Timing algorithm: clock() vs time() in C++

Question

For timing an algorithm (approximately in ms), which of these two approaches is better:

clock_t start = clock();
algorithm();
clock_t end = clock();
double t         


        

Answer 1

would be a better library if you're using C++11.

#include 
#include 
#include 

void f()
{
    std::this_thread::sleep_for(std::chrono::seconds(1));
}

int main()
{
    auto t1 = std::chrono::high_resolution_clock::now();
    f();
    auto t2 = std::chrono::high_resolution_clock::now();
    std::cout << "f() took "
              << std::chrono::duration_cast(t2-t1).count()
              << " milliseconds\n";
}

Example taken from here.