Ping? Regards Hartmut

-----Original Message----- From: Hartmut Kaiser [mailto:hartmut.kaiser@gmail.com] Sent: Wednesday, March 11, 2009 8:35 AM To: 'boost@lists.boost.org' Cc: 'John Maddock' Subject: [Math] boost::math::signbit returns false for -NAN

Hi all,

the boost::math::signbit function in trunk fails for an argument of - NAN.

#include <boost/math/special_functions/sign.hpp>

int main() { using boost::math::signbit; BOOST_ASSERT(signbit(-std::numeric_limits<double>::quiet_NaN())); return 0; }

I'd expect to get a '1' back, but the function returns zero and the assertion fails. I know it worked while using Jon Rade's floating point utilities library from the vault. Does this have been integrated?

Regards Hartmut