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Sort::Key::Register(3pm)				User Contributed Perl Documentation				  Sort::Key::Register(3pm)

NAME
       Sort::Key::Register - tell Sort::Key how to sort new data types.

SYNOPSYS
	 use Sort::Key::Register Person =>
	     sub { $_->surname, $_->name },
	     qw(string string);

	 use Sort::Key::Register 'Color::Component' => 'integer';

	 use Sort::Key::Register Color =>
	     sub { $_->R, $_->G, $_->B },
	     ('Color::Component') x 3;

DESCRIPTION
       Sort::Key::Register allows one to register new data types with Sort::Key so that they can be sorted as natively supported ones.

       It works as a pragma module and doesn't export any function, all its functionality is provided via "use":

	 use Sort::Key::Register ...

       To avoid collisions between modules registering types with the same name, you should qualify them with the package name.

	 use Sort::Key::Register 'MyPkg::foo' => sub { $_ }, '-int';

	 # or using __PACKAGE__:
	 use Sort::Key::Register __PACKAGE__, sub { $_ }, '-int';

   USAGE
       use Sort::Key::Register $name => &multikeygen, @keytypes;
	   registers type $name.

	   &multikeygen is the multikey extraction function for the type and @keytypes are the types of the extracted keys.

       use Sort::Key::Register $name => $keytype;
	   this 'use' is useful for simple types that are sorted as another type already registered, maybe changing the direction of the sort
	   (ascending or descending).

SEE ALSO
       Sort::Key, Sort::Key::Maker.

AUTHOR
       Salvador Fandin~o, <sfandino@yahoo.com>

COPYRIGHT AND LICENSE
       Copyright (C) 2005 by Salvador Fandin~o

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.4 or,
       at your option, any later version of Perl 5 you may have available.

perl v5.14.2							    2012-06-30						  Sort::Key::Register(3pm)