Re: [Boost-Users] date_time problems

From: Stephen Love (snl_at_[hidden])
Date: 2003-02-25 09:48:24

Tuesday, February 25, 2003, 1:15:10 PM, you wrote:

EC> I'm trying to test the date_time functionality of boost and am having some 
EC> difficulties. I would like to simply get the current local time into a ptime 
EC> and write it out as an ISO-8601 string.

EC> Using Boost 1.29 and g++ 3.2, when I compile the following code I get a 
EC> number of *linker* errors.

EC> Code:

EC> #include <boost/date_time/posix_time/posix_time_types.hpp>
EC> #include <boost/date_time/posix_time/time_formatters.hpp>

EC> int main()
EC> {
EC> boost::posix_time::ptime pt = boost::posix_time::second_clock::local_time();
EC> std::cout << boost::posix_time::to_iso_extended_string(pt) << std::endl;
EC> }

EC> That code seems pretty straightforward to me. The linker errors look like 
EC> the following:

EC> test.cpp:7: undefined reference to 
EC> `boost::date_time::gregorian_calendar_base<boost::date_time::year_month_day_base<boost::gregorian::greg_year, 
EC> boost::gregorian::greg_month, boost::gregorian::greg_day>, unsigned 
long>>::day_number(boost::date_time::year_month_day_base<boost::gregorian::greg_year, 
EC> boost::gregorian::greg_month, boost::gregorian::greg_day> const&)'

EC> test.cpp:6: undefined reference to 
EC> `boost::date_time::gregorian_calendar_base<boost::date_time::year_month_day_base<boost::gregorian::greg_year, 
EC> boost::gregorian::greg_month, boost::gregorian::greg_day>, unsigned 
long>>::from_day_number(unsigned long)'

EC> (snipped...)

EC> Best as I can tell (cd $BOOST_ROOT/boost/date_time && find . -name '*.cpp' 
EC> -print), there are no .cpp files to be compiled...

EC> Anyone know what's up?
EC> --Eric

EC> _________________________________________________________________
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Tuesday, February 25, 2003, 1:15:10 PM, you wrote:

EC> I'm trying to test the date_time functionality of boost and am having some 
EC> difficulties. I would like to simply get the current local time into a ptime 
EC> and write it out as an ISO-8601 string.

EC> Using Boost 1.29 and g++ 3.2, when I compile the following code I get a 
EC> number of *linker* errors.

EC> Code:

EC> #include <boost/date_time/posix_time/posix_time_types.hpp>
EC> #include <boost/date_time/posix_time/time_formatters.hpp>

You need to include

<boost/date_time/posix_time/posix_time.hpp>

**Note - no _types at the end)

to bring in the I/O stuff for dates and times. The same would go for
just dates (gregorian.hpp instead of gregorian_types.hpp)

HTH
Steve

-- 
Steve Love: steve.love_at_[hidden]
ACCU - accu.org
Promoting Professionalism in Programming