// This class provides a device to measure the cpu-time.
// Times are reported in seconds.
// E. Mayoraz, August 95


#include "chrono.h"


#include <iomanip.h>
#include <sys/times.h> 



#ifndef CLK_TCK
	#define CLK_TCK _sys_conf(_SC_CLK_TCK)
#endif


chrono::chrono() {
  struct tms buf;
  times(&buf);
  starttime = laptime = (double)(buf.tms_utime)/CLK_TCK;
}

double chrono::time() const {
  struct tms buf;
  times(&buf);
  return (double)(buf.tms_utime)/CLK_TCK - starttime;
}

double chrono::lap() {
  struct tms buf;
  times(&buf);
  double thislap = (double)(buf.tms_utime)/CLK_TCK - laptime;
  laptime = (double)(buf.tms_utime)/CLK_TCK;
  return thislap;
}
  
ostream& operator << (ostream& s, const chrono& c) {
  struct tms buf;
  times(&buf);
  s << "--Lap time " << setw(10) << (double)(buf.tms_utime)/CLK_TCK - c.laptime 
	<< "    Total time " << setw(10) 
	<< (double)(buf.tms_utime)/CLK_TCK - c.starttime << endl << flush;
  return s;
}
  
void chrono::restart() {
  struct tms buf;
  times(&buf);
  starttime = laptime = (double)(buf.tms_utime)/CLK_TCK;
}