[boost] [test] investigating Borland test_fp_comparisons failure

21 Jun 2005

      The borland test failures all come down to failing CHECK_NOT_CLOSE
macros defined within the test file.

My understanding is poor, because it looks to me that the following
cases SHOULD fail:

    CHECK_NOT_CLOSE( 0, 1e-20, 1e-5 );
    CHECK_NOT_CLOSE( 0, 1e-30, 1e-5 );
    CHECK_NOT_CLOSE( 0, -1e-10, 0.1 );
    CHECK_NOT_CLOSE( 0.123456, 0.123457, 1e-4 );

    CHECK_NOT_CLOSE( 1.111e-10, 1.112e-10, 0.08999 );

    CHECK_NOT_CLOSE( 1, 1.0002, 1.1e-2 );

However, it is clear the following is a genuine error:

    CHECK_NOT_CLOSE( 0.123456, -0.123457, 1e-3 );

I am obviously missing something, as the majority of compilers pass the
test as written.

-- 
AlisdairM