#ifndef __JTOOLS__JWEIGHT__
#define __JTOOLS__JWEIGHT__

#include <cmath>

#include "JLang/JTitle.hh"


/**
 * \author mdejong
 */

namespace JTOOLS {}
namespace JPP { using namespace JTOOLS; }

namespace JTOOLS {

  using JLANG::JTitle;
  
  /**
   * Weight calculator.
   */
  class JWeight :
    public JTitle
  {
  public:
    /**
     * Constructor.
     *
     * \param  title       title
     */
    JWeight(const JTitle& title  = "") :
      JTitle(title)
    {
      reset();
    }


    /**
     * Reset.
     */
    void reset() 
    {
      tot = 0.0;
      err = 0.0;
      num = 0;
    }
    
    
    /**
     * Put weight.
     *
     * \param  w           weight
     */
    void put(const double w) 
    {
      tot += w;
      err += w*w;
      num += 1;
    }
    

    /**
     * Get total count.
     *
     * \return             count
     */
    long long int getCount() const
    {
      return num;
    }
    

    /**
     * Get total weight.
     *
     * \return             weight
     */
    double getTotal() const
    {
      return tot;
    }
    

    /**
     * Get total error.
     *
     * \return             error
     */
    double getError() const
    {
      return sqrt(err);
    }
      
  protected:
    double tot;
    double err;
    long long int num;
  };
}  

#endif