Well, if I had to remove the goto, I would rewrite it as:
{
eval {
tie %session, 'Apache::Session::MySQL', $session, {
Handle => HH::DB->db_Main, LockHandle => HH::DB->db_Main
}
};
if ($@) {
if ($@ =~ /^Object does not exist/) {
$session = undef;
redo;
} else {
print $cgi->header;
die_nice('Database Error', 'Unable to connect at this time
+');
}
}
}
But a
redo (just like
next and
last
is just a glorified
goto. People who just balk at any sight
of a
goto have at best heard about Dijkstra's article
Go To Considered Harmful (which wasn't titles bij Dijkstra, but
by Hoare), but never read the paper, or not understood it. Dijkstra just
warns that
goto can easily lead to unstructured programs,
he doesn't say it's evil all the time.
Knuth has also written about this subject, in his Structured Programming
with the Go To statement. His view is less far away from Dijkstra as
that the titles suggest.
Abigail
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