Yes, I was looking at these examples all the time:
http://www.boost.org/doc/libs/1_45_0/libs/test/doc/html/utf/testing-tools/custom-predicate.html
but i couldn't actually find that there is a solution to my problem and your suggestion gave me direction.
Complete solution looks like this:

using namespace boost::test_tools;
predicate_result
compare(MyClass const& expected, MyClass const& received)
{
   if(expected.a != received.a) {
        predicate_result res( false );
        res.message() << "Difference in field a: " << expected.a << ", " << received.a;
    return res;
   }

   if(expected.b != received.b) {
        predicate_result res( false );
        res.message() << "Difference in field b: " << expected.b << ", " << received.b;
    return res;
   }

   return true;
}

Thanks

2011/11/14 Gennadiy Rozental <rogeeff@gmail.com>
Jarosław Bober <jaroslaw.bober <at> gmail.com> writes:

>
>
> Thank you Gennadiy, now it works like it should :)Regards

Actually in a haste I forgot to actually write "return res;" and the result type
should be predicate_result, but looks like you've figured it out ;)

Gennadiy


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