self.pm provides $self and @args for your Perl OO modules, so you don't need to say: my $self = shift; And this is no source filter. INSTALLATION To install this module, run the following commands: perl Makefile.PL make make test make install COPYRIGHT AND LICENCE Copyright (C) 2021 Kang-min Liu This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.