Re: error C2668: 'abs' : ambiguous call to overloaded function

4 Jan 2003


      Detail error message:
d:\boost\boost\boost\date_time\time_duration.hpp(66) : error C2668: 'abs' :
ambiguous call to overloaded function
        d:\Program Files\Microsoft Visual Studio .NET
2003\Vc7\include\math.h(528): could be 'long abs(long)'
        d:\Program Files\Microsoft Visual Studio .NET
2003\Vc7\include\math.h(530): or       'double abs(double)'
        d:\Program Files\Microsoft Visual Studio .NET
2003\Vc7\include\math.h(536): or       'float abs(float)'
        d:\Program Files\Microsoft Visual Studio .NET
2003\Vc7\include\math.h(584): or       'long double abs(long double)'
        d:\Program Files\Microsoft Visual Studio .NET
2003\Vc7\include\stdlib.h(265): or       'int abs(int)'
        while trying to match the argument list
'(boost::date_time::time_resolution_traits<frac_sec_type,res,resolution_adju
st,frac_digits>::fractional_seconds_type)'
        with
        [
            frac_sec_type=boost::int64_t,
            res=nano,
            resolution_adjust=0x03b9aca00,
            frac_digits=9
        ]


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"Black Ice" <yg-boost-users@m.gmane.org> ÐŽÈëÏûÏ¢ÐÂÎÅ
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...
After I move the line 'using std namespace', the error still occurs.
The error occurs in file date_time/time_duration.hpp, line 66.
    min_type minutes() const
    {
      return std::abs(((ticks() / (60*rep_type::res_adjust())) % 60));
    }
--
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"Black Ice" <yg-boost-users@m.gmane.org> ÐŽÈëÏûÏ¢ÐÂÎÅ
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...
boost version 2002-01-02
VC 7.1 Final Beta
"error C2668: 'abs' : ambiguous call to overloaded function" when
compile
following code. The same code can be built successfully in vc6.
Any suggestion are appreciated.
#define DATE_TIME_INLINE
#define BOOST_DATE_TIME_POSIX_TIME_STD_CONFIG
#include <iostream>
#include <string>
using namespace std;
#include <boost/date_time/gregorian/gregorian.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
using namespace boost::gregorian;
using namespace boost::posix_time;
void testDateTime2()
{
 date d(2002, Nov, 1); //an arbitrary date
 ptime t1(d, hours(5) + nanosec(100));//date + time of day offset
 ptime t2 = t1 - minutes(4)+seconds(2);
 ptime now = second_clock::local_time(); //use the clock
 //Get the date part out of the time
 date today = now.date();
 date tommorrow = today + date_duration(1);
 ptime tommorrow_start(tommorrow); //midnight
cout << "d is " << to_iso_extended_string(d) << endl;
 cout << "t1 is " << to_iso_extended_string(t1) << endl;
 cout << "t2 is " << to_iso_extended_string(t2) << endl;
 cout << "now is " << to_iso_extended_string(now) << endl;
 cout << "today is " << to_iso_extended_string(today) << endl;
 cout << "tommorrow is " << to_iso_extended_string(tommorrow) << endl;
 cout << "tommorrow_start is " <<
to_iso_extended_string(tommorrow_start)
<<
endl;
//starting at current time iterator adds by one hour
 time_iterator titr(now,hours(1));
 for (; titr < tommorrow_start; ++titr) {
  cout << to_iso_extended_string(*titr) << endl;
 }
}
--
/*******************/
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