Re: [Boost-users] unit test BOOST_CHECK_CLOSE absolute

Subject: Re: [Boost-users] unit test BOOST_CHECK_CLOSE absolute
From: Paul A. Bristow (pbristow_at_[hidden])
Date: 2015-01-12 10:01:45

> -----Original Message-----
> From: Boost-users [mailto:boost-users-bounces_at_[hidden]] On Behalf Of
> Renaud Lepère
> Sent: 10 January 2015 13:10
> To: boost-users_at_[hidden]
> Subject: [Boost-users] unit test BOOST_CHECK_CLOSE absolute
> 
> 
> I am doing unit tests using boost utf but I have sometimes problems with
> BOOST_CHECK_SMALL because it checks relative value.
> 
> For example, I am comparing coordinates in 2d spaces and the relative value is
not
> important, the meaningfull value is the absolute difference between
coordinates.
> 
> I have seen that I can do a
> BOOST_CHECK_SMALL(fabs(x - expected_x), 1e-3);
> 
> but in this can I don't have a good message when the test fails (it does not
show the
> value of x and the expected_x).
> 
> In fact I would like to have something like BOOST_CHECK_CLOSE_ABSOLUTE ?
> Is there something equivalent or how can I do something like this ?

FWIW I've also wanted the *values* in a message (rather than just a test fail).

(But that's separate from the relative v absolute distinction).

Paul