A simple macro for quick benchmarking.

benchmark_macro.hpp

#pragma once
// https://gist.github.com/gongzhitaao/7062087
class Timer {
	using clock_ = std::chrono::high_resolution_clock;
	using milli_ = std::chrono::duration<double, std::milli>;
public:
	Timer() : beg_(clock_::now()) {}
	void reset() { beg_ = clock_::now(); }
	double elapsed() const {
		return std::chrono::duration_cast<milli_>
			(clock_::now() - beg_).count();
	}
private:
	std::chrono::time_point<clock_> beg_;
};

#define MEASURE(__block, __itr) \
	{ Timer _tmr; \
	for (auto _i = 0; _i < __itr; ++_i) { __block } \
	auto _t = _tmr.elapsed(); \
	std::cout << _t << std::endl; }
	
// example	
int main() {
	MEASURE({
		// some block of code
	}, iterations);
  
	return 0;
}