Hi Ruben,
Unfortunately you do not mention which version you are using.
This problem had been fixed on November 19 2001 and you should not see this
problem if you use the current PRO version 3.02/07
or the dev version 3.03
Rene Brun
Ruben Shahoian wrote:
>
> Hello,
> I have a question about the root IO: does the TTree supposed to read/write
> the object which is derived from fully abstract class?
>
> Here are details of my problem:
>
> I need to write/read using the TTree the TClonesArray of the
> object. One of the ancestor classes of this object is fully abstract.
> (provides some general data members/methods for derived classes)
>
> class NaTrack :
> public NaRecParticle {
> // ..
> virtual NaCluster1D* GetCluster(Int_t i) const=0; // !!!
> //this method is abstract, depends on derived track version
>
> protected:
> Int_t fNClusters; // Number of contributing clusters
> Int_t fClusters[kMaxClusters]; // Clusters Id's (in the station)
> //
> ClassDef(NaTrack,1) // NA60 Reconstructed Base Track Class
> };
>
> Surely, the derived class (NaPCMuon) which goes into the TClonesArray implements its
> virtual NaCluster1D* GetCluster(Int_t i).
>
> class NaPCMuon :
> public NaTrack
> {
> //....
> virtual NaCluster1D* GetCluster(Int_t i) const;
> //..
> };
>
> The following happens at IO stage:
> 1) When I write the tree, close it and read it back in the same root
> session, everything works well.
>
> 2) But if I quit and start new root
> session, I get seg.vol. reading the branch containing mentioned TClonesArray.
>
> Running with the .T and gDebug=1 gives:
> 1) in the same root session:
> ...
> ReadBufferClones, class:NaPCMuon, name=NaTrack, fType[0]=0, offset=0, TStreamerBase, bufpos=132, nc=2
> ReadBufferClones, class:NaTrack, name=NaRecParticle, fType[0]=0, offset=0, TStreamerBase, bufpos=132, nc=2
> ReadBufferClones, class:NaRecParticle, name=TObject, fType[0]=66, offset=0, TStreamerBase, bufpos=132, nc=2
> ReadBufferClones, class:NaRecParticle, name=fPXYZ, fType[1]=25, offset=12, TStreamerBasicType, bufpos=152, nc=2
> ....
> // !!!! This part corresponds to fully abstract ancestor:
> ReadBufferClones, class:NaTrack, name=fNClusters, fType[1]=3, offset=64, TStreamerBasicType, bufpos=250, nc=2
> ReadBufferClones, class:NaTrack, name=fClusters, fType[2]=23, offset=68, TStreamerBasicType, bufpos=258, nc=2
> // !!!!
> ...
> ReadBufferClones, class:NaPCMuon, name=fParsUncorr, fType[1]=25, offset=168, TStreamerBasicType, bufpos=450, nc=2
>
> Works fine!
>
> 2) If I read the tree in the new root session, it first rebuilds the TStreamerInfo:
>
> ====>Rebuilding TStreamerInfo for class: NaPCMuon, version: 1
>
> ====>Rebuilding TStreamerInfo for class: NaTrack, version: 1
>
> ====>Rebuilding TStreamerInfo for class: NaRecParticle, version: 1
>
> StreamerInfo for class: NaRecParticle, version=1
> BASE TObject offset= 0 type=66 Basic ROOT object
> Float_t fPXYZ[3] offset= 12 type=25 Px,Py,Pz of the Particle
> Float_t fVXYZ[3] offset= 24 type=25 x,y,z of the Particle beginning
> Float_t fMass offset= 36 type= 5 Imposed mass
> Float_t fPt offset= 40 type= 5 Particle Pt
> Float_t fYLab offset= 44 type= 5 Lab Rapidity
> Char_t fCharge offset= 48 type= 1 Particle charge
> Float_t fChi2 offset= 52 type= 5 Particle quality
> Int_t fNumber offset= 56 type= 3 Index in the Particles list
> Int_t fVertexId offset= 60 type= 3 Id of the vertex to which it is attached
> i= 0, TObject type= 66, offset= 0, len=1, method=0
> i= 1, fPXYZ type= 25, offset= 12, len=3, method=0
> i= 2, fVXYZ type= 25, offset= 24, len=3, method=0
> i= 3, fMass type= 5, offset= 36, len=1, method=0
> i= 4, fPt type= 5, offset= 40, len=1, method=0
> i= 5, fYLab type= 5, offset= 44, len=1, method=0
> i= 6, fCharge type= 1, offset= 48, len=1, method=0
> i= 7, fChi2 type= 5, offset= 52, len=1, method=0
> i= 8, fNumber type= 3, offset= 56, len=1, method=0
> i= 9, fVertexId type= 3, offset= 60, len=1, method=0
>
> StreamerInfo for class: NaTrack, version=1
> BASE NaRecParticle offset= 0 type= 0 NA60 Reconstructed Particle Class
> Int_t fNClusters offset=99999 type= 3 Number of contributing clusters !!!! Wrong offsets
> Int_t fClusters[24] offset=99999 type=23 Clusters Id's (in the station)
> i= 0, NaRecParticle type= 0, offset= 0, len=1, method=157383136
> i= 1, fNClusters type= 3, offset=99999, len=1, method=0
> i= 2, fClusters type= 23, offset=99999, len=24, method=0
>
> StreamerInfo for class: NaPCMuon, version=1
> BASE NaTrack offset= 0 type= 0 NA60 Track Class
> Float_t fParsUncorr[6] offset=168 type=25 ax,ay,bx,by,pfit,pcomp of Forward Space Track
> Int_t fSextantId offset=200 type= 3 Sextant ID
> Float_t fSlopErr2 offset=204 type= 5 RRR
> i= 0, NaTrack type= 0, offset= 0, len=1, method=157415504
> i= 1, fParsUncorr type= 25, offset=168, len=6, method=0
> i= 2, fSextantId type= 3, offset=200, len=1, method=0
> i= 3, fSlopErr2 type= 5, offset=204, len=1, method=0
> ReadBufferClones, class:NaPCMuon, name=NaTrack, fType[0]=0, offset=0, TStreamerBase, bufpos=132, nc=2
> ReadBufferClones, class:NaTrack, name=NaRecParticle, fType[0]=0, offset=0, TStreamerBase, bufpos=132, nc=2
> ReadBufferClones, class:NaRecParticle, name=TObject, fType[0]=66, offset=0, TStreamerBase, bufpos=132, nc=2
> ReadBufferClones, class:NaRecParticle, name=fPXYZ, fType[1]=25, offset=12, TStreamerBasicType, bufpos=152, nc=2
> ReadBufferClones, class:NaRecParticle, name=fVXYZ, fType[2]=25, offset=24, TStreamerBasicType, bufpos=176, nc=2
> ReadBufferClones, class:NaRecParticle, name=fMass, fType[3]=5, offset=36, TStreamerBasicType, bufpos=200, nc=2
> ReadBufferClones, class:NaRecParticle, name=fPt, fType[4]=5, offset=40, TStreamerBasicType, bufpos=208, nc=2
> ReadBufferClones, class:NaRecParticle, name=fYLab, fType[5]=5, offset=44, TStreamerBasicType, bufpos=216, nc=2
> ReadBufferClones, class:NaRecParticle, name=fCharge, fType[6]=1, offset=48, TStreamerBasicType, bufpos=224, nc=2
> ReadBufferClones, class:NaRecParticle, name=fChi2, fType[7]=5, offset=52, TStreamerBasicType, bufpos=226, nc=2
> ReadBufferClones, class:NaRecParticle, name=fNumber, fType[8]=3, offset=56, TStreamerBasicType, bufpos=234, nc=2
> ReadBufferClones, class:NaRecParticle, name=fVertexId, fType[9]=3, offset=60, TStreamerBasicType, bufpos=242, nc=2
> ReadBufferClones, class:NaTrack, name=fNClusters, fType[1]=3, offset=99999, TStreamerBasicType, bufpos=250, nc=2
>
> *** Break *** segmentation violation
> Root > Function readrec() busy flag cleared
>
> As one can see, all data members of the abstract class have offset = kMissing !
> The fact that it happens on when TStreamerInfo::BuildOld() methos is used makes
> me to think that this is a bug. Is that so?
>
> Best regards,
> Ruben
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