TFormLeafInfo.h

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// @(#)root/treeplayer:$Id$
// Author: Philippe Canal 01/06/2004
 
/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers and al.        *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#ifndef ROOT_TFormLeafInfo
#define ROOT_TFormLeafInfo
 
#include "TObject.h"
 
#include "TLeafElement.h"
 
#include "TArrayI.h"
#include "TDataType.h"
#include "TStreamerInfo.h"
#include "TStreamerElement.h"
 
 
// declare the extra versions of GetValue() plus templated implementation
#define DECLARE_GETVAL(VIRTUAL, OVERRIDE) \
   VIRTUAL Double_t  GetValue(TLeaf *leaf, Int_t instance = 0) OVERRIDE               \
       { return GetValueImpl<Double_t>(leaf, instance); }                             \
   VIRTUAL Long64_t  GetValueLong64(TLeaf *leaf, Int_t instance = 0) OVERRIDE         \
       { return GetValueImpl<Long64_t>(leaf, instance); }                             \
   VIRTUAL LongDouble_t  GetValueLongDouble(TLeaf *leaf, Int_t instance = 0) OVERRIDE \
       { return GetValueImpl<LongDouble_t>(leaf, instance); }                         \
   template<typename T> T  GetValueImpl(TLeaf *leaf, Int_t instance = 0)   // no semicolon
 
 
// declare the extra versions of ReadValue() plus templated implementation
#define DECLARE_READVAL(VIRTUAL, OVERRIDE) \
   VIRTUAL Double_t ReadValue(char *where, Int_t instance = 0) OVERRIDE               \
       { return ReadValueImpl<Double_t>(where, instance); }                           \
   VIRTUAL Long64_t ReadValueLong64(char *where, Int_t instance = 0) OVERRIDE         \
       { return ReadValueImpl<Long64_t>(where, instance); }                           \
   VIRTUAL LongDouble_t ReadValueLongDouble(char *where, Int_t instance = 0) OVERRIDE \
       { return ReadValueImpl<LongDouble_t>(where, instance); }                       \
   template<typename T> T  ReadValueImpl(char *where, Int_t instance = 0)  // no semicolon
 
 
class TFormLeafInfo : public TObject {
public:
   // Constructors
   TFormLeafInfo(TClass* classptr = nullptr, Longptr_t offset = 0,
                 TStreamerElement* element = nullptr);
   TFormLeafInfo(const TFormLeafInfo& orig);
   virtual TFormLeafInfo* DeepCopy() const;
   ~TFormLeafInfo() override;
 
   void Swap(TFormLeafInfo &other);
   TFormLeafInfo &operator=(const TFormLeafInfo &orig);
 
   // Data Members
   TClass           *fClass;   ///<! This is the class of the data pointed to
   //TStreamerInfo  *fInfo;    ///<! == fClass->GetStreamerInfo()
   Longptr_t         fOffset;  ///<! Offset of the data pointed inside the class fClass
   TStreamerElement *fElement; ///<! Descriptor of the data pointed to.
         //Warning, the offset in fElement is NOT correct because it does not take into
         //account base classes and nested objects (which fOffset does).
   TFormLeafInfo    *fCounter;
   TFormLeafInfo    *fNext;    ///< follow this to grab the inside information
   TString fClassName;
   TString fElementName;
 
protected:
   Int_t fMultiplicity;
public:
 
   virtual void AddOffset(Int_t offset, TStreamerElement* element);
 
   virtual Int_t GetArrayLength();
   virtual TClass*   GetClass() const;
   virtual Int_t     GetCounterValue(TLeaf* leaf);
   virtual Int_t     ReadCounterValue(char *where);
 
   char* GetObjectAddress(TLeafElement* leaf, Int_t &instance);
 
   Int_t GetMultiplicity();
 
   // Currently only implemented in TFormLeafInfoCast
   Int_t GetNdata(TLeaf* leaf);
   virtual Int_t GetNdata();
 
   virtual void     *GetValuePointer(TLeaf *leaf, Int_t instance = 0);
   virtual void     *GetValuePointer(char  *from, Int_t instance = 0);
   virtual void     *GetLocalValuePointer(TLeaf *leaf, Int_t instance = 0);
   virtual void     *GetLocalValuePointer( char *from, Int_t instance = 0);
 
   virtual Bool_t    HasCounter() const;
   virtual Bool_t    IsString() const;
 
   virtual Bool_t    IsInteger() const;
   virtual Bool_t    IsReference() const  {  return kFALSE; }
 
   // Method for multiple variable dimensions.
   virtual Int_t GetPrimaryIndex();
   virtual Int_t GetVarDim();
   virtual Int_t GetVirtVarDim();
   virtual Int_t GetSize(Int_t index);
   virtual Int_t GetSumOfSizes();
   virtual void  LoadSizes(TBranch* branch);
   virtual void  SetPrimaryIndex(Int_t index);
   virtual void  SetSecondaryIndex(Int_t index);
   virtual void  SetSize(Int_t index, Int_t val);
   virtual void  SetBranch(TBranch* br)  { if ( fNext ) fNext->SetBranch(br); }
   virtual void  UpdateSizes(TArrayI *garr);
 
   virtual Bool_t    Update();
 
   DECLARE_GETVAL(virtual,);
   DECLARE_READVAL(virtual,);
 
   template <typename T> struct ReadValueHelper {
      static T Exec(TFormLeafInfo *leaf, char *where, Int_t instance) {
         return leaf->ReadValue(where, instance);
      }
   };
   template <typename T > T ReadTypedValue(char *where, Int_t instance = 0) {
      return ReadValueHelper<T>::Exec(this, where, instance);
   }
 
   template <typename T> struct GetValueHelper {
      static T Exec(TFormLeafInfo *linfo, TLeaf *leaf, Int_t instance) {
         return linfo->GetValue(leaf, instance);
      }
   };
   template <typename T > T GetTypedValue(TLeaf *leaf, Int_t instance = 0) {
      return GetValueHelper<T>::Exec(this, leaf, instance);
   }
};
 
 
template <> struct TFormLeafInfo::ReadValueHelper<Long64_t> {
   static Long64_t Exec(TFormLeafInfo *leaf, char *where, Int_t instance) { return leaf->ReadValueLong64(where, instance); }
};
template <> struct TFormLeafInfo::ReadValueHelper<ULong64_t> {
   static ULong64_t Exec(TFormLeafInfo *leaf, char *where, Int_t instance) { return (ULong64_t)leaf->ReadValueLong64(where, instance); }
};
template <> struct TFormLeafInfo::ReadValueHelper<LongDouble_t> {
   static LongDouble_t Exec(TFormLeafInfo *leaf, char *where, Int_t instance) { return leaf->ReadValueLongDouble(where, instance); }
};
 
template <> struct TFormLeafInfo::GetValueHelper<Long64_t> {
   static Long64_t Exec(TFormLeafInfo *linfo, TLeaf *leaf, Int_t instance) { return linfo->GetValueLong64(leaf, instance); }
};
template <> struct TFormLeafInfo::GetValueHelper<ULong64_t> {
   static ULong64_t Exec(TFormLeafInfo *linfo, TLeaf *leaf, Int_t instance) { return (ULong64_t)linfo->GetValueLong64(leaf, instance); }
};
template <> struct TFormLeafInfo::GetValueHelper<LongDouble_t> {
   static LongDouble_t Exec(TFormLeafInfo *linfo, TLeaf *leaf, Int_t instance) { return linfo->GetValueLongDouble(leaf, instance); }
};
 
// TFormLeafInfoDirect is a small helper class to implement reading a data
// member on an object stored in a TTree.
 
class TFormLeafInfoDirect : public TFormLeafInfo {
public:
   TFormLeafInfoDirect(TBranchElement * from);
   // The implicit default constructor's implementation is correct.
 
   TFormLeafInfo* DeepCopy() const override;
 
   DECLARE_GETVAL( , override);
   void     *GetLocalValuePointer(TLeaf *leaf, Int_t instance = 0) override;
   void     *GetLocalValuePointer(char *thisobj, Int_t instance = 0) override;
 
   Double_t  ReadValue(char * /*where*/, Int_t /*instance*/= 0) override;
   Long64_t  ReadValueLong64(char *where, Int_t i= 0) override { return ReadValue(where, i); }
   LongDouble_t  ReadValueLongDouble(char *where, Int_t i= 0) override { return ReadValue(where, i); }
 
};
 
// TFormLeafInfoNumerical is a small helper class to implement reading a
// numerical value inside a collection
 
class TFormLeafInfoNumerical : public TFormLeafInfo {
   EDataType fKind;
   Bool_t    fIsBool;
public:
   TFormLeafInfoNumerical(TVirtualCollectionProxy *holder_of);
   TFormLeafInfoNumerical(EDataType kind);
   TFormLeafInfoNumerical(const TFormLeafInfoNumerical& orig);
 
   TFormLeafInfo* DeepCopy() const override;
   void Swap(TFormLeafInfoNumerical &other);
   TFormLeafInfoNumerical &operator=(const TFormLeafInfoNumerical &orig);
 
   ~TFormLeafInfoNumerical() override;
 
   Bool_t    IsString() const override;
   Bool_t    Update() override;
};
 
// TFormLeafInfoCollectionObject
// This class is used when we are interested by the collection it self and
// it is split.
 
class TFormLeafInfoCollectionObject : public TFormLeafInfo {
   Bool_t fTop;  //If true, it indicates that the branch itself contains
public:
   TFormLeafInfoCollectionObject(TClass* classptr = nullptr, Bool_t fTop = kTRUE);
   TFormLeafInfoCollectionObject(const TFormLeafInfoCollectionObject &orig);
 
   void Swap(TFormLeafInfoCollectionObject &other);
   TFormLeafInfoCollectionObject &operator=(const TFormLeafInfoCollectionObject &orig);
 
   TFormLeafInfo* DeepCopy() const override {
      return new TFormLeafInfoCollectionObject(*this);
   }
 
   DECLARE_GETVAL( , override);
   Int_t     GetCounterValue(TLeaf* leaf) override;
   Double_t  ReadValue(char *where, Int_t instance = 0) override;
   Long64_t  ReadValueLong64(char *where, Int_t i= 0) override { return ReadValue(where, i); }
   LongDouble_t  ReadValueLongDouble(char *where, Int_t i= 0) override { return ReadValue(where, i); }
   void     *GetValuePointer(TLeaf *leaf, Int_t instance = 0) override;
   void     *GetValuePointer(char  *thisobj, Int_t instance = 0) override;
   void     *GetLocalValuePointer(TLeaf *leaf, Int_t instance = 0) override;
   void     *GetLocalValuePointer(char  *thisobj, Int_t instance = 0) override;
};
 
// TFormLeafInfoClones is a small helper class to implement reading a data
// member on a TClonesArray object stored in a TTree.
 
class TFormLeafInfoClones : public TFormLeafInfo {
   Bool_t fTop;  //If true, it indicates that the branch itself contains
public:
   //either the clonesArrays or something inside the clonesArray
   TFormLeafInfoClones(TClass* classptr = nullptr, Longptr_t offset = 0);
   TFormLeafInfoClones(TClass* classptr, Longptr_t offset, Bool_t top);
   TFormLeafInfoClones(TClass* classptr, Longptr_t offset, TStreamerElement* element,
                       Bool_t top = kFALSE);
   TFormLeafInfoClones(const TFormLeafInfoClones &orig);
 
   void Swap(TFormLeafInfoClones &other);
   TFormLeafInfoClones &operator=(const TFormLeafInfoClones &orig);
 
   TFormLeafInfo* DeepCopy() const override {
      return new TFormLeafInfoClones(*this);
   }
 
   DECLARE_GETVAL( , override);
   DECLARE_READVAL( , override);
   Int_t     GetCounterValue(TLeaf* leaf) override;
   Int_t     ReadCounterValue(char *where) override;
   void     *GetValuePointer(TLeaf *leaf, Int_t instance = 0) override;
   void     *GetValuePointer(char  *thisobj, Int_t instance = 0) override;
   void     *GetLocalValuePointer(TLeaf *leaf, Int_t instance = 0) override;
   void     *GetLocalValuePointer(char  *thisobj, Int_t instance = 0) override;
};
 
// TFormLeafInfoCollection is a small helper class to implement reading a data member
// on a generic collection object stored in a TTree.
 
class TFormLeafInfoCollection : public TFormLeafInfo {
   Bool_t fTop;  //If true, it indicates that the branch itself contains
   //either the clonesArrays or something inside the clonesArray
   TClass                  *fCollClass;
   TString                  fCollClassName;
   TVirtualCollectionProxy *fCollProxy;
   TStreamerElement        *fLocalElement;
public:
 
   TFormLeafInfoCollection(TClass* classptr,
                           Longptr_t offset,
                           TStreamerElement* element,
                           Bool_t top = kFALSE);
 
   TFormLeafInfoCollection(TClass* motherclassptr,
                           Longptr_t offset = 0,
                           TClass* elementclassptr = nullptr,
                           Bool_t top = kFALSE);
 
   TFormLeafInfoCollection();
   TFormLeafInfoCollection(const TFormLeafInfoCollection& orig);
 
   ~TFormLeafInfoCollection() override;
 
   void Swap(TFormLeafInfoCollection &other);
   TFormLeafInfoCollection &operator=(const TFormLeafInfoCollection &orig);
 
   TFormLeafInfo* DeepCopy() const override;
 
   Bool_t    Update() override;
 
   DECLARE_GETVAL( , override);
   DECLARE_READVAL( , override);
   Int_t     GetCounterValue(TLeaf* leaf) override;
   Int_t     ReadCounterValue(char* where) override;
   virtual Int_t     GetCounterValue(TLeaf* leaf, Int_t instance);
   Bool_t    HasCounter() const override;
   void     *GetValuePointer(TLeaf *leaf, Int_t instance = 0) override;
   void     *GetValuePointer(char  *thisobj, Int_t instance = 0) override;
   void     *GetLocalValuePointer(TLeaf *leaf, Int_t instance = 0) override;
   void     *GetLocalValuePointer(char  *thisobj, Int_t instance = 0) override;
};
 
// TFormLeafInfoCollectionSize is used to return the size of a collection
 
class TFormLeafInfoCollectionSize : public TFormLeafInfo {
   TClass                  *fCollClass;
   TString                  fCollClassName;
   TVirtualCollectionProxy *fCollProxy;
public:
   TFormLeafInfoCollectionSize(TClass*);
   TFormLeafInfoCollectionSize(TClass* classptr,Longptr_t offset,TStreamerElement* element);
   TFormLeafInfoCollectionSize();
   TFormLeafInfoCollectionSize(const TFormLeafInfoCollectionSize& orig);
 
   ~TFormLeafInfoCollectionSize() override;
 
   void Swap(TFormLeafInfoCollectionSize &other);
   TFormLeafInfoCollectionSize &operator=(const TFormLeafInfoCollectionSize &orig);
 
   TFormLeafInfo* DeepCopy() const override;
 
   Bool_t    Update() override;
 
   void     *GetValuePointer(TLeaf *leaf, Int_t instance = 0) override;
   void     *GetValuePointer(char  *from, Int_t instance = 0) override;
   void     *GetLocalValuePointer(TLeaf *leaf, Int_t instance = 0) override;
   void     *GetLocalValuePointer( char *from, Int_t instance = 0) override;
   Double_t  ReadValue(char *where, Int_t instance = 0) override;
   Long64_t  ReadValueLong64(char *where, Int_t i= 0) override { return ReadValue(where, i); }
   LongDouble_t  ReadValueLongDouble(char *where, Int_t i= 0) override { return ReadValue(where, i); }
};
 
// TFormLeafInfoPointer is a small helper class to implement reading a data
// member by following a pointer inside a branch of TTree.
 
class TFormLeafInfoPointer : public TFormLeafInfo {
public:
   TFormLeafInfoPointer(TClass* classptr = nullptr, Longptr_t offset = 0,
                        TStreamerElement* element = nullptr);
   // The default copy constructor is the right implementation.
 
   TFormLeafInfo* DeepCopy() const override;
 
   DECLARE_GETVAL( , override);
   DECLARE_READVAL( , override);
};
 
// TFormLeafInfoMethod is a small helper class to implement executing a method
// of an object stored in a TTree
 
class TFormLeafInfoMethod : public TFormLeafInfo {
 
   TMethodCall *fMethod;
   TString      fMethodName;
   TString      fParams;
   Double_t     fResult;
   TString      fCopyFormat;
   TString      fDeleteFormat;
   void        *fValuePointer;
   Bool_t       fIsByValue;
 
public:
   static TClass *ReturnTClass(TMethodCall *mc);
 
   TFormLeafInfoMethod(TClass* classptr = nullptr, TMethodCall *method = nullptr);
   TFormLeafInfoMethod(const TFormLeafInfoMethod& orig);
   ~TFormLeafInfoMethod() override;
 
   void Swap(TFormLeafInfoMethod &other);
   TFormLeafInfoMethod &operator=(const TFormLeafInfoMethod &orig);
 
   TFormLeafInfo* DeepCopy() const override;
 
   DECLARE_READVAL( , override);
   TClass*  GetClass() const override;
   void    *GetLocalValuePointer( TLeaf *from, Int_t instance = 0) override;
   void    *GetLocalValuePointer(char *from, Int_t instance = 0) override;
   Bool_t   IsInteger() const override;
   Bool_t   IsString() const override;
   Bool_t   Update() override;
};
 
// TFormLeafInfoMultiVarDim is a small helper class to implement reading a
// data member on a variable size array inside a TClonesArray object stored in
// a TTree.  This is the version used when the data member is inside a
// non-split object.
 
class TFormLeafInfoMultiVarDim : public TFormLeafInfo {
public:
   Int_t fNsize;
   TArrayI fSizes;           // Array of sizes of the variable dimension
   TFormLeafInfo *fCounter2; // Information on how to read the secondary dimensions
   Int_t fSumOfSizes;        // Sum of the content of fSizes
   Int_t fDim;               // physical number of the dimension that is variable
   Int_t fVirtDim;           // number of the virtual dimension to which this object correspond.
   Int_t fPrimaryIndex;      // Index of the dimensions that is indexing the second dimension's size
   Int_t fSecondaryIndex;    // Index of the second dimension
 
protected:
   TFormLeafInfoMultiVarDim(TClass* classptr, Longptr_t offset,
                            TStreamerElement* element) : TFormLeafInfo(classptr,offset,element),fNsize(0),fSizes(),fCounter2(nullptr),fSumOfSizes(0),fDim(0),fVirtDim(0),fPrimaryIndex(-1),fSecondaryIndex(-1) {}
 
public:
   TFormLeafInfoMultiVarDim(TClass* classptr, Longptr_t offset,
                            TStreamerElement* element, TFormLeafInfo* parent);
   TFormLeafInfoMultiVarDim();
   TFormLeafInfoMultiVarDim(const TFormLeafInfoMultiVarDim& orig);
   ~TFormLeafInfoMultiVarDim() override;
 
   void Swap(TFormLeafInfoMultiVarDim &other);
   TFormLeafInfoMultiVarDim &operator=(const TFormLeafInfoMultiVarDim &orig);
 
   TFormLeafInfo* DeepCopy() const override;
 
   /* The proper indexing and unwinding of index is done by prior leafinfo in the chain. */
   //virtual Double_t  ReadValue(char *where, Int_t instance = 0) {
   //   return TFormLeafInfo::ReadValue(where,instance);
   //}
 
   void     LoadSizes(TBranch* branch) override;
   Int_t    GetPrimaryIndex() override;
   void     SetPrimaryIndex(Int_t index) override;
   void     SetSecondaryIndex(Int_t index) override;
   void     SetSize(Int_t index, Int_t val) override;
   Int_t    GetSize(Int_t index) override;
   Int_t    GetSumOfSizes() override;
   Double_t GetValue(TLeaf * /*leaf*/, Int_t /*instance*/ = 0) override;
   Long64_t  GetValueLong64(TLeaf *leaf, Int_t i= 0) override { return GetValue(leaf, i); }
   LongDouble_t  GetValueLongDouble(TLeaf *leaf, Int_t i= 0) override { return GetValue(leaf, i); }
   Int_t    GetVarDim() override;
   Int_t    GetVirtVarDim() override;
   Bool_t   Update() override;
   void     UpdateSizes(TArrayI *garr) override;
};
 
// TFormLeafInfoMultiVarDimDirect is a small helper class to implement reading
// a data member on a variable size array inside a TClonesArray object stored
// in a TTree.  This is the version used for split access
 
class TFormLeafInfoMultiVarDimDirect : public TFormLeafInfoMultiVarDim {
public:
   // The default constructor are the correct implementation.
 
   TFormLeafInfo* DeepCopy() const override;
 
   DECLARE_GETVAL( , override);
   Double_t  ReadValue(char * /*where*/, Int_t /*instance*/ = 0) override;
   Long64_t  ReadValueLong64(char *where, Int_t i= 0) override { return ReadValue(where, i); }
   LongDouble_t  ReadValueLongDouble(char *where, Int_t i= 0) override { return ReadValue(where, i); }
};
 
// TFormLeafInfoMultiVarDimCollection is a small helper class to implement reading
// a data member which is a collection inside a TClonesArray or collection object
// stored in a TTree.  This is the version used for split access
//
class TFormLeafInfoMultiVarDimCollection : public TFormLeafInfoMultiVarDim {
public:
   TFormLeafInfoMultiVarDimCollection(TClass* motherclassptr, Longptr_t offset,
      TClass* elementclassptr, TFormLeafInfo *parent);
   TFormLeafInfoMultiVarDimCollection(TClass* classptr, Longptr_t offset,
      TStreamerElement* element, TFormLeafInfo* parent);
   // The default copy constructor is the right implementation.
 
   TFormLeafInfo* DeepCopy() const override;
 
   Int_t GetArrayLength() override { return 0; }
   void      LoadSizes(TBranch* branch) override;
   Double_t  GetValue(TLeaf *leaf, Int_t instance = 0) override;
   Long64_t  GetValueLong64(TLeaf *leaf, Int_t i= 0) override { return GetValue(leaf, i); }
   LongDouble_t  GetValueLongDouble(TLeaf *leaf, Int_t i= 0) override { return GetValue(leaf, i); }
   DECLARE_READVAL( , override);
};
 
// TFormLeafInfoMultiVarDimClones is a small helper class to implement reading
// a data member which is a TClonesArray inside a TClonesArray or collection object
// stored in a TTree.  This is the version used for split access
//
class TFormLeafInfoMultiVarDimClones : public TFormLeafInfoMultiVarDim {
public:
   TFormLeafInfoMultiVarDimClones(TClass* motherclassptr, Longptr_t offset,
      TClass* elementclassptr, TFormLeafInfo *parent);
   TFormLeafInfoMultiVarDimClones(TClass* classptr, Longptr_t offset,
      TStreamerElement* element, TFormLeafInfo* parent);
   // The default copy constructor is the right implementation.
 
   TFormLeafInfo* DeepCopy() const override;
 
   Int_t GetArrayLength() override { return 0; }
   void      LoadSizes(TBranch* branch) override;
   Double_t  GetValue(TLeaf *leaf, Int_t instance = 0) override;
   Long64_t  GetValueLong64(TLeaf *leaf, Int_t i= 0) override { return GetValue(leaf, i); }
   LongDouble_t  GetValueLongDouble(TLeaf *leaf, Int_t i= 0) override { return GetValue(leaf, i); }
   DECLARE_READVAL( , override);
};
 
// TFormLeafInfoCast is a small helper class to implement casting an object to
// a different type (equivalent to dynamic_cast)
 
class TFormLeafInfoCast : public TFormLeafInfo {
public:
   TClass *fCasted;     //! Pointer to the class we are trying to case to
   TString fCastedName; //! Name of the class we are casting to.
   Bool_t  fGoodCast;   //! Marked by ReadValue.
   Bool_t  fIsTObject;  //! Indicated whether the fClass inherits from TObject.
 
   TFormLeafInfoCast(TClass* classptr = nullptr, TClass* casted = nullptr);
   TFormLeafInfoCast(const TFormLeafInfoCast& orig);
   ~TFormLeafInfoCast() override;
 
   void Swap(TFormLeafInfoCast &other);
   TFormLeafInfoCast &operator=(const TFormLeafInfoCast &orig);
 
   TFormLeafInfo* DeepCopy() const override;
 
   DECLARE_READVAL( , override);
   // Currently only implemented in TFormLeafInfoCast
   Int_t GetNdata() override;
   Bool_t    Update() override;
};
 
// TFormLeafInfoTTree is a small helper class to implement reading
// from the containing TTree object itself.
 
class TFormLeafInfoTTree : public TFormLeafInfo {
   TTree   *fTree;
   TTree   *fCurrent;
   TString  fAlias;
 
public:
   TFormLeafInfoTTree(TTree *tree = nullptr, const char *alias = nullptr, TTree *current = nullptr);
   TFormLeafInfoTTree(const TFormLeafInfoTTree& orig);
 
   void Swap(TFormLeafInfoTTree &other);
   TFormLeafInfoTTree &operator=(const TFormLeafInfoTTree &orig);
 
   TFormLeafInfo* DeepCopy() const override;
 
   using TFormLeafInfo::GetLocalValuePointer;
   using TFormLeafInfo::GetValue;
 
   DECLARE_GETVAL( , override);
   DECLARE_READVAL( , override);
   void     *GetLocalValuePointer(TLeaf *leaf, Int_t instance = 0) override;
   Bool_t    Update() override;
};
 
 
#endif /* ROOT_TFormLeafInfo */