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

[Mirko Vukovic]

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