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Postings from May 2004
On Thu, May 27, 2004 at 12:45:02AM -0700, Stas Bekman wrote:
> So how do I check in C whether the passed variable (or a random sv) is
> undef or not if comparing to &PL_sv_undef doesn't work? am I missing some
> obvious RTFM section? I've read: 'perlguts:=head2 AVs, HVs and undefined
> values'
> but it doesn't seem to be related. There were many other references to
> undef in the perl manpages, but I didn't find anything useful.
From perldoc perlguts:
If you want to know if this variable (or any other SV) is
actually "defined", you can call:
SvOK(SV*)
I've always used this, but the documentation in perlapi:
SvOK Returns a boolean indicating whether the value is
an SV.
bool SvOK(SV* sv)
doesn't really lead you to it.
--
Tony
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