double precision and boost unittest?

[saneman]

I have a function that returns a double:

double d1 = compute(a,b,c);

when I do:

std::cout << d1 << std::endl;

I get:

0.125

but when I do:

BOOST_CHECK_EQU AL(d1, 0.125);

I get:

[0.1249999999999 9999 != 0.125]
failed!


Does unittesting in boost use a special precision?

[acehreli@gmail.com]

Re: double precision and boost unittest?

On Aug 6, 3:55 pm, "saneman" <as...@asd.comw rote:

BOOST_CHECK_EQU AL(d1, 0.125);
>
I get:
>
[0.1249999999999 9999 != 0.125]
failed!

It is not always possible to compare floating point values for
equality. Use BOOST_CHECK_CLO SE instead:

http://www.boost.org/doc/libs/1_35_0/libs/test/doc/components/test_tools/reference/BOOST_CHECK_CLOSE.html

They provide this link for more useful information:

http://www.boost.org/doc/libs/1_35_0/libs/test/doc/components/test_tools/floating_point_comparison.html

Ali