Public mpz_ptr and mpz_srcptr

[Vincent Lefevre]

On 2013-02-04 14:21:54 +0100, Vincent Lefevre wrote:
> 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
  ^^^^^^^^^^^^^^^^
Sorry, an *address* of a local variable.

> able to detect that and output a warning (GCC does that by default).
> So, in practice, there are no risks of errors.

-- 
Vincent Lefèvre <vincent at vinc17.net> - Web: <http://www.vinc17.net/>
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