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Subject: Re: [boost] [Units] test_trig fails on Sandia-darwin-4.4 (caused by compile-time evaluation of math functions)
From: Paul A. Bristow (pbristow_at_[hidden])
Date: 2011-08-23 05:27:38
> -----Original Message-----
> From: boost-bounces_at_[hidden] [mailto:boost-bounces_at_[hidden]] On Behalf Of Mathias
> Gaunard
> Sent: Sunday, August 21, 2011 3:56 PM
> To: boost_at_[hidden]
> Subject: Re: [boost] [Units] test_trig fails on Sandia-darwin-4.4 (caused by compile-time
evaluation of
> math functions)
<snip>
> I don't know what BOOST_CHECK_CLOSE_FRACTION does,
It allows an 'approximately equal' check, with a tolerance, usually an epsilon or two for built-in
functions.
BOOST_CHECK_CLOSE_FRACTION(v1, v2, std::numeric_limits<double>::epsilon());
Using exact comparison (BOOST_CHECK) is always dodgy for floating point.
> but I don't think there is any guarantee at all about the accuracy of the standard mathematical
functions.
Definitely not, especially for corner cases.
Paul
--- Paul A. Bristow, Prizet Farmhouse, Kendal LA8 8AB UK +44 1539 561830 07714330204 pbristow_at_[hidden]
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