Hello,
This might be a bit of a newbie question, but I'd like to clear this doubt. The
problem I'm facing is: I want to define a function in C, and I want to pass
some data to it at definition time. I thought I'd use environments for it:
create a new environment to keep the data, then access it inside the function.
Basically, what I'd like to do is similar to this Scheme setup:
(define (make-f)
(let ((x 1))
(lambda (y) (+ x y))))
(define f (make-f))
(display (f 2))
Except f here should be a C function.
Unfortunately, it seems C-defined functions work differently from Scheme
functions. I've tried using both s7_set_curlet and
s7_make_typed_function_with_environment, but no matter what I do, using
s7_curlet I always get back the rootlet.
So please tell me: is this actually possible? If it's not how should I rethink
this problem?
(As for why I need this: I was trying to write a small C++ wrapper for s7 and
one feature I'd like to have is to be able to automatically define functions
that aren't necessarily s7_function's, by doing the necessary conversions and
then calling the original function. I tried doing that by declaring a template
function that would take a function pointer, but then I can't figure out how to
pass the function pointer to the s7_function I'm defining. You can see the work
I've done here:
https://github.com/chrg127/s7-tests/blob/52fdeb4692ac21e2be4e899c6c80db184f1d17c5/s7.hpp#L346)
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