Copy of Timer.h

/*
    Timer.h
    Header file for Timer class.

    George J. Grevera, Ph.D., ggrevera@sju.edu, grevera@mipg.upenn.edu

    Copyright (C) 2002, George J. Grevera

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
    USA or from http://www.gnu.org/licenses/gpl.txt.

    This General Public License does not permit incorporating this
    code into proprietary programs.  (So a hypothetical company such
    as GH (Generally Hectic) should NOT incorporate this code into
    their proprietary programs.)
*/
#ifndef Timer_h
#define Timer_h
//----------------------------------------------------------------------
#include <iostream>
#include <stdio.h>
#include <time.h>

#ifndef WIN32
#  include <sys/time.h>
#endif

using namespace std;
//----------------------------------------------------------------------
class Timer {
  private:
    static long    indent;
    //for summary stats
    static double  best;
    static double  worst;
    static double  total;
    static long    count;

    #ifdef WIN32
        long            tc_start;
    #else
        struct timeval  tv_start;
    #endif
    char*  msg;
    bool   summary;

  public:
    inline Timer ( const bool summary=false ) {
        Timer( (char*)NULL, summary );
    }
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    inline Timer ( char* m, const bool summary=false ) {
        //init our "timer" to determine how long will this take.
        ++Timer::indent;
        this->msg = m;
        this->summary = summary;
        reset();
    }
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    inline void reset ( ) {
        #ifdef WIN32
            this->tc_start = GetTickCount();
        #else
            //hrtime_t hr_start = gethrtime();  //only on Solaris (not SGI)
            struct timezone tz_start;
            gettimeofday(&tv_start, &tz_start);
        #endif
    }
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    inline double getElapsedTime ( ) {
        #ifdef WIN32
            const long tc_end = GetTickCount();
            return ( (tc_end-this->tc_start)/1E3 );
        #else
            struct timeval  tv_end;
            struct timezone tz_end;
            gettimeofday(&tv_end, &tz_end);
            const double d_start = tv_start.tv_sec + (tv_start.tv_usec / 1E6);
            const double d_end   = tv_end.tv_sec   + (tv_end.tv_usec   / 1E6);
            return ( d_end-d_start );
        #endif
    }
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    inline void report ( ) {
        //report the elapsed time.
        //note: many timers may be active at any given time.
        for (int i=0; i<Timer::indent; i++)    cout << "  ";
        if (this->msg != NULL) {
            cout << this->msg << " time= " << getElapsedTime() << "s";
        } else {
            cout << "time= " << getElapsedTime() << "s";
        }

        if (this->summary) {
            cout << ", best=" << Timer::best << ", worst=" << Timer::worst
                 << ", average=" << (Timer::total/Timer::count);
        }

        cout << endl;
    }
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    inline ~Timer ( ) {
        const double t = getElapsedTime();
        if (this->summary) {
            Timer::total += t;
            ++Timer::count;
            if (t>Timer::worst)  Timer::worst=t;
            if (t<Timer::best)   Timer::best =t;
        }
        report();
        --Timer::indent;
    }
};

long   Timer::indent = 0;
double Timer::best   = FLT_MAX;
double Timer::worst  = 0.0;
double Timer::total  = 0.0;
long   Timer::count  = 0;

#endif
//----------------------------------------------------------------------

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