TSelector

class TSelector : public TObject

    public:

                          TSelector()
                          TSelector(const TSelector&)
                  virtual ~TSelector()
             virtual void Begin(TTree*)
           static TClass* Class()
      virtual const char* GetOption() const
           virtual TList* GetOutputList() const
        static TSelector* GetSelector(const char* filename)
            virtual Int_t GetStatus() const
             virtual void Init(TTree*)
          virtual TClass* IsA() const
            static Bool_t IsStandardDraw(const char* selec)
           virtual Bool_t Notify()
               TSelector& operator=(const TSelector&)
           virtual Bool_t Process(Long64_t)
           virtual Bool_t ProcessCut(Long64_t)
             virtual void ProcessFill(Long64_t)
             virtual void SetInputList(TList* input)
             virtual void SetObject(TObject* obj)
             virtual void SetOption(const char* option)
             virtual void SetStatus(Int_t status)
             virtual void ShowMembers(TMemberInspector& insp, char* parent)
             virtual void SlaveBegin(TTree*)
             virtual void SlaveTerminate()
             virtual void Streamer(TBuffer& b)
                     void StreamerNVirtual(TBuffer& b)
             virtual void Terminate()
              virtual int Version() const

Data Members

    protected:

               Int_t fStatus  selector status
             TString fOption  option given to TTree::Process
            TObject* fObject  current object if processing object (vs. TTree)
              TList* fInput   list of objects available during processing (on PROOF)
      TSelectorList* fOutput  list of objects created during processing (on PROOF)

Class Description

                                                                        
 A TSelector object is used by the TTree::Draw, TTree::Scan,            
  TTree::Loop, TTree::Process to navigate in a TTree and make           
  selections.                                                           
                                                                        
  The following members functions are called by the TTree functions.    
    Init:        Attach a new TTree during the loop                     
    Begin:       called everytime a loop on the tree(s) starts.         
                 a convenient place to create your histograms.          
                                                                        
    Notify():    This function is called at the first entry of a new    
                 tree in a chain.                                       
    ProcessCut:  called at the beginning of each entry to return a flag 
                 true if the entry must be analyzed.                    
    ProcessFill: called in the entry loop for all entries accepted      
                 by Select.                                             
    Terminate:   called at the end of a loop on a TTree.                
                 a convenient place to draw/fit your histograms.        
                                                                        

 Default selector ctor.

 Selector destructor.

   The code in filename is loaded (interpreted or compiled, see below)
   filename must contain a valid class implementation derived from TSelector,
   where TSelector has the following member functions:

     void TSelector::Init(TTree *t). Called every time a new TTree is attached.
     void TSelector::Begin(). This function is called before looping on the
          events in the Tree. The user can create his histograms in this function.

     Bool_t TSelector::Notify(). This function is called at the first entry
          of a new file in a chain.

     Bool_t TSelector::Process(Long64_t entry). This function is called
          to process an event. It is the user's responsability to read
          the corresponding entry in memory (may be just a partial read).
          Once the entry is in memory one can apply a selection and if the
          event is selected histograms can be filled. Processing stops
          when this function returns kFALSE. This function combines the
          next two functions in one, avoiding to have to maintain state
          in the class to communicate between these two funtions.
          See WARNING below about entry.
          This method is used by PROOF.
     Bool_t TSelector::ProcessCut(Long64_t entry). This function is called
          before processing entry. It is the user's responsability to read
          the corresponding entry in memory (may be just a partial read).
          The function returns kTRUE if the entry must be processed,
          kFALSE otherwise. See WARNING below about entry.
     void TSelector::ProcessFill(Long64_t entry). This function is called for
          all selected events. User fills histograms in this function.
           See WARNING below about entry.
     void TSelector::Terminate(). This function is called at the end of
          the loop on all events.

   WARNING when a selector is used with a TChain:
    in the Process, ProcessCut, ProcessFill function, you must use
    the pointer to the current Tree to call GetEntry(entry).
    entry is always the local entry number in the current tree.
    Assuming that fChain is the pointer to the TChain being processed,
    use fChain->GetTree()->GetEntry(entry);

   If filename is of the form file.C, the file will be interpreted.
   If filename is of the form file.C++, the file file.C will be compiled
      and dynamically loaded. The corresponding binary file and shared
      library will be deleted at the end of the function.
   If filename is of the form file.C+, the file file.C will be compiled
      and dynamically loaded. At next call, if file.C is older than file.o
      and file.so, the file.C is not compiled, only file.so is loaded.

   The static function returns a pointer to a TSelector object

 Find out if this is a standard selection used for Draw actions
 (either TSelectorDraw, TProofDraw or deriving from them).

Inline Functions

                int Version() const
               void Init(TTree*)
               void Begin(TTree*)
               void SlaveBegin(TTree*)
             Bool_t Notify()
        const char* GetOption() const
              Int_t GetStatus() const
             Bool_t ProcessCut(Long64_t)
               void ProcessFill(Long64_t)
             Bool_t Process(Long64_t)
               void SetOption(const char* option)
               void SetObject(TObject* obj)
               void SetInputList(TList* input)
               void SetStatus(Int_t status)
             TList* GetOutputList() const
               void SlaveTerminate()
               void Terminate()
            TClass* Class()
            TClass* IsA() const
               void ShowMembers(TMemberInspector& insp, char* parent)
               void Streamer(TBuffer& b)
               void StreamerNVirtual(TBuffer& b)
          TSelector TSelector(const TSelector&)
         TSelector& operator=(const TSelector&)