - 1 )/4 )*4 + ( ( ip - 1 )/2 )*22 + 
                  2*( ie - 29 ) + ( dp - 1 ) + zn*kHFhalf : -1 ) ) ) ) ; 
}

int HcalDetId::ieta

(

)

const [inline]

get the cell ieta

Definition at line 39 of file HcalDetId.h.

References ietaAbs(), and zside().

Referenced by HcaluLUTTPGCoder::adc2Linear(), HFLightCalRand::analyze(), HCALRecHitAnalyzer::analyze(), SinglePionEfficiencyNew::analyze(), HFLightCal::analyze(), JetToDigiDump::analyze(), cms::HcalConstantsASCIIWriter::analyze(), cms::Analyzer_minbias::analyze(), HFPreLightCal::analyze(), crystal_ieta_high(), crystal_ieta_low(), HcalMTCCMonitor::dumpDigi(), CaloGeometryHelper::getClosestCell(), hpdId(), HcalTopology::incrementDepth(), DetIdInfo::info(), HcalText2DetIdConverter::init(), JetAnalyzer::MakeCellListFromCaloTowers(), HFClusterAlgo::makeCluster(), TrackDetMatchInfo::nXnEnergy(), HcalLaserMonitor::perChanHists(), HcalLEDMonitor::perChanHists(), HcalTemplateAnalysis::processEvent(), HcalDigiMonitor::processEvent(), HcalTrigPrimMonitor::processEvent(), HcalLEDMonitor::processEvent(), HcalBeamMonitor::processEvent(), HcalMTCCMonitor::processEvent(), HcalPedestalMonitor::processEvent(), HcalExpertMonitor::processEvent_Digi(), HcalDeadCellMonitor::processEvent_digi(), HcalHotCellMonitor::processEvent_pedestal(), AlCaHOCalibProducer::produce(), HcalTrigTowerGeometry::towerIds(), CaloTowerConstituentsMap::towerOf(), and HcalUnpacker::unpack().

{ return zside()*ietaAbs(); }

int HcalDetId::ietaAbs

(

)

const [inline]

get the absolute value of the cell ieta

Definition at line 37 of file HcalDetId.h.

References DetId::id_.

Referenced by CaloRecHitCandidateProducer::cellTresholdAndWeight(), CaloGeometryHelper::getClosestCell(), CaloTowersCreationAlgo::getThresholdAndWeight(), hashed_index(), HcalGenericDetId::hashedId(), ieta(), HcalTopology::incrementDepth(), HcalHardcodeGeometryLoader::makeCell(), HFClusterAlgo::makeCluster(), HcalCableMapper::process(), HcalSimParameters::samplingFactor(), HcalTrigTowerGeometry::towerIds(), and CaloTowerConstituentsMap::towerOf().

{ return (id_>>7)&0x3f; }

int HcalDetId::iphi

(

)

const [inline]

get the cell iphi

Definition at line 41 of file HcalDetId.h.

References DetId::id_.

Referenced by HcaluLUTTPGCoder::adc2Linear(), HFLightCalRand::analyze(), HCALRecHitAnalyzer::analyze(), HFLightCal::analyze(), JetToDigiDump::analyze(), cms::HcalConstantsASCIIWriter::analyze(), cms::Analyzer_minbias::analyze(), HFPreLightCal::analyze(), crystal_iphi_high(), crystal_iphi_low(), HcalMTCCMonitor::dumpDigi(), CaloGeometryHelper::getClosestCell(), hashed_index(), HcalGenericDetId::hashedId(), hpdId(), HcalTopology::incrementDepth(), DetIdInfo::info(), HcalText2DetIdConverter::init(), HcalHardcodeGeometryLoader::makeCell(), JetAnalyzer::MakeCellListFromCaloTowers(), HFClusterAlgo::makeCluster(), TrackDetMatchInfo::nXnEnergy(), HcalLaserMonitor::perChanHists(), HcalLEDMonitor::perChanHists(), HcalCableMapper::process(), HcalTemplateAnalysis::processEvent(), HcalDigiMonitor::processEvent(), HcalTrigPrimMonitor::processEvent(), HcalLEDMonitor::processEvent(), HcalBeamMonitor::processEvent(), HcalMTCCMonitor::processEvent(), HcalPedestalMonitor::processEvent(), HcalExpertMonitor::processEvent_Digi(), HcalDeadCellMonitor::processEvent_digi(), HcalHotCellMonitor::processEvent_pedestal(), AlCaHOCalibProducer::produce(), HcalTrigTowerGeometry::towerIds(), CaloTowerConstituentsMap::towerOf(), and HcalUnpacker::unpack().

{ return id_&0x7F; }

HcalDetId & HcalDetId::operator=

(

const DetId &

id

)

Assignment from a generic cell id.

Definition at line 32 of file HcalDetId.cc.

References DetId::det(), Exception, DetId::Hcal, HcalBarrel, HcalEndcap, HcalForward, HcalOuter, DetId::id_, DetId::null(), DetId::rawId(), subdet(), and DetId::subdetId().

                                                {
  if (!gen.null()) {
    HcalSubdetector subdet=(HcalSubdetector(gen.subdetId()));
    if (gen.det()!=Hcal || 
        (subdet!=HcalBarrel && subdet!=HcalEndcap && 
         subdet!=HcalOuter && subdet!=HcalForward ))
      {
        throw cms::Exception("Invalid DetId") << "Cannot assign HcalDetId from " << std::hex << gen.rawId() << std::dec; 
      }  
  }
  id_=gen.rawId();
  return (*this);
}

HcalSubdetector HcalDetId::subdet

(

)

const [inline]

get the subdetector

Definition at line 33 of file HcalDetId.h.

References DetId::subdetId().

Referenced by HcaluLUTTPGCoder::adc2Linear(), HFLightCalRand::analyze(), HCALRecHitAnalyzer::analyze(), HFLightCal::analyze(), JetToDigiDump::analyze(), HFPreLightCal::analyze(), CaloTowersCreationAlgo::assignHit(), CaloRecHitCandidateProducer::cellTresholdAndWeight(), HcalDeadCellMonitor::createMaps(), HcalHotCellMonitor::createMaps(), JetAnalyzer::fillRecHitHists(), CaloTowersCreationAlgo::getThresholdAndWeight(), hashed_index(), HcalDetId(), hpdId(), HcalTopology::incrementDepth(), DetIdInfo::info(), HcalHardcodeGeometryLoader::makeCell(), HcalDDDGeometryLoader::makeCell(), JetAnalyzer::MakeCellListFromCaloTowers(), HcalRecHitsMaker::noiseInfCfromDB(), operator<<(), operator=(), HcalCableMapper::process(), HcalLaserMonitor::processEvent(), HcalDigiMonitor::processEvent(), HcalLEDMonitor::processEvent(), HcalPedestalMonitor::processEvent(), HcalMTCCMonitor::processEvent(), HcalExpertMonitor::processEvent_Digi(), HcalDeadCellMonitor::processEvent_digi(), HcalHotCellMonitor::processEvent_pedestal(), CaloTowersCreationAlgo::rescale(), HcalZSAlgoRealistic::shouldKeep(), HcalTBSimParameterMap::simParameters(), HcalSimParameterMap::simParameters(), HcalTrigTowerGeometry::towerIds(), and CaloTowerConstituentsMap::towerOf().

{ return (HcalSubdetector)(subdetId()); }

static bool HcalDetId::validDenseIndex

(

uint32_t

din

)

[inline, static]

Definition at line 63 of file HcalDetId.h.

References kSizeForDenseIndexing.

Referenced by detIdFromDenseIndex().

{ return ( din < kSizeForDenseIndexing ) ; }

bool HcalDetId::validDetId	(	HcalSubdetector	subdet,
		int	tower_ieta,
		int	tower_iphi,
		int	depth
	)			[static]

Definition at line 69 of file HcalDetId.cc.

References funct::abs(), HcalBarrel, HcalEndcap, HcalForward, and HcalOuter.

{
   const int ie ( abs( ies ) ) ;

   return ( ( ip >=  1         ) &&
            ( ip <= 72         ) &&
            ( dp >=  1         ) &&
            ( ie >=  1         ) &&
            ( ( ( sd == HcalBarrel ) &&
                ( ( ( ie <= 14         ) &&
                    ( dp ==  1         )    ) ||
                  ( ( ( ie == 15 ) || ( ie == 16 ) ) && 
                    ( dp <= 2          )                ) ) ) ||
              (  ( sd == HcalEndcap ) &&
                 ( ( ( ie == 16 ) &&
                     ( dp ==  3 )          ) ||
                   ( ( ie == 17 ) &&
                     ( dp ==  1 )          ) ||
                   ( ( ie >= 18 ) &&
                     ( ie <= 20 ) &&
                     ( dp <=  2 )          ) ||
                   ( ( ie >= 21 ) &&
                     ( ie <= 26 ) &&
                     ( dp <=  2 ) &&
                     ( ip%2 == 1 )         ) ||
                   ( ( ie >= 27 ) &&
                     ( ie <= 28 ) &&
                     ( dp <=  3 ) &&
                     ( ip%2 == 1 )         ) ||
                   ( ( ie == 29 ) &&
                     ( dp <=  2 ) &&
                     ( ip%2 == 1 )         )          )      ) ||
              (  ( sd == HcalOuter ) &&
                 ( ie <= 15 ) &&
                 ( dp ==  4 )           ) ||
              (  ( sd == HcalForward ) &&
                 ( dp <=  2 )          &&
                 ( ( ( ie >= 29 ) &&
                     ( ie <= 39 ) &&
                     ( ip%2 == 1 )    ) ||
                   ( ( ie >= 40 ) &&
                     ( ie <= 41 ) &&
                     ( ip%4 == 3 )         )  ) ) ) ) ;
}

int HcalDetId::zside

(

)

const [inline]

get the z-side of the cell (1/-1)

Definition at line 35 of file HcalDetId.h.

References DetId::id_.

Referenced by crystal_ieta_high(), crystal_ieta_low(), hashed_index(), HcalGenericDetId::hashedId(), ieta(), HcalHardcodeGeometryLoader::makeCell(), HcalDDDGeometryLoader::makeCell(), HFClusterAlgo::makeCluster(), HcalTrigTowerGeometry::towerIds(), and CaloTowerConstituentsMap::towerOf().

{ return (id_&0x2000)?(1):(-1); }

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Member Data Documentation

const HcalDetId HcalDetId::Undefined [static]

Definition at line 67 of file HcalDetId.h.

Referenced by HcalText2DetIdConverter::init(), CastorText2DetIdConverter::init(), and CastorDbHardcode::makeHardcodeMap().

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

• DataFormats/HcalDetId/interface/HcalDetId.h
• DataFormats/HcalDetId/src/HcalDetId.cc

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