On 2013-02-04 13:57:16 +0100, Torbjorn Granlund wrote:
> I chose to not provide mpz_ptr since I think it would be prone to
> errors. I expect code like this to be created:
>
> mpz_ptr
> foo (mpz_t a, mpz_t b)
> {
> mpz_t c;
> mpz_init (c);
> mpz_add (c, a, b);
> return c;
> }
This is not specific to GMP: every C coder should know that returning
a local variable is incorrect. A good compiler (like GCC) should be
able to detect that and output a warning (GCC does that by default).
So, in practice, there are no risks of errors.
--
Vincent Lefèvre <vinc...@vinc17.net> - Web: <http://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
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