Re: [Boost-users] [timer] eclapsed return zero

Subject: Re: [Boost-users] [timer] eclapsed return zero
From: gmail (hechaos_at_[hidden])
Date: 2008-09-06 00:17:13

i got the where the problem was.thank you

06/09/08 02:43:37, Mike
Marchywka <[e-mail]>:
> ________________________________
> > From: [e-mail]
> > To: [e-mail]
> > Date: Fri, 5 Sep 2008 19:15:07 +0800
> > Subject: [Boost-users] [timer] eclapsed return zero
> > 
> > Hello, I have used the timer class in my application. It works ok
> sometime but i think it dont work correctly.
>
> I'm not sure how timer is supposed to work but a few general comments.
> Other than the obvious, "your mileage may vary" ( it really could be that
> fast),
> I'm not even sure the compiler has to execute the loop if you turn on
> optimizations
> and don't mark count as volatile as the intermediate results are
> unobservable.
> Since no one looks at the end, it really never even needs to push
> count.
>
> I think that is legal anyway, opposing viewpoints welcome :)
>
>
>
> > my code is:
> > #include 
> > #include "boost/timer.hpp"
> > using namespace std;
> > using namespace boost;
> > int main()
> > {
> >    int count=0;
> >    timer t;
> >    for(;count    cout<    return 0;
> > }
> > and the output:
> > 0.015
> > execute time :0.062s
> > 
> > sometime the output is:
> > 0
> > execute time :0.015s
> > 
> > regards
> > hechao
>
> _________________________________________________________________
> Get more out of the Web. Learn 10 hidden secrets of Windows Live.
> http://windowslive.com/connect/post/jamiethomson.spaces.live.com-Blog-cns!550F681DAD532637!5295.entry?ocid=TXT_TAGLM_WL_domore_092008
> _______________________________________________
> Boost-users mailing list
> [e-mail]
> http://lists.boost.org/mailman/listinfo.cgi/boost-users