[GSLL-devel] looking for a grid declaration to store nil/t

[Liam Healy]

The purpose of foreign-array is to communicate with foreign libraries.
 In general I don't think there's a standard for the representation of
booleans in foreign code.  I'm not sure how C stores booleans, and
whether there's even a standard for that, but you might aim in that
direction.  Whatever it is, if CFFI supports it, it should be pretty
easy to make an array of that type.

Liam

On Fri, Dec 17, 2010 at 3:59 PM, Mirko Vukovic <mirko.vukovic at gmail.com> wrote:
> I am writing a library on top of grid/foreign-array that provides math
> functions corresponding to the ones in the Numbers Dictionary of the
> hyperspec (http://www.lispworks.com/documentation/HyperSpec/Body/c_number.htm)
>
> (I will share it when it is done)
>
>
> For those that are interested into details, it parses declarations of the type:
>
> ...
>    (cos ((!F :return !F)
>          (!C :return !C)))
>    (tan ((!F :return !F)
>          (!C :return !C)))
> ...
>
> to generate generic functions and methods that will accept grid vectors:
>
> (grid-cos #1(....)) returns a grid double-float of cosines of double floats
> (grid-cos #2(...)) returns a grid complex double-float of cosines of
> complex arguments.
>
> Question:  I am not sure how to store results for predicate type
> functions, such as minusp, zerop, and comparison functions >, = that
> return t or nil.
>
> Is there a foreign-array or cl-array type that stores nils and t's?
>
> Thanks,
>
> Mirko
>
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