utimer.cpp

#include <iostream>
#include <chrono>
#include <thread>


#define START(timename) auto timename = std::chrono::system_clock::now();
#define STOP(timename, elapsed) auto elapsed = std::chrono::duration_cast < std::chrono::microseconds > (std::chrono::system_clock::now() - timename).count();

class utimer {
    std::chrono::system_clock::time_point start;
    std::chrono::system_clock::time_point stop, pause;
    std::string message;
    using usecs = std::chrono::microseconds;
    using msecs = std::chrono::milliseconds;

    private:
        long * us_elapsed;

    public:

        utimer(const std::string m): message(m), us_elapsed((long * ) NULL) {
            start = std::chrono::system_clock::now();
        }

        utimer(const std::string m, long * us): message(m), us_elapsed(us) {
            start = std::chrono::system_clock::now();
        }

        ~utimer() {
            stop = std::chrono::system_clock::now();
            std::chrono::duration < double > elapsed = stop - start;
            auto musec = std::chrono::duration_cast < std::chrono::microseconds > (elapsed).count();

            std::cout << message << " computed in " << musec << " usec " <<
                std::endl;
            if (us_elapsed != NULL)
                ( * us_elapsed) = musec;
        }
        
        auto elapsed() {
			pause = std::chrono::system_clock::now();
			std::chrono::duration < double > elapsed = pause - start;
			auto musec = std::chrono::duration_cast < std::chrono::microseconds > (elapsed).count();
			return musec;
		}
};