Example of C++ 11 std::chrono::duration

Question

I wrote one sample function to understand behavior of std::chrono::duration which recently introduced as part of C++11 standard.

void exampleForDuration() { seconds Sec(minutes(1)); cout<<"1 second is "<<duration_cast<nanoseconds>(seconds(1)).count()<<" nanoseconds"<<endl; cout<<"1 minute is "<<Sec.count()<<" seconds"<<endl; cout<<"1 second is "<<duration_cast<duration<int,centi>>(seconds(1)).count()<<" centiseconds"<<endl; cout<<"100 second is "<<duration_cast<minutes>(seconds(100)).count()<<" minute."<<endl; cout<<"Waiting for 10 seconds..."; auto start=system_clock::now(); this_thread::sleep_for(seconds(10)); cout<<"Done."<<endl; auto end=system_clock::now(); auto waitedFor=end-start; cout<<"Waited for "<<duration_cast<seconds>(waitedFor).count()<<" seconds"<<endl; printCurrentDateTime(); }

Output:

1 second is 1000000000 nanoseconds 1 minute is 60 seconds 1 second is 100 centiseconds 100 second is 1 minute. -------> 1) Waiting for 10 seconds...Done. -------> 2) Waited for 10 seconds

When I ran the above function, the program surprisingly waited for 10 seconds after printing 1) rather than after printing 2). I was expecting the program to wait after printing "Waiting for 10 seconds..." then wait and then print "Done." but it printed "100 second is 1 minute." then waited for 10 seconds and then the rest of output.

Twig · Accepted Answer · 2012-08-26 10:31:18Z

9

Does it work correctly if you change

cout<<"Waiting for 10 seconds...";

to

cout<<"Waiting for 10 seconds..." << endl;

It may be that its not flushing, so it doesn't print that line yet.

answered Aug 26, 2012 at 10:31

Twig

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2 Comments

tshah06 Over a year ago

Yes, It worked after adding endl. Yes it seems that the problem is due to flusing. I removed endl and tried cout.flush() and it worked exactly the way i expected. Thanks a lot for the reply.

Christian Rau Over a year ago

@user1612089 As a side note, this is not only a mere reply, it's an answer and accepting is the correct way to respond to correct answers.

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