C++ time nanoseconds

#include <iostream>
#include <chrono>

int main() {
    auto start = std::chrono::high_resolution_clock::now();
    // operation to be timed ...
    auto finish = std::chrono::high_resolution_clock::now();
    auto time_in_nanoseconds =  std::chrono::duration_cast<std::chrono::nanoseconds>(finish-start).count();
}

Source: stackoverflow.com

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