Re: PL/Perl list value return causes segfault

On Tue, Jul 12, 2005 at 03:45:55PM -0400, Andrew Dunstan wrote:
>
>
> Alvaro Herrera wrote:
>
> >On Tue, Jul 12, 2005 at 02:59:37PM -0400, Andrew Dunstan wrote:
> >
> >
> >
> >>Note that all plperl functions are called in scalar context, and
> >>it is always wrong to return a list (as opposed to a listref). In
> >>fact, the value received might surprise you even if it worked (it
> >>would be the value of the last member of the list).
> >
> >Hmm, I don't know if it's feasible to do in Perl, but maybe check
> >whether the function wants to return something in list context and
> >throw an appropiate error message?
>
> In perl, if there is any ambiguity it is the called function that is
> responsible for checking, not the caller. See "perldoc -f
> wantarray". PLPerl explicitly passed G_SCALAR as a flag on all
> calls to plperl routines. So returning a list is a case of pilot
> error.

Is this a kind of pilot error that documents could help avert in some
useful way?

Cheers,
D
--
David Fetter david(at)fetter(dot)org http://fetter.org/
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