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__
 
#include <chrono>
#include <iosfwd>
#include <iostream>
 
 
class Stopwatch {
    public:
        Stopwatch();
 
        typedef std::chrono::steady_clock clock;
 
        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 clock::time_point start_;
        mutable long              elapsed_;
        bool                      stopped_;
 
        static const long s_to_us = 1000000L;
    };
 
std::ostream& operator<<(std::ostream&, const Stopwatch&);
 
#endif