Re: [boost] [math] boost::math::isfinite fails with --fast-math

Subject: Re: [boost] [math] boost::math::isfinite fails with --fast-math
From: John Maddock (boost.regex_at_[hidden])
Date: 2012-11-26 08:13:21

> I'm wandering if this is to be expected, the following code
> fails if compiled with --fast-math:
>
> //====================================================
> #include <boost/math/special_functions/fpclassify.hpp>
> int main() {
>   const float a = 0.0f/0.0f;
>   assert(not boost::math::isfinite(a));
> }

Which fails - does the 0/0 actually yield an infinity?  Or is it isfinite 
that fails?

Either way is hard to make guarentees once you enable an option like that.

John.