TSelector


class description - source file - inheritance tree

class TSelector : public TObject


    public:
TSelector TSelector() TSelector TSelector(TSelector&) virtual void ~TSelector() virtual void Begin(TTree*) static TClass* Class() virtual const char* GetOption() const static TSelector* GetSelector(const char* filename) virtual TClass* IsA() const virtual Bool_t Notify() virtual Bool_t ProcessCut(Int_t entry) virtual void ProcessFill(Int_t entry) virtual void SetOption(const char* option) virtual void ShowMembers(TMemberInspector& insp, char* parent) virtual void Streamer(TBuffer& b) void StreamerNVirtual(TBuffer& b) virtual void Terminate()

Data Members

private:
protected:
TString fOption option given to TTree::Process public:


See also

TSelectorCint

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.    
    Begin:       called everytime a loop on the tree starts.            
                 a convenient place to create your histograms.          
                                                                        
    Notify():    This function is called at the first entry of a new    
                 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.        
                                                                        


TSelector(): TObject()
 Default constructor for a Selector.

~TSelector()
 destructor for a Selector.

TSelector* GetSelector(const char *filename)
   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::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::ProcessCut(Int_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.
     void TSelector::ProcessFill(Int_t entry). This function is called for
          all selected events. User fills histograms in this function.
     void TSelector::Terminate(). This function is called at the end of
          the loop on all events.

   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



Inline Functions


               void Begin(TTree*)
             Bool_t Notify()
        const char* GetOption() const
             Bool_t ProcessCut(Int_t entry)
               void ProcessFill(Int_t entry)
               void SetOption(const char* option)
               void Terminate()
            TClass* Class()
            TClass* IsA() const
               void ShowMembers(TMemberInspector& insp, char* parent)
               void Streamer(TBuffer& b)
               void StreamerNVirtual(TBuffer& b)
          TSelector TSelector(TSelector&)


Author: Rene Brun 05/02/97
Last update: root/treeplayer:$Name: $:$Id: TSelector.cxx,v 1.6 2001/03/03 08:49:35 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *


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