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* doc/lispref/internals.texi (Module Values): Add a GMP example

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Philipp Stephani 2019-04-24 13:54:54 +02:00
parent c4bacb1215
commit b6d8d34aed
1 changed files with 25 additions and 0 deletions
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doc/lispref/internals.texi
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@ -1543,6 +1543,31 @@ integral object. After you have finished using
or similar.
@end deftypefn
The following example uses GMP to calculate the next probable prime
after a given integer:
@example
#include <assert.h>
#include <gmp.h>
#define EMACS_MODULE_GMP
#include <emacs-module.h>
static emacs_value
next_prime (emacs_env *env, ptrdiff_t nargs, emacs_value *args,
void *data)
@{
assert (nargs == 1);
emacs_mpz p;
mpz_init (p.value);
env->extract_big_integer (env, args[0], &p);
mpz_nextprime (p.value, p.value);
emacs_value result = env->make_big_integer (env, &p);
mpz_clear (p.value);
return result;
@}
@end example
The @acronym{API} does not provide functions to manipulate Lisp data
structures, for example, create lists with @code{cons} and @code{list}
(@pxref{Building Lists}), extract list members with @code{car} and