[C++11] How to measure elapsed time

elapsed_time.cpp

#include <chrono>
#include <iostream>

#include <thread> // to get sleep_for()

/**
 * How to measure elapsed time in C++11.
 *
 * It uses 'steady_clock' because it is monotonic. Being monotonic means that it cannot decrease so it is the most suitable clock
 * for time measurements.
 *
 * @see http://en.cppreference.com/w/cpp/chrono
 */

std::chrono::milliseconds MAX_DURATION(50);

int main() {
	std::chrono::time_point<std::chrono::steady_clock> start = std::chrono::steady_clock::now();

	std::this_thread::sleep_for(std::chrono::milliseconds(100)); //  simulate execution of something to measure

	std::chrono::time_point<std::chrono::steady_clock> stop = std::chrono::steady_clock::now();
	std::chrono::duration<double, std::milli> elapsed = stop - start;

	std::cout << "Elapsed: " << elapsed.count() << " ms" << std::endl;

	if (elapsed > MAX_DURATION) {
		std::cout << "Too long!" << std::endl;
	}
}

/**
 * It is possible to simplify the code with 'using' directives.
 * It is also possible to use 'auto' ;)
 */
using namespace std::chrono;

using Clock = steady_clock;
using TimePoint = time_point<Clock>;
using Milliseconds = milliseconds;
using Duration = duration<double, std::milli>;

output.txt

Elapsed: 99.5516 ms
Too long!