stop_watch.h

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#ifndef STOPWATCH_H_
#define STOPWATCH_H_


#include <ctime>
#include <sstream>
#include <sys/time.h>
#ifdef _WIN32
#include <Windows.h>
#endif


class SimpleStopWatch {
        clock_t startClock;

public:
        void start() { startClock = clock(); };

        double stop() { return ((double)(clock()-startClock))/(double)CLOCKS_PER_SEC; };
};


#ifdef _WIN32
class PrecisionStopWatch {
        LARGE_INTEGER precisionClock;
        LARGE_INTEGER precisionFrequency;

public:
        PrecisionStopWatch() {
                precisionClock.QuadPart = 0;
                if(!QueryPerformanceFrequency(&precisionFrequency)) printf("PrecisionStopWatch: Error: Frequency query failed.\n");
        };

        void precisionStart() {
                if(!QueryPerformanceCounter(&precisionClock)) printf("PrecisionStopWatch: Error: precisionStart query failed.\n");
        };

        double precisionStop() {
                LARGE_INTEGER precisionClockEnd;
                if(!QueryPerformanceCounter(&precisionClockEnd)) printf("PrecisionStopWatch: Error: precisionStop query failed.\n");
                return (double)(precisionClockEnd.QuadPart - precisionClock.QuadPart) / (double)precisionFrequency.QuadPart;
        };
};
#else
/*
 * Linux version of precision host timer. See http://www.informit.com/articles/article.aspx?p=23618&seqNum=8
 */
class PrecisionStopWatch {
        struct timeval precisionClock;

public:
        PrecisionStopWatch() {
                gettimeofday(&precisionClock, NULL);
        };

        void precisionStart() {
                gettimeofday(&precisionClock, NULL);
        };

        double precisionStop() {
                struct timeval precisionClockEnd;
                gettimeofday(&precisionClockEnd, NULL);
                return ((double)precisionClockEnd.tv_sec + 1.0e-6 * (double)precisionClockEnd.tv_usec) - ((double)precisionClock.tv_sec + 1.0e-6 * (double)precisionClock.tv_usec);
        };
};
#endif

#endif //STOPWATCH_H_