{

auto cost = steady_clock::now() - start_time_point_;

return cost.count();

{

auto ns_count = elapsed();

if (ns_count <= threshold_ns)

return;

#if USE_PRINTF

printf("TIME_COST: %8" PRIu64 ".%03" PRIu64 " us at [%s] \n",

ns_count / 1000, ns_count % 1000, tag);

#else

cout << "TIME_COST: " << setw(8) << ns_count / 1000

<< '.' << setw(3) << setfill('0') << ns_count % 1000 << setfill(' ')

<< " us on [" << tag << ']' << endl;

#endif

{

const uint64_t nsec_per_sec = 1000000000;

struct timespec end_time;

clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &end_time);

uint64_t ns_count = (end_time.tv_sec - start_time_.tv_sec) * nsec_per_sec;

ns_count += end_time.tv_nsec;

ns_count -= start_time_.tv_nsec;

return ns_count;

{

auto ns_count = elapsed();

if (ns_count <= threshold_ns)

return;

#if USE_PRINTF

printf("CPU_TIME_COST: %8" PRIu64 ".%03" PRIu64 " us at [%s] \n",

ns_count / 1000, ns_count % 1000, tag);

#else

cout << "CPU_TIME_COST: " << setw(8) << ns_count / 1000

<< '.' << setw(3) << setfill('0') << ns_count % 1000 << setfill(' ')

<< " us on [" << tag << ']' << endl;

#endif

std::chrono::nanoseconds threshold) :

file_name_(file_name),

func_name_(func_name),

line_(line),

threshold_(threshold)

{

start_time_point_ = steady_clock::now();

{

if (stoped_)

return;

stoped_ = true;

auto cost = steady_clock::now() - start_time_point_;

if (cost < threshold_)

return;

auto ns_count = cost.count();

#if USE_PRINTF

printf("TIME_COST: %8" PRIu64 ".%03" PRIu64 " us at %s() in %s:%u\n",

ns_count / 1000, ns_count % 1000,

func_name_, Basename(file_name_), line_);

#else

cout << "TIME_COST: " << setw(8) << ns_count / 1000

<< '.' << setw(3) << setfill('0') << ns_count % 1000 << setfill(' ')

<< " us at " << func_name_ << "() in "

<< Basename(file_name_) << ':' << line_ << endl;

#endif