Stopwatch.hh

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/* 

    Cadabra: a field-theory motivated computer algebra system.
    Copyright (C) 2001-2011  Kasper Peeters <kasper.peeters@aei.mpg.de>

   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, either version 3 of the
   License, or (at your option) any later version.

   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, see <http://www.gnu.org/licenses/>.
 
*/

#ifndef stopwatch_hh__
#define stopwatch_hh__

extern "C" {
#include <sys/time.h>
#include <unistd.h>
#include <signal.h>
}

#include <iostream>

class Stopwatch {
    public:
        Stopwatch();

        void reset();
        void start();
        void stop();
        long seconds() const;
        long useconds() const;
        bool stopped() const;

        friend std::ostream& operator<<(std::ostream&, const Stopwatch&);

    private:
        void checkpoint_() const;
        mutable struct timeval  tv1,tv2; 
        mutable struct timezone tz;
        mutable long diffsec, diffusec;
        bool stopped_;
};

std::ostream& operator<<(std::ostream&, const Stopwatch&);

#endif