Time elapsed

#include <iostream>
#include <chrono>
#define TIME_ELAPSED(code) auto start = std::chrono::high_resolution_clock::now(); code auto end = std::chrono::high_resolution_clock::now(); std::cout << "Time elapsed : " << static_cast<double>(std::chrono::duration_cast<std::chrono::nanoseconds>(end - start).count()) / 1000000000.0 << "s";

int main()
{
    TIME_ELAPSED(
        for (auto index = 0; index < 100000; ++index)
            std::cout << "Bla bla bla";
    )
    return 0;
}