wxtimer.h

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#ifndef wxtimer_h
#define wxtimer_h
 
// std includes
#include <iostream>
#include <string>
#include <sstream>
 
#include <chrono>
 
#include <mpi.h>
#include <iomanip>
 
class WxTimer
{
public:
    WxTimer() = default;
 
    void startTimer()
    {
        start = clock_.now();
    }
 
    void stopTimer()
    {
        end = clock_.now();
        diff = end - start;
    }
 
    unsigned daysElapsed() const
    {
        return std::chrono::duration_cast<std::chrono::hours>(diff).count() / (24);
    }
 
    real secondsElapsed() const
    {
        return std::chrono::duration_cast<std::chrono::nanoseconds>(diff).count() * 1e-9;
    }
 
    std::string timeElapsedAsString() const
    {
        std::ostringstream te;
        te << std::fixed << std::setprecision(3);
        unsigned days = daysElapsed();
        real seconds = secondsElapsed();
 
        if (days > 0)
        {
            real remainder_seconds = seconds - days * 24 * 3600;
            if (days == 1)
            {
                te << " 1 day and " << remainder_seconds << " seconds";
            }
            else
            {
                te << days << " days and " << remainder_seconds << " seconds";
            }
        }
        else
        {
            te << seconds << " seconds";
        }
        return te.str();
    }
 
private:
    std::chrono::high_resolution_clock clock_;
    std::chrono::high_resolution_clock::time_point start, end;
    std::chrono::high_resolution_clock::duration diff;
};
 
#endif // wxtimer_h