Re: bookkeeping to prepare for a 64-bit EMACS_INT on 32-bit hosts

[Paul Eggert <eggert@cs.ucla.edu>]

On 05/02/11 11:12, Stefan Monnier wrote:
> Given that
> 
>   #define checked_cast(t,x) ({ t v = (x); v})
> 
> can't be written in ISO C (AFAIK), I either form will be suboptimal,
> so there's no need to change the code.

How about the following idea instead?  Put this into lisp.h:

  static inline EMACS_INTPTR to_EMACS_INTPTR (EMACS_INTPTR a) { return a; }

Then, instead of this:

  EMACS_INTPTR ii = i;
  gpointer gi = (gpointer) ii;

(which is verbose) or this:

  gpointer gi = (gpointer) (EMACS_INTPTR) i;

(which misses some silly mistakes) we can write this:

  gpointer gi = (gpointer) to_EMACS_INTPTR (i);

(which has neither problem).