Simple function to time different versions of a class

time_it.cpp

template<typename T>
int time_it()
{
	using milliseconds_t = std::chrono::duration < int, std::milli >;
	//start time
	auto start = std::chrono::steady_clock::now();
	
	//instantiate class
	T class_to_time;
	//do stuff to time it
	class_to_time.do_something();
	class_to_time.do_something_else();
	
	//get time and return
	auto end = std::chrono::steady_clock::now();
	auto duration = std::chrono::duration_cast<milliseconds_t>(end - start);
	return duration.count();
}

// usage:
// std::cout << "-- Time: " << time_it<ClassVersion1>();
// std::cout << "-- Time: " << time_it<ClassVersion2>();