/cvmfs/atlas.cern.ch/repo/sw/ASG/AnalysisBase/2.4.31/MultiDraw/MultiDraw/Formula.h

#ifndef MULTI_DRAW_FORMULA_H
#define MULTI_DRAW_FORMULA_H

//          Copyright Nils Krumnack 2011 - 2012.
// Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file LICENSE_1_0.txt or copy at
//          http://www.boost.org/LICENSE_1_0.txt)

// Please feel free to contact me (krumnack@iastate.edu) for bug
// reports, feature suggestions, praise and complaints.





//protect
#include <MultiDraw/Global.h>

#include <string>
#include <Rtypes.h>

class TTree;
class TTreeFormula;
class TTreeFormulaManager;

namespace MD
{
  class Formula
  {
    //
    // public interface
    //

  public:
    void testInvariant () const;


  public:
    Formula ();


  public:
    Formula (const std::string& name, const std::string& formula, TTree *tree);


  public:
    ~Formula ();


  public:
    void reset (TTree *tree);


  public:
    const std::string& formula () const;


  public:
    bool valid () const;


  public:
    int ndim () const;


  public:
    std::size_t ndata () const;


  public:
    Double_t value (std::size_t data) const;



    //
    // private interface
    //

  private:
    std::string m_formula;

  private:
    std::string m_name;

  private:
    TTree *m_tree;

  private:
    TTreeFormula *m_form;

  private:
    TTreeFormulaManager *m_manager;

  private:
    int m_ndim;

  private:
    mutable Long64_t m_entry;

  private:
    mutable Int_t m_ndata;

  private:
    mutable std::vector<Double_t> m_cache;

  private:
    mutable std::vector<bool> m_read;


  private:
    Formula (const Formula& that);
    Formula& operator = (const Formula& that);
  };
}

#endif

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