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Vincent Pit


indirect - Lexically warn about using the indirect object syntax.


Version 0.09_01


    no indirect;
    my $x = new Apple 1, 2, 3; # warns
     use indirect;
     my $y = new Pear; # ok
    no indirect ':fatal';
    if (defied $foo) { ... } # croaks, note the typo


When enabled (or disabled as some may prefer to say, since you actually turn it on by calling no indirect), this pragma warns about indirect object syntax constructs that may have slipped into your code. This syntax is now considered harmful, since its parsing has many quirks and its use is error prone (when sub isn't defined, sub $x is actually interpreted as $x->sub).

It currently does not warn when the object is enclosed between braces (like meth { $obj } @args) or for core functions (print or say). This may change in the future, or may be added as optional features that would be enabled by passing options to unimport.

This module is not a source filter.


unimport @opts

Magically called when no indirect @opts is encountered. Turns the module on. If @opts contains ':fatal', the module will croak on the first indirect syntax met.


Magically called at each use indirect. Turns the module off.


perl 5.8.

XSLoader (standard since perl 5.006).


meth $obj (no semicolon) at the end of a file won't be seen as an indirect object syntax, although it will as soon as there is another token before the end (as in meth $obj; or meth $obj 1).

With 5.8 perls, the pragma does not propagate into eval STRING. This is due to a shortcoming in the way perl handles the hints hash, which is addressed in perl 5.10.


Vincent Pit, <perl at profvince.com>, http://www.profvince.com.

You can contact me by mail or on irc.perl.org (vincent).


Please report any bugs or feature requests to bug-indirect at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=indirect. 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 indirect

Tests code coverage report is available at http://www.profvince.com/perl/cover/indirect.


Bram, for motivation and advices.


Copyright 2008 Vincent Pit, all rights reserved.

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