[boost] [Test] BOOST_CHECK_CLOSE Feature request

From: John Maddock (john_at_[hidden])
Date: 2005-11-10 11:47:10

I have a couple of feature requests for Boost.Test:

1) Can BOOST_CHECK_CLOSE please print the actual difference between the 
values (as a percent to match the tolerance) as well as the values 
themselves?  The reason this is important, is that it's not always easy to 
get this value from the input values - because the precision of the machine 
on which the test is run far outstrips that of the author's machine, so his 
calculator isn't any use :-(

2) Can we please have a BOOST_CHECK_EPSILON, that uses a whole number of 
epsilon as the tolerance?  IMO BOOST_CHECK_CLOSE should have been written 
this way to begin with, but it's too late now.  Again it should print out 
the actual relative error as a multiple of epsilon as well as the input 
values.  Actually while we're at it the absolute error may be useful to have 
in some situations as well :-)

BTW, in case it helps: I've switched to using std::pow(two, 
1-std::numeric_limits<T>::digits) to calculate machine epsilon, because of 
the strange behaviour on Darwin with long doubles if you use 
numeric_limits<>::epsilon() (see 
http://lists.boost.org/Archives/boost/2005/09/93390.php).

Thanks!

John.