{

auto start = std::chrono::high_resolution_clock::now();

auto end = start + std::chrono::duration<double, std::milli>(delay);

std::chrono::high_resolution_clock::time_point final;

if (!precise)

{

std::this_thread::sleep_for(std::chrono::duration<double, std::milli>(delay));

final = std::chrono::high_resolution_clock::now();

}

else

{

while ((final = std::chrono::high_resolution_clock::now()) < end) std::this_thread::yield();

}

return std::chrono::duration<double, std::milli>(final - end).count();