[Xapian-discuss] Perl XS bindings, postlist_begin

[Francis Irving]

On Fri, May 28, 2004 at 08:37:48AM +0100, Francis Irving wrote:
> On Fri, May 28, 2004 at 01:20:31AM +0100, Olly Betts wrote:
> > But it looks like postlist_begin() isn't wrapped yet.  Since
> > PostingIterator is now wrapped (as of 0.8.0.2) that's easy - patch
> > attached.  I've not tested this beyond it compiling, but it's pretty
> > trivial (famous last words...)
> 
> Fab.  The patch applies, gives fewer warnings, and installs...  But I
> still can't call the function on a Database.
> 
>     my $db=Search::Xapian::WritableDatabase->new($dbfile, Search::Xapian::DB_CREATE_OR_OPEN);
>     my $post = $db->postlist_begin("ethiopia");
> 
> Can't locate auto/Search/Xapian/WritableDatabase/postlist_be.al in
> @INC 

To add to this, the problem seems to be casting to a Database.  The
function doesn't appear in WritableDatabase.  I can't work out how
to cast them, so for now I'm opening a second handle.  And this runs
OK:

    my $dbr=Search::Xapian::Database->new($dbfile);

    my $post = $dbr->postlist_begin("ethiopia");
    my $postend = $dbr->postlist_end("ethiopia");

Unfortunately when I try to compare the two values:

    while ($post != $postend)
    {
        print "p is $post\n";
        $post++;
    }

I get a "14061 Segmentation fault".  This happens in the !=
operator, and only when comparing to $postend.  This line
runs fine, comparing it to itself as a test:

    while ($post != $post)

Francis