Marcel Grünauer > callee-1.100820 > callee

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Module Version: 1.100820   Source  

NAME ^

callee - support recursive anonymous functions

VERSION ^

version 1.100820

SYNOPSIS ^

    use callee;

    my $f = sub {
        my $x = shift;
        return 1 if $x <= 1;
        $x * callee->($x-1);
    }->(5);

    # $f is 120

DESCRIPTION ^

This module exports one function, callee(), which allows anonymous functions to refer to themselves. This is necessary for recursive anonymous functions.

A recursive function must be able to refer to itself. Typically, a function refers to itself by its name. However, an anonymous function does not have a name, and if there is no accessible variable referring to it, i.e. the function is not assigned to any variable, the function cannot refer to itself. This is where callee comes in.

This module is just very thin syntactic sugar for Devel::Caller.

FUNCTIONS ^

callee

Returns a coderef to the function within which it is called.

SEE ALSO ^

Takesako-san wrote arguments.pm - see http://svn.coderepos.org/share/lang/perl/arguments/trunk/ - which does practically the same thing; see also his blog entry (in Japanese): http://d.hatena.ne.jp/TAKESAKO/20080501/1209637452.

I released this module because arguments.pm is not on CPAN, and because Devel::Caller already existed on CPAN, but not with the syntax I wanted.

INSTALLATION ^

See perlmodinstall for information and options on installing Perl modules.

BUGS AND LIMITATIONS ^

No bugs have been reported.

Please report any bugs or feature requests through the web interface at http://rt.cpan.org/Public/Dist/Display.html?Name=callee.

AVAILABILITY ^

The latest version of this module is available from the Comprehensive Perl Archive Network (CPAN). Visit http://www.perl.com/CPAN/ to find a CPAN site near you, or see http://search.cpan.org/dist/callee/.

The development version lives at http://github.com/hanekomu/callee/. Instead of sending patches, please fork this project using the standard git and github infrastructure.

AUTHOR ^

  Marcel Gruenauer <marcel@cpan.org>

COPYRIGHT AND LICENSE ^

This software is copyright (c) 2009 by Marcel Gruenauer.

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

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