Howdy,

While playing around with HTML::Template, I found a nice behavior, which is problably documentented, but I haven't found it.
If you run this code

# the template is just <TMPL_VAR NAME="hallo">

use HTML::Template;
use strict;
my $t=new HTML::Template( filename => "/tmp/tmpl");
print "3 ".time()."\n";
$t->param( "hallo" => \&littletest );
sleep 3;
print "2 ".time()."\n";
sleep 3;
print $t->output;
 
sub littletest {
        print "1 ".time()."\n";
        return "test";
        }
[download]

it prints out:

3 1019119182
2 1019119185
1 1019119188
test
[download]

But if you change the referenced sub to just the sub (delete the \), it prints out:

3 1019119294
1 1019119294
2 1019119297
test
[download]

Cool he

This allows you to setup parameters which will be evaluated at print time instead of assignment time.
If this isn't a new feature, well than I am just proud to have found a documented feature myself :-)
---------------------------
Dr. Mark Ceulemans
Senior Consultant
IT Masters, Belgium