Use este código para obter o timestamp de nanosegundos usando std::chrono
nanosecond_now.hpp
#pragma once
#include <chrono>
#include <cstdint>
inline uint64_t NanosecondNow() {
auto now = std::chrono::system_clock::now();
auto duration = now.time_since_epoch();
auto nanoseconds = std::chrono::duration_cast<std::chrono::nanoseconds>(duration);
return static_cast<uint64_t>(nanoseconds.count());
}
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