[Boost-users] [Boost.UTF] Strange (failed) result on comparing floats

Subject: [Boost-users] [Boost.UTF] Strange (failed) result on comparing floats
From: Olaf Peter (ope-devel_at_[hidden])
Date: 2010-03-31 10:03:17

Hi,

I'm checking some data of consistence using boost's unit test framework
(1.42):

BOOST_CHECK_CLOSE( *v[1].y.max, -43.0e-3,
    std::numeric_limits<double>::epsilon() );

which fails with:

difference{1.6137e-14%} between *v[1].y.max{-0.043000000000000003} and
-43.0e-3{-0.042999999999999997} exceeds 2.2204460492503131e-16%

where v is a std::vector,y a struct and max a boost::optional<double>.
The data where parsed by boost.spirit. This is the only failed test case
from 16 parsed doubles. What's gone wrong here? Do I miss something?

Thanks,
Olaf