A timer class encapsulating a static clock that uses the chrono library for nanoseconds precision. I made this for use with a game engine that I have been working on. Just wanted to share with people looking for this kind of precision when it comes to timers.

time.cpp

//since C++ does not allow definition of static data members inside header files, we need to use this .cpp file for initializing 
//the starting time

#include "time.h"

std::chrono::time_point<clock_> Time::start = clock_::now();

time.h

#include <ctime>
#include <chrono>

#define SECOND 1000000000

typedef std::chrono::high_resolution_clock clock_;

class Time
{
public:
  //ctor that is probably never gonna be used
	inline Time() {}

  //resets the starting time to the current time
	inline static void reset() { start = clock_::now(); }

  //returns the time elapsed from the starting time
	inline static long long elapsed() {
		return std::chrono::duration_cast<std::chrono::nanoseconds>(clock_::now() - start).count();
	}

	inline virtual ~Time() {}

private:
	static std::chrono::time_point<clock_> start; //variable to store the starting time
};