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Modern::Perl - enable all of the features of Modern Perl with one import


version 1.20170115


Modern Perl programs use several modules to enable additional features of Perl and of the CPAN. Instead of copying and pasting all of these use lines, instead write only one:

    use Modern::Perl;

This enables the strict and warnings pragmas, as well as all of the features available in Perl 5.10. It also enables C3 method resolution order as documented in perldoc mro and loads IO::File and IO::Handle so that you may call methods on filehandles. In the future, it may include additional core modules and pragmas.

Because so much of this module's behavior uses lexically scoped pragmas, you may disable these pragmas within an inner scope with:

    no Modern::Perl;

See http://www.modernperlbooks.com/mt/2009/01/toward-a-modernperl.html for more information, http://www.modernperlbooks.com/ for further discussion of Modern Perl and its implications, and http://onyxneon.com/books/modern_perl/index.html for a freely-downloadable Modern Perl tutorial.

Wrapping Modern::Perl

If you want to wrap Modern::Perl in your own import() method, you can do so to add additional pragmas or features, such as the use of Try::Tiny. Please note that, if you do so, you will not automatically enable C3 method resolution in the calling scope. This is due to how the mro pragma works. In your custom import() method, you will need to write code such as:

    mro::set_mro( scalar caller(), 'c3' );

Forward Compatibility

For forward compatibility, I recommend you specify a string containing a year value as the single optional import tag. For example:

    use Modern::Perl '2009';
    use Modern::Perl '2010';

... both enable 5.10 features, while:

    use Modern::Perl '2011';

... enables 5.12 features:

    use Modern::Perl '2012';

... enables 5.14 features:

    use Modern::Perl '2013';

... enables 5.16 features, and:

    use Modern::Perl '2014';

... enables 5.18 features, and:

    use Modern::Perl '2015';

... enables 5.20 features, and:

    use Modern::Perl '2016';

... enables 5.24 features, and:

    use Modern::Perl '2017';

... enables 5.24 features.

Obviously you cannot use newer features on earlier versions. Perl will throw the appropriate exception if you try.


chromatic, <chromatic at wgz.org>


None reported.

Please report any bugs or feature requests to bug-modern-perl at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Modern-Perl. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.


You can find documentation for this module with the perldoc command.

    perldoc Modern::Perl

You can also look for information at:


Damian Conway (inspiration from Toolkit), Florian Ragwitz (B::Hooks::Parser, so I didn't have to write it myself), chocolateboy (for suggesting that I don't even need B::Hooks::Parser), Damien Learns Perl, David Moreno, Evan Carroll, Elliot Shank, Andreas König, Father Chrysostomos, Gryphon Shafer, and Norbert E. Grüner for reporting bugs, filing patches, and requesting features.


Copyright 2009-2017 chromatic, all rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl 5.24 itself.




This software is copyright (c) 2016 by chromatic@wgz.org.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.