#include <sys/time.h>
    namespace Time {
        // returns time since this function was first called, in seconds
        inline double Now(){
            static timeval now;
            static timeval start;

            static bool started = false;
            if(!started){
                gettimeofday(&start, 0);
                started = true;
            }

            gettimeofday(&now, 0);
            return (now.tv_sec - start.tv_sec) + (double)(now.tv_usec - start.tv_usec) / (double)1000000;
        }

        inline double Date(){
            static timeval now;
            gettimeofday(&now, 0);
            return now.tv_sec + (double)now.tv_usec / 1000000.0;
        }

        #include <unistd.h>

        inline void Sleep(double ms){
            usleep(ms*1000000.0);
            //double end = Now() + ms;
            //while(Now() < end) sleep(0);
        }
    }