1Sort::Key::Maker(3)   User Contributed Perl Documentation  Sort::Key::Maker(3)
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NAME

6       Sort::Key::Maker - multi-key sorter creator
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SYNOPSIS

9         # create a function that sorts strings by length:
10         use Sort::Key::Maker sort_by_length => sub { length $_},  qw(integer);
11
12         # create a multi-key sort function;
13         # first key is integer sorted in descending order,
14         # second key is a string in default (ascending) order:
15         use Sort::Key::Maker ri_s_keysort => qw(-integer string);
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17         # some sample data...
18         my @foo = qw(foo bar t too tood mama);
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20         # and now, use the sorter functions previously made:
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22         # get the values on @foo sorted by length:
23         my @sorted = sort_by_length @foo;
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25         # sort @foo inplace by its length and then by its value:
26         ri_s_keysort_inplace { length $_, $_ } @foo;
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DESCRIPTION

29       Sort::Key::Maker is a pragmatic module that provides an easy to use
30       interface to Sort::Key multi-key sorting functionality.
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32       It creates multi-key sorting functions on the fly for any key type
33       combination and exports them to the caller package.
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35       The key types natively accepted are:
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37         string, str, locale, loc, integer, int,
38         unsigned_integer, uint, number, num
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40       and support for other types can be added via Sort::Key::Register (or
41       also via Sort::Key::register_type()).
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43   USAGE
44       use Sort::Key::Maker foo_sort => @keys;
45           exports two subroutines to the caller package: "foo_sort (&@)" and
46           "foo_sort_inplace (&\@)".
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48           Those two subroutines require a sub reference as their first
49           argument and then respectively, the list to be sorted or an array.
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51           For instance:
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53             use Sort::Key::Maker bar_sort => qw(int int str);
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55             @bar=qw(doo tomo 45s tio);
56             @sorted = bar_sort { unpack "CCs", $_ } @bar;
57             # or sorting @bar inplace
58             bar_sort_inplace { unpack "CCs", $_ } @bar;
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60       use Sort::Key::Maker foo_sort => \&genmultikey, @keys;
61           when the first argument after the sorter name is a reference to a
62           subroutine it is used as the multi-key extraction function. The
63           generated sorter functions doesn't require neither accept one,
64           i.e.:
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66             use Sort::Key::Maker sort_by_length => sub { length $_ }, 'int';
67             my @sorted = sort_by_length qw(foo goo h mama picasso);
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SEE ALSO

70       Sort::Key, Sort::Key::Register.
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72       Sort::Maker also available from CPAN provides similar functionality.
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AUTHOR

75       Salvador Fandiño, <sfandino@yahoo.com>
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78       Copyright (C) 2005, 2014 by Salvador Fandiño
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80       This library is free software; you can redistribute it and/or modify it
81       under the same terms as Perl itself, either Perl version 5.8.4 or, at
82       your option, any later version of Perl 5 you may have available.
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86perl v5.28.0                      2014-04-29               Sort::Key::Maker(3)
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