Sort::Key::Types(3) User Contributed Perl Documentation Sort::Key::Types(3) 

use Sort::Key::Types qw(register_type);
register_type(Color => sub { $_->R, $_->G, $_->B }, qw(int, int, int));
# you better
# use Sort::Key::Register ...

The Sort::Key family of modules can be extended to support new key types using this module (or the more friendly Sort::Key::Register).

The following functions are provided:

registers a new datatype named $name defining how to convert it to a multi-key.

&gensubkeys should convert the object of type $name passed on $_ to a list of values composing the multi-key.

@subkeystypes is the list of types for the generated multi-keys.

For instance:

Sort::Key::Types::register_type
               'Person',
               sub { $_->surname,
                     $_->name,
                     $_->middlename },
               qw(str str str);
Sort::Key::Types::register_type
               'Color',
               sub { $_->R, $_->G, $_->B },
               qw(int int int);

Once a datatype has been registered it can be used in the same way as types supported natively, even for defining new types, i.e.:

Sort::Key::Types::register_type
               'Family',
               sub { $_->father, $_->mother },
               qw(Person Person);

Sort::Key, Sort::Key::Merger, Sort::Key::Register.

Copyright (C) 2005-2007, 2014 by Salvador Fandiño, <sfandino@yahoo.com>.

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.

2023-07-25 perl v5.38.0