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_EQUAL(d1, 0.125);

I get:

[0.12499999999999999 != 0.125]
failed!
Does unittesting in boost use a special precision?

[acehreli]

On Aug 6, 3:55*pm, "saneman" <[e-mail]:

BOOST_CHECK_EQUAL(d1, 0.125);

I get:

[0.12499999999999999 != 0.125]
failed!

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

http://www.boost.org/doc/libs/1_35_0...ECK_CLOSE.html

They provide this link for more useful information:

http://www.boost.org/doc/libs/1_35_0...omparison.html

Ali