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Subject: Re: [boost] Arbitrary precision arithmetic
From: joel (joel.falcou_at_[hidden])
Date: 2009-08-19 12:22:21

Barend Gehrels wrote:
> Hi,
> Paul A. Bristow wrote:
>>> The boost community is not set up to duplicate what GMP does. But I
>>> think we could do something else very well if we focus on correctness,
>>> portability, and metaprogramming API tastiness instead of making the
>>> tires smoke.
>> Or better, as recently proposed, also allow one to use GMP if desired.
>> That should get the tires warm, if not smoking.
> You might refer to our mails this spring. We (Bruno and I) are
> implementing a 'numeric adaptor' library, to be optionally used in our
> generic geometry library, but developed completely separately.
> It is currently in the Boost Sandbox,
> It provides interfaces to GMP and CLN (another big number library),
> which can be used the same way as normal (IEEE) integers / doubles can
> be used. We recently changed and simplified the design. It now works
> more or less as Joel mailed today. It is template based, no virtual
> functions here. So Joel's sample would become:
> double x;
> boost::numeric_adaptor::gmp_value_type y;
> x = abs(x); <-- call the IEEE implementation
> y = abs(y); <-- call the GMP implementation
Interesting. I may give a shot at this using my framework and see how it

Joel Falcou - Assistant Professor
PARALL Team - LRI - Universite Paris Sud XI
Tel : (+33)1 69 15 66 35

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