Sort::Key::Register − tell Sort::Key how to sort new data types.
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;
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';
use Sort::Key::Register $name => \&multikeygen, @keytypes;
registers type $name.
&multikeygen is the multi-key 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).
Sort::Key, Sort::Key::Maker.
Salvador Fandiño, <[email protected]>
Copyright (C) 2005, 2014 by Salvador Fandiño
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.