Logo ROOT   6.10/09
Reference Guide
TStreamerInfo.h
Go to the documentation of this file.
1 // @(#)root/io:$Id$
2 // Author: Rene Brun 12/10/2000
3 
4 /*************************************************************************
5  * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
6  * All rights reserved. *
7  * *
8  * For the licensing terms see $ROOTSYS/LICENSE. *
9  * For the list of contributors see $ROOTSYS/README/CREDITS. *
10  *************************************************************************/
11 
12 #ifndef ROOT_TStreamerInfo
13 #define ROOT_TStreamerInfo
14 
15 #include <atomic>
16 
17 #include "TVirtualStreamerInfo.h"
18 
19 #include "ThreadLocalStorage.h"
20 
22 
23 /**
24 \class TStreamerInfo
25 \ingroup IO
26 Describe Streamer information for one class version
27 */
28 
29 class TFile;
30 class TClass;
31 class TClonesArray;
32 class TDataMember;
33 class TMemberStreamer;
34 class TStreamerElement;
35 class TStreamerBasicType;
36 class TClassStreamer;
37 class TVirtualArray;
38 namespace ROOT { namespace Detail { class TCollectionProxyInfo; } }
39 namespace ROOT { class TSchemaRule; }
40 
41 namespace TStreamerInfoActions { class TActionSequence; }
42 
44 
45  class TCompInfo {
46  // Class used to cache information (see fComp)
47  private:
48  // TCompInfo(const TCompInfo&) = default;
49  // TCompInfo& operator=(const TCompInfo&) = default;
50  public:
55  TStreamerElement *fElem; ///< Not Owned
57  TClass *fClass; ///< Not Owned
58  TClass *fNewClass; ///< Not Owned
60  TMemberStreamer *fStreamer; ///< Not Owned
61  TCompInfo() : fType(-1), fNewType(0), fOffset(0), fLength(0), fElem(0), fMethod(0),
62  fClass(0), fNewClass(0), fClassName(), fStreamer(0) {};
63  ~TCompInfo() {};
64  void Update(const TClass *oldcl, TClass *newcl);
65  };
67 
68 public:
69  // make the opaque pointer public.
71 
72 protected:
73  //---------------------------------------------------------------------------
74  // Adapter class used to handle streaming collection of pointers
75  //---------------------------------------------------------------------------
77  {
78  public:
80  fProxy( proxy ) {}
81 
82  char* operator[]( UInt_t idx ) const
83  {
84  char **el = (char**)fProxy->At(idx);
85  return *el;
86  }
87  private:
89  };
90 
91 private:
92  UInt_t fCheckSum; ///<Checksum of original class
93  Int_t fClassVersion; ///<Class version identifier
94  Int_t fOnFileClassVersion;///<!Class version identifier as stored on file.
95  Int_t fNumber; ///<!Unique identifier
96  Int_t fSize; ///<!size of the persistent class
97  Int_t fNdata; ///<!number of optimized elements
98  Int_t fNfulldata; ///<!number of elements
99  Int_t fNslots; ///<!total numbrer of slots in fComp.
100  TCompInfo *fComp; ///<![fNslots with less than fElements->GetEntries()*1.5 used] Compiled info
101  TCompInfo **fCompOpt; ///<![fNdata]
102  TCompInfo **fCompFull; ///<![fElements->GetEntries()]
103  TClass *fClass; ///<!pointer to class
104  TObjArray *fElements; ///<Array of TStreamerElements
105  Version_t fOldVersion; ///<! Version of the TStreamerInfo object read from the file
106  Int_t fNVirtualInfoLoc; ///<! Number of virtual info location to update.
107  ULong_t *fVirtualInfoLoc; ///<![fNVirtualInfoLoc] Location of the pointer to the TStreamerInfo inside the object (when emulated)
108  std::atomic<ULong_t> fLiveCount; ///<! Number of outstanding pointer to this StreamerInfo.
109  TStreamerInfoActions::TActionSequence *fReadObjectWise; ///<! List of read action resulting from the compilation.
110  TStreamerInfoActions::TActionSequence *fReadMemberWise; ///<! List of read action resulting from the compilation for use in member wise streaming.
111  TStreamerInfoActions::TActionSequence *fReadMemberWiseVecPtr; ///<! List of read action resulting from the compilation for use in member wise streaming.
112  TStreamerInfoActions::TActionSequence *fWriteObjectWise; ///<! List of write action resulting from the compilation.
113  TStreamerInfoActions::TActionSequence *fWriteMemberWise; ///<! List of write action resulting from the compilation for use in member wise streaming.
114  TStreamerInfoActions::TActionSequence *fWriteMemberWiseVecPtr; ///<! List of write action resulting from the compilation for use in member wise streaming.
115 
116  static std::atomic<Int_t> fgCount; ///<Number of TStreamerInfo instances
117 
118  template <typename T> static T GetTypedValueAux(Int_t type, void *ladd, int k, Int_t len);
119  static void PrintValueAux(char *ladd, Int_t atype, TStreamerElement * aElement, Int_t aleng, Int_t *count);
120 
121  UInt_t GenerateIncludes(FILE *fp, char *inclist, const TList *extrainfos);
122  void GenerateDeclaration(FILE *fp, FILE *sfp, const TList *subClasses, Bool_t top = kTRUE);
123  void InsertArtificialElements(std::vector<const ROOT::TSchemaRule*> &rules);
124  void DestructorImpl(void* p, Bool_t dtorOnly);
125 
126 private:
127  TStreamerInfo(const TStreamerInfo&); // TStreamerInfo are copiable. Not Implemented.
128  TStreamerInfo& operator=(const TStreamerInfo&); // TStreamerInfo are copiable. Not Implemented.
129  void AddReadAction(TStreamerInfoActions::TActionSequence *readSequence, Int_t index, TCompInfo *compinfo);
130  void AddWriteAction(TStreamerInfoActions::TActionSequence *writeSequence, Int_t index, TCompInfo *compinfo);
131  void AddReadMemberWiseVecPtrAction(TStreamerInfoActions::TActionSequence *readSequence, Int_t index, TCompInfo *compinfo);
132  void AddWriteMemberWiseVecPtrAction(TStreamerInfoActions::TActionSequence *writeSequence, Int_t index, TCompInfo *compinfo);
133 
134 public:
135 
136  /// Status bits
137  enum { kCannotOptimize = BIT(12),
138  kIgnoreTObjectStreamer = BIT(13), ///< Eventhough BIT(13) is taken up by TObject (to preserverse forward compatibility)
139  kRecovered = BIT(14),
140  kNeedCheck = BIT(15),
142  kBuildOldUsed = BIT(17)
143  };
144 
145 /// EReadWrite Enumerator
146 /// | Enum Constant | Description |
147 /// |----------|--------------------|
148 /// | kBase | Base class element |
149 /// | kOffsetL | Fixed size array |
150 /// | kOffsetP | Pointer to object |
151 /// | kCounter | Counter for array size |
152 /// | kCharStar| Pointer to array of char |
153 /// | kLegacyChar | Equal to TDataType's kchar |
154 /// | kBits | TObject::fBits in case of a referenced object |
155 /// | kObject | Class derived from TObject, or for TStreamerSTL::fCtype non-pointer elements |
156 /// | kObjectp | Class* derived from TObject and with comment field //->Class, or for TStreamerSTL::fCtype: pointer elements |
157 /// | kObjectP | Class* derived from TObject and with NO comment field //->Class |
158 /// | kAny | Class not derived from TObject |
159 /// | kAnyp | Class* not derived from TObject with comment field //->Class |
160 /// | kAnyP | Class* not derived from TObject with NO comment field //->Class |
161 /// | kAnyPnoVT | Class* not derived from TObject with NO comment field //->Class and Class has NO virtual table |
162 /// | kSTLp | Pointer to STL container |
163 /// | kTString | TString, special case |
164 /// | kTObject | TObject, special case |
165 /// | kTNamed | TNamed , special case |
166 /// | kCache | Cache the value in memory than is not part of the object but is accessible via a SchemaRule |
167  enum EReadWrite {
168  kBase = 0, kOffsetL = 20, kOffsetP = 40, kCounter = 6, kCharStar = 7,
169  kChar = 1, kShort = 2, kInt = 3, kLong = 4, kFloat = 5,
170  kDouble = 8, kDouble32= 9,
171  kLegacyChar = 10, /// Equal to TDataType's kchar
172  kUChar = 11, kUShort = 12, kUInt = 13, kULong = 14, kBits = 15,
173  kLong64 = 16, kULong64 = 17, kBool = 18, kFloat16 = 19,
174  kObject = 61, kAny = 62, kObjectp = 63, kObjectP = 64, kTString = 65,
175  kTObject = 66, kTNamed = 67, kAnyp = 68, kAnyP = 69, kAnyPnoVT = 70,
176  kSTLp = 71,
177  kSkip = 100, kSkipL = 120, kSkipP = 140,
178  kConv = 200, kConvL = 220, kConvP = 240,
179  kSTL = 300, kSTLstring = 365,
180  kStreamer = 500, kStreamLoop = 501,
181  kCache = 600, /// Cache the value in memory than is not part of the object but is accessible via a SchemaRule
182  kArtificial = 1000,
183  kCacheNew = 1001,
184  kCacheDelete = 1002,
185  kNeedObjectForVirtualBaseClass = 99997,
186  kMissing = 99999
187  };
188 
189  TStreamerInfo();
190  TStreamerInfo(TClass *cl);
191  virtual ~TStreamerInfo();
192  void Build();
193  void BuildCheck(TFile *file = 0);
194  void BuildEmulated(TFile *file);
195  void BuildOld();
196  virtual Bool_t BuildFor( const TClass *cl );
197  void CallShowMembers(const void* obj, TMemberInspector &insp, Bool_t isTransient) const;
198  void Clear(Option_t *);
199  TObject *Clone(const char *newname = "") const;
200  Bool_t CompareContent(TClass *cl,TVirtualStreamerInfo *info, Bool_t warn, Bool_t complete, TFile *file);
201  void Compile();
202  void ComputeSize();
203  void ForceWriteInfo(TFile *file, Bool_t force=kFALSE);
204  Int_t GenerateHeaderFile(const char *dirname, const TList *subClasses = 0, const TList *extrainfos = 0);
205  TClass *GetActualClass(const void *obj) const;
206  TClass *GetClass() const {return fClass;}
207  UInt_t GetCheckSum() const {return fCheckSum;}
208  UInt_t GetCheckSum(TClass::ECheckSum code) const;
209  Int_t GetClassVersion() const {return fClassVersion;}
210  Int_t GetDataMemberOffset(TDataMember *dm, TMemberStreamer *&streamer) const;
211  TObjArray *GetElements() const {return fElements;}
212  TStreamerElement *GetElem(Int_t id) const {return fComp[id].fElem;} // Return the element for the list of optimized elements (max GetNdata())
213  TStreamerElement *GetElement(Int_t id) const {return (TStreamerElement*)fElements->At(id);} // Return the element for the complete list of elements (max GetElements()->GetEntries())
214  Int_t GetElementOffset(Int_t id) const {return fCompFull[id]->fOffset;}
215  TStreamerInfoActions::TActionSequence *GetReadMemberWiseActions(Bool_t forCollection) { return forCollection ? fReadMemberWiseVecPtr : fReadMemberWise; }
217  TStreamerInfoActions::TActionSequence *GetWriteMemberWiseActions(Bool_t forCollection) { return forCollection ? fWriteMemberWiseVecPtr : fWriteMemberWise; }
219  Int_t GetNdata() const {return fNdata;}
220  Int_t GetNelement() const { return fElements->GetEntries(); }
221  Int_t GetNumber() const {return fNumber;}
222  Int_t GetLength(Int_t id) const {return fComp[id].fLength;}
223  ULong_t GetMethod(Int_t id) const {return fComp[id].fMethod;}
224  Int_t GetNewType(Int_t id) const {return fComp[id].fNewType;}
225  Int_t GetOffset(const char *) const;
226  Int_t GetOffset(Int_t id) const {return fComp[id].fOffset;}
227  Version_t GetOldVersion() const {return fOldVersion;}
228  Int_t GetOnFileClassVersion() const {return fOnFileClassVersion;}
229  Int_t GetSize() const;
230  Int_t GetSizeElements() const;
231  TStreamerElement *GetStreamerElement(const char*datamember, Int_t& offset) const;
232  TStreamerElement *GetStreamerElementReal(Int_t i, Int_t j) const;
233  Int_t GetType(Int_t id) const {return fComp[id].fType;}
234  template <typename T> T GetTypedValue(char *pointer, Int_t i, Int_t j, Int_t len) const;
235  template <typename T> T GetTypedValueClones(TClonesArray *clones, Int_t i, Int_t j, Int_t k, Int_t eoffset) const;
236  template <typename T> T GetTypedValueSTL(TVirtualCollectionProxy *cont, Int_t i, Int_t j, Int_t k, Int_t eoffset) const;
237  template <typename T> T GetTypedValueSTLP(TVirtualCollectionProxy *cont, Int_t i, Int_t j, Int_t k, Int_t eoffset) const;
238  Double_t GetValue(char *pointer, Int_t i, Int_t j, Int_t len) const { return GetTypedValue<Double_t>(pointer, i, j, len); }
239  Double_t GetValueClones(TClonesArray *clones, Int_t i, Int_t j, Int_t k, Int_t eoffset) const { return GetTypedValueClones<Double_t>(clones, i, j, k, eoffset); }
240  Double_t GetValueSTL(TVirtualCollectionProxy *cont, Int_t i, Int_t j, Int_t k, Int_t eoffset) const { return GetTypedValueSTL<Double_t>(cont, i, j, k, eoffset); }
241  Double_t GetValueSTLP(TVirtualCollectionProxy *cont, Int_t i, Int_t j, Int_t k, Int_t eoffset) const { return GetTypedValueSTLP<Double_t>(cont, i, j, k, eoffset); }
242  void ls(Option_t *option="") const;
243  Bool_t MatchLegacyCheckSum(UInt_t checksum) const;
245  void *New(void *obj = 0);
246  void *NewArray(Long_t nElements, void* ary = 0);
247  void Destructor(void* p, Bool_t dtorOnly = kFALSE);
248  void DeleteArray(void* p, Bool_t dtorOnly = kFALSE);
249  void PrintValue(const char *name, char *pointer, Int_t i, Int_t len, Int_t lenmax=1000) const;
250  void PrintValueClones(const char *name, TClonesArray *clones, Int_t i, Int_t eoffset, Int_t lenmax=1000) const;
251  void PrintValueSTL(const char *name, TVirtualCollectionProxy *cont, Int_t i, Int_t eoffset, Int_t lenmax=1000) const;
252 
253  template <class T>
254  Int_t ReadBuffer(TBuffer &b, const T &arrptr, TCompInfo *const*const compinfo, Int_t first, Int_t last, Int_t narr=1,Int_t eoffset=0,Int_t mode=0);
255  template <class T>
256  Int_t ReadBufferSkip(TBuffer &b, const T &arrptr, const TCompInfo *compinfo,Int_t kase, TStreamerElement *aElement, Int_t narr, Int_t eoffset);
257  template <class T>
258  Int_t ReadBufferConv(TBuffer &b, const T &arrptr, const TCompInfo *compinfo,Int_t kase, TStreamerElement *aElement, Int_t narr, Int_t eoffset);
259  template <class T>
260  Int_t ReadBufferArtificial(TBuffer &b, const T &arrptr, TStreamerElement *aElement, Int_t narr, Int_t eoffset);
261 
262  Int_t ReadBufferClones(TBuffer &b, TClonesArray *clones, Int_t nc, Int_t first, Int_t eoffset);
263  Int_t ReadBufferSTL(TBuffer &b, TVirtualCollectionProxy *cont, Int_t nc, Int_t eoffset, Bool_t v7 = kTRUE );
264  void SetCheckSum(UInt_t checksum) {fCheckSum = checksum;}
265  void SetClass(TClass *cl) {fClass = cl;}
266  void SetClassVersion(Int_t vers) {fClassVersion=vers;}
267  void SetOnFileClassVersion(Int_t vers) {fOnFileClassVersion=vers;}
268  void TagFile(TFile *fFile);
269 private:
270  // Try to remove those functions from the public interface.
271  Int_t WriteBuffer(TBuffer &b, char *pointer, Int_t first);
272  Int_t WriteBufferClones(TBuffer &b, TClonesArray *clones, Int_t nc, Int_t first, Int_t eoffset);
273  Int_t WriteBufferSTL (TBuffer &b, TVirtualCollectionProxy *cont, Int_t nc);
274  Int_t WriteBufferSTLPtrs( TBuffer &b, TVirtualCollectionProxy *cont, Int_t nc, Int_t first, Int_t eoffset);
275 public:
276  virtual void Update(const TClass *oldClass, TClass *newClass);
277 
278  virtual TVirtualCollectionProxy *GenEmulatedProxy(const char* class_name, Bool_t silent);
279  virtual TClassStreamer *GenEmulatedClassStreamer(const char* class_name, Bool_t silent);
280  virtual TVirtualCollectionProxy *GenExplicitProxy( const ::ROOT::Detail::TCollectionProxyInfo &info, TClass *cl );
281  virtual TClassStreamer *GenExplicitClassStreamer( const ::ROOT::Detail::TCollectionProxyInfo &info, TClass *cl );
282 
283  static TStreamerElement *GetCurrentElement();
284 
285 public:
286  // For access by the StreamerInfoActions.
287  template <class T>
288  Int_t WriteBufferAux (TBuffer &b, const T &arr, TCompInfo *const*const compinfo, Int_t first, Int_t last, Int_t narr,Int_t eoffset,Int_t mode);
289 
290  //WARNING this class version must be the same as TVirtualStreamerInfo
291  ClassDef(TStreamerInfo,9) //Streamer information for one class version
292 };
293 
294 
295 #endif
Describe Streamer information for one class version.
Definition: TStreamerInfo.h:43
TStreamerInfoActions::TActionSequence * GetWriteObjectWiseActions()
Int_t fClassVersion
Class version identifier.
Definition: TStreamerInfo.h:93
static std::atomic< Int_t > fgCount
Number of TStreamerInfo instances.
An array of TObjects.
Definition: TObjArray.h:37
TClass * fNewClass
Not Owned.
Definition: TStreamerInfo.h:58
Version_t fOldVersion
! Version of the TStreamerInfo object read from the file
char * operator[](UInt_t idx) const
Definition: TStreamerInfo.h:82
void SetCheckSum(UInt_t checksum)
TStreamerInfoActions::TActionSequence * fWriteMemberWiseVecPtr
! List of write action resulting from the compilation for use in member wise streaming.
Namespace for new ROOT classes and functions.
Definition: StringConv.hxx:21
short Version_t
Definition: RtypesCore.h:61
TStreamerElement * GetElem(Int_t id) const
Version_t GetOldVersion() const
const char Option_t
Definition: RtypesCore.h:62
All ROOT classes may have RTTI (run time type identification) support added.
Definition: TDataMember.h:31
double T(double x)
Definition: ChebyshevPol.h:34
T ReadBuffer(TBufferFile *buf)
One of the template functions used to read objects from messages.
Definition: MPSendRecv.h:157
TStreamerElement * GetElement(Int_t id) const
#define BIT(n)
Definition: Rtypes.h:75
A ROOT file is a suite of consecutive data records (TKey instances) with a well defined format...
Definition: TFile.h:46
Buffer base class used for serializing objects.
Definition: TBuffer.h:40
Basic string class.
Definition: TString.h:129
int Int_t
Definition: RtypesCore.h:41
bool Bool_t
Definition: RtypesCore.h:59
Int_t GetNelement() const
Double_t GetValueSTLP(TVirtualCollectionProxy *cont, Int_t i, Int_t j, Int_t k, Int_t eoffset) const
Int_t fNdata
!number of optimized elements
Definition: TStreamerInfo.h:97
ULong_t * fVirtualInfoLoc
![fNVirtualInfoLoc] Location of the pointer to the TStreamerInfo inside the object (when emulated) ...
Abstract base class for accessing the data-members of a class.
TObject * At(Int_t idx) const
Definition: TObjArray.h:165
TCompInfo ** fCompFull
![fElements->GetEntries()]
V GetOffset(E val1, E val2, V iso)
TStreamerInfoActions::TActionSequence * fReadMemberWise
! List of read action resulting from the compilation for use in member wise streaming.
Int_t fSize
!size of the persistent class
Definition: TStreamerInfo.h:96
TVirtualStreamerInfo * NewInfo(TClass *cl)
#define ClassDef(name, id)
Definition: Rtypes.h:297
ECheckSum
Definition: TClass.h:92
TMemberStreamer * fStreamer
Not Owned.
Definition: TStreamerInfo.h:60
Int_t fNfulldata
!number of elements
Definition: TStreamerInfo.h:98
TStreamerInfoActions::TActionSequence * fReadObjectWise
! List of read action resulting from the compilation.
void SetOnFileClassVersion(Int_t vers)
void SetClass(TClass *cl)
UInt_t fCheckSum
Checksum of original class.
Definition: TStreamerInfo.h:92
TCompInfo TCompInfo_t
Definition: TStreamerInfo.h:70
A doubly linked list.
Definition: TList.h:43
Int_t GetType(Int_t id) const
TCppType_t GetActualClass(TCppType_t klass, TCppObject_t obj)
Definition: Cppyy.cxx:207
TClass * fClass
!pointer to class
TObjArray * fElements
Array of TStreamerElements.
TVirtualCollectionProxy * fProxy
Definition: TStreamerInfo.h:88
TClass * GetClass() const
Wrapper around an object and giving indirect access to its content even if the object is not of a cla...
Definition: TVirtualArray.h:26
UInt_t GetCheckSum() const
TPointerCollectionAdapter(TVirtualCollectionProxy *proxy)
Definition: TStreamerInfo.h:79
Double_t GetValueClones(TClonesArray *clones, Int_t i, Int_t j, Int_t k, Int_t eoffset) const
Int_t fOnFileClassVersion
!Class version identifier as stored on file.
Definition: TStreamerInfo.h:94
ULong_t GetMethod(Int_t id) const
unsigned int UInt_t
Definition: RtypesCore.h:42
Double_t GetValueSTL(TVirtualCollectionProxy *cont, Int_t i, Int_t j, Int_t k, Int_t eoffset) const
The ROOT global object gROOT contains a list of all defined classes.
Definition: TClass.h:71
TStreamerInfoActions::TActionSequence * GetReadMemberWiseActions(Bool_t forCollection)
Int_t GetNdata() const
TClass * fClass
Not Owned.
Definition: TStreamerInfo.h:57
void SetClassVersion(Int_t vers)
Int_t GetElementOffset(Int_t id) const
TCompInfo * fComp
![fNslots with less than fElements->GetEntries()*1.5 used] Compiled info
TStreamerInfoActions::TActionSequence * fWriteMemberWise
! List of write action resulting from the compilation for use in member wise streaming.
const Bool_t kFALSE
Definition: RtypesCore.h:92
TStreamerElement * fElem
Not Owned.
Definition: TStreamerInfo.h:55
long Long_t
Definition: RtypesCore.h:50
double Double_t
Definition: RtypesCore.h:55
Int_t fNslots
!total numbrer of slots in fComp.
Definition: TStreamerInfo.h:99
TStreamerInfoActions::TActionSequence * fReadMemberWiseVecPtr
! List of read action resulting from the compilation for use in member wise streaming.
TStreamerInfoActions::TActionSequence * fWriteObjectWise
! List of write action resulting from the compilation.
int type
Definition: TGX11.cxx:120
unsigned long ULong_t
Definition: RtypesCore.h:51
Int_t fNVirtualInfoLoc
! Number of virtual info location to update.
Binding & operator=(OUT(*fun)(void))
Mother of all ROOT objects.
Definition: TObject.h:37
TObjArray * GetElements() const
Int_t GetClassVersion() const
Int_t GetOnFileClassVersion() const
An array of clone (identical) objects.
Definition: TClonesArray.h:32
Int_t fNumber
!Unique identifier
Definition: TStreamerInfo.h:95
Int_t GetOffset(Int_t id) const
Int_t GetNewType(Int_t id) const
Definition: file.py:1
you should not use this method at all Int_t Int_t Double_t Double_t Double_t Int_t Double_t Double_t Double_t Double_t b
Definition: TRolke.cxx:630
Int_t GetEntries() const
Return the number of objects in array (i.e.
Definition: TObjArray.cxx:494
TCompInfo ** fCompOpt
![fNdata]
Definition: first.py:1
Int_t GetLength(Int_t id) const
TStreamerInfoActions::TActionSequence * GetReadObjectWiseActions()
Abstract Interface class describing Streamer information for one class.
Int_t GetNumber() const
const Bool_t kTRUE
Definition: RtypesCore.h:91
Double_t GetValue(char *pointer, Int_t i, Int_t j, Int_t len) const
std::atomic< ULong_t > fLiveCount
! Number of outstanding pointer to this StreamerInfo.
TStreamerInfoActions::TActionSequence * GetWriteMemberWiseActions(Bool_t forCollection)