Re: Re: trouble implementing infinint un/boxing for C binding

On Wed, 2005-03-02 at 21:42 +0100, Denis Corbin wrote:
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> Wesley Leggette wrote:
> | I have a series of functions
> | <http://darbinding.sourceforge.net/libdarc/group__trans__typedefs.html>
> | that can be used to box/unbox an infinint to and from platform types.
> | I'm having trouble implementing these. It looks like the functions I
> | need are infinint::infinint_from<class T> and
> | infinint::infinint_unstack_to<class T>, but these are private functions.
> | Is there a public way of accomplishing this? If not, it looks like I
> | would have to reimplement these functions myself?
> 
> No, you should not have to reimplement theses. The unstack() method for
> infinint is public. it works this way.
> 
> assuming you have an infinint 't' you want to convert to unsigned int x:
> 
> 	x = 0;
> 	t.unstack(x);
> ~        // t is decremented as much as possible, up to zero
> 	// x is incremented as much as t has been decremented
> 
> note that if t was larger than the max value of unsigned int, x is set
> to the max value and t is decremented by this amount only, so t may
> remains different of zero. So usually you need a loop:
> 
> ~        while(t != 0)
> ~         {
> ~            x = 0;
> 	    t.unstack(x);
> ~            for(unsigned int i = 0; i < x; i++)
> ~               /// do something
> 
> ~         }


Ah, thanks! I thought I was missing something here.

> 
> |
> | If those two functions could be changed to public, I can of course
> | provide the patches. Would this break ABI on libdar?
> |
> 
> there is no need to do so.
> 
> | Thanks,
> 
> P.S.: by the way, the libdar-API mailing list is probably a more
> appropriate place for this type of technical discussion, it might also
> interest some API users.
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> 
> 
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-- 
Wesley Leggette <lists-+42/j/[email protected]>



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