Patches item #1438626, was opened at 2006-02-25 06:49 Message generated for change (Settings changed) made by mclow You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=307586&aid=1438626&group_id=7586 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: David Benbennick (dbenbenn)

Assigned to: Jonathan Turkanis (turkanis) Summary: rational.hpp::gcd returns a negative value sometimes

Initial Comment: boost/rational.hpp provides a gcd function, which is supposed to be non-negative. It sometimes returns a negative value, which can cause problems in other parts of rational.hpp. For example, assuming long is a 4-byte type, boost::gcd<long>(6, -2147483648) returns -2. As a result, boost::rational<long>(-1073741821, 6) + boost::rational<long>(-1073741827, 6) produces an invalid rational number, 1073741824/-3, instead of the correct answer -1073741824/3. Here is a small patch to fix the problem. Note that this is how boost/math/common_factor_rt.hpp calculates the greatest common divisor. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=307586&aid=1438626&group_id=7586 ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 _______________________________________________ Boost-bugs mailing list Boost-bugs@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/boost-bugs