Re: [q-lang-users] Memory management in libqint

[Albert G. <Dr....@t-...>]

John Cowan wrote:
> Not only that, but Chicken itself is now available as an egg (if you
> have a Chicken loaded, you can upgrade to a later version by installing
> the egg).  Which leads to a curious philosophical question....

... which was already answered two weeks ago on Slashdot. :)

> Which will involve poking about in the GMP docs to figure out how to
> copy an mpz_t, since Chicken's FFI doesn't provide any help as it does
> with strings.

mpz_t x;
mpz_init(x);
mpz_set(x, y); // y is the mpz_t to be copied

> Unfortunately, the FFI is not aware of whether bignums are available
> or not.

Hmm, that's bad. But maybe there's a Lisp function which does this 
check? I guess that Chicken's FFI lets you eval sexps?

> PROBLEM: there doesn't seem to be a way to convert a qexpr to a symbol
> number, the opposite of mksym.  I had assumed that issym does this, but
> the second argument is of type int, not int*, so it only tests if the
> qexpr is some specific, already-known symbol.  This is good for qistrue
> etc., but not for me.  I need to be able to find out which symbol it is
> so that I can return a corresponding Chicken symbol.

That's right, I just put it on the TODO list for Q 7.2.

-- 
Dr. Albert Gr"af
Dept. of Music-Informatics, University of Mainz, Germany
Email:  Dr....@t-..., ag...@mu...
WWW:    http://www.musikinformatik.uni-mainz.de/ag