Hi,

I'm wanting to get pointers to various mpfr library functions (because I want to provide a perl wrapping for an mpfr function that takes a "pointer to function" as one of its arguments). The following demo works fine, in so far as it goes: 
use strict;
use warnings;


use Inline C => Config =>
  LIBS => '-lmpfr -lgmp',
  BUILD_NOISY => 1;

use Inline C => <<'EOC';

#include <mpfr.h>

#define FUNC_PTR(x) newSViv(PTR2IV(x))

SV* get_mpfr_mul_func_ptr() {
    return newSViv(PTR2IV(mpfr_mul));
}

SV * get_mpfr_add_func_ptr() {
    return newSViv(PTR2IV(mpfr_add));
}

EOC

print get_mpfr_mul_func_ptr(),  "\n";
print get_mpfr_add_func_ptr(),  "\n";

[download]
That gives me the numeric values of pointers to the mpfr_mul and mpfr_add functions, and I can readily construct the pointers to those functions from that info.

But the problem is that there's maybe 200 mpfr functions for which I would need to create pointers - and I'm not so sure that writing separate XSubs for each of those functions is the best way to proceed.
What would be good is to have a generic function that takes the name of the mpfr function as its argument, and then returns the pointer value of that mpfr function.
Something like: 
SV * get_func_ptr(char * func_name) {
   /* code that returns the pointer
    value for the requested function */
}

[download]
But I don't know of any tricks that would allow that to happen.
What's the best approach here ... a C lookup table ?

Cheers,
Rob

In reply to [OT: C] Getting pointers to functions by syphilis

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