Re: How do I determine the argument type...

[Kevin Ryde]

Bruce Korb <address@hidden> writes:
>
> A macro cannot hide the problem.  You cannot set it back to int without
> breaking everyone who adapted to size_t.

I was thinking of something like,

#define gh_scm2newstr(str,lenp) \
  gh_scm2newstr_helper (str, lenp, sizeof (*lenp))

Not sure if all compilers will enjoy "sizeof(*NULL)" though.

Another way would be the following, though it unfortunately evaluates
the parameters more than once.  In gcc that could be avoided,
probably.

#define gh_scm2newstr(str,lenp) \
  ((lenp) ? *(lenp) = gh_scmstrlen (str) : 0,  \
   gh_scm2newstr_helper (str))

> "Oops.

I guess insofar as it's contrary to the docs it's an oops.

> use this configury macro to specify the type passed to
> gh_scm2newstr()."

Probably as simple as an AC_TRY_COMPILE (or AC_COMPILE_IFELSE, or
whatever it's called these days).