Timer.h

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/**<!-------------------------------------------------------------------->
   @class  Timer
   @author Travis Fischer (fisch0920@gmail.com)
   @author Matthew Jacobs (jacobs.mh@gmail.com)
   @date   Fall 2008

   @brief
      Small utility timer
   
   @note
      Replaces the functionality of boost::timer which, at least on my primary 
   testing system (Fedora i686 Linux), yields drastically incorrect results...
   <!-------------------------------------------------------------------->**/

#ifndef TIMER_H_
#define TIMER_H_

#include <common/common.h>
#include <sys/time.h>

struct Timer {
   inline Timer() {
      reset();
   }
   
   inline void reset() {
      gettimeofday(&m_startTime, 0);
   }
   
   /// @returns elapsed time measured in seconds since last reset
   inline double elapsed() const {
      timeval current_time;
      gettimeofday(&current_time, 0);
      
      current_time.tv_sec  -= m_startTime.tv_sec;
      current_time.tv_usec -= m_startTime.tv_usec;
      
      return current_time.tv_sec + 
         double(current_time.tv_usec) / CLOCKS_PER_SEC;
   }
   
   private:
      timeval m_startTime;
};

#endif // TIMER_H_