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Perl Module Devel::Cycle
========================

This module can be used to find memory cycles in objects and other
references.  Here is the synopsis:

  #!/usr/bin/perl
  use Devel::Cycle;

  # create an object that has four cycles
  my $test = {fred   => [qw(a b c d e)],
	    ethel  => [qw(1 2 3 4 5)],
	    george => {martha => 23,
		       agnes  => 19}
	   };
  # cycle 1
  $test->{george}{phyllis} = $test;
  # cycle 2
  $test->{fred}[3]      = $test->{george};
  # cycles 3 and 4
  $test->{george}{mary} = $test->{fred};
  find_cycle($test);
  exit 0;

  # output of the script:

 Cycle (1):
 	HASH(0x8171d30)->{george} => HASH(0x8171d00)
	HASH(0x8171d00)->{phyllis} => HASH(0x8171d30)

 Cycle (2):
	HASH(0x8171d30)->{george} => HASH(0x8171d00)
	HASH(0x8171d00)->{mary} => ARRAY(0x814be60)
	ARRAY(0x814be60)->[3] => HASH(0x8171d00)

 Cycle (3):
	HASH(0x8171d30)->{fred} => ARRAY(0x814be60)
	ARRAY(0x814be60)->[3] => HASH(0x8171d00)
	HASH(0x8171d00)->{phyllis} => HASH(0x8171d30)

 Cycle (4):
	HASH(0x8171d30)->{fred} => ARRAY(0x814be60)
	ARRAY(0x814be60)->[3] => HASH(0x8171d00)
	HASH(0x8171d00)->{mary} => ARRAY(0x814be60)


INSTALLATION

To install this module type the following:

   perl Makefile.PL
   make
   make test
   make install

DEVELOPING

The master repository for Devel::Cycle is kept on GitHub at
https://github.com/lstein/Devel-Cycle. Please contribute by sending
pull requests.

COPYRIGHT AND LICENCE

Copyright (C) 2003-2014 by Lincoln Stein <lincoln.stein@gmail.com>

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself, either Perl version 5.8.2 or,
at your option, any later version of Perl 5 you may have available.