RhodeCode

      return *this;

    }

    ///\e

    TimeStamp operator+(const TimeStamp &b) const

    {

      TimeStamp t(*this);

      return t+=b;

    }

    ///\e

    TimeStamp &operator-=(const TimeStamp &b)

    {

      utime-=b.utime;

      stime-=b.stime;

      cutime-=b.cutime;

      cstime-=b.cstime;

      rtime-=b.rtime;

      return *this;

    }

    ///\e

    TimeStamp operator-(const TimeStamp &b) const

    {

      TimeStamp t(*this);

      return t-=b;

    }

    ///\e

    TimeStamp &operator*=(double b)

    {

      utime*=b;

      stime*=b;

      cutime*=b;

      cstime*=b;

      rtime*=b;

      return *this;

    }

    ///\e

    TimeStamp operator*(double b) const

    {

      TimeStamp t(*this);

      return t*=b;

    }

    friend TimeStamp operator*(double b,const TimeStamp &t);

    ///\e

    TimeStamp &operator/=(double b)

    {

      utime/=b;

      stime/=b;

      cutime/=b;

      cstime/=b;

      rtime/=b;

      return *this;

    }

    ///\e

    TimeStamp operator/(double b) const

    {

      TimeStamp t(*this);

      return t/=b;

    }

    ///The time ellapsed since the last call of stamp()

    TimeStamp ellapsed() const

    {

      TimeStamp t(NULL);

      return t-*this;

    }

    friend std::ostream& operator<<(std::ostream& os,const TimeStamp &t);

    ///Gives back the user time of the process

    double userTime() const

    {

      return utime;

    }

    ///Gives back the system time of the process

    double systemTime() const

    {

      return stime;

    }

    ///Gives back the user time of the process' children

    ///\note On <tt>WIN32</tt> platform this value is not calculated.

    ///

    double cUserTime() const

    {

      return cutime;

    }

    ///Gives back the user time of the process' children

    ///\note On <tt>WIN32</tt> platform this value is not calculated.

    ///

    double cSystemTime() const

    {

      return cstime;

    }

    ///Gives back the real time

    double realTime() const {return rtime;}

  };

  {

    return t*b;

  }

  ///Prints the time counters

  ///Prints the time counters in the following form:

  ///

  /// <tt>u: XX.XXs s: XX.XXs cu: XX.XXs cs: XX.XXs real: XX.XXs</tt>

  ///

  /// where the values are the

  /// \li \c u: user cpu time,

  /// \li \c s: system cpu time,

  /// \li \c cu: user cpu time of children,

  /// \li \c cs: system cpu time of children,

  /// \li \c real: real time.

  /// \relates TimeStamp

  /// \note On <tt>WIN32</tt> platform the cummulative values are not

  /// calculated.

  inline std::ostream& operator<<(std::ostream& os,const TimeStamp &t)

  {

    os << "u: " << t.userTime() <<

      "s, s: " << t.systemTime() <<

      "s, cu: " << t.cUserTime() <<

      "s, cs: " << t.cSystemTime() <<

      "s, real: " << t.realTime() << "s";

    return os;

  }

  ///Class for measuring the cpu time and real time usage of the process

  ///Class for measuring the cpu time and real time usage of the process.

  ///It is quite easy-to-use, here is a short example.

  ///\code

  /// #include<lemon/time_measure.h>

  /// #include<iostream>

  ///

  /// int main()

  /// {

  ///

  ///   ...

  ///

  ///   Timer t;

  ///   doSomething();

  ///   std::cout << t << '\n';

  ///   t.restart();

  ///   doSomethingElse();

  ///   std::cout << t << '\n';

  ///

  ///   ...

  ///

  /// }

  ///\endcode

  ///

  ///The \ref Timer can also be \ref stop() "stopped" and

  ///\ref start() "started" again, so it is possible to compute collected

  ///running times.

  ///

  ///\warning Depending on the operation system and its actual configuration

  ///the time counters have a certain (10ms on a typical Linux system)

  ///granularity.

  ///Therefore this tool is not appropriate to measure very short times.

  ///Also, if you start and stop the timer very frequently, it could lead to

  ///distorted results.

  ///

  ///\note If you want to measure the running time of the execution of a certain

  ///function, consider the usage of \ref TimeReport instead.

  ///

  ///\sa TimeReport

  class Timer

  {

    int _running; //Timer is running iff _running>0; (_running>=0 always holds)

    TimeStamp start_time; //This is the relativ start-time if the timer

                          //is _running, the collected _running time otherwise.

    void _reset() {if(_running) start_time.stamp(); else start_time.reset();}

  public:

    ///Constructor.

    ///\param run indicates whether or not the timer starts immediately.

    ///

    Timer(bool run=true) :_running(run) {_reset();}

    ///\name Control the state of the timer

    ///Basically a Timer can be either running or stopped,

    ///but it provides a bit finer control on the execution.

    ///The \ref lemon::Timer "Timer" also counts the number of

    ///\ref lemon::Timer::start() "start()" executions, and it stops

    ///only after the same amount (or more) \ref lemon::Timer::stop()

    ///"stop()"s. This can be useful e.g. to compute the running time

    ///of recursive functions.

    ///@{

    ///Reset and stop the time counters