while (done.wait_for(std::chrono::milliseconds(100)) != future_status::ready && !progress.wasCanceled()) {
progress.setValue(lrint(100000.0 * current_value));
}
if (progress.wasCanceled()) {
unlink(filename.c_str());
while (done.wait_for(std::chrono::milliseconds(100)) != future_status::ready && !progress.wasCanceled()) {
progress.setValue(lrint(100000.0 * current_value));
}
if (progress.wasCanceled()) {
unlink(filename.c_str());