Number of Elements in HoL

Tuna has asked for the wisdom of the Perl Monks concerning the following question:

Monks, this is frustrating. Why doesnt the following work? I get an undefined variable returned.

in getClusterHostCount$VAR1 = '/saconfig/current/cluster1';
$VAR2 = [
          'localhost',
          'eh050su2'
        ];

sub getClusterHostCount {
  print "******************entering getclusterhost count\n";
 my  $hostcount =  ( @{$ClusterHostList{ $clusterID }} ) ;
print "count = $hostcount\n";
print "in getClusterHostCount", Dumper (%ClusterHostList);
return $hostcount;
}
[download]

Comment on Number of Elements in HoL Download Code

Replies are listed 'Best First'.
Re: Number of Elements in HoL by perrin (Chancellor) on Aug 22, 2001 at 17:58 UTC
It looks like you're putting that array ref in list context when you want scalar context. Try this: `my $hostcount = scalar(@{$ClusterHostList{ $clusterID }});` [download] Technically, I don't think you need that "scalar()", but it's good documentation of what you're doing.	[reply] [d/l]
Re: Number of Elements in HoL by MZSanford (Curate) on Aug 22, 2001 at 17:51 UTC
I don't see $clusterID getting set, if that is not just acopy/paste error, i think thats the cause ... i used the folowing for a test : `$ClusterHostList{'/saconfig/current/cluster1'} = ['localhost','eh050su +2']; &getClusterHostCount('/saconfig/current/cluster1'); sub getClusterHostCount { print "****************entering getclusterhost count\n"; my $clusterID = shift; my $hostcount = scalar @{ $ClusterHostList{$clusterID} } ; print "count = $hostcount\n"; return $hostcount; }` [download] .. and suvery says ... `**************entering getclusterhost count count = 2` [download] Update :** /me being stupid. It was set (thanks Tuna), so my other fix (`scalar`) was what did it. _{can't sleep clowns will eat me} -- MZSanford	[reply] [d/l] [select]


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