#ifndef StopWatch__
#define StopWatch__
/*** 
Example use of StopWatch

main()
{ int i, a=0;
  StopWatch w;
  w.start();
  ... first measured part
  w.lap("first part");
  ... second measured part
  w.lap("second part");
  ... third measured part
  w.lap("third part");
  ... fourth measured part
  w.stop();  // could be w.stop("fourth part");
} ***/

#include <iostream>
extern "C" {
#include <sys/time.h>
}
using namespace std;

class StopWatch {
 public:
  StopWatch(int laps = 20) 
  {
    next = 0;
    maxLaps = laps;
    name = new const char* [laps] ;
    times = new long long [laps];
  }

  void start(const char* msg = starting) // start the timer  
  { lap(msg); }

  void lap(const char* msg = 0, int printflag = 0) 
    // record an intermediate time
  { if (next < maxLaps )
    { times[next] = gethrvtime();
      name[next] = msg;
      next++; 
      if (printflag)
      display(printflag);
    } 
    else 
    { display();
      next = 0;
      lap(msg, printflag);
    }
  }

  void stop(const char* msg = stopping, int printflag = 2) // record a final time
  { lap(msg,printflag); }

  // this needs to be fixed up fancier
  void display(int printflag = 2, std::ostream& os = cout, double unit = .000000001)
  { 
    os << endl;
    os << "    Elapsed user time" << endl;
    os << endl;
    os.setf( ios::fixed, ios::floatfield );
    for (int j = (printflag == 1 ? next-1 : 1); j < next; j++) 
    { 
      os << "    " << (times[j]-times[j-1])*unit << " secs - " 
    	 << name[j] << endl;
    }
    if (next > 0 && printflag > 1)
    { os << "    " << "--------------------------" << endl;
      os << "    " << (times[next-1]-times[0])*unit << " secs - " 
	 << "Total time" << endl;
      os << endl;
    }
    os.unsetf( ios::fixed );
  }

 protected:
  long long * times;
  const char* * name;
  int next;
  int maxLaps;
  static const char* starting;// = "StopWatchStart";
  static const char* stopping;// = "StopWatchStop";
  
};

  const char* StopWatch::starting = "StopWatchStart";
  const char* StopWatch::stopping = "StopWatchStop";
#endif