Calibration/facilities/include/facilities/Clock.h

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// $Id: Clock.h,v 1.1.1.1 2005/10/17 06:11:40 maqm Exp $
//
//  Original Author: Sawyer Gillespie
//                   hgillesp@u.washington.edu
//
 
#ifndef _H_CLOCK
#define _H_CLOCK 1
 
#if _MSC_VER >= 1000
#  pragma once
#endif // _MSC_VER >= 1000
 
// includes
#include <cmath>
 
// forward declarations
typedef double ClockWord;
 
// class Clock
//  This is a general class for representing a clock value in terms
//  of some integral number of counts (ie. CPU cycles).
//
class Clock {
public:
  Clock() : m_time( 0 ), m_freq( 2.E7 ) {}
 
  virtual ClockWord count( double t ) {
    m_time += t;
    return m_time;
  }
 
  virtual ClockWord count( unsigned int c ) {
    m_time += c * 1. / m_freq;
    return m_time;
  }
 
  virtual void reset() { m_time = 0; }
 
  double freq() const { return m_freq; }
 
  virtual unsigned int cycles() { return static_cast<unsigned>( ceil( m_time / m_freq ) ); }
 
  virtual double elapsed() { return m_time; }
 
private:
  ClockWord m_time; //  current elapsed time    in clock cycles
  double    m_freq; //  frequency in Hz
};
 
#endif