use strict;
use warnings;
no warnings 'recursion';
use Pod::Usage;
use English qw( -no_match_vars );
use Getopt::Long qw(:config no_ignore_case no_auto_abbrev pass_through
+);

$OUTPUT_AUTOFLUSH = 1;

####################################################################
##                             OPTIONS
####################################################################

GetOptions(
  "help|h!"         => \my $help,
  )
  or pod2usage(verbose => 0,exitstatus => 1);

if ($help)
{
  pod2usage(verbose => 2,exitstatus => 0);
  exit;
}

####################################################################
##                               MAIN
####################################################################

my @array = (1 .. 150);

my $array_size = size_of_an_array(@array);

print "Size of this array is $array_size\n";

exit;

####################################################################
##                               SUBS
####################################################################

sub size_of_an_array {

  my(@array) = @_;

  if (not @array) {
        
    return 0;

  } else {

    pop @array;

    return (1 + size_of_an_array(@array));

  }

}

[download]

This code works ok because I removed recursion warning (line on top of the code). If I allow recursion warning and my array is (1 .. 98) I get no warnings. If my array is larger I get Deep recursion on subroutine "main::size_of_an_array" at ./recursive_array_ex11.8.pl line 91.. On the net I found it has something to do with perl's depth limit being 100, and that there is a $DB:deep variable that allows you to change this depth. But I can't figure how it works, could you help me solve this problem (I'd like to have a very large array, use this recursive subroutine, and get no warnings)

In reply to Deep recursion problem by etheral

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