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  no warnings 'uninitialized';
  $s->_hash ne $s->{__signature};
}# end is_changed()


sub reset
{
  my $s = shift;
  
  delete($s->{$_}) for grep { $_ ne 'SessionID' } keys %$s;
  $s->save;
  return;
}# end reset()


sub DESTROY
{
  my $s = shift;
  
  return undef(%$s) unless $s->{SessionID};
  
  unless( $s->is_read_only )
  {
    $s->save;# if $s->is_changed;
  }# end unless()
  undef(%$s);
}# end DESTROY()

1;# return true:

=pod

=head1 NAME

ASP4::SessionStateManager - Per-user state persistence

=head1 SYNOPSIS

  You've seen this page <%= $Session->{counter}++ %> times before.

=head1 DESCRIPTION

Web applications require session state management - and the simpler, the better.

C<ASP4::SessionStateManager> is a simple blessed hash.  When it goes out of scope,
it is saved to the database (or whatever).

If no changes were made to the session, it is not saved.

=head1 PUBLIC PROPERTIES

=head2 is_read_only( 1:0 )

Starting with version 1.044, setting this property to a true value will prevent
any changes made to the contents of the session during the current request from
being saved at the end of the request.

B<NOTE:> A side-effect is that calling C<< $Session->save() >> after calling C<< $Session->is_read_only(1) >>
will B<*NOT*> prevent changes from being saved B<ON PURPOSE>.  Explicitly calling C<< $Session->save() >>
will still cause the session data to be stored.  Setting C<< $Session->is_read_only(1) >> will only
prevent the default behavior of saving session state at the end of each successful request.

=head1 PUBLIC METHODS

=head2 save( )

Causes the session data to be saved. (Unless C<< $Session->is_read_only(1) >> is set.)

=head2 reset( )

Causes the session data to be emptied.

=head1 BUGS

It's possible that some bugs have found their way into this release.

Use RT L<http://rt.cpan.org/NoAuth/Bugs.html?Dist=ASP4> to submit bug reports.

=head1 HOMEPAGE

Please visit the ASP4 homepage at L<http://0x31337.org/code/> to see examples
of ASP4 in action.

=cut