Re: Need timer with ability to time long intervals and sub-second precision

Alberto Ganesh Barbati <>
Fri, 1 Aug 2008 09:44:17 CST
jeremit0 ha scritto:

I need a timer that has sub-second precision and can time for longer
than 2 hours.

I have used the clock_t data type and the clock() function to
determine the elapsed time of a calculation. A problem arose when the
elapsed time was more than 1 hour and 20 minutes, the clock_t data
would wrap around and the time difference would become negative.

I started looking at using the time_t data type. It looks like it can
do a large enough time difference, but it lacks the sub-second
precision I desire.

Does anyone know if what I want is possible? Am I going to have to
use two different timers; one for long times and one for short times?

Have you tried Boost.DateTime?

the boost::ptime class uses 64-bits with microsecond resolution, which
should be quite enough for your needs.


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