c 2b 2b time nanoseconds

1#include <iostream>
2#include <chrono>
3
4int main() {
5    auto start = std::chrono::high_resolution_clock::now();
6    // operation to be timed ...
7    auto finish = std::chrono::high_resolution_clock::now();
8    auto time_in_nanoseconds =  std::chrono::duration_cast<std::chrono::nanoseconds>(finish-start).count();
9}
10