I am trying to find a way to make the boost unit test framework use an absolute difference for floating point comparison instead of the relative difference. 

I searched the documentation to try to find a suitable decorator but couldn’t find anything. Any help is much appreciated!

#define BOOST_TEST_MODULE example
#include <boost/test/included/unit_test.hpp>
// boost::unit_test::tolerance uses relative difference and hence this test will pass; 
// is there anything I can use here to indicate absolute difference?
BOOST_AUTO_TEST_CASE(my_test, * boost::unit_test::tolerance(0.1) ) 
{
  BOOST_TEST(10.1 == 10.3);
}