Re: [boost] [test] investigating Borland test_fp_comparisons failure

From: Gennadiy Rozental (gennadiy.rozental_at_[hidden])
Date: 2005-06-21 09:56:55

"Alisdair Meredith" <alisdair.meredith_at_[hidden]> wrote in message 
news:d98vdr$oia$1_at_sea.gmane.org...
> Gennadiy Rozental wrote:
>
>> All of the above should pass, since the algotrithm used:
>>
>> x and y are close iff:
>>
>> |x-y| / |x| < tol/100 and |x-y| / |y| < tol/100
>>
>> Obviosly nothing could be close to zero and rest are failing also.
>
> In that case I find the algorithm to be confusingly named, as in all
> these cases the test value is 'closer' to zero than the delta.  I would
> not expect closeness to zero (or any other arbitrary number) to affect
> a general proximity test.

There is a new tool introduced in this release called BOOST_CHECK_SMALL to 
check that some value is small enough (close to zero). That one uses 
absolute (vs. relative) values comparisons.

Gennadiy