[boost] [test] comparing floating point values

From: Jody Hagins (jody-boost-011304_at_[hidden])
Date: 2007-05-15 11:51:12

OK, here is an opportunity to get me clear on comparing floating point
values.  I've found a very simple example, that I can not get to work --
and understand...

Say I have a class that saves and restores a class.  In the class, I
have a double, a float, and a long double.  As a test, I set the
"floating" values to std::numeric_limits< T >::min() and
std::numeric_limits< T >::max(), and then save the values, restore them,
and compare the restored values to the originals.

Obviously, I can not use BOOST_CHECK_EQUAL(), but I am clueless as to
how to use the macros for comparing floating point values.  Is there
anything in numeric_limits that I should use to base the percentage
value?

Here's a chance for someone to finally clear my understanding of how to
compare floating point value... please ?!?!?

Thanks!