#ifndef _OWLPS_POSITIONING_POSUTIL_HH_
#define _OWLPS_POSITIONING_POSUTIL_HH_

class Measurement ;

#include <boost/tr1/unordered_map.hpp>

/// Utilitary class
class PosUtil
{
public:
  /// The speed of light, in m/s
  static const unsigned long LIGHT_SPEED = 299792458 ;

  /** @name Measurements */
  //@{
  /// Mutually completes two Measurement lists with missing APs
  static void complete_with_dummy_measurements(
    std::tr1::unordered_map<std::string, Measurement> &measurements1,
    std::tr1::unordered_map<std::string, Measurement> &measurements2) ;
  /// Computes the distance between two Measurement lists
  static float ss_square_distance(
    std::tr1::unordered_map<std::string, Measurement> &measurements1,
    std::tr1::unordered_map<std::string, Measurement> &measurements2) ;
  //@}

  /** @name Wi-Fi */
  //@{
  /// Converts a Wi-Fi channel to the corresponding frequency in Hz
  static unsigned long wifi_channel_to_hz(const unsigned long &channel) ;
  //@}
} ;

#endif // _OWLPS_POSITIONING_POSUTIL_HH_