Comments (4)
How about creating an external scheme function (in .scm file) that takes optional arguments, and call the appropriate primitive as needed?
from atomspace.
William's solution is the easiest, by far. That is, write a very small scheme wrapper (only 3-6 lines of scheme code) that takes an optional number of arguments, have it supply defaults for the missing values, and then always call C++ with a fixed number of arguments.
Example in next post ...
We need a version of cog-bind
which takes an optional integer N for the number of solutions N to return. Currently, we have cog-bind
, which returns all solutions (and may take too long, e.g. for the genetic data) The 'cog-single` accepts N but is hardwired for N=1.
from atomspace.
So for example, use C++ to define cog-fc-full
, and the in the (opencog query)
module, add something like this:
(define* (cog-fc arg-a #:optional opt-arg-b)
(if (not opt-arg-b) ;;; it arg-b is #f i.e. if arg-b is missing ...
(cog-fc-full arg-a 42) ; default arg-b is 42
(cog-fc-full arg-a opt-arg-b) ;; user supplied arg-b
))
this way, cog-fc
can be called with one or two args.
See https://www.gnu.org/software/guile/manual/html_node/lambda_002a-and-define_002a.html for details
from atomspace.
I found the best solution is to define dedicated functions for each rule-based system. For instance in the scm config file of PLN the following 2 functions are defined
(pln-fc source)
(pln-bc target)
from atomspace.
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from atomspace.