Time.h

/********************************************************************************
Copyright (c) 2012, Francisco Claude and Rodrigo Canovas.
All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

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#ifndef SRC_BASIC_TIME_H_
#define SRC_BASIC_TIME_H_

//#include <libcds/libcds.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdint.h>
#include <cassert>
#include <iostream>
/** Timer class.
 */
class Timer {
  public:
    /** Creates and starts the timer.
     */
    Timer() {
      Restart();
    }

    /** Restarts the timer.
     */
    void Restart() {
      getrusage(RUSAGE_SELF, &ru);
      initial_ru = ru.ru_utime;
      gettimeofday(&initial, NULL);
    }

    /** Stops the timer.
     */
    void Stop() {
      getrusage(RUSAGE_SELF, &ru);
      final_ru = ru.ru_utime;
      gettimeofday(&final, NULL);
    }

    /** Computes the number of microsecond elapsed from start to stop
     * This time is for wall-clock time
     */
    double ElapsedTime() {
      return (final.tv_sec - initial.tv_sec) * 1000000 + (final.tv_usec - initial.tv_usec);
    }

    /** Computes the number of microsecond elapsed from start to stop
    * This time is for  process CPU usage
    */
    double ElapsedTimeCPU() {
      return (final_ru.tv_sec - initial_ru.tv_sec) * 1000000 + (final_ru.tv_usec - initial_ru.tv_usec);
    }

  protected:
    struct timeval initial, final;
    struct timeval initial_ru, final_ru;
    struct rusage ru;
};

#endif  // SRC_BASIC_TIME_H_