Re: [boost] questions about boost multiprecision

Subject: Re: [boost] questions about boost multiprecision
From: Paul A. Bristow (pbristow_at_[hidden])
Date: 2019-03-22 09:42:23

> -----Original Message-----
> From: Boost [mailto:boost-bounces_at_[hidden]] On Behalf Of Robert Ramey via Boost
> Sent: 21 March 2019 22:44
> To: boost_at_[hidden]
> Cc: Robert Ramey
> Subject: [boost] questions about boost multiprecision
> 
> I'm looking more carefully at Boost Multiprecision than I have in the
> past and have a couple of questions:
> 
> It's not clear to me how errors are handled.  For example, what happens
> in a divide by zero?  Or what happens when a result overflows. I'm aware
> that this will likely vary depending on whether the arguments are
> arbitrary precision made a runtime or a precision fixed at compile time.
>   In any case, looking through the manual I can't find this information.
>   Of course this package is so ambitious, that it's possible that I've
> missed it but in that case a pointer would be appreciated.

Someone with superior knowledge has already answered your main query.

Google 'knew'.

(It does reveal that the auto-indexing needs manual help 

- trying 

https://www.boost.org/doc/libs/1_69_0/libs/multiprecision/doc/html/boost_multiprecision/indexes/s04.html#idx_id_75

does not yield any references to overflow :-(
)

None of our documentation tools has yet to solve this sort of need well.

> Spending some time on this makes me appreciate what an incredibly
> ambitious accomplishment this is.  It's really unbelievable.  I would be
> curious how frequently various parts of the package are used.

But I can also assure you from some buglets that have crept out of the woodwork, that some people are making surprisingly
sophisticated use of this package.

Paul

---
Paul A. Bristow
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