Re: [Boost-users] BOOST_CHECK_CLOSE with integral types

"Will Bryant" wrote in message news:4331173C.7060405@core-dev.co.nz...

Hi all,

Is BOOST_CHECK_CLOSE supposed to work with integral types? I find that if I try:

long var1 = 1001; BOOST_CHECK_CLOSE(var1, 2000L, 10L);

under both MSVC 2005 and GCC 3.4, it'll pass, which is wrong as far as I can see - whereas:

double var2 = 1001.0; BOOST_CHECK_CLOSE(var2, 2000.0, 10.0);

fails as it should.

Why is this? int has the same problem.

BOOST_CHECK_CLOSE algorithm involves division (it compared relative distance with tolerance). |a-b|/|a| will always produce 0 for integral types. Which is less then any tolerance you could specify. Gennadiy