Stopwatch.h

// WARNING: Changes to this file must be contributed back to Sawyer or else they will
//          be clobbered by the next update from Sawyer.  The Sawyer repository is at
//          https://github.com/matzke1/sawyer.




#ifndef Sawyer_Stopwatch_H
#define Sawyer_Stopwatch_H

#include <Sawyer/Sawyer.h>

#ifdef SAWYER_HAVE_BOOST_CHRONO
# include <boost/chrono/duration.hpp>
# include <boost/chrono/system_clocks.hpp>
#endif

namespace Sawyer {

class SAWYER_EXPORT Stopwatch {
public:
#ifdef SAWYER_HAVE_BOOST_CHRONO
    typedef boost::chrono::high_resolution_clock::time_point TimePoint;
    typedef boost::chrono::duration<double> Duration;
#else
    typedef double TimePoint;
    typedef double Duration;
#endif

private:
#include <Sawyer/WarningsOff.h>
    mutable TimePoint begin_ = 0.0;                     // time that this stopwatch (re)started
    mutable Duration elapsed_ = 0.0;                    // sum of elapsed run time in seconds
    bool running_ = false;                              // state of the stopwatch: running or not
#include <Sawyer/WarningsRestore.h>

public:
    explicit Stopwatch(bool start=true) {
        start && this->start();
    }

    double clear(double value=0.0);

    double start();
    double start(double value);
    double restart();

    double stop(bool clear=false);

    double report(bool clear=false) const;

    bool isRunning() const { return running_; }

    std::string toString() const;

    static std::string toString(double seconds);
};


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

} // namespace
#endif