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package Bio::Phylo::Util::IDPool;
use strict;
{
    my @reclaim;
    my $obj_counter = 1;
    sub _initialize {
        my $obj_ID = 0;
        if ( @reclaim ) {
            $obj_ID = shift( @reclaim );
        }
        else {
            $obj_ID = $obj_counter;
            $obj_counter++;
        }
        return \$obj_ID;
    }
    sub _reclaim {
        my ( $class, $obj ) = @_;
        push @reclaim, $obj->get_id;
    }
}
1;
__END__
HideShow 26 lines of Pod
=head1 NAME
Bio::Phylo::Util::IDPool - Utility class for generating object IDs. No serviceable parts inside.
=head1 DESCRIPTION
This package defines utility functions for generating and reclaiming object
IDs. These functions are called by object constructors and destructors,
respectively. There is no direct usage.
=head1 SEE ALSO
=over
=item L<Bio::Phylo::Manual>
Also see the manual: L<Bio::Phylo::Manual> and L<http://rutgervos.blogspot.com>.
=back
=head1 REVISION
 $Id: IDPool.pm 604 2008-09-05 17:32:28Z rvos $
=cut