Modern::Perl(3p)

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

VERSION
version 1.20250607

SYNOPSIS
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 (but is unlikely to include non-core features).

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.

  CLI Usage
As of Modern::Perl 2019, you may also enable this pragma from the command line:

    $ perl -Modern::Perl -e 'say "Take that, awk!"'

You may also enable year-specific features:

    $ perl -Modern::Perl=2020 -e 'say "Looking forward to Perl 5.30!"'

  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, and:

    use Modern::Perl '2018';

... enables 5.26 features, and:

    use Modern::Perl '2019';

... enables 5.28 features, and:

    use Modern::Perl '2020';

... enables 5.30 features, and:

    use Modern::Perl '2021';

... enables 5.32 features, and:

    use Modern::Perl '2022';

... enables 5.34 features, and:

    use Modern::Perl '2023';

... enables 5.36 features, and:

    use Modern::Perl '2024';

... enables 5.38 features, and:

    use Modern::Perl '2025';

... enables 5.40 features.

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

As of Perl 5.38, you may prefer to write "use v5.38", which is almost entirely equivalent to the use of this module. For the purpose of forward compatibility, this module will continue to work as expected--and will continue regular maintenance.

As of Perl 5.41.4, "given" is no longer available, so any import tags for older versions of Perl will not enable this feature, no matter how much you try.

AUTHOR
chromatic, "<chromatic at wgz.org>"

BUGS
None known.

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.

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

    perldoc Modern::Perl

You can also look for information at:

•   RT: CPAN's request tracker

    <http://rt.cpan.org/NoAuth/Bugs.html?Dist=Modern-Perl>

•   AnnoCPAN: Annotated CPAN documentation

    <http://annocpan.org/dist/Modern-Perl>

•   CPAN Ratings

    <http://cpanratings.perl.org/d/Modern-Perl>

•   Search CPAN

    <http://search.cpan.org/dist/Modern-Perl/>

ACKNOWLEDGEMENTS
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, Norbert E. Grüner, and Slaven Rezic for reporting bugs, filing patches, and requesting features.

AUTHOR
chromatic

COPYRIGHT AND LICENSE
This software is copyright (c) 2025 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.