On Wednesday 21 February 2007 09:27, Guillaume Melquiond wrote:
Le mardi 20 février 2007 à 18:56 +0000, Marco Correia a écrit :
Hi,
I'm a little bit confused about the documentation in http://www.boost.org/libs/numeric/interval/doc/rounding.htm, in the subsection "Transcendental functions". Does the "Please note" paragraph means that the provided classes for transcendal functions (_opp and _std) do not guarantee the inclusion property?
Yes.
From what I understood it says that it depends on the implementation of the
std::* math functions, that, in most cases, don't obey current rounding mode. Am I getting this right?
Yes.
In case I am, does anyone knows if I'm safe with gcc std library (perhaps by using the -frounding-math switch)?
No, unfortunately.
You have to rely either on a library that provides functions rounded in accordance with the rounding mode of the processor like Sun's libmcr, or on a library that provides functions with explicit rounding direction like MPFR or CRlibm. The transc.cpp example file of the library shows how to write a class relying on MPFR; for Boost 1.35, it may be replaced / extended with a class relying on CRlibm.
Best regards,
Guillaume
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Thanks a lot!
Marco
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Marco Correia