TBranch

class TBranch : public TNamed

    public:

              TBranch TBranch()
              TBranch TBranch(const Text_t* name, void* address, const Text_t* leaflist, Int_t basketsize = 32000, Int_t compress = -1)
              TBranch TBranch(TBranch&)
         virtual void ~TBranch()
         virtual void Browse(TBrowser* b)
              TClass* Class()
         virtual void DropBaskets()
        virtual Int_t Fill()
                char* GetAddress()
             TBasket* GetBasket(Int_t basket)
               Seek_t GetBasketSeek(Int_t basket)
        virtual Int_t GetBasketSize()
        virtual Int_t GetCompressionLevel()
          TDirectory* GetDirectory()
       virtual Stat_t GetEntries()
        virtual Int_t GetEntry(Int_t entry = 0)
        virtual Int_t GetEntryExport(Int_t entry, TClonesArray* list, Int_t n)
                Int_t GetEntryNumber()
        virtual Int_t GetEntryOffsetLen()
                Int_t GetEvent(Int_t entry = 0)
               TFile* GetFile(Int_t mode = 0)
        const Text_t* GetFileName() const
               TLeaf* GetLeaf(Text_t* name)
           TObjArray* GetListOfBaskets()
           TObjArray* GetListOfBranches()
           TObjArray* GetListOfLeaves()
        virtual Int_t GetMaxBaskets()
        virtual Int_t GetNleaves()
                Int_t GetOffset()
                Int_t GetReadBasket()
                Int_t GetReadEntry()
        virtual Int_t GetRow(Int_t row)
       virtual Stat_t GetTotBytes()
               TTree* GetTree()
                Int_t GetWriteBasket()
       virtual Stat_t GetZipBytes()
      virtual TClass* IsA() const
               Bool_t IsAutoDelete()
       virtual Bool_t IsFolder()
         virtual void Print(Option_t* option)
         virtual void ReadBasket(TBuffer& b)
         virtual void Reset(Option_t* option)
         virtual void SetAddress(void* add)
         virtual void SetAutoDelete(Bool_t autodel = kTRUE)
         virtual void SetBasketSize(Int_t buffsize)
         virtual void SetCompressionLevel(Int_t level = 1)
         virtual void SetEntryOffsetLen(Int_t len)
         virtual void SetFile(const Text_t* filename)
         virtual void SetFile(TFile* file = 0)
         virtual void SetOffset(Int_t offset = 0)
         virtual void SetTree(TTree* tree)
         virtual void ShowMembers(TMemberInspector& insp, char* parent)
         virtual void Streamer(TBuffer& b)
         virtual void UpdateAddress()

  Data Members

    protected:

            Int_t fCompress        (=1 branch is compressed, 0 otherwise)
            Int_t fBasketSize      Initial Size of  Basket Buffer
            Int_t fEntryOffsetLen  Initial Length of fEntryOffset table in the basket buffers
            Int_t fMaxBaskets      Maximum number of Baskets so far
            Int_t fWriteBasket     Last basket number written
            Int_t fReadBasket      Current basket number when reading
            Int_t fReadEntry       Current entry number when reading
            Int_t fEntryNumber     Current entry number (last one filled in this branch)
            Int_t fOffset          Offset of this branch
            Int_t fNleaves         Number of leaves
           Stat_t fEntries         Number of entries
           Stat_t fTotBytes        Total number of bytes in all leaves before compression
           Stat_t fZipBytes        Total number of bytes in all leaves after compression
        TObjArray fBranches        List of Branches of this branch
        TObjArray fLeaves          List of leaves of this branch
        TObjArray fBaskets         List of baskets of this branch
            Int_t fNBasketRAM      Number of baskets in fBasketRAM
           Int_t* fBasketRAM       table of basket numbers in memory
           Int_t* fBasketEntry     Table of first entry in eack basket
          Seek_t* fBasketSeek      Addresses of baskets on file
           TTree* fTree            Pointer to Tree header
            char* fAddress         Address of 1st leaf (variable or object)
      TDirectory* fDirectory       Pointer to directory where this branch buffers are stored
          TString fFileName        Name of file where buffers are stored ("" if in same file as Tree header)

See also

TBranchClones, TBranchObject

Class Description

                                                                      
 A TTree is a list of TBranches                                       //                                                                      
                                                                      
 A TBranch supports:                                                  
   - The list of TLeaf describing this branch.                        
   - The list of TBasket (branch buffers).                            
                                                                      
       See TBranch structure in TTree.                                
                                                                      
 See also specialized branches:                                       
     TBranchObject in case the branch is one object                   
     TBranchClones in case the branch is an array of clone objects    

*-*-*-*-*-*Default constructor for Branch*-*-*-*-*-*-*-*-*-*
*-*        ===================================

*-*-*-*-*-*-*-*-*-*-*-*-*Create a Branch*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
*-*                =====================

       * address is the address of the first item of a structure
         or the address of a pointer to an object (see example).
       * leaflist is the concatenation of all the variable names and types
         separated by a colon character :
         The variable name and the variable type are separated by a slash (/).
         The variable type may be 0,1 or 2 characters. If no type is given,
         the type of the variable is assumed to be the same as the previous
         variable. If the first variable does not have a type, it is assumed
         of type F by default. The list of currently supported types is given below:
            - C : a character string terminated by the 0 character
            - B : an 8 bit signed integer (Char_t)
            - b : an 8 bit unsigned integer (UChar_t)
            - S : a 16 bit signed integer (Short_t)
            - s : a 16 bit unsigned integer (UShort_t)
            - I : a 32 bit signed integer (Int_t)
            - i : a 32 bit unsigned integer (UInt_t)
            - F : a 32 bit floating point (Float_t)
            - D : a 64 bit floating point (Double_t)

         By default, a variable will be copied to the buffer with the number of
         bytes specified in the type descriptor character. However, if the type
         consists of 2 characters, the second character is an integer that
         specifies the number of bytes to be used when copying the variable
         to the output buffer. Example:
             X         ; variable X, type Float_t
             Y/I       : variable Y, type Int_t
             Y/I2      ; variable Y, type Int_t converted to a 16 bits integer

   See an example of a Branch definition in the TTree constructor.

   Note that in case the data type is an object, this branch can contain
   only this object.

    Note that this function is invoked by TTree::Branch

*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*

*-*-*-*-*-*Default destructor for a Branch*-*-*-*-*-*-*-*-*-*-*-*
*-*        ===============================

 Browser interface.

   Loop on all branch baskets.  Drop all except readbasket

*-*-*-*-*-*-*-*Loop on all leaves of this branch to fill Basket buffer*-*-*
*-*            =======================================================

*-*-*-*-*Return pointer to basket basketnumber in this Branch*-*-*-*-*-*
*-*      ====================================================

*-*-*-*-*Return address of basket in the file*-*-*-*-*-*
*-*      ====================================

*-*-*-*-*-*Read all leaves of entry and return total number of bytes*-*-*
*-*        =========================================================

*-*-*-*-*-*Read all leaves of entry and return total number of bytes*-*-*
*-* export buffers to real objects in the TClonesArray list.
*-*

  Return pointer to the file where branch buffers reside

*-*-*-*-*-*Return pointer to the 1st Leaf named name in thisBranch-*-*-*-*-*
*-*        =======================================================

*-*-*-*-*Return all elements of one row unpacked in internal array fValues*-*
*-*      =================================================================

*-*-*-*-*Return TRUE if an existing object in a TBranchObject must be deleted
*-*      ==================================================

*-*-*-*-*Return TRUE if more than one leaf, FALSE otherwise*-*
*-*      ==================================================

*-*-*-*-*-*-*-*-*-*-*-*Print TBranch parameters*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
*-*                    ========================

*-*-*-*-*-*-*-*Loop on all leaves of this branch to read Basket buffer*-*-*
*-*            =======================================================

*-*-*-*-*-*-*-*Reset a Branch*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
*-*            ====================

    Existing buffers are deleted
    Entries, max and min are reset

*-*-*-*-*-*-*-*Set address of this branch*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
*-*            ====================

*-*-*-*-*-*-*-*Set the AutoDelete bit
*-*            ====================
 this bit is used by TBranchObject::ReadBasket to decide if an object
 referenced by a TBranchObject must be deleted or not before reading
 a new entry
 if autodel is kTRUE, this existing object will be deleted, a new object
    created by the default constructor, then object->Streamer
 if autodel is kFALSE, the existing object is not deleted. Root assumes
    that the user is taking care of deleting any internal object or array
    This can be done in Streamer itself.

  Set file where this branch writes/reads its buffers

  Set file where this branch writes/reads its buffers
  By default the branch buffers reside in the file where the Tree was created.
  Branches of the same Tree may be on different files.

  The Root file will be connected only when necessary.
  If called by TBranch::Fill (via TBasket::WriteFile), the file
  will be created with the option "recreate".
  If called by TBranch::GetEntry (via TBranch::GetBasket), the file
  will be open in read mode.

  To open a file in "update" mode, use TBranch::SetFile(TFile *file).

*-*-*-*-*-*-*-*-*Stream a class object*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
*-*              =========================================

Inline Functions

                char* GetAddress()
                Int_t GetBasketSize()
                Int_t GetCompressionLevel()
                Int_t GetEvent(Int_t entry = 0)
                Int_t GetEntryOffsetLen()
          TDirectory* GetDirectory()
        const Text_t* GetFileName() const
                Int_t GetOffset()
                Int_t GetReadBasket()
                Int_t GetReadEntry()
                Int_t GetWriteBasket()
               Stat_t GetTotBytes()
               Stat_t GetZipBytes()
                Int_t GetEntryNumber()
           TObjArray* GetListOfBaskets()
           TObjArray* GetListOfBranches()
           TObjArray* GetListOfLeaves()
                Int_t GetMaxBaskets()
                Int_t GetNleaves()
               Stat_t GetEntries()
               TTree* GetTree()
                 void SetBasketSize(Int_t buffsize)
                 void SetCompressionLevel(Int_t level = 1)
                 void SetEntryOffsetLen(Int_t len)
                 void SetOffset(Int_t offset = 0)
                 void SetTree(TTree* tree)
                 void UpdateAddress()
              TClass* Class()
              TClass* IsA() const
                 void ShowMembers(TMemberInspector& insp, char* parent)
              TBranch TBranch(TBranch&)